android - How to change screen orientation

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="#e7ebcb"     >     <Button         android:id="@+id/btn"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Change Screen Orientation"         /> </RelativeLayout>
MainActivity.java 
 package com.cfsuman.me.androidcodesnippets;  import android.app.ActionBar; import android.content.pm.ActivityInfo; 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.content.res.Configuration;   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         jawaban RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl);         jawaban Button btn = (Button) findViewById(R.id.btn);          ActionBar ab = getActionBar();         ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FFA0A38B")));          btn.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Get the activity                 Activity activity = MainActivity.this;                  if(getScreenOrientation(activity) == "Landscape")                 {                     /*                         ActivityInfo                             Information you can retrieve about a particