android - How to get screen width and height (size) in dp

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="#83daed"     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 In DP"         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; import android.content.Context; import android.view.WindowManager;   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.CYAN));          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 /*                     Context                         Interface to global information about an application environment.                         This is an abstract class whose implementation is provided by the                         Android system. It allows access to application-specific resources                         and classes, as well as up-calls for application-level operations                         such as launching activities, broadcasting and receiving intents, etc.                 */                  // Get the application context                 Context context = getApplicationContext();                  tv.setText("Screen width : " + getScreenWidthInDPs(context) + "dp");                 tv.setText(tv.getText() + "\nScreen height : "                         + getScreenHeightInDPs(context) + "dp");            }         });     }      // Custom method to get screen width in dp/dip using Context object     public static int getScreenWidthInDPs(Context context){         /*             DisplayMetrics                 A structure describing general information about a display,                 such as its size, density, and font scaling.         */         DisplayMetrics dm = new DisplayMetrics();          /*             WindowManager                 The interface that apps use to talk to the window manager.                 Use Context.getSystemService(Context.WINDOW_SERVICE) to get one of these.         */          /*             public abstract Object getSystemService (String name)                 Return the handle to a system-level service by name. The class of the returned                 object varies by the requested name. Currently available names are:                  WINDOW_SERVICE ("window")                     The top-level window manager in which you can place custom windows.                     The returned object is a WindowManager.         */          /*             public abstract Display getDefaultDisplay ()                  Returns the Display upon which this WindowManager instance will create new windows.                  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.                  Parameters                 outMetrics A DisplayMetrics object to receive the metrics.         */         WindowManager windowManager = (WindowManager) context.getSystemService(WINDOW_SERVICE);         windowManager.getDefaultDisplay().getMetrics(dm);         int widthInDP = Math.round(dm.widthPixels / dm.density);         return widthInDP;     }      // Custom method to get screen height in dp/dip using Context object     public static int getScreenHeightInDPs(Context context){         DisplayMetrics dm = new DisplayMetrics();         WindowManager windowManager = (WindowManager) context.getSystemService(WINDOW_SERVICE);         windowManager.getDefaultDisplay().getMetrics(dm);         /*             In this example code we converted the float value             to nearest whole integer number. But, you can get the actual height in dp             by removing the Math.round method. Then, it will return a float value, you should             also make the necessary changes.         */          /*             public int heightPixels                 The absolute height of the display in pixels.              public float density              The logical density of the display.         */         int heightInDP = Math.round(dm.heightPixels / dm.density);         return heightInDP;     } }
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