Since the version *22.1.0*, the class `ActionBarActivity` is deprecated. You should use `AppCompatActivity`.

Read [here][1] and [here][2] for more information.


  [1]: http://developer.android.com/tools/support-library/index.html
  [2]: http://android-developers.blogspot.com/2015/04/android-support-library-221.html

According to this [video][1] of Android Developers you should only make two changes

![enter image description here][2]



  [1]: https://www.youtube.com/watch?t=49&amp;v=5Be2mJzP-Uw
  [2]: http://i.stack.imgur.com/IH2AO.png


android developers documentation says : &quot;Updated the AppCompatActivity as the base class for activities that use the support library action bar features. This class replaces the deprecated ActionBarActivity.&quot;

checkout [changes for Android Support Library, revision 22.1.0 (April 2015)][1]


  [1]: http://developer.android.com/tools/support-library/index.html

When trying to reference a managed bean in EL like so `#{bean.entity.property}`, sometimes a `javax.el.PropertyNotFoundException: Target Unreachable` exception is being thrown, usually when a bean property is to be set, or when a bean action is to be invoked.

There seem to be five different kinds of messages:

1. [Target Unreachable, identifier &#39;bean&#39; resolved to null][1]
2. [Target Unreachable, &#39;entity&#39; returned null][2]
3. [Target Unreachable, &#39;null&#39; returned null][3]
3. [Target Unreachable, &#39;&#39;0&#39;&#39; returned null][4]
5. [Target Unreachable, &#39;BracketSuffix&#39; returned null][5]

What do they all mean? How are they caused and how should they be solved?


  [1]: https://stackoverflow.com/search?q=is%3Aquestion%20javax.el.PropertyNotFoundException%20%22Target%20Unreachable%22%20%22resolved%20to%20null%22
  [2]: https://stackoverflow.com/search?q=is%3Aquestion%20javax.el.PropertyNotFoundException%20%22Target%20Unreachable%22%20%22returned%20null%22%20-%22%27null%27%20returned%22%20-%22%270%27%20returned%22%20-BracketSuffix
  [3]: https://stackoverflow.com/search?q=is%3Aquestion%20javax.el.PropertyNotFoundException%20%22Target%20Unreachable%22%20%22%27null%27%20returned%20null%22
  [4]: https://stackoverflow.com/search?q=is%3Aquestion%20javax.el.PropertyNotFoundException%20%22Target%20Unreachable%22%20%22%27%270%27%27%20returned%20null%22
  [5]: https://stackoverflow.com/search?q=is%3Aquestion%20javax.el.PropertyNotFoundException%20%22Target%20Unreachable%22%20%22%27BracketSuffix%27%20returned%20null%22

Identifying and solving javax.el.PropertyNotFoundException: Target Unreachable

I am trying to find the best way to remove an element from an array in the state of a component.  Since I should not modify the `this.state` variable directly, is there a better way (more concise) to remove an element from an array than what I have here?:

      onRemovePerson: function(index) {
        this.setState(prevState =&gt; { // pass callback in setState to avoid race condition
          let newData = prevState.data.slice() //copy array from prevState
          newData.splice(index, 1) // remove element
          return {data: newData} // update state
        })
      },

Thank you.

**updated**

This has been updated to use the callback in setState. This should be done when referencing the current state while updating it.

Removing element from array in component state

Actually there is no problem. Project compiles and runs. But I can&#39;t understand what is mean strikeout class name (Android Studio tells that there is deprecated code is used)![enter image description here][1]. Can anybody explain? 


  [1]: http://i.stack.imgur.com/eIqgy.png

ActionBarActivity is deprecated

<p>Actually there is no problem. Project compiles and runs. But I can't understand what is mean strikeout class name (Android Studio tells that there is deprecated code is used)<img src="http://i.stack.imgur.com/eIqgy.png" alt="enter image description here">. Can anybody explain?</p>


I&#39;ve done a few researches on this topic and I couldn&#39;t find a complete solution  so, step by step and with some trial and error, I finally find out how can we achieve these results: having a transparent or coloured `Actionbar` and `Statusbar`. See my answer bellow.

