    &lt;android.support.v7.widget.CardView
        android:id=&quot;@+id/card_view&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_marginLeft=&quot;@dimen/card_outer_padding&quot;
        android:layout_marginTop=&quot;@dimen/card_outer_padding&quot;
        android:layout_marginRight=&quot;@dimen/card_outer_padding&quot;
        android:layout_marginBottom=&#39;@{model.cardBottomMargin}&#39;
        android:foreground=&quot;?attr/selectableItemBackground&quot;
        android:onClick=&quot;@{model::onCardClick}&quot;
        app:cardElevation=&quot;2dp&quot;
        app:cardCornerRadius=&quot;2dp&quot;
        app:cardUseCompatPadding=&quot;true&quot;&gt;
    &lt;/android.support.v7.widget.CardView&gt;

I got this error message 

Cannot resolve symbol `?attr/selectableItemBackground`
Validates resource references inside Android XML files.


    &lt;TextView
        android:id=&quot;@+id/country_name&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_marginRight=&quot;40dp&quot;
        android:text=&quot;@{model.name}&quot;
        style=&quot;@style/TextAppearance.AppCompat.Headline&quot;
        tools:text=&quot;Country&quot;/&gt;

And, I got a similar error for the above as well

Cannot resolve symbol &#39;@style/TextAppearance.AppCompat.Headline&#39;  
Validates resource references inside Android XML files.

Any pointer would be great! Thank you!
It seems to be related to this [thread][1] but no solution was provided:



  [1]: https://stackoverflow.com/questions/17870303/ide-cannot-resolve-style-theme-appcompat-when-using-v7-compatibility-support

Android Cannot resolve symbol &#39;?attr/selectableItemBackground&#39;

I want to make my app work only in landscape mode but can&#39;t make it work. I have given `screenOrientation = &quot;landscape&quot;` even though the first page will be in landscape mode and other activity will be in portrait. 

**XML FILE**

    &lt;application android:icon=&quot;@drawable/icon&quot; android:label=&quot;@string/app_name&quot;&gt;
        &lt;activity android:name=&quot;.Main&quot;
                  android:label=&quot;@string/app_name&quot;
                  android:screenOrientation=&quot;landscape&quot; android:theme=&quot;@android:style/Theme.NoTitleBar.Fullscreen&quot;&gt;
            &lt;intent-filter&gt;
                &lt;action android:name=&quot;android.intent.action.MAIN&quot; /&gt;
                &lt;category android:name=&quot;android.intent.category.LAUNCHER&quot; /&gt;
            &lt;/intent-filter&gt;     
               
        &lt;/activity&gt;
            
        &lt;activity android:name=&quot;.IntroHome&quot;
                  android:label=&quot;@string/app_name&quot;
                  android:screenOrientation=&quot;landscape&quot;&gt;
        &lt;/activity&gt;
            
        &lt;activity android:name=&quot;.ObjectivesPage&quot;
                  android:label=&quot;@string/app_name&quot;
                  android:screenOrientation=&quot;landscape&quot; &gt;
        &lt;/activity&gt;
        
        &lt;activity android:name=&quot;.MenuPage&quot;
                  android:label=&quot;@string/app_name&quot;
                  android:screenOrientation=&quot;landscape&quot; &gt;
        &lt;/activity&gt;
    &lt;/application&gt;

&lt;uses-permission android:name=&quot;android.permission.INTERNET&quot; /&gt;
&lt;supports-screens android:anyDensity=&quot;true&quot; /&gt; 




                 

 **JAVA CLASS**



    public class ObjectivesPage extends Activity{
    
        ImageButton  imgButton;
    	public void onCreate(Bundle savedInstanceState) {
    	    super.onCreate(savedInstanceState);
    	    setContentView(R.layout.objectivespage);
    	    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
    
    		imgButton = (ImageButton)findViewById(R.id.buttonCloseNGo);
    		imgButton.setOnClickListener(onClickCloseNGo);
    	}
    
    	private OnClickListener onClickCloseNGo = new OnClickListener(){
    
    		public void onClick(View v) {
	    		Intent intent = new Intent(ObjectivesPage.this,MenuPage.class);
		    	startActivity(intent);
  		    }
    	};
    }


i want to make my application only in landscape in android

I am having an error in following xml file. *&quot;Unexpected namespace prefix &quot;xmlns&quot; found for tag LinearLayout&quot;*. I tried the solutions provided in other similar questions also but it didn&#39;t work for me. Same error is occurring in 3 lines where `LinearLayout` is used.

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;ScrollView xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:layout_width=&quot;fill_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:background=&quot;@drawable/background&quot; &gt;

        &lt;LinearLayout
            xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
            android:layout_width=&quot;fill_parent&quot;
            android:layout_height=&quot;fill_parent&quot;
            android:orientation=&quot;vertical&quot; &gt;

            &lt;TextView
                android:id=&quot;@+id/menu_top_text&quot;
                android:layout_width=&quot;wrap_content&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:text=&quot;@string/name_version&quot;
                android:textColor=&quot;@color/black&quot;
                android:textSize=&quot;20sp&quot; /&gt;

            &lt;LinearLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:orientation=&quot;horizontal&quot; &gt;
            &lt;/LinearLayout&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;30px&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;LinearLayout
                xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:gravity=&quot;center_horizontal&quot;
                android:orientation=&quot;vertical&quot; &gt;

                &lt;LinearLayout
                    xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
                    android:layout_width=&quot;fill_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:gravity=&quot;center&quot;
                    android:orientation=&quot;horizontal&quot; &gt;

                    &lt;Button
                        android:id=&quot;@+id/start_stop_button&quot;
                        android:layout_width=&quot;74dp&quot;
                        android:layout_height=&quot;74dp&quot;
                        android:text=&quot;@string/start_server&quot; /&gt;

                    &lt;Button
                        android:id=&quot;@+id/instructions&quot;
                        android:layout_width=&quot;120dp&quot;
                        android:layout_height=&quot;74dp&quot;
                        android:text=&quot;@string/instructions_label&quot; /&gt;

                    &lt;Button
                        android:id=&quot;@+id/setup&quot;
                        android:layout_width=&quot;74dp&quot;
                        android:layout_height=&quot;74dp&quot;
                        android:text=&quot;@string/setup_label&quot; /&gt;
                &lt;/LinearLayout&gt;
            &lt;/LinearLayout&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;30px&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;1px&quot;
                android:background=&quot;#666666&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;10px&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;TableLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:shrinkColumns=&quot;2&quot; &gt;

                &lt;TableRow&gt;

                    &lt;TextView
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:gravity=&quot;left&quot;
                        android:text=&quot;@string/server_status&quot;
                        android:textColor=&quot;@color/black&quot;
                        android:textSize=&quot;16sp&quot; /&gt;
                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;

                    &lt;TextView
                        android:id=&quot;@+id/server_status&quot;
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:text=&quot;@string/unknown&quot;
                        android:textColor=&quot;@color/black&quot;
                        android:textSize=&quot;16sp&quot; /&gt;
                &lt;/TableRow&gt;
            &lt;/TableLayout&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;10px&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;1px&quot;
                android:background=&quot;#666666&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;10px&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;TableLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:shrinkColumns=&quot;2&quot; &gt;

                &lt;TableRow&gt;

                    &lt;TextView
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:gravity=&quot;left&quot;
                        android:text=&quot;@string/my_url_is&quot;
                        android:textColor=&quot;@color/black&quot;
                        android:textSize=&quot;16sp&quot; /&gt;
                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;

                    &lt;TextView
                        android:id=&quot;@+id/ip_address&quot;
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:text=&quot;@string/no_url_yet&quot;
                        android:textColor=&quot;@color/black&quot;
                        android:textSize=&quot;16sp&quot; /&gt;
                &lt;/TableRow&gt;

                &lt;TableRow&gt;

                    &lt;TextView
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:gravity=&quot;left&quot;
                        android:text=&quot;@string/wifi_status&quot;
                        android:textColor=&quot;@color/black&quot;
                        android:textSize=&quot;16sp&quot; /&gt;
                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;

                    &lt;TextView
                        android:id=&quot;@+id/wifi_status&quot;
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:text=&quot;@string/unknown&quot;
                        android:textColor=&quot;@color/black&quot;
                        android:textSize=&quot;16sp&quot; /&gt;
                &lt;/TableRow&gt;

                &lt;TableRow&gt;

                    &lt;TextView
                        android:id=&quot;@+id/last_error_label&quot;
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:gravity=&quot;left&quot;
                        android:text=&quot;@string/last_error&quot;
                        android:textSize=&quot;16sp&quot;
                        android:visibility=&quot;gone&quot; /&gt;
                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;

                    &lt;TextView
                        android:id=&quot;@+id/last_error&quot;
                        android:layout_width=&quot;wrap_content&quot;
                        android:layout_height=&quot;wrap_content&quot;
                        android:text=&quot;@string/unknown&quot;
                        android:textColor=&quot;#ff0000&quot;
                        android:textSize=&quot;16sp&quot;
                        android:visibility=&quot;gone&quot; /&gt;
                &lt;/TableRow&gt;
            &lt;/TableLayout&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;10px&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;1px&quot;
                android:background=&quot;#666666&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;!--
              &lt;TextView android:id=&quot;@+id/proxy_header&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:text=&quot;@string/proxy_experimental&quot;
            android:textSize=&quot;16sp&quot;
            /&gt;
            --&gt;

            &lt;TableLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:shrinkColumns=&quot;2&quot; &gt;

                &lt;TableRow&gt;

                    &lt;!--
                     &lt;TextView
                    android:layout_height=&quot;wrap_content&quot;
                    android:layout_width=&quot;wrap_content&quot;
                    android:text=&quot;@string/proxy_status&quot;
                    android:textSize=&quot;16sp&quot;
                    android:gravity=&quot;left&quot;
                    /&gt;
                    --&gt;
                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;
                &lt;/TableRow&gt;

                &lt;TableRow&gt;

                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;
                &lt;/TableRow&gt;

                &lt;TableRow&gt;

                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;
                &lt;/TableRow&gt;

                &lt;TableRow&gt;

                    &lt;!-- A small spacer between the columns --&gt;

                    &lt;FrameLayout
                        android:layout_width=&quot;3sp&quot;
                        android:layout_height=&quot;wrap_content&quot; /&gt;
                &lt;/TableRow&gt;
            &lt;/TableLayout&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;1dp&quot;
                android:background=&quot;#666666&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;1dp&quot;
                android:background=&quot;#666666&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;LinearLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:orientation=&quot;horizontal&quot;
                android:visibility=&quot;gone&quot; &gt;

                &lt;TextView
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:text=&quot;@string/server_log&quot;
                    android:textColor=&quot;#ffffff&quot; /&gt;

                &lt;CheckBox
                    android:id=&quot;@+id/server_log_checkbox&quot;
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:checked=&quot;false&quot; /&gt;
            &lt;/LinearLayout&gt;

            &lt;TextView
                android:id=&quot;@+id/server_log&quot;
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:background=&quot;#333333&quot; /&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;1dp&quot;
                android:background=&quot;#666666&quot;
                android:visibility=&quot;gone&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;LinearLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:orientation=&quot;horizontal&quot;
                android:visibility=&quot;gone&quot; &gt;

                &lt;TextView
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:text=&quot;@string/session_monitor&quot;
                    android:textColor=&quot;#ffffff&quot;
                    android:visibility=&quot;gone&quot; /&gt;

                &lt;CheckBox
                    android:id=&quot;@+id/session_monitor_checkbox&quot;
                    android:layout_width=&quot;wrap_content&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:checked=&quot;false&quot;
                    android:visibility=&quot;gone&quot; /&gt;
            &lt;/LinearLayout&gt;

            &lt;TextView
                android:id=&quot;@+id/session_monitor&quot;
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;wrap_content&quot;
                android:background=&quot;#333333&quot;
                android:visibility=&quot;gone&quot; /&gt;

            &lt;!-- A horizontal line --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;1dp&quot;
                android:background=&quot;#666666&quot; &gt;
            &lt;/FrameLayout&gt;

            &lt;!-- It&#39;s visually pleasing to have some empty space at the bottom --&gt;

            &lt;FrameLayout
                android:layout_width=&quot;fill_parent&quot;
                android:layout_height=&quot;15dp&quot; /&gt;
        &lt;/LinearLayout&gt;

    &lt;/ScrollView&gt;

Unexpected namespace prefix &quot;xmlns&quot; found for tag LinearLayout

I have custom designed `EditText` 

![enter image description here][1]


**search_page.xml**

    &lt;LinearLayout
        android:layout_width=&quot;fill_parent&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:orientation=&quot;horizontal&quot;
        android:padding=&quot;10dp&quot;
        android:background=&quot;#E1E1E1&quot;
        android:weightSum=&quot;1&quot; &gt;
    
        &lt;TextView
            android:layout_width=&quot;0dp&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_weight=&quot;.25&quot;
            android:text=&quot;City&quot; /&gt;
    
        &lt;EditText
            android:layout_width=&quot;0dp&quot;
            android:layout_height=&quot;wrap_content&quot;
            android:layout_marginLeft=&quot;10dp&quot;
            android:background=&quot;@drawable/rounded_edittext&quot;
            android:layout_weight=&quot;.75&quot; /&gt;
    &lt;/LinearLayout&gt;



**rounded_edittext.xml**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;!-- res/drawable/rounded_edittext.xml --&gt;
    &lt;shape xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:padding=&quot;10dp&quot;
        android:shape=&quot;rectangle&quot; &gt;
    
        &lt;solid android:color=&quot;#FFFFFF&quot; /&gt;
    
        &lt;corners
            android:bottomLeftRadius=&quot;10dp&quot;
            android:bottomRightRadius=&quot;10dp&quot;
            android:topLeftRadius=&quot;10dp&quot;
            android:topRightRadius=&quot;10dp&quot; /&gt;
    
    &lt;/shape&gt;


----------

I want to use color code **`#2f6699`** to get a border color like an outline to the `EditText` text box as below:

![enter image description here][2]





**Any ideas on how to achieve this?** 


  [1]: http://i.stack.imgur.com/1Vrll.png
  [2]: http://i.stack.imgur.com/ll2Gf.png

Custom designing EditText

I&#39;m wondering if it&#39;s possible to change the color of the ScrollView. 

I&#39;m not referring to the background color or the edges.&lt;br&gt;
I attached a print screen of the bar I&#39;m referring. For me, it&#39;s kind of transparnt. 

Here&#39;s how I defined it in the xml: 

    &lt;ScrollView  
        android:layout_width=&quot;wrap_content&quot; 
        android:layout_height=&quot;wrap_content&quot; 
        android:fadeScrollbars=&quot;false&quot;
        android:layout_toLeftOf=&quot;@+id/personalscores_BackButton&quot; 
        android:layout_marginRight=&quot;0dp&quot; &gt; 

![scroll bar][1]

  [1]: http://i.stack.imgur.com/okk1m.png

how to change color of the actual scroll in ScrollView android?

I would like to have a way to reference the project&#39;s manifest version number in the main part of the code. What I have been doing up until now is to link the version number in a String XML file to the manifest (@string/Version). What I would like to do is to do it the other way around, link a string XML variable to the version in the manifest. The reason? I&#39;d like to only have to change the version number in one location, the manifest file. Is there any way to do this? Thanks!

How can you get the Manifest Version number from the App&#39;s (Layout) XML variables?

I have created a custom widget, and I&#39;m declaring it in layout.xml.  I have also added some custom attributes in attr.xml.  However, when trying to declare these attributes in a style in styles.xml, it&#39;s giving me `No resource found that matches the given name: attr &#39;custom:attribute&#39;.`

I have put the `xmlns:custom=&quot;http://schemas.android.com/apk/res/com.my.package&quot;` in all of the tags in styles.xml, including `&lt;?xml&gt;`, `&lt;resources&gt;`, and `&lt;style&gt;`, but it still gives me the same error, that it can&#39;t find my custom XML namespace.

I can, however, use my namespace to manually assign attributes to the view in my layout.xml, so there is nothing wrong with the namespace.  My issue lies in making styles.xml aware of my attr.xml.

Custom attributes in styles.xml

I&#39;m trying to figure out how to define a vertical line (1dp thick) to be used as a drawable.

To make a horizontal one, it&#39;s pretty straightforward:

    &lt;shape xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; android:shape=&quot;line&quot;&gt;
        &lt;stroke android:width=&quot;1dp&quot; android:color=&quot;#0000FF&quot;/&gt;
        &lt;size android:height=&quot;50dp&quot; /&gt;     
    &lt;/shape&gt;

The question is, how to make this line vertical?

Yes, there are workarounds, such as drawing a rectangle shape 1px thick, but that complicates the drawable XML, if it consists of multiple `&lt;item&gt;` elements.

Anyone had any chance with this?

**UPDATE**

Case is still unsolved. However,
For anyone on a Android documentation crusade - you might find this useful:
**[Missing Android XML Manual][1]** 


**UPDATE**

I found no other way other than the one that I marked as correct. It does the trick though feels a bit &quot;heavy&quot;, thus if you happen to know the answer don&#39;t forget to share ;)


  [1]: http://idunnolol.com/android/drawables.html

Vertical line using XML drawable

Does the documentation ( or anyone) talks about the dpi values of the default 

* Large TextView {`        android:textAppearance=&quot;?android:attr/textAppearanceLarge&quot;`}
* Medium TextView {`        android:textAppearance=&quot;?android:attr/textAppearanceMedium&quot;`}
* Small TextView        { `android:textAppearance=&quot;?android:attr/textAppearanceSmall&quot;`}

widgets in the SDK ?




![The Large, medium, small and regular text views][1]

To put it in another way, can we replicate the appearance of these text views without using the `android:textAppearance` attribute?




  [1]: http://i.stack.imgur.com/dFo3D.png
  [2]: http://i.stack.imgur.com/t22Bg.png

dpi value of default &quot;large&quot;, &quot;medium&quot; and &quot;small&quot; text views android

How do you add a background image to a shape? The code I tried below but no success:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;shape xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
    android:shape=&quot;rectangle&quot; android:padding=&quot;10dp&quot;&gt;
    //here is where i need to set the image
    &lt;solid android:color=&quot;@drawable/button_image&quot;/&gt;
        &lt;corners
         android:bottomRightRadius=&quot;5dp&quot;
         android:bottomLeftRadius=&quot;5dp&quot;
         android:topLeftRadius=&quot;5dp&quot;
         android:topRightRadius=&quot;5dp&quot;/&gt;
     &lt;/shape&gt;


Add a background image to shape in XML Android

Is it possible to access a BuildConfig value from AndroidManifest.xml?

In my build.gradle file, I have:

    defaultConfig {
        applicationId &quot;com.compagny.product&quot;
        minSdkVersion 16
        targetSdkVersion 21
        versionCode 1
        versionName &quot;1.0&quot;

        // Facebook app id
        buildConfigField &quot;long&quot;, &quot;FACEBOOK_APP_ID&quot;, FACEBOOK_APP_ID
    }

`FACEBOOK_APP_ID` is defined in my gradle.properties files:

    # Facebook identifier (app ID)
    FACEBOOK_APP_ID=XXXXXXXXXX

To use Facebook connect in my app, I must add this line to my AndroidManifest.xml:

    &lt;meta-data android:name=&quot;com.facebook.sdk.ApplicationId&quot; android:value=&quot;@string/applicationId&quot;/&gt; 

I want to replace `@string/applicationId` by the BuildConfig field `FACEBOOK_APP_ID` defined in gradle, like this:

    &lt;meta-data android:name=&quot;com.facebook.sdk.ApplicationId&quot; android:value=&quot;FACEBOOK_APP_ID&quot;/&gt; 

Is that possible using BuildConfig? If not, how can I achieve this?

