android - How to get screen size

activity_main.xml 
 <RelativeLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/rl"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:padding="10dp"     tools:context=".MainActivity"     android:background="#fff9dc"     android:animateLayoutChanges="true"     >     <TextView         android:id="@+id/tv"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:fontFamily="Sans-Serif-Condensed"         android:textSize="18dp"         android:textStyle="italic"         android:textColor="#000000"         android:padding="15dp"         />     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Get Screen Size"         android:layout_below="@id/tv"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.app.ActionBar; import android.graphics.Color; import android.graphics.drawable.ColorDrawable; import android.os.Bundle; import android.app.Activity; import android.view.View; import android.widget.Button;  import android.widget.RelativeLayout; import android.widget.TextView; import android.util.DisplayMetrics;    public class MainActivity extends Activity {      protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);          // Get the widgets reference from XML layout         simpulan RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         simpulan Button btn = (Button) findViewById(R.id.btn);         simpulan TextView tv = (TextView) findViewById(R.id.tv);          ActionBar ab = getActionBar();         ab.setBackgroundDrawable(new ColorDrawable(Color.YELLOW));          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                  Activity activity = MainActivity.this;                 tv.setText("Screen width : " + getScreenWidthInPixels(activity) + "pixels");                 tv.setText(tv.getText() + "\nScreen height : "                         + getScreenHeightInPixels(activity) + "pixels");            }         });      }      // Custom method to get android device screen width in pixels     public static int getScreenWidthInPixels(Activity activity){         /*             DisplayMetrics                 A structure describing general information about a display,                 such as its size, density, and font scaling.         */         DisplayMetrics dm  = new DisplayMetrics();         /*             public WindowManager getWindowManager ()                 Retrieve the window manager for showing custom windows.         */          /*             WindowManager                 The interface that apps use to talk to the window manager.                 Use Context.getSystemService(Context.WINDOW_SERVICE) to get one of these.                 Each window manager instance is bound to a particular Display.         */          /*             public abstract Display getDefaultDisplay ()                  Returns the Display upon which this WindowManager instance will create new windows.                  Despite the name of this method, the display that is returned is not necessarily                 the primary display of the system (see DEFAULT_DISPLAY). The returned display                 could instead be a secondary display that this window manager instance                 is managing. Think of it as the display that this WindowManager instance uses by default.                  To create windows on a different display, you need to obtain a WindowManager                 for that Display. (See the WindowManager class documentation for more information.)                  Returns                 The display that this window manager is managing.         */          /*             public void getMetrics (DisplayMetrics outMetrics)                  Gets display metrics that describe the size and density of this display.                  The size is adjusted based on the current rotation of the display.                  The size returned by this method does not necessarily represent the actual                 raw size (native resolution) of the display. The returned size may be adjusted                 to exclude certain system decor elements that are always visible. It may also                 be scaled to provide compatibility with older applications that were                 originally designed for smaller displays.                  Parameters                 outMetrics A DisplayMetrics object to receive the metrics.         */         activity.getWindowManager().getDefaultDisplay().getMetrics(dm);          /*             public int widthPixels                 The absolute width of the display in pixels.         */         int width = dm.widthPixels;         return width;     }      // Custom method to get android device screen height in pixels     public static int getScreenHeightInPixels(Activity activity){         DisplayMetrics dm = activity.getResources().getDisplayMetrics();         activity.getWindowManager().getDefaultDisplay().getMetrics(dm);          /*             public int heightPixels                 The absolute height of the display in pixels.         */         int height = dm.heightPixels;         return height;     } }
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