Android transparent status bar and actionbar

I am trying to run the following code in android

    URLConnection l_connection = null;
			// Create connection
			uzip=new UnZipData(mContext);
			l_url = new URL(serverurl);
			
			if (&quot;https&quot;.equals(l_url.getProtocol())) {
				System.out.println(&quot;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt; Before TLS &gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&quot;);
				sslcontext = SSLContext.getInstance(&quot;TLS&quot;);
				System.out.println(&quot;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt; After TLS &gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&quot;);
				sslcontext.init(null,
						new TrustManager[] { new CustomTrustManager()},
						new java.security.SecureRandom());
				HttpsURLConnection
						.setDefaultHostnameVerifier(new CustomHostnameVerifier());
				HttpsURLConnection.setDefaultSSLSocketFactory(sslcontext
						.getSocketFactory());
				
				l_connection = (HttpsURLConnection) l_url.openConnection();
				((HttpsURLConnection) l_connection).setRequestMethod(&quot;POST&quot;);
			} else {
				l_connection = (HttpURLConnection) l_url.openConnection();
				((HttpURLConnection) l_connection).setRequestMethod(&quot;POST&quot;);
			}
			/*System.setProperty(&quot;http.agent&quot;, &quot;Android_Phone&quot;);*/
			
			
			l_connection.setConnectTimeout(10000);
			l_connection.setRequestProperty(&quot;Content-Language&quot;, &quot;en-US&quot;);
			l_connection.setUseCaches(false);
			l_connection.setDoInput(true);
			l_connection.setDoOutput(true);
			System.out.println(&quot;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt; Before Connection &gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&gt;&quot;);
			l_connection.connect();

On `l_connection.connect()` , it is giving this SSLhandshakeException. Sometimes it works, but most of the time it gives the exception. It is only happening on Android 4.0 emulator. I tested it on Android 4.4 and 5.0, it works fine. What could be the cause of this ? Please help

STACKTRACE

        04-28 15:51:13.143: W/System.err(2915): javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x870c918: Failure in SSL library, usually a protocol error
    04-28 15:51:13.143: W/System.err(2915): error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure (external/openssl/ssl/s23_clnt.c:658 0xb7c393a1:0x00000000)
    04-28 15:51:13.143: W/System.err(2915): 	at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:460)
    04-28 15:51:13.143: W/System.err(2915): 	at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:257)
    04-28 15:51:13.143: W/System.err(2915): 	at libcore.net.http.HttpConnection.setupSecureSocket(HttpConnection.java:210)
    04-28 15:51:13.143: W/System.err(2915): 	at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:477)
    04-28 15:51:13.153: W/System.err(2915): 	at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.connect(HttpsURLConnectionImpl.java:441)
    04-28 15:51:13.153: W/System.err(2915): 	at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282)
    04-28 15:51:13.153: W/System.err(2915): 	at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232)
    04-28 15:51:13.153: W/System.err(2915): 	at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
    04-28 15:51:13.153: W/System.err(2915): 	at libcore.net.http.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:164)
    04-28 15:51:13.153: W/System.err(2915): 	at com.ofss.fcdb.mobile.android.rms.helpers.NetworkConnector.getConnection(NetworkConnector.java:170)
    04-28 15:51:13.153: W/System.err(2915): 	at com.ofss.fcdb.mobile.android.rms.util.InitiateRMS$2.run(InitiateRMS.java:221)
    04-28 15:51:13.153: W/System.err(2915): 	at java.lang.Thread.run(Thread.java:856)
    04-28 15:51:13.153: W/System.err(2915): Caused by: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x870c918: Failure in SSL library, usually a protocol error
    04-28 15:51:13.153: W/System.err(2915): error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure (external/openssl/ssl/s23_clnt.c:658 0xb7c393a1:0x00000000)
    04-28 15:51:13.153: W/System.err(2915): 	at org.apache.harmony.xnet.provider.jsse.NativeCrypto.SSL_do_handshake(Native Method)
    04-28 15:51:13.153: W/System.err(2915): 	at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:410)
    04-28 15:51:13.153: W/System.err(2915): 	... 11 more
    04-28 16:42:44.139: W/ResourceType(3140): No package identifier when getting value for resource number 0x00000000



Javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: Failure in SSL library, usually a protocol error

I have the following setup:

    final OkHttpClient okHttpClient = new OkHttpClient();
    okHttpClient.setReadTimeout(5, TimeUnit.SECONDS);
    okHttpClient.setConnectTimeout(5, TimeUnit.SECONDS);

    RestAdapter.Builder builder = new RestAdapter.Builder()
            .setEndpoint(ROOT)
            .setClient(new OkClient(okHttpClient))
            .setLogLevel(RestAdapter.LogLevel.FULL);

I am trying to handle the situation in which my server is down and the user gets a connection timeout exception, this is my logging:

    java.net.SocketTimeoutException: failed to connect to /192.168.0.53 (port 3000) after 5000ms

Full logging: http://pastebin.com/gscCGb7x

Is there a way to route this into the retrofit failure method so I can handle it over there?

Thanks in advance!

Retrofit 2: Catch connection timeout exception

I just finished adjusting one of my apps to the new v22.1.1 support &amp; appcompat libraries, see [here][1] and [here][2] for more details. When I did some testing, something was off with the [ActionModes][3] I&#39;m using.

When you start a [ActionMode][4] using a `startSupportActionMode()` call - it does not matter if you use the now deprecated [ActionBarActivity][5] base class or the new [AppCompatActivity][6] base class - `onPrepareActionMode()` is not being called. 

In previous versions, including v21.0.3 &amp; v22.0.0, `onPrepareActionMode()` was called automatically, when the ActionMode was initially created using `startSupportActionMode()`. 

I tested it on a 2.2, 4.4.2 and 5.0 device, so it seems not to be version dependent.

Does anyone know, if this is intended behavior, that&#39;s been introduced in v22.1.1, or a bug?

I found this [issue][7], but there&#39;s not a lot of feedback here...

**Edit May 11 2015:**

As mentioned in the [Android issue tracker 159527][8], this issue not only affects the v22.1.x of appcompat and the support library, but also the 5.1 Android implementation.

Two possible temporary solutions at the moment, a general one:

    @Override
    public ActionMode startSupportActionMode(final ActionMode.Callback callback) {
      // Fix for bug https://code.google.com/p/android/issues/detail?id=159527
      final ActionMode mode = super.startSupportActionMode(callback);
      if (mode != null) {
        mode.invalidate();
      }
      return mode;
    }

and a &#39;quick and dirty&#39; one (when you instantiate your ActionMode):

    final ActionMode actionMode = startSupportActionMode(new MyActionMode());
    if(actionMode != null) {
    	actionMode.invalidate();
    }

If you don&#39;t use appcompat (`ActionBarActivity`/`AppCompatActivity`) you need to replace `startSupportActionMode()` with `startActionMode()`.

Unfortunately it&#39;s still not clear if this is intended new behavior or a bug. According to the [API doc][9] it&#39;s a bug/regression, but who knows...


  [1]: https://chris.banes.me/2015/04/22/support-libraries-v22-1-0/
  [2]: http://android-developers.blogspot.co.uk/2015/04/android-support-library-221.html
  [3]: https://developer.android.com/reference/android/support/v7/view/ActionMode.html
  [4]: https://developer.android.com/reference/android/support/v7/view/ActionMode.html
  [5]: https://developer.android.com/reference/android/support/v7/app/ActionBarActivity.html
  [6]: https://developer.android.com/reference/android/support/v7/app/AppCompatActivity.html
  [7]: https://code.google.com/p/android/issues/detail?id=159527
  [8]: https://code.google.com/p/android/issues/detail?id=159527
  [9]: http://developer.android.com/reference/android/view/ActionMode.Callback.html#onPrepareActionMode%28android.view.ActionMode,%20android.view.Menu%29

onPrepareActionMode not called when creating ActionMode

When I add the RecyclerView to the layout, it shows up as a blank screen.  Is there a way, such as through the `tools` namespace, to show a preview of the content of the RecyclerView?