How can I access a BuildConfig value in my AndroidManifest.xml file?

I would like to store drawable resources&#39; ID in the form of `R.drawable.*` inside an array using an XML values file, and then retrieve the array in my activity.

Any ideas of how to achieve this?

Storing R.drawable IDs in XML array

I am creating an app, with resources that can be reused (because buttons are always the same, but mirrored or rotated). I do want to use the same resource so I don&#39;t have to add 3 more resources that are exactly like the original but rotated. But I also don&#39;t want to mix the code with things that can be declared in the XML or make transformations with a matrix that will cost processing time.

I&#39;ve got a two state button declared in an XML.

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;selector xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        &lt;item android:state_pressed=&quot;true&quot;
              android:drawable=&quot;@drawable/and_card_details_button_down_left_onclick&quot; /&gt; &lt;!-- pressed --&gt;
        &lt;item android:drawable=&quot;@drawable/and_card_details_button_down_left&quot; /&gt; &lt;!-- default --&gt;
    &lt;/selector&gt;

and I want to reuse the drawable because it will be the same but rotated 90&#186; and 45&#186; and I assign to the button as a drawable.

    &lt;Button android:id=&quot;@+id/Details_Buttons_Top_Left_Button&quot;
            android:layout_width=&quot;fill_parent&quot;
            android:layout_height=&quot;fill_parent&quot;
            android:background=&quot;@drawable/details_menu_large_button&quot; /&gt;


I know that I can rotate it with a [`RotateDrawable`][1] or with a [`Matrix`][2] but as I already explained I don&#39;t like that approach.

Is it possible to achieve that directly on the XML or what do you think that will be the best way to do it? Put all resources but rotated, rotate them in the code?

--- EDIT ---
The answer of @dmaxi works great, this is how to combine it with an item list :)

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;selector xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;&gt;
        
        &lt;item android:state_pressed=&quot;true&quot;&gt;
            &lt;rotate 
            android:fromDegrees=&quot;90&quot;
            android:toDegrees=&quot;90&quot;
            android:pivotX=&quot;50%&quot;
            android:pivotY=&quot;50%&quot;
            android:drawable=&quot;@drawable/and_card_details_button_up_onclick&quot;/&gt;
        &lt;/item&gt;
    
        &lt;item&gt;
            &lt;rotate
            android:fromDegrees=&quot;90&quot;
            android:toDegrees=&quot;90&quot;
            android:pivotX=&quot;50%&quot;
            android:pivotY=&quot;50%&quot;
            android:drawable=&quot;@drawable/and_card_details_button_up_onclick&quot;/&gt;
        &lt;/item&gt;
        
    &lt;/selector&gt;

  [1]: http://developer.android.com/reference/android/graphics/drawable/RotateDrawable.html
  [2]: http://developer.android.com/reference/android/graphics/Matrix.html

Is it possible to rotate a drawable in the xml description?

What is the difference between `invisible` and `gone` for the View visibility status?


Android : difference between invisible and gone?

&gt; What is the diffirence between the `@id/` and `@+id/`?

In **`@+id/`** the plus symbol `+` instructs to create a new resource name and add in to the `R.java` file but what about **`@id/`**? From the documentation of [`ID`][2]: when referencing an Android resource `ID`, you do not need the plus symbol, but must add the android package namespace, like so:

    android:id=&quot;@android:id/list&quot;

But in the image below Eclipse doesn&#39;t suggest any kind of `@android:id/`.

![Image showing the suggestion for the @/id and @+/id][1]

&gt; Are `@id/` and `@android:id/` the same? 

  [1]: http://i.stack.imgur.com/zgbUz.png
  [2]: http://developer.android.com/guide/topics/ui/declaring-layout.html#id


Difference between &quot;@id/&quot; and &quot;@+id/&quot; in Android

How would one fetch the accent color set in styles, like below, programmatically? 

        &lt;item name=&quot;android:colorAccent&quot;&gt;@color/material_green_500&lt;/item&gt;

How to get accent color programmatically?

**Edited Question:**

**Mobile Resolution:**&lt;br&gt; I would like to design different screen dpi like following resolutions. 
&lt;br&gt;320x480,&lt;br&gt;480&#215;800,&lt;br&gt;540x960,&lt;br&gt;720x1280 (Samsung S3),&lt;br&gt;1080x1920 (S4, Nexus5,Nexus 5x, Moto G4),&lt;br&gt;2560 x 1440 (Nexus 6, Nexus 6p, Samsung edge)&lt;br&gt;&lt;br&gt;
**Tablet Resolution:**&lt;br&gt; 480x800 (micromax) ,&lt;br&gt;600x1024 (samsung tab2),&lt;br&gt;800x1280 (nexus 7),&lt;br&gt;1200x1920 (new nexus 7),&lt;br&gt;2048x1536 (nexus 9)
 
I want to use **different font sizes** depending on the device display resolution. 

Q1) What is the `best` way to solve this `problem`?

Q2) What is best option doing throw coding or XML?

Q3) Which drawable folder is represent which device resolution?

Q4) Application Launcher icon size for different resolution?


Different resolution support android

**Problem**&lt;br /&gt;
I would like to be able to do something like that in Android XML code:

    &lt;string name=&quot;title&quot;&gt;@string/app_name test&lt;/string&gt;
    &lt;string name=&quot;title2&quot;&gt;@string/app_name @string/version_name&lt;/string&gt;

Regarding first line of code compiler shows this error &lt;br /&gt;
&gt;No resource found that matches the given name (at &#39;title&#39; with value &#39;@string/app\_name test&#39;)

and regarding second line of code compiler shows this error &lt;br /&gt;
&gt;No resource found that matches the given name (at &#39;title2&#39; with value &#39;@string/app_name @string/version_name&#39;)

**Question**&lt;br/&gt;
Does anybody know how to concatenate multiple strings in Android XML?

**Rationale**&lt;br /&gt;
It is bad practice to duplicate variable values in many places of code (in this case XML).






How to concatenate multiple strings in android XML?

* Getting Unknown attribute error on all android tag. 

* In layout XML, Auto suggestion is not showing all attributes (like layout_width, layout_height, orientation, orientation &amp; all others android attributes.)

Here is a Snap shot

[![enter image description here][1]][1]

[![enter image description here][2]][2]
  [1]: http://i.stack.imgur.com/Igpr9.png
  [2]: http://i.stack.imgur.com/MN3lK.png

Things i have done to resolve this issue.

* Clean Build &amp; Rebuild
* Deleted .idea file
* Invalidated Caches/ Restart.. option
* Turn On Power Save Mode.

SDk is up to date. 

In App Level Gridle

    apply plugin: &#39;com.android.application&#39;

    android {
        compileSdkVersion 23
        buildToolsVersion &quot;23.0.2&quot;

        defaultConfig {
            applicationId &quot;com.example.abhishek.ondemandservice&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;
            }
        }
    }

Application level Gride.

    buildscript {
        repositories {
            maven { url &quot;http://dl.bintray.com/populov/maven&quot; }
            jcenter()
            mavenCentral()
        }
        dependencies {
            classpath &#39;com.android.tools.build:gradle:1.5.0&#39;

            // NOTE: Do not place your application dependencies here; they belong
            // in the individual module build.gradle files
        }
    }

    allprojects {
        repositories {
            maven { url &quot;http://dl.bintray.com/populov/maven&quot; }
            jcenter()
            mavenCentral()
        }
    }

Unknown attribute android:layout_width, layout_height, id, gravity, layout_gravity, padding

even with android support v7 included in my application

adding
`android:background=&quot;?android:attr/selectableItemBackground&quot;`

makes my IDE, Eclipse throw an error (preventing me from compiling), notifying me that selectableItemBackground is only for min Api 11 and up.

How do I add this attribute to a background in XML?

assume that copying and pasting from a higher library is not a solution

android - apply selectableItemBackground in xml with support v7

Using the [Fonts in XML][1] feature you can specify various font weights for a font family. For example:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;font-family xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
                 xmlns:app=&quot;http://schemas.android.com/apk/res-auto&quot;&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_regular&quot; android:fontWeight=&quot;400&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_regular&quot; app:fontWeight=&quot;400&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_regular_italic&quot; android:fontWeight=&quot;400&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_regular_italic&quot; app:fontWeight=&quot;400&quot; app:fontStyle=&quot;italic&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_medium&quot; android:fontWeight=&quot;500&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_medium&quot; app:fontWeight=&quot;500&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_medium_italic&quot; android:fontWeight=&quot;500&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_medium_italic&quot; app:fontWeight=&quot;500&quot; app:fontStyle=&quot;italic&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_semibold&quot; android:fontWeight=&quot;600&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_semibold&quot; app:fontWeight=&quot;600&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_semibold_italic&quot; android:fontWeight=&quot;600&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_semibold_italic&quot; app:fontWeight=&quot;600&quot; app:fontStyle=&quot;italic&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_bold&quot; android:fontWeight=&quot;700&quot; android:fontStyle=&quot;normal&quot;
            app:font=&quot;@font/archivo_narrow_bold&quot; app:fontWeight=&quot;700&quot; app:fontStyle=&quot;normal&quot;/&gt;

        &lt;font android:font=&quot;@font/archivo_narrow_bold_italic&quot; android:fontWeight=&quot;700&quot; android:fontStyle=&quot;italic&quot;
            app:font=&quot;@font/archivo_narrow_bold_italic&quot; app:fontWeight=&quot;700&quot; app:fontStyle=&quot;italic&quot;/&gt;

    &lt;/font-family&gt;

But I cannot figure out how to actually make use of each of these weights; either in an XML (layout/style) file, or in Java code. Their is no `fontWeight` attribute available for `TextView`, and the [`Typeface`][2] object created from [`ResourcesCompat.getFont(context, R.font.archivo_narrow)`][3] has no mention of font weights.

I realize that I can just specify the specific font resource (i.e. `R.font.archivo_narrow_semibold`), but then what is the point of having a `fontWeight` attribute in the `font-family`? 

---

### Update

A new static [`create(Typeface family, int weight, boolean italic)`][4] method was added in API Level 28, along with a [`getWeight()`][5] instance method. This finally makes it possible to make use of the `fontWeight` attribute in Java code; though only for API Level 28 and above, I haven&#39;t found any analogs in the support library.

This is useful—and shows that the `fontWeight` attribute didn&#39;t serve any purpose in the past—but I would really like to be able to use the weight in XML styling. 


  [1]: https://developer.android.com/guide/topics/ui/look-and-feel/fonts-in-xml.html
  [2]: https://developer.android.com/reference/android/graphics/Typeface.html#create(android.graphics.Typeface,%20int)
  [3]: https://developer.android.com/reference/android/support/v4/content/res/ResourcesCompat.html
  [4]: https://developer.android.com/reference/android/graphics/Typeface.html#create(android.graphics.Typeface,%20int,%20boolean)
  [5]: https://developer.android.com/reference/android/graphics/Typeface.html#getWeight()

How to use specified weights for fonts in XML

I have a multi-line `EditText`:

    &lt;EditText 
        android:layout_gravity=&quot;center&quot;
        android:id=&quot;@+id/txtMessage&quot;
        android:layout_height=&quot;wrap_content&quot;
        android:layout_below=&quot;@+id/lblMessage&quot;
        android:layout_width=&quot;wrap_content&quot;
        android:width=&quot;250dip&quot;
        android:text=&quot;&quot;
        android:maxLength=&quot;760&quot;
        android:lines=&quot;4&quot;&gt;
    &lt;/EditText&gt;

Now the content is aligned to the middle. And I&#39;d like to have the content aligned to the top.

Is there a property to do that?


Vertical content align in Android EditText

Is it really intended that the Toolbar in a AppBarLayout is scrollable although the main container with the &quot;appbar_scrolling_view_behavior&quot; has not enough content to really scroll?

What I have tested so far:  
When I use a NestedScrollView (with &quot;wrap_content&quot; attribute) as main container and a TextView as child, the AppBarLayout works properly and does not scroll.

However, when I use a RecyclerView with only a few entries and the &quot;wrap_content&quot; attribute (so that there is no need to scroll), the Toolbar in the AppBarLayout is scrollable even though the RecyclerView never receives a scroll event (tested with a OnScrollChangeListener).

Here&#39;s my layout code:

    &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;
        android:id=&quot;@+id/coordinatorLayout&quot;
        android:layout_width=&quot;match_parent&quot;
        android:layout_height=&quot;match_parent&quot;&gt;

        &lt;android.support.design.widget.AppBarLayout
            android:id=&quot;@+id/appBarLayout&quot;
            android:layout_width=&quot;match_parent&quot;
            android:layout_height=&quot;wrap_content&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:layout_scrollFlags=&quot;scroll|enterAlways&quot;
                app:theme=&quot;@style/ToolbarStyle&quot; /&gt;
        &lt;/android.support.design.widget.AppBarLayout&gt;

        &lt;android.support.v7.widget.RecyclerView
            android:id=&quot;@+id/recycler&quot;
            android:layout_width=&quot;wrap_content&quot;
            android:layout_height=&quot;wrap_content&quot;
            app:layout_behavior=&quot;@string/appbar_scrolling_view_behavior&quot; /&gt;
    &lt;/android.support.design.widget.CoordinatorLayout&gt;

With the following effect that the toolbar is scrollable although it&#39;s not necessary:

[![][1]][1]

I&#39;ve also found a way to deal with this by checking if all RecyclerView items are visible and using the setNestedScrollingEnabled() method of the RecyclerView.  
Nevertheless, it does seem more like a bug as intended to me. Any opinions? :D

**EDIT #1:**
============
For people who are might be interested in my current solution, I had to put the setNestedScrollingEnabled() logic in the postDelayed() method of a Handler with 5 ms delay due to the LayoutManager which always returned -1 when calling the methods to find out whether the first and the last item is visible.  
I use this code in the onStart() method (after my RecyclerView has been initialized) and every time after a content change of the RecyclerView occurs.

    final LinearLayoutManager layoutManager = (LinearLayoutManager) mRecyclerView.getLayoutManager();
    new Handler().postDelayed(new Runnable() {
        @Override
        public void run() {
            //no items in the RecyclerView
            if (mRecyclerView.getAdapter().getItemCount() == 0)
                mRecyclerView.setNestedScrollingEnabled(false);
            //if the first and the last item is visible
            else if (layoutManager.findFirstCompletelyVisibleItemPosition() == 0
                    &amp;&amp; layoutManager.findLastCompletelyVisibleItemPosition() == mRecyclerView.getAdapter().getItemCount() - 1)
                mRecyclerView.setNestedScrollingEnabled(false);
            else
                mRecyclerView.setNestedScrollingEnabled(true);
        }
    }, 5);

**EDIT #2:**
============
I just played around with a new app and it seems that this (unintended) behavior has been fixed in support library version 23.3.0 (or even earlier). Thus, there is no need for workarounds anymore!

  [1]: http://i.stack.imgur.com/Wx1C2.gif

Toolbar in AppBarLayout is scrollable although RecyclerView has not enough content to scroll

I&#39;ve read the documentation about [Fragments][1] in the Android Developer Guide and I&#39;ve seen that sometimes they specify the class to instantiate with the Fragment tag attribute *android:name* and sometime they use the *class:* attribute:

    &lt;fragment
        android:name=&quot;com.example.news.ArticleReaderFragment&quot;
        android:id=&quot;@+id/viewer&quot;
        android:layout_weight=&quot;2&quot;
        android:layout_width=&quot;0dp&quot;
        android:layout_height=&quot;match_parent&quot; /&gt;

    &lt;fragment
        class=&quot;com.example.android.apis.app.FragmentLayout$TitlesFragment&quot;
        android:id=&quot;@+id/titles&quot; 
        android:layout_weight=&quot;1&quot;
        android:layout_width=&quot;0px&quot; 
        android:layout_height=&quot;match_parent&quot; /&gt;

Are *android:name* and *class:* interchangeable? If I use the autocompletion function in Eclipse, they both show the same documentation tip (i.e. the attribute provides the class name to be instantiated). Maybe you must use the second one when the class to be instantiated has a name which is different from the java file name, like *TitlesFragment* which is in the *FragmentLayout.java* file? Or can I use the syntax *package.fileDOTjava$Class* also with the *android:name* attribute?

I&#39;d like to have some documentation for XML tags and attributes as for Android Java Classes  (I&#39;ve asked about it in another [question][2]).


  [1]: http://developer.android.com/guide/topics/fundamentals/fragments.html
  [2]: https://stackoverflow.com/q/10162870/925001

Activity Layout: Fragment class: vs android:name attributes

I&#39;m trying to draw circle with the help of XML file in android, but circle is not displaying properly. Below code is showing Oval. How can I create circle in XML file.

    &lt;shape xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot;
        android:shape=&quot;oval&quot;&gt; 
        &lt;gradient
            android:startColor=&quot;#FFFF0000&quot;
            android:endColor=&quot;#80FF00FF&quot;
            android:angle=&quot;45&quot;/&gt;
        &lt;padding android:left=&quot;2dp&quot;
            android:top=&quot;2dp&quot;
            android:right=&quot;2dp&quot;
            android:bottom=&quot;2dp&quot; /&gt;
        &lt;corners android:radius=&quot;10dip&quot; /&gt;
    
    &lt;/shape&gt;

Any help would be appreciable.

How can I draw circle through XML Drawable - Android?

I already tried several answers I could find but none of them worked with the latest Facebook Android SDK version 4.0.

How can I change the layout height with the latest SDK?

How to change the height of the &#39;Log in with Facebook&#39; button?

I am using [Plurals][1] to simplify my code.  e.g., I used to have 
     
    &lt;string name=&quot;cat&quot;&gt;Cat&lt;/string&gt;
    &lt;string name=&quot;cats&quot;&gt;Cats&lt;/string&gt;

Using Plurals instead of multiple strings, I now have

	&lt;plurals name=&quot;cats&quot;&gt;
        &lt;item quantity=&quot;one&quot;&gt;Cat&lt;/item&gt;
        &lt;item quantity=&quot;other&quot;&gt;Cats&lt;/item&gt;
    &lt;/plurals&gt;

However, I used to retrieve strings to use as titles or summaries in my XML.
e.g.,

    android:title=&quot;@string/cats&quot;

Having removed that string in favor of a Plural, I am now unsure how to retrieve my string from XML.  I did make a naive attempt with

    android:title=&quot;@plurals/cats&quot;
but this just gives me `@1234567890` instead of `Cats` (or `Cat`).

Anyone know if it is possible to retrieve a string out of a Plural from XML?

  [1]: http://developer.android.com/guide/topics/resources/string-resource.html#Plurals

All Android Xml Solutions on Gang of Coders

Total of 27 Android Xml Solutions

Android Cannot resolve symbol '?attr/selectableItemBackground'