I&#39;m trying to follow data-binding example from official google doc https://developer.android.com/tools/data-binding/guide.html

except that I&#39;m trying to apply data-biding to a fragment, not an activity.

the error I&#39;m currently getting when compiling is 

`Error:(37, 27) No resource type specified (at &#39;text&#39; with value &#39;@{marsdata.martianSols}.`

`onCreate` for fragment looks like this:

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MartianDataBinding binding = MartianDataBinding.inflate(getActivity().getLayoutInflater());
        binding.setMarsdata(this);
    }

`onCreateView` for fragment looks like this:

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.martian_data, container, false);
    }

and parts of my layout file for fragment looks like this:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;data&gt;
            &lt;variable
                name=&quot;marsdata&quot;
                type=&quot;uk.co.darkruby.app.myapp.MarsDataProvider&quot; /&gt;
        &lt;/data&gt;
    ...
    
            &lt;TextView
                android:layout_height=&quot;wrap_content&quot;
                android:layout_width=&quot;wrap_content&quot;
                android:text=&quot;@{marsdata.martianSols}&quot;
            /&gt;

        &lt;/RelativeLayout&gt;
    &lt;/layout&gt;

my suspicion is that `MartianDataBinding` doesn&#39;t know which layout file it&#39;s supposed to be bound with - hence the error. Any suggestions?


How to use data-binding with Fragment

Gets following warning when building the project

    DSL element &#39;android.dataBinding.enabled&#39; is obsolete and has been replaced with &#39;android.buildFeatures.dataBinding&#39;.

I am using `Android Studio Canary 6`

DSL element &#39;android.dataBinding.enabled&#39; is obsolete and has been replaced with &#39;android.buildFeatures.dataBinding&#39;

I  have a TextView which has a hardcoded string and I have a dynamic variable that I want to put at the end of this string. This is my code:

  
    &lt;LinearLayout
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:orientation=&quot;vertical&quot;
        android:layout_marginLeft=&quot;16dp&quot;
        android:layout_marginRight=&quot;16dp&quot;&gt;
        &lt;TextView
            android:id=&quot;@+id/PeopleName&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;match_parent&quot;
            android:text=&quot;@string/Generic_Text&quot;+&quot;@{ Profile.name }&quot; /&gt;
    
    
    &lt;/LinearLayout&gt;

I am having an issue with  `android:text=&quot;@string/Generic_Text&quot;+&quot;@{ Profile.name }&quot;` . The `Generic_Text` states &quot; My Name is &quot; then the `Profile.name` is dynamic and obviously changes from profile to profile. I want it so that the whole TextView output is **My Name is {Profile.name}**. Any help would be great.

How do I use databinding to combine a string from resources with a dynamic variable in XML?

Update note:
------------

The above example **works properly**, because release 1.0-rc4 **fixed** the issue of needing the unnecessary variable.



Original question:
------------------

I do exactly as it is described in the [documentation][1] and it does not work:


**main.xml:**

    &lt;layout xmlns:andr...
        &lt;data&gt;
        &lt;/data&gt;
           &lt;include layout=&quot;@layout/buttons&quot;&gt;&lt;/include&gt;
    ....
**buttons.xml:**

    &lt;layout xmlns:andr...&gt;
        &lt;data&gt;
        &lt;/data&gt;
        &lt;Button
            android:id=&quot;@+id/button&quot;
            ....&quot; /&gt;
**MyActivity.java:**

     ... binding = DataBindingUtil.inflate...
    binding.button; -&gt;cannot resolve symbol &#39;button&#39;


how to get button?


  [1]: https://developer.android.com/topic/libraries/data-binding/index.html#includes

Android Data Binding using include tag

I have following fragment class written in Java using the new databinding library

    import com.example.app.databinding.FragmentDataBdinding;
    
    public class DataFragment extends Fragment {

        @Nullable
        private FragmentDataBinding mBinding;

        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            mBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_data, container, false);
            return mBinding.getRoot();
        }
    }

It compiles and runs fine.  
I tried to rewrite it in Kotlin and came up with the following:

    import com.example.app.databinding.FragmentDataBdinding

    class ProfileFragment : Fragment() {
    
        private var mBinding: FragmentDataBinding? = null

        override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
            mBinding = DataBindingUtil.inflate(inflater, R.layout.fragment_data, container, false)
            return mBinding!!.getRoot()
        }
    }

But now step `:app:compileDebugKotlin` outputs the following:

&gt; Error:(16, 38) Unresolved reference: databinding  
&gt; Error:(37, 27) Unresolved reference: FragmentDataBinding

How can I use android-databinding library with Kotlin?

My top-level `build.gradle`:

    buildscript {
        repositories {
            jcenter()
        }
        dependencies {
            classpath &#39;com.android.tools.build:gradle:1.3.0&#39;
            classpath &#39;com.android.databinding:dataBinder:1.0-rc4&#39;
        }
    }

    allprojects {
        repositories {
            jcenter()
        }
    }

My `build.gradle` in app dir (only relevant parts):

    apply plugin: &#39;com.android.application&#39;
    apply plugin: &#39;com.android.databinding&#39;
    apply plugin: &#39;kotlin-android&#39;

    dependencies {
        compile &quot;org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version&quot;
    }

    buildscript {
        ext.kotlin_version = &#39;0.14.451&#39;
        repositories {
            mavenCentral()
        }

        dependencies {
            classpath &quot;org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version&quot;
            classpath &quot;org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version&quot;
        }
    }
    repositories {
        mavenCentral()
        maven {
            url &#39;http://oss.sonatype.org/content/repositories/snapshots&#39;
        }
    }

I&#39;m using Android Studio 1.4, Build tools version 23.0.1, Android SDK 23, SDK tools 24.4.0

Kotlin-android: unresolved reference databinding

I am trying to use the and &quot;&amp;&amp;&quot; operator in xml using Android databinding, 

`android:visibility=&quot;@{(bean.currentSpaceId == bean.selectedSpaceId **&amp;&amp;** bean.currentSpaceId &gt; 0)? View.VISIBLE: View.GONE}&quot;`

but I got the compilation error:

&gt; Error:Execution failed for task &#39;:app:dataBindingProcessLayoutsDevDebug&#39;.
&gt; org.xml.sax.SAXParseException; systemId: file:/Users/path/app/build/intermediates/res/merged/dev/debug/layout/fragment_space.xml; lineNumber: 106; columnNumber: 89; The entity name must immediately follow the &#39;&amp;&#39; in the entity reference.

and red highlight error in android studio &quot;unescaped &amp; or non terminated character&quot;.