Is there a way to show a preview of a RecyclerView&#39;s contents in the Android Studio editor?

I got this strange error with gradle, please help me!

    /.../app/build/intermediates/res/debug/drawable-xxhdpi-v4/ic_launcher.png:
        error: Duplicate file
    /.../app/build/intermediates/res/debug/drawable-xxhdpi/ic_launcher.png:
        Original is here. The version qualifier may be implied.
    Error:Execution failed for task &#39;:app:processDebugResources&#39;.
    com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException:
    Process &#39;command &#39;/.../sdk/build-tools/22.0.1/aapt&#39;&#39; finished with non-zero exit value 1

Before it was operating normally, but since I put classpath **com.android.tools.build:gradle:1.2.2**, this causes me errors


Gradle finished with non-zero exit value 1 (ic_launcher.png: error: Duplicate file)

I installed (Android studio 1.2 + SDK pack) for the first time, I created a test project with demo tab activity. I have not written a single line of code, everything has been generated by Android Studio

In fragment_main.xml the following problem occurs.

![enter image description here][1]


  [1]: http://i.stack.imgur.com/WQMWU.png

    java.lang.ClassNotFoundException: android.support.v4.view.ViewPropertyAnimatorListener
    	at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:127)
    	at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:53)
    	at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:84)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    	at java.lang.Class.getDeclaredConstructors0(Native Method)
    	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2585)
    	at java.lang.Class.getConstructor0(Class.java:2885)
    	at java.lang.Class.getConstructor(Class.java:1723)
    	at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:348)
    	at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105)
    	at com.android.tools.idea.rendering.LayoutlibCallback.loadView(LayoutlibCallback.java:177)
    	at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:214)
    	at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:142)
    	at android.view.LayoutInflater.inflate(LayoutInflater.java:482)
    	at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
    	at com.android.layoutlib.bridge.bars.BridgeActionBar.&lt;init&gt;(BridgeActionBar.java:84)
    	at com.android.layoutlib.bridge.bars.AppCompatActionBar.&lt;init&gt;(AppCompatActionBar.java:56)
    	at com.android.layoutlib.bridge.impl.RenderSessionImpl.createActionBar(RenderSessionImpl.java:1691)
    	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:362)
    	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:321)
    	at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
    	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:497)
    	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:485)
    	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:894)
    	at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:485)
    	at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:590)
    	at com.intellij.android.designer.designSurface.AndroidDesignerEditorPanel$6.run(AndroidDesignerEditorPanel.java:480)
    	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
    	at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
    	at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
    	at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
    	at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
    	at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
    	at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
    	at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)
    	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    	at java.lang.Thread.run(Thread.java:745)

xml:    

    &lt;RelativeLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&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:paddingLeft=&quot;@dimen/activity_horizontal_margin&quot;
        android:paddingRight=&quot;@dimen/activity_horizontal_margin&quot;
        android:paddingTop=&quot;@dimen/activity_vertical_margin&quot;
        android:paddingBottom=&quot;@dimen/activity_vertical_margin&quot;
        tools:context=&quot;.MainActivity$PlaceholderFragment&quot;&gt;
    
        &lt;TextView android:id=&quot;@+id/section_label&quot; android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot; /&gt;
    
    &lt;/RelativeLayout&gt;


Activity(No code errors here but I am surprised to see calls of deprecated functions in a demo code):   
    
    import java.util.Locale;
    
    import android.support.v7.app.ActionBarActivity;
    import android.support.v7.app.ActionBar;
    import android.support.v4.app.Fragment;
    import android.support.v4.app.FragmentManager;
    import android.support.v4.app.FragmentTransaction;
    import android.support.v4.app.FragmentPagerAdapter;
    import android.os.Bundle;
    import android.support.v4.view.ViewPager;
    import android.view.Gravity;
    import android.view.LayoutInflater;
    import android.view.Menu;
    import android.view.MenuItem;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.TextView;
    
    
    public class MainActivity extends ActionBarActivity implements ActionBar.TabListener {
    
        /**
         * The {@link android.support.v4.view.PagerAdapter} that will provide
         * fragments for each of the sections. We use a
         * {@link FragmentPagerAdapter} derivative, which will keep every
         * loaded fragment in memory. If this becomes too memory intensive, it
         * may be best to switch to a
         * {@link android.support.v4.app.FragmentStatePagerAdapter}.
         */
        SectionsPagerAdapter mSectionsPagerAdapter;
    
        /**
         * The {@link ViewPager} that will host the section contents.
         */
        ViewPager mViewPager;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            // Set up the action bar.
            final ActionBar actionBar = getSupportActionBar();
            actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    
            // Create the adapter that will return a fragment for each of the three
            // primary sections of the activity.
            mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
    
            // Set up the ViewPager with the sections adapter.
            mViewPager = (ViewPager) findViewById(R.id.pager);
            mViewPager.setAdapter(mSectionsPagerAdapter);
    
            // When swiping between different sections, select the corresponding
            // tab. We can also use ActionBar.Tab#select() to do this if we have
            // a reference to the Tab.
            mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
                @Override
                public void onPageSelected(int position) {
                    actionBar.setSelectedNavigationItem(position);
                }
            });
    
            // For each of the sections in the app, add a tab to the action bar.
            for (int i = 0; i &lt; mSectionsPagerAdapter.getCount(); i++) {
                // Create a tab with text corresponding to the page title defined by
                // the adapter. Also specify this Activity object, which implements
                // the TabListener interface, as the callback (listener) for when
                // this tab is selected.
                actionBar.addTab(
                        actionBar.newTab()
                                .setText(mSectionsPagerAdapter.getPageTitle(i))
                                .setTabListener(this));
            }
        }
    
    
        @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;
        }
    
        @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);
        }
    
        @Override
        public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
            // When the given tab is selected, switch to the corresponding page in
            // the ViewPager.
            mViewPager.setCurrentItem(tab.getPosition());
        }
    
        @Override
        public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        }
    
        @Override
        public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) {
        }
    
        /**
         * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
         * one of the sections/tabs/pages.
         */
        public class SectionsPagerAdapter extends FragmentPagerAdapter {
    
            public SectionsPagerAdapter(FragmentManager fm) {
                super(fm);
            }
    
            @Override
            public Fragment getItem(int position) {
                // getItem is called to instantiate the fragment for the given page.
                // Return a PlaceholderFragment (defined as a static inner class below).
                return PlaceholderFragment.newInstance(position + 1);
            }
    
            @Override
            public int getCount() {
                // Show 3 total pages.
                return 3;
            }
    
            @Override
            public CharSequence getPageTitle(int position) {
                Locale l = Locale.getDefault();
                switch (position) {
                    case 0:
                        return getString(R.string.title_section1).toUpperCase(l);
                    case 1:
                        return getString(R.string.title_section2).toUpperCase(l);
                    case 2:
                        return getString(R.string.title_section3).toUpperCase(l);
                }
                return null;
            }
        }
    
        /**
         * A placeholder fragment containing a simple view.
         */
        public static class PlaceholderFragment extends Fragment {
            /**
             * The fragment argument representing the section number for this
             * fragment.
             */
            private static final String ARG_SECTION_NUMBER = &quot;section_number&quot;;
    
            /**
             * Returns a new instance of this fragment for the given section
             * number.
             */
            public static PlaceholderFragment newInstance(int sectionNumber) {
                PlaceholderFragment fragment = new PlaceholderFragment();
                Bundle args = new Bundle();
                args.putInt(ARG_SECTION_NUMBER, sectionNumber);
                fragment.setArguments(args);
                return fragment;
            }
    
            public PlaceholderFragment() {
            }
    
            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                     Bundle savedInstanceState) {
                View rootView = inflater.inflate(R.layout.fragment_main, container, false);
                return rootView;
            }
        }
    
    }


android.support.v7.internal.widget.ActionBarOverlayLayout could not be instantiated

When I opened android studio today, it showed me the following errors:
![Error 1][1]


![Error 2][2]


Then, when after I restart Android Studio, I get these errors:
![Error 3][3]


  [1]: http://i.stack.imgur.com/g10zK.png
  [2]: http://i.stack.imgur.com/K9Qjc.png
  [3]: http://i.stack.imgur.com/So9TI.png

After I enable &quot;Android Support&quot;, and restart, the first two errors show again, and when I restart again, I get this 3rd error again and the &quot;Android Support&quot; plugin is disabled again. (I even tried uninstalling and reinstalling Android Studio)

How can I fix this?

Android Studio &quot;Unable to save plugin settings&quot;

I want to have the &#39;Ctrl&#39;+&#39;K&#39;,&#39;Ctrl&#39;+&#39;D&#39; functionality of Sublime in Android Studio, how do I do it?

&gt; Perfectly similar to this question, but with respect to Android Studio.
https://stackoverflow.com/questions/11548308/how-do-i-skip-a-match-when-using-ctrld-for-multiple-selections-in-sublime-text

I use **Ctrl+D** to add to selection (discrete multiple select) the next occurrence of the string (or substring) highlighted. And to skip adding next immediate selection to selection but the one after it, I use **Ctrl+K, Ctrl+D**. How do I do the same in Android Studio.

I just know Alt+J is similar to Ctrl+D (found from Keymappings in Android Studio). 

&gt; And to deselect the last selected it&#39;s Alt+Shift+D. 

But how do I skip next occurrence?

&gt;My question is in no way related to: 
https://stackoverflow.com/questions/12500502/does-intellij-idea-have-a-ctrl-k-ctrl-d-equivalent. That&#39;s Visual Studio equivalent. I want the SublimeText equivalent.


Does IntelliJ have a `Ctrl` + `K`,`Ctrl` + `D` Sublime equivalent? How do I skip a match when using Alt+J for multiple selections in Android Studio?

With the new design library there are several new layouts that change a lot how the toolbar can behave if the developer so wishes. Since different fragments have different behaviors and objectives, for example a gallery fragment with a collapsing toolbar showing an important photo, or a fragment without a scrollview that just doesn&#39;t need the appbarlayout for hiding the toolbar, having a single toolbar in the activity can prove difficult.

So with this, should I move the toolbar to each fragment? If so, I have to set the supportActionBar each time I show a fragment and also have a reference of the activity in the fragment which nullifies the independent nature of fragments. If I leave the toolbar in the Activity alone, I have to have multiple layouts defined for each type of behavior in each fragment. What would be the best approach?

Coordinator Layout with Toolbar in Fragments or Activity

[![Back button on toolbar](http://i.stack.imgur.com/iJ5BW.png)](http://i.stack.imgur.com/iJ5BW.png)

How can I set back arrow in Android toolbar and also apply click listener?

How to display and set click event on Back Arrow on Toolbar?

I am having the following problem:

I know how to set up a toolbar to show a back button icon instead of a burger button icon.
&lt;br&gt;&lt;br&gt;
From this:
&lt;br&gt;
[![enter image description here][1]][1]

to this:

[![enter image description here][2]][2]

using: `getSupportActionBar().setDisplayHomeAsUpEnabled(true);`

&lt;br&gt;Now, I want to do the reverse action, I want to go from back button icon to burger icon:

[![enter image description here][2]][2]

to here:

[![enter image description here][1]][1]

How can I do this?

**Update:**

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setSupportActionBar(mToolbar);
        getSupportActionBar().setDisplayShowTitleEnabled(false);
    }

    private void enableViews(boolean enable) {
        if(enable) {
            // Enables back button icon
            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        } else {
            // TODO: Enables burger icon
        }
    }

  [1]: http://i.stack.imgur.com/Sx26a.png
  [2]: http://i.stack.imgur.com/dF12T.png

Android - Switch ActionBar Back Button to Navigation Button

I wana add a notification badge on the cart image placed in action bar and manipulate it programmatically. Any Help?

Notification Badge On Action Item Android

Using: 
`buildToolsVersion &quot;22.0.1&quot;` , 
`targetSdkVersion 22` in my gradle file.

I found that the useful `getResources().getColor(R.color.color_name)` is deprecated.

What should I use instead?

getResources().getColor() is deprecated

I have updated my Android Studio to version **1.3.0** before 3 days.

Before that I can use NDK and now I am getting error like ,

&gt;Error:(50, 0) Error: NDK integration is deprecated in the current plugin.  Consider trying the new experimental plugin.  For details, see http://tools.android.com/tech-docs/new-build-system/gradle-experimental.  Set &quot;android.useDeprecatedNdk=true&quot; in gradle.properties to continue using the current NDK integration.

I can not find file gradle.property at project level.

How can I solve this error?

After updating Android Studio to version 1.3.0 I am getting &quot;NDK integration is deprecated in the current plugin&quot; Error

In iOS8 and prior I can use:

    NSString *str = ...; // some URL
    NSString *result = [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

in iOS9 `stringByAddingPercentEscapesUsingEncoding` has been replaced with `stringByAddingPercentEncodingWithAllowedCharacters`:

    NSString *str = ...; // some URL
    NSCharacterSet *set = ???; // where to find set for NSUTF8StringEncoding?
    NSString *result = [str stringByAddingPercentEncodingWithAllowedCharacters:set];

and my question is: where to find needed `NSCharacterSet` (`NSUTF8StringEncoding`) for proper replacement of `stringByAddingPercentEscapesUsingEncoding`?

Replacement for stringByAddingPercentEscapesUsingEncoding in ios9?

I am using this code:

    mediaLibraryPopover = [[UIPopoverController alloc] 
                            initWithContentViewController:avc];
    [self.mediaLibraryPopover presentPopoverFromRect:[theButton bounds] 
                              inView:theButton 
                              permittedArrowDirections:UIPopoverArrowDirectionAny 
                              animated:YES];

And I am getting this warning in Xcode 7:

&gt; UIPopoverController is deprecated, first deprecated in iOS 9.0 - UIPopoverController is deprecated. Popovers are now implemented as UIViewController presentations. Use a modal presentation style of UIModalPresentationPopover and UIPopoverPresentationController.

How can I fix the &quot;UIPopoverController is deprecated&quot; warning?

&gt; **public void setTextAppearance (Context context, int resId)
Added in API level 1** 
&lt;br/&gt;
This method was deprecated in API level 23.
Use setTextAppearance(int) instead. 

**My Question**: Why it&#39;s been deprecated? Why it doesn&#39;t need `Context` anymore? And most importantly, how to use `setTextAppearance(int resId)` for older versions?

Content Type	Original Author	Original Content on Stackoverflow
Question	user4696584	View Question on Stackoverflow
Solution 1 - Android	Gaëtan	View Answer on Stackoverflow
Solution 2 - Android	Jorge Casariego	View Answer on Stackoverflow
Solution 3 - Android	Amol Desai	View Answer on Stackoverflow

ActionBarActivity is deprecated

Android Problem Overview

Android Solutions

Solution 1 - Android

Solution 2 - Android

Solution 3 - Android

Removing element from array in component state

Identifying and solving javax.el.PropertyNotFoundException: Target Unreachable

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