So how should I fix this?

**Edit:**
found the answer, these character needs to be escaped:

    &#39;&amp;&#39; --&gt; &#39;&amp;amp;&#39;
    
    &#39;&lt;&#39; --&gt; &#39;&amp;lt;&#39;
    
    &#39;&gt;&#39; --&gt; &#39;&amp;gt;&#39;



android databinding using &quot;&amp;&amp;&quot; logical operator

Trying to set visibility of `View` using custom variable, but error occurs: `Identifiers must have user defined types from the XML file. visible is missing it`. Is it possible to set view visibility using data binding? Thanks.

    &lt;data&gt;
        &lt;variable
            name=&quot;sale&quot;
            type=&quot;java.lang.Boolean&quot;/&gt;
    &lt;/data&gt;

    &lt;FrameLayout android:visibility=&quot;@{sale ? visible : gone}&quot;/&gt;

Use data binding to set View visibility

I am using Data Binding in my project, when using `&lt;layout&gt;` and `&lt;data&gt;` in my xml binding class is not generated.

For example i have activity_main.xml 

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;data&gt;    &lt;/data&gt;
        &lt;RelativeLayout
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;match_parent&quot;&gt;
        &lt;/RelativeLayout&gt;
    &lt;/layout&gt;

Now if i am writing `ActivityMainBinding` in my activity/fragment it shows error that class is not available. But after including `&lt;variable&gt;` in my xml file, it is able to generate `ActivityMainBinding` class.


Android Studio : **2.1.3**&lt;br&gt;
Classpath : **com.android.tools.build:gradle:2.1.3**&lt;br&gt;
minSdkVersion **16**&lt;br&gt;
targetSdkVersion **24**&lt;br&gt;
buildToolsVersion **24.0.0**


Data Binding class not generated

Im using `DataBinding` Api for setting the views in android layouts. Here is my layout.

layout.xml

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
     &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
      &lt;data&gt;
        &lt;variable name=&quot;user&quot; type=&quot;testing.sampleapp.com.sampleapp.User&quot;/&gt;
      &lt;/data&gt;
    &lt;LinearLayout
        android:orientation=&quot;vertical&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;&gt;
        &lt;TextView android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:text=&quot;@{ &quot;Hello &quot; + user.firstName}&quot;/&gt;
    &lt;/LinearLayout&gt;
&lt;/layout&gt;

 I want the TextView to display **Hello UserName**. How to achieve this using the data binding api.

I want to concat two strings for a TextView in android, Data Binding Api

**I&#39;m trying to set drawable resource ID to android:src of ImageView using data binding**

Here is my object:

    public class Recipe implements Parcelable {
        public final int imageResource; // resource ID (e.g. R.drawable.some_image)
        public final String title;
        // ...

        public Recipe(int imageResource, String title /* ... */) {
            this.imageResource = imageResource;
            this.title = title;
        }

        // ...
    }

Here is my layout:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;&gt;

        &lt;data&gt;
            &lt;variable
                name=&quot;recipe&quot;
                type=&quot;com.example.android.fivewaystocookeggs.Recipe&quot; /&gt;
        &lt;/data&gt;

        &lt;!-- ... --&gt;

        &lt;ImageView
            android:id=&quot;@+id/recipe_image_view&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;200dp&quot;
            android:scaleType=&quot;centerCrop&quot;
            android:src=&quot;@{recipe.imageResource}&quot; /&gt;

        &lt;!-- ... --&gt;

    &lt;/layout&gt;

And finally, activity class:

    // ...

    public class RecipeActivity extends AppCompatActivity {

        public static final String RECIPE_PARCELABLE = &quot;recipe_parcelable&quot;;
        private Recipe mRecipe;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            mRecipe = getIntent().getParcelableExtra(RECIPE_PARCELABLE);
            ActivityRecipeBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_recipe);
            binding.setRecipe(mRecipe);
        }

        // ...

    }

It doesn&#39;t display image at all. What am I doing wrong?

BTW, it was perfectly working with standard way:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recipe);

        final ImageView recipeImageView = (ImageView) findViewById(R.id.recipe_image_view);
        recipeImageView.setImageResource(mRecipe.imageResource);

    }


Set drawable resource ID in android:src for ImageView using data binding in Android

I just started to use Android Studio 3.0.0, but every time I try to build my project I get this error:

    Error:Circular dependency between the following tasks:
    :app:compileDebugKotlin
    +--- :app:dataBindingExportBuildInfoDebug
    |    \--- :app:compileDebugKotlin (*)
    \--- :app:kaptDebugKotlin
         \--- :app:dataBindingExportBuildInfoDebug (*)
    (*) - details omitted (listed previously)

I am using 

    kapt &quot;com.android.databinding:compiler:2.2.0&quot;

Before I was using 

    androidProcessor &quot;com.android.databinding:compiler:2.2.0&quot;

And it was working just fine... What I am doing wrong??

Thanks!


How to use Data Binding and Kotlin in Android Studio 3.0.0

We are using [DataBinding][1] since Jetpack release. Android documentation indicates that [ViewBinding][2] was added in **Android Studio 3.6 Canary 11+.**

I read the documentation but its looks similar to **DataBinding.**

Can anyone explain what&#39;s the difference between these two concepts?


  [1]: https://developer.android.com/topic/libraries/data-binding
  [2]: https://developer.android.com/topic/libraries/view-binding

Android : Difference between DataBinding and ViewBinding

I just created a new project on Android Studio 3.2 Canary 16 with Kotlin enabled. Then I also enabled data binding, but I&#39;m getting an error saying that it could not find the DataBindingComponent class.

Here&#39;s my project gradle:

    // Top-level build file where you can add configuration options common to all sub-projects/modules.
    
    buildscript {
        ext.kotlin_version = &#39;1.2.41&#39;
        ext.android_plugin_version = &#39;3.2.0-alpha10&#39;
        repositories {
            google()
            jcenter()
        }
        dependencies {
            classpath &#39;com.android.tools.build:gradle:3.2.0-alpha16&#39;
            classpath &quot;org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version&quot;
    
            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }
    
    allprojects {
        repositories {
            google()
            jcenter()
        }
    }
    
    task clean(type: Delete) {
        delete rootProject.buildDir
    }


My module gradle file:

    apply plugin: &#39;com.android.application&#39;
    
    apply plugin: &#39;kotlin-android&#39;
    
    apply plugin: &#39;kotlin-kapt&#39;
    
    apply plugin: &#39;kotlin-android-extensions&#39;
    
    android {
        compileSdkVersion 27
        defaultConfig {
            applicationId &quot;net.julianonunes.myapp&quot;
            minSdkVersion 22
            targetSdkVersion 27
            versionCode 1
            versionName &quot;1.0&quot;
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.pro&#39;
            }
        }
        dataBinding {
            enabled = true
        }
    }
    
    dependencies {
        implementation fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
        implementation&quot;org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version&quot;
        implementation &#39;com.android.support:appcompat-v7:27.1.1&#39;
        implementation &#39;com.android.support.constraint:constraint-layout:1.1.0&#39;
        implementation &#39;com.squareup.okhttp3:okhttp:3.10.0&#39;
        implementation &#39;com.android.support:design:27.1.1&#39;
        kapt &quot;com.android.databinding:compiler:3.1.2&quot;
    }


My activity&#39;s xml:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        xmlns:tools=&quot;http://schemas.android.com/tools&quot;&gt;
    
        &lt;data&gt;
            &lt;variable
                name=&quot;data&quot;
                type=&quot;net.julianonunes.myapp.RegisterData&quot; /&gt;
        &lt;/data&gt;
    
        ....
    &lt;/layout&gt;

And here&#39;s the build output:

    Executing tasks: [clean, :app:assembleDebug]
    
    Configuration on demand is an incubating feature.
    
    &gt; Configure project :app
    app: &#39;annotationProcessor&#39; dependencies won&#39;t be recognized as kapt annotation processors. Please change the configuration name to &#39;kapt&#39; for these artifacts: &#39;androidx.databinding:databinding-compiler:3.2.0-alpha16&#39;.
    
    &gt; Task :clean
    &gt; Task :app:clean
    &gt; Task :app:preBuild UP-TO-DATE
    &gt; Task :app:preDebugBuild
    &gt; Task :app:compileDebugAidl NO-SOURCE
    &gt; Task :app:compileDebugRenderscript
    &gt; Task :app:checkDebugManifest
    &gt; Task :app:generateDebugBuildConfig
    &gt; Task :app:prepareLintJar UP-TO-DATE
    &gt; Task :app:mainApkListPersistenceDebug
    &gt; Task :app:generateDebugResValues
    &gt; Task :app:generateDebugResources
    &gt; Task :app:mergeDebugResources
    &gt; Task :app:createDebugCompatibleScreenManifests
    &gt; Task :app:processDebugManifest
    &gt; Task :app:splitsDiscoveryTaskDebug
    &gt; Task :app:processDebugResources
    &gt; Task :app:generateDebugSources
    &gt; Task :app:dataBindingExportBuildInfoDebug
    &gt; Task :app:transformDataBindingBaseClassLogWithDataBindingMergeGenClassesForDebug
    &gt; Task :app:transformDataBindingWithDataBindingMergeArtifactsForDebug
    &gt; Task :app:dataBindingGenBaseClassesDebug
    Download https://dl.google.com/dl/android/maven2/com/android/databinding/compiler/3.1.2/compiler-3.1.2.pom
    Download https://dl.google.com/dl/android/maven2/com/android/databinding/compiler/3.1.2/compiler-3.1.2.jar
    &gt; Task :app:kaptGenerateStubsDebugKotlin
    e: /home/juliano/Documents/Projetos/myapp/app/build/generated/data_binding_base_class_source_out/debug/dataBindingGenBaseClassesDebug/out/net/julianonunes/myapp/databinding/ActivityMainBinding.java:28: error: cannot find symbol
      protected ActivityMainBinding(DataBindingComponent _bindingComponent, View _root,
                                    ^
      symbol:   class DataBindingComponent
      location: class ActivityMainBinding
    e: /home/juliano/Documents/Projetos/myapp/app/build/generated/data_binding_base_class_source_out/debug/dataBindingGenBaseClassesDebug/out/net/julianonunes/myapp/databinding/ActivityMainBinding.java:46: error: cannot find symbol
          @Nullable ViewGroup root, boolean attachToRoot, @Nullable DataBindingComponent component) {
                                                                    ^
      symbol:   class DataBindingComponent
      location: class ActivityMainBinding
    e: /home/juliano/Documents/Projetos/myapp/app/build/generated/data_binding_base_class_source_out/debug/dataBindingGenBaseClassesDebug/out/net/julianonunes/myapp/databinding/ActivityMainBinding.java:57: error: cannot find symbol
          @Nullable DataBindingComponent component) {
                    ^
      symbol:   class DataBindingComponent
      location: class ActivityMainBinding
    e: /home/juliano/Documents/Projetos/myapp/app/build/generated/data_binding_base_class_source_out/debug/dataBindingGenBaseClassesDebug/out/net/julianonunes/myapp/databinding/ActivityMainBinding.java:68: error: cannot find symbol
          @Nullable DataBindingComponent component) {
                    ^
      symbol:   class DataBindingComponent
      location: class ActivityMainBinding
    e: [kapt] An exception occurred: java.lang.NullPointerException
    	at java.io.File.&lt;init&gt;(File.java:277)
    	at android.databinding.annotationprocessor.ProcessExpressions.onHandleStep(ProcessExpressions.java:77)
    	at android.databinding.annotationprocessor.ProcessDataBinding$ProcessingStep.runStep(ProcessDataBinding.java:203)
    	at android.databinding.annotationprocessor.ProcessDataBinding$ProcessingStep.access$000(ProcessDataBinding.java:188)
    	at android.databinding.annotationprocessor.ProcessDataBinding.doProcess(ProcessDataBinding.java:90)
    	at android.databinding.annotationprocessor.ProcessDataBinding.process(ProcessDataBinding.java:65)
    	at org.jetbrains.kotlin.kapt3.ProcessorWrapper.process(annotationProcessing.kt:131)
    	at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794)
    	at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705)
    	at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91)
    	at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035)
    	at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176)
    	at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
    	at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1068)
    	at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:87)
    	at org.jetbrains.kotlin.kapt3.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:45)
    	at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.runAnnotationProcessing(Kapt3Extension.kt:257)
    	at org.jetbrains.kotlin.kapt3.AbstractKapt3Extension.analysisCompleted(Kapt3Extension.kt:212)
    	at org.jetbrains.kotlin.kapt3.ClasspathBasedKapt3Extension.analysisCompleted(Kapt3Extension.kt:95)
    	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM$analyzeFilesWithJavaIntegration$2.invoke(TopDownAnalyzerFacadeForJVM.kt:97)
    	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration(TopDownAnalyzerFacadeForJVM.kt:107)
    	at org.jetbrains.kotlin.cli.jvm.compiler.TopDownAnalyzerFacadeForJVM.analyzeFilesWithJavaIntegration$default(TopDownAnalyzerFacadeForJVM.kt:84)
    	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:374)
    	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler$analyze$1.invoke(KotlinToJVMBytecodeCompiler.kt:64)
    	at org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport.analyzeAndReport(AnalyzerWithCompilerReport.kt:101)
    	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.analyze(KotlinToJVMBytecodeCompiler.kt:365)
    	at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules$cli(KotlinToJVMBytecodeCompiler.kt:130)
    	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:161)
    	at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:63)
    	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:107)
    	at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:51)
    	at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:96)
    	at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$1$2.invoke(CompileServiceImpl.kt:405)
    	at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$1$2.invoke(CompileServiceImpl.kt:98)
    	at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:920)
    	at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:98)
    	at org.jetbrains.kotlin.daemon.common.DummyProfiler.withMeasure(PerfUtils.kt:137)
    	at org.jetbrains.kotlin.daemon.CompileServiceImpl.checkedCompile(CompileServiceImpl.kt:950)
    	at org.jetbrains.kotlin.daemon.CompileServiceImpl.doCompile(CompileServiceImpl.kt:919)
    	at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:404)
    	at sun.reflect.GeneratedMethodAccessor91.invoke(Unknown Source)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:498)
    	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346)
    	at sun.rmi.transport.Transport$1.run(Transport.java:200)
    	at sun.rmi.transport.Transport$1.run(Transport.java:197)
    	at java.security.AccessController.doPrivileged(Native Method)
    	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
    	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
    	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
    	at java.security.AccessController.doPrivileged(Native Method)
    	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    	at java.lang.Thread.run(Thread.java:745)
    
    &gt; Task :app:kaptDebugKotlin FAILED
    
    FAILURE: Build failed with an exception.
    
    * What went wrong:
    Execution failed for task &#39;:app:kaptDebugKotlin&#39;.
    &gt; Compilation error. See log for more details
    
    * Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
    
    * Get more help at https://help.gradle.org
    
    Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
    See https://docs.gradle.org/4.7/userguide/command_line_interface.html#sec:command_line_warnings
    
    BUILD FAILED in 8s
    20 actionable tasks: 19 executed, 1 up-to-date


What is wrong with my project?


PS: The problem also happens on Android Studio 3.1.2

Cannot find symbol DataBindingComponent on Android Studio 3.2 Canary 16 Kotlin project

I am getting started for using `DataBinding` feature. I am facing problem with it.

&gt; Error:(21, 9) error: cannot find symbol class
&gt; ContactListActivityBinding

**build.gradle(Module: app)**

    apply plugin: &#39;com.android.application&#39;
    
    android {
        compileSdkVersion 23
        buildToolsVersion &quot;23.0.2&quot;
    
        defaultConfig {
            applicationId &quot;com.letsnurture.ln_202.databindingdemo&quot;
            minSdkVersion 15
            targetSdkVersion 23
            versionCode 1
            versionName &quot;1.0&quot;
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.pro&#39;
            }
        }
        dataBinding {
            enabled = true
        }
    }
    
    dependencies {
        compile fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
        testCompile &#39;junit:junit:4.12&#39;
        compile &#39;com.android.support:appcompat-v7:23.1.1&#39;
        compile &#39;com.android.support:design:23.1.1&#39;
    }

**ContactListActivity.java**

    import android.databinding.DataBindingUtil;
    import android.os.Bundle;
    import android.support.design.widget.FloatingActionButton;
    import android.support.design.widget.Snackbar;
    import android.support.v7.app.AppCompatActivity;
    import android.support.v7.widget.Toolbar;
    import android.view.View;
    import android.view.Menu;
    import android.view.MenuItem;
    
    import com.letsnurture.ln_202.databindingdemo.model.Contact;
    
    public class ContactListActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            ContactListActivityBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_contact_list);
            Contact user = new Contact(&quot;Chintan Soni&quot;, &quot;+91 9876543210&quot;);
            binding.setContact(user);
    
    //        setContentView(R.layout.activity_contact_list);
            Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
            setSupportActionBar(toolbar);
    
            FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
            fab.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Snackbar.make(view, &quot;Replace with your own action&quot;, Snackbar.LENGTH_LONG)
                            .setAction(&quot;Action&quot;, null).show();
                }
            });
        }
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.menu_contact_list, menu);
            return true;
        }
    
        @Override
        public boolean onOptionsItemSelected(MenuItem item) {
            // Handle action bar item clicks here. The action bar will
            // automatically handle clicks on the Home/Up button, so long
            // as you specify a parent activity in AndroidManifest.xml.
            int id = item.getItemId();
    
            //noinspection SimplifiableIfStatement
            if (id == R.id.action_settings) {
                return true;
            }
    
            return super.onOptionsItemSelected(item);
        }
    }

**content_contact_list.xml**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        xmlns:tools=&quot;http://schemas.android.com/tools&quot;
        tools:context=&quot;com.letsnurture.ln_202.databindingdemo.ContactListActivity&quot;
        tools:showIn=&quot;@layout/activity_contact_list&quot;&gt;
    
        &lt;data&gt;
    
            &lt;variable
                name=&quot;user&quot;
                type=&quot;com.letsnurture.ln_202.databindingdemo.model.Contact&quot; /&gt;
        &lt;/data&gt;
    
        &lt;LinearLayout
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;match_parent&quot;
            android:orientation=&quot;vertical&quot;
            android:padding=&quot;@dimen/activity_horizontal_margin&quot;
            app:layout_behavior=&quot;@string/appbar_scrolling_view_behavior&quot;&gt;
    
            &lt;TextView
                android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:text=&quot;@{user.contactName}&quot;
                tools:text=&quot;Name&quot; /&gt;
    
            &lt;TextView
                android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:text=&quot;@{user.contactNumber}&quot;
                tools:text=&quot;Number&quot; /&gt;
        &lt;/LinearLayout&gt;
    &lt;/layout&gt;

**activity_contact_list.xml**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;android.support.design.widget.CoordinatorLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;
        xmlns:tools=&quot;http://schemas.android.com/tools&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;
        android:fitsSystemWindows=&quot;true&quot;
        tools:context=&quot;com.letsnurture.ln_202.databindingdemo.ContactListActivity&quot;&gt;
    
        &lt;android.support.design.widget.AppBarLayout
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:theme=&quot;@style/AppTheme.AppBarOverlay&quot;&gt;
    
            &lt;android.support.v7.widget.Toolbar
                android:id=&quot;@+id/toolbar&quot;
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;?attr/actionBarSize&quot;
                android:background=&quot;?attr/colorPrimary&quot;
                app:popupTheme=&quot;@style/AppTheme.PopupOverlay&quot; /&gt;
    
        &lt;/android.support.design.widget.AppBarLayout&gt;
    
        &lt;include layout=&quot;@layout/content_contact_list&quot; /&gt;
    
        &lt;android.support.design.widget.FloatingActionButton
            android:id=&quot;@+id/fab&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_gravity=&quot;bottom|end&quot;
            android:layout_margin=&quot;@dimen/fab_margin&quot;
            android:src=&quot;@android:drawable/ic_dialog_email&quot; /&gt;
    
    &lt;/android.support.design.widget.CoordinatorLayout&gt;



android: data binding error: cannot find symbol class

How can we use data binding in android to put image resource in an `ImageView`? 

   

      &lt;ImageView
                android:id=&quot;@+id/is_synced&quot;
                android:src=&quot;@{model.pending ? @mipmap/pending: @mipmap/synced}&quot;
                android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot; /&gt;

I want an image if pending is true and another image if pending is false. But it&#39;s showing error.How can I achieve this functionality?

How to set Image resource to ImageView using DataBinding

I am currently using `databinding` and `MVVM architecture` for android. What would be the best way to get string resources in ViewModel. 

**I am not using the new `AndroidViewModel` component, `eventbus` or `RxJava`**

I was going through the aproach of interfaces where Activity will be responsible for providing resources. But recently I found a similar question with [this][1] answer where a single class using application context is providing all resources. 

Which would be the better approach? or is there something else that I can try?


  [1]: https://stackoverflow.com/a/46667358/3543940

How should I get Resources(R.string) in viewModel in Android (MVVM and databinding)

Both of my colleague and I have experience in MVVM of Web App, while we are new to native android development. Now we have contrary opinions about android data-binding -- I&#39;m a fan of it while he is not.

My Arguments:

* Reduces boilerplate code which in turns brings
    * Less coupling
    * Stronger readability
* Powerful, easy to implement custom attribute and custom view
* Even faster than findViewById ([details](https://stackoverflow.com/questions/34712820/android-data-binding-vs-findviewbyid-for-performance))

His Arguments:

* The auto-generated .class increases app size.
* Harder to debug

I&#39;ve made some investigation but there are not many discussions about it. Now I want to collect the pros and cons of android data-binding.

Aspects of discussion include but are not limited to:

* unit test
* app size
* performance
* learning curve
* readability
* coupling

What are the pros and cons of android data-binding?

I am having trouble in implementing databinding in a Dialog. Is it possible?

Below is my xml.

&lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;

    &lt;data&gt;

        &lt;variable
            name=&quot;olaBooking&quot;
            type=&quot;com.example.myapp.viewmodels.ViewModel&quot; /&gt;
    &lt;/data&gt;

    &lt;LinearLayout
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;&gt;

        &lt;android.support.v7.widget.CardView
            android:id=&quot;@+id/cv&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_margin=&quot;15dp&quot;
            android:elevation=&quot;4dp&quot;
            android:padding=&quot;15dp&quot;&gt;

            &lt;LinearLayout
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:orientation=&quot;vertical&quot;&gt;

                &lt;TextView
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:background=&quot;@color/colorPrimary&quot;
                    android:gravity=&quot;center&quot;
                    android:padding=&quot;15dp&quot;
                    android:text=&quot;OLA Cab Booked !&quot;
                    android:textAppearance=&quot;@style/TextAppearance.AppCompat.Body1&quot; /&gt;

                &lt;View
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;2dp&quot;
                    android:background=&quot;@color/colorPrimaryDark&quot; /&gt;

                &lt;TextView
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:gravity=&quot;start|center&quot;
                    android:padding=&quot;15dp&quot;
                    android:text=&quot;Car Details&quot; /&gt;

                &lt;View
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;2dp&quot;
                    android:background=&quot;@color/colorPrimaryDark&quot; /&gt;

                &lt;TextView
                    android:id=&quot;@+id/driverName&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:padding=&quot;5dp&quot;
                    android:text=&quot;@{olaBooking.driverName}&quot; /&gt;

                &lt;TextView
                    android:id=&quot;@+id/carModel&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:padding=&quot;5dp&quot;
                    android:text=&quot;@{olaBooking.getCarName}&quot; /&gt;

                &lt;TextView
                    android:id=&quot;@+id/carNo&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:padding=&quot;5dp&quot;
                    android:text=&quot;@{olaBooking.getCabNo}&quot; /&gt;

                &lt;TextView
                    android:id=&quot;@+id/eta&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:padding=&quot;5dp&quot;
                    android:text=&quot;@{olaBooking.getEta}&quot; /&gt;
            &lt;/LinearLayout&gt;
        &lt;/android.support.v7.widget.CardView&gt;
    &lt;/LinearLayout&gt;
&lt;/layout&gt;

I want to bind the above layout in a Dialog. How is it possible? Below is my java code i tried but it&#39;s not working 

            dialog.setContentView(R.layout.dialog_ola_booking_confirmed);
        DialogOlaBookingConfirmedBinding binding = DataBindingUtil.inflate(
                LayoutInflater.from(dialog.getContext()),
                R.layout.dialog_ola_booking_confirmed,
                (ViewGroup) dialog.findViewById(R.id.cv),
                false);
        ViewModel viewModel = new ViewModel(this, event.olaBooking);

How to use data-binding in Dialog?

Ran into a mysterious problem when trying to make a @BindingConversion for int to string.  
The following code **works for floats to strings**:

xml:

    ...
    &lt;variable
            name=&quot;myViewModel&quot;
            type=&quot;... .SomeModel&quot; /&gt;
    ...
    &lt;TextView
                style=&quot;@style/StyleStuff&quot;
                android:text=&quot;@{myViewModel.number}&quot; /&gt;

code:

    public class SomeModel {
        public ObservableFloat number = new ObservableFloat();
    }

and setting:

    viewModel.number.set(3.14f);


---
But if I try the same thing for **ints to strings** I get a crash.

     public ObservableInt number = new ObservableInt();

with

    viewModel.number.set(42);

I get the following:

    FATAL EXCEPTION: main
    Process: ...myapplication, PID: 14311
    android.content.res.Resources$NotFoundException: String resource ID #0xfa0
        at android.content.res.Resources.getText(Resources.java:1123)
        at android.support.v7.widget.ResourcesWrapper.getText(ResourcesWrapper.java:52)
        at android.widget.TextView.setText(TextView.java:4816)
        at ...executeBindings(ActivityAdaptersBinding.java:336)
        at android.databinding.ViewDataBinding.executePendingBindings(ViewDataBinding.java:355)

---
Any ideas?
Thanks!

Android Data Binding @BindingConversion failure for int to string

I am trying to set custom attribute using the [Android DataBinding Library](https://developer.android.com/topic/libraries/data-binding/index.html)
in my Kotlin project like this:

### Layout

    &lt;ImageView
    	android:id=&quot;@+id/imgView”
    	android:layout_width=&quot;40dp&quot;
    	android:layout_height=&quot;40dp&quot;
    	android:layout_gravity=&quot;center&quot;
    	android:adjustViewBounds=&quot;true&quot;
    	app:imageUrl=&quot;@{segment.url}&quot;/&gt;
    							

### Code

    class Utils {
        companion object {
            @BindingAdapter(&quot;bind:imageUrl&quot;)
        	@JvmStatic
        	fun loadImage(view: ImageView, url:String) 
        	{Picasso.with(view.context).load(url).error(R.drawable.error).into(view)}
        }
    }

		

		

The runtime error I get is:

&gt; A BindingAdapter in in &lt;package.Utils.Companion&gt; is not static and requires an object to use, retrieved from the DataBindingComponent. If you don&#39;t use an inflation method taking a DataBindingComponent, use DataBindingUtil.setDefaultComponent or make all BindingAdapter methods static.

Any pointers to solve it?

This happens only for custom attributes. The rest of the databindings work fine					 



Kotlin custom attribute databinding

I followed the data binding documentation for **Custom Binding Adapter** for **image loading** from official Android Developers site:
http://developer.android.com/tools/data-binding/guide.html

After successfully compiling the code I get a warning which is:

    Warning:Application namespace for attribute bind:imageUrl will be ignored.
    
My Code is as follow:

    @BindingAdapter({&quot;bind:imageUrl&quot;})
        public static void loadImage(final ImageView imageView, String url) {
            imageView.setImageResource(R.drawable.ic_launcher);
            AppController.getUniversalImageLoaderInstance().displayImage(url, imageView);
        }
    
**Why this warning is generated?**

A screenshot is also attached...[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/tt5Fk.png

Android DataBinding Custom Binding Adapter Warning

As per http://developer.android.com/tools/data-binding/guide.html#imports, we can have such simple expressions in visibility:

    &lt;TextView
    ..
    android:visibility=&quot;@{user.isAdult ? View.VISIBLE : View.GONE}&quot;/&gt;

But when I try to do the same in an `include` tag, like so:

    &lt;include
    android:id=&quot;@+id/image_layout&quot;
    layout=&quot;@layout/image_layout&quot;
    android:visibility=&quot;@{notification.notifType == 0 ? View.VISIBLE : View.GONE}&quot;/&gt;

Then Studio not only shows the expression in red, but upon building it gives the following error in the auto-generated binding class:

&gt; Error:(138, 29) error: cannot find symbol method setVisibility(int)

Here&#39;s where the error occurs in the auto-generated binding class

    // batch finished
    if ((dirtyFlags &amp; 0x3L) != 0) {
        // api target 1
        this.imageLayout.setVisibility(NotifTypeNotificatio1);
    }
    imageLayout.executePendingBindings();

Android Data Binding: visibility on include tag

I&#39;m using the new vector drawable support in Support Lib v23.2 with app:srcCompat &amp; trying to set its drawable via data binding.

    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;&gt;

    &lt;data&gt;
        &lt;variable
            name=&quot;mediaPojo&quot;
            type=&quot;in.ishaan.pika.data_binding.MediaPojo&quot;/&gt;
    &lt;/data&gt;

    &lt;RelativeLayout
        android:background=&quot;@color/black&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;&gt;

        &lt;VideoView
            ... /&gt;

        &lt;ImageView
            ...
            app:srcCompat=&quot;@{mediaPojo.isPlaying ? @drawable/ic_pause_24dp : @drawable/ic_play_arrow_24dp}&quot;
        /&gt;

        &lt;ProgressBar
            .../&gt;
    &lt;/RelativeLayout&gt;
    &lt;/layout&gt;

On trying to build, studio throws:

&gt; Error:(33, 30) Cannot find the setter for attribute &#39;app:srcCompat&#39; with parameter type android.graphics.drawable.Drawable.

Data Binding with srcCompat

While using data binding , I am not able to get class `MainActivityBinding`  as per [Data Binding Guide](https://developer.android.com/tools/data-binding/guide.html)

My layout name is `activity_main.xml`.
I am also see [Android - DataBinding - How and when the Binding classes will be generated?](https://stackoverflow.com/questions/31365692/android-databinding-how-and-when-the-binding-classes-will-be-generated) but it can&#39;t help me.

Can&#39;t resolve Android databinding class

I know that it is possible to reference resources in layout by their resource id:

    android:text=&quot;@{@string/resourceName}&quot;

However, I would like to reference resource by id which is known only at runtime. As a simple example, imagine we have such model:


    public class MyPOJO {

        public final int resourceId = R.string.helloWorld;

    }

And now I need to use this value as a value in a format string. Let&#39;s call it

    &lt;string name=&quot;myFormatString&quot;&gt;Value is: %s&lt;/string&gt;

The most straightforward approach does not work:

    android:text=&quot;@{@string/myFormatString(myPojo.resourceId)}&quot;

This will just put integer value into placeholder (also it proves that I initialized my POJO correctly, so I&#39;m not providing whole layout here).

I also tried using `@BindingConversion`, but it did not worked (which is actually expected, but I tried anyway) - `int` was still assigned to placeholder and binding method was not called.

How can I explicitly get resource by it&#39;s id in DataBinding library? 

DataBinding: How to get resource by dynamic id?

I would like to set background color or `null` on my view using DataBinding library but I get an exception trying to run it.

    java.lang.NullPointerException: Attempt to invoke virtual method &#39;int java.lang.Integer.intValue()&#39; on a null object reference

This is how I do it:

    android:background=&quot;@{article.sponsored ? @color/sponsored_article_background : null}&quot;

I also tried setting conversion but it didn&#39;t work.

    @BindingConversion
    public static ColorDrawable convertColorToDrawable(int color) {
       return new ColorDrawable(color);
    }

Eventually, I resolved it with workaround using `@BindingAdapter` but I would like to know how to do it properly.

Use DataBinding library to set background color resource or null

In [Yigit Boyar and George Mount&#39;s talk on Android Databinding](https://realm.io/news/data-binding-android-boyar-mount/) they illustrate how easy it is to bind to `TextWatcher`&#39;s `onTextChanged` (at 13:41). On a Button. Are their slides wrong? First of all the `Button` View doesn&#39;t have an `onTextChanged` property. It neither has a `setOnTextChanged` method. Neither does `EditText`. But they both have `addTextChangedListener` which takes a `TextWatcher` as input.

So what are they talking about? How do they do it? Their example code does not compile, but gives this error:

```none
Error:(17) No resource identifier found for attribute &#39;onTextChanged&#39; in package &#39;android&#39;
```

How do I bind to a &quot;Text Changed Event&quot; on any View, or EditText in particular, with the Android Databinding framework?

How to databind to onTextChanged for an EditText on Android?

I am using Android Studio 2.0 Preview 4.
I&#39;m using Android SDK tools 25 rc1. This error persists no matter how many times I clean / rebuild project. File-&gt;Invalidate Caches and restart also doesn&#39;t work.
I&#39;m not able to run the most basic example of data binding.

build.gradle file


    apply plugin: &#39;com.android.application&#39;
    
    android {
        compileSdkVersion 23
        buildToolsVersion &quot;23.0.2&quot;
    
        defaultConfig {
            applicationId &quot;com.example.chiragshenoy.myapplication&quot;
            minSdkVersion 15
            targetSdkVersion 23
            versionCode 1
            versionName &quot;1.0&quot;
        }
        buildTypes {
            release {
                minifyEnabled false
                proguardFiles getDefaultProguardFile(&#39;proguard-android.txt&#39;), &#39;proguard-rules.pro&#39;
            }
        }
    
        dataBinding {
            enabled = true
        }
    }
    
    dependencies {
        compile fileTree(dir: &#39;libs&#39;, include: [&#39;*.jar&#39;])
        testCompile &#39;junit:junit:4.12&#39;
        compile &#39;com.android.support:appcompat-v7:23.1.1&#39;
        compile &#39;com.android.support:design:23.1.1&#39;
    }

MainActivity.java

    package com.example.chiragshenoy.myapplication;
    
    import android.databinding.DataBindingUtil;
    import android.os.Bundle;
    import android.support.v7.app.AppCompatActivity;
    import android.view.Menu;
    import android.view.MenuItem;
    
    public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            MainActivity binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
            User user = new User(&quot;Test&quot;, &quot;User&quot;);
            binding.setUser(user);
        }
    
        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.menu_main, menu);
            return true;
        }

activity_main.xml

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;data&gt;
            &lt;variable name=&quot;user&quot; type=&quot;com.example.chiragshenoy.myapplication.User&quot;/&gt;
        &lt;/data&gt;
        &lt;LinearLayout
            android:orientation=&quot;vertical&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;match_parent&quot;&gt;
            &lt;TextView android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:text=&quot;@{user.firstName}&quot;/&gt;
            &lt;TextView android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:text=&quot;@{user.lastName}&quot;/&gt;
        &lt;/LinearLayout&gt;
    &lt;/layout&gt;

this is my top level build.gradle file

    // Top-level build file where you can add configuration options common to all sub-projects/modules.
    
    buildscript {
        repositories {
            jcenter()
        }
        dependencies {
            classpath &#39;com.android.tools.build:gradle:2.0.0-alpha3&#39;
    
            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }
    
    allprojects {
        repositories {
            jcenter()
        }
    }
    
    task clean(type: Delete) {
        delete rootProject.buildDir
    }




Data Binding Android - Type parameter T has incompatible upper bounds : ViewDataBinding and MainActivity

I&#39;m trying to bind events with views in xml using **DataBinding Library** shipped with Android M. I&#39;m following examples from [Android Developers][1] and implementing step-by-step. for the view&#39;s attributes like visibility,text its working fine but if I try to bind with onclick, it doesn&#39;t work as expected. Here&#39;s the sample code that I&#39;ve tried so far: 

     &lt;data&gt;
        &lt;import type=&quot;android.view.View&quot;/&gt;
        &lt;variable name=&quot;user&quot; type=&quot;com.example.databinding.User&quot;/&gt;
        &lt;variable name=&quot;handlers&quot; type=&quot;com.example.databinding.MyHandlers&quot;/&gt;
    &lt;/data&gt;

     &lt;TextView
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:text=&quot;@{user.firstName}&quot;
        android:visibility=&quot;@{user.isFriend ? View.VISIBLE : View.GONE}&quot; /&gt;
     &lt;Button
        android:layout_width=&quot;wrap_content&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:text=&quot;Click Me&quot;
        android:id=&quot;@+id/button&quot;
        android:layout_gravity=&quot;left&quot;
        android:onClick=&quot;@{handlers.onClickFriend}&quot;/&gt;

MainActivity :

      public class MainActivity extends AppCompatActivity {

      User user;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActivityMainBinding binding = 
        DataBindingUtil.setContentView(this,R.layout.activity_main);
        user = new User(&quot;Pankaj&quot;,&quot;Kumar&quot;,true,true);
        binding.setUser(user);
       }
     }

MyHandlers:

    public class MyHandlers {
    public void onClickFriend(View view){
        Log.i(MyHandlers.class.getSimpleName(),&quot;Now Friend&quot;);
    }

    public void onClickEnemy(View view){
        Log.i(MyHandlers.class.getSimpleName(),&quot;Now Enemy&quot;);
      }
    }

I&#39;ve written only required code to improve readability. Could someone help me on this.


  [1]: https://developer.android.com/tools/data-binding/guide.html

Using DataBinding library for binding events

Cannot understand... How to set some property of view only if variable field isn&#39;t null?
&lt;br&gt;For example

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
    
        &lt;data&gt;
            &lt;variable
                name=&quot;item&quot;
                type=&quot;com.test.app.Item&quot; /&gt;
        &lt;/data&gt;
    
        &lt;RelativeLayout
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;60dp&quot;
            android:orientation=&quot;horizontal&quot;&gt;
    
            &lt;ImageView
                android:id=&quot;@+id/icon&quot;
                android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:layout_alignParentLeft=&quot;true&quot;
                android:layout_alignParentStart=&quot;true&quot;
                android:layout_centerVertical=&quot;true&quot;
                android:layout_margin=&quot;16dp&quot;
                android:src=&quot;@{item.getDrawable()}&quot;/&gt;
    
            &lt;LinearLayout
                android:layout_width=&quot;match_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:layout_centerVertical=&quot;true&quot;
                android:layout_marginEnd=&quot;16dp&quot;
                android:layout_marginLeft=&quot;72dp&quot;
                android:layout_marginRight=&quot;16dp&quot;
                android:layout_marginStart=&quot;72dp&quot;
                android:layout_toLeftOf=&quot;@id/action&quot;
                android:layout_toStartOf=&quot;@id/action&quot;
                android:orientation=&quot;vertical&quot;&gt;
    
                &lt;TextView
                    android:id=&quot;@+id/text1&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:singleLine=&quot;true&quot;
                    android:textColor=&quot;@color/black_87&quot;
                    android:textSize=&quot;16sp&quot;
                    android:text=&quot;@{item.getTitle()}&quot;/&gt;
    
                &lt;TextView
                    android:id=&quot;@+id/text2&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:autoLink=&quot;web|email&quot;
                    android:linksClickable=&quot;false&quot;
                    android:singleLine=&quot;true&quot;
                    android:textColor=&quot;@color/black_54&quot;
                    android:textSize=&quot;14sp&quot;
                    android:text=&quot;@{item.getSubtitle()}&quot;/&gt;
    
    
            &lt;/LinearLayout&gt;
    
        &lt;/RelativeLayout&gt;
    &lt;/layout&gt;
Some field of Item can be null and I won&#39;t call methods of layout views unnecessarily. And I won&#39;t get `NullPointerException`. How can I set property only if it isn&#39;t null?
&lt;br&gt;P.S. Sorry for English.

Data binding: set property if it isn&#39;t null

While using the new data binding api, I found that you can&#39;t bind to the &quot;style&quot; attribute.  Compiler complains that it can&#39;t find the style. However, if I simply set the style as is, it&#39;ll find it just fine. For example:

**doesn&#39;t work:**

    style=&quot;@{TextUtils.isEmpty(row.getSubtitle()) ? @style/SubTitle : @style/Title}&quot;

**works:**

    style=&quot;@style/SubTitle&quot;


**Error:**

&gt;Error:Execution failed for task &#39;:app:compileDebugJavaWithJavac&#39;.
&gt;&gt; java.lang.RuntimeException: Found data binding errors.
  ****/ data binding error ****msg:Identifiers must have user defined types from the XML file. SubTitle is missing it file:/~/test/app/src/main/res/layout/row.xml loc:48:71 - 48:78 ****\ data binding error ****

Android + Data Binding @style

after i upgrade AS gradle version to 2.3.0,
data binding encounter a warning : 

&gt; Warning:selectMap[index] is a boxed field but needs to be un-boxed to execute selectMap[index] ? @android:color/white : @android:color/transparent. This may cause NPE so Data Binding will safely unbox it. You can change the expression and explicitly wrap selectMap[index] with safeUnbox() to prevent the warning

selectMap is an ObservableMap, then i search this warning but got just few discussions and did not fix it

[Android Studio 2.3.0-alpha1: Databinding + int unboxing causes compile errors][1]

[Databinding - data object is null on API 15-18][2]

I follow the way in the links, modify `selectMap[index]` to `safeUnbox(selectMap[index])` but got syntax error. 

So anyone know how to fix this warning?

-----------------------------------------------
Edit : 
Here is the xml file code

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
&lt;layout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    xmlns:tools=&quot;http://schemas.android.com/tools&quot;&gt;

    &lt;data class=&quot;SupportCountryViewHolderBinding&quot;&gt;

        &lt;variable
            name=&quot;viewModel&quot;
            type=&quot;com.goodarc.care_about.activity.account.support_country.SupportCountryHolderViewModel&quot; /&gt;

        &lt;variable
            name=&quot;dataSource&quot;
            type=&quot;com.goodarc.care_about.module.assets_file.SupportCountry&quot; /&gt;

        &lt;variable
            name=&quot;selectMap&quot;
            type=&quot;android.databinding.ObservableMap&amp;lt;Integer, Boolean&amp;gt;&quot; /&gt;

        &lt;variable
            name=&quot;index&quot;
            type=&quot;int&quot; /&gt;
    &lt;/data&gt;

    &lt;LinearLayout
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:background=&quot;@{selectMap[index] ? @android:color/white : @android:color/transparent}&quot;
        android:onClick=&quot;@{(v) -&gt; viewModel.onItemSelectListener(selectMap, index)}&quot;
        android:orientation=&quot;vertical&quot;
        android:padding=&quot;20dp&quot;&gt;

        &lt;TextView
            style=&quot;@style/TitleLabel2&quot;
            android:layout_gravity=&quot;center_vertical|start&quot;
            android:text=&quot;@{dataSource.display}&quot;
            android:textColor=&quot;@{selectMap[index] ? @android:color/black : @android:color/white}&quot;
            tools:text=&quot;Taiwan (+886)&quot; /&gt;
    &lt;/LinearLayout&gt;
&lt;/layout&gt;

Build is succeed, but warning come out(i past above).

  [1]: https://code.google.com/p/android/issues/detail?id=228345
  [2]: https://code.google.com/p/android/issues/detail?id=191841

data binding - safeUnbox warning

I have implemented the new Android data-binding, and after implementing realised that it does not support two-way binding. I have tried to solve this manually but I am struggling to find a good solution to use when binding to an EditText. 
In my layout I have this view:

    &lt;EditText
    android:id=&quot;@+id/firstname&quot;
    android:layout_width=&quot;match_parent&quot;
    android:layout_height=&quot;wrap_content&quot;
    android:inputType=&quot;textCapWords|textNoSuggestions&quot;
    android:text=&quot;@{statement.firstName}&quot;/&gt;

Another view is also showing the results:
              
    &lt;TextView
    style=&quot;@style/Text.Large&quot;
    android:layout_width=&quot;wrap_content&quot;
    android:layout_height=&quot;wrap_content&quot;
    android:text=&quot;@{statement.firstName}&quot;/&gt;

In my fragment I create the binding like this: 

    FragmentStatementPersonaliaBinding binding = DataBindingUtil.inflate(inflater, R.layout.fragment_statement_personalia, container, false);
    binding.setStatement(mCurrentStatement);

This works and puts the current value of firstName in the EditText. The problem is how to update the model when the text changes. I tried putting an OnTextChanged-listener on the editText and updating the model. This created a loop killing my app (model-update updates the GUI, which calls textChanged times infinity). Next I tried to only notify when real changes occured like this: 

    @Bindable
    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
            boolean changed = !TextUtils.equals(this.firstName, firstName);
            this.firstName = firstName;
            if(changed) {
                notifyPropertyChanged(BR.firstName);
            }
        }

This worked better, but everytime I write a letter, the GUI is updated and for som reason the edit-cursor is moved to the front. 

Any suggestions would be welcome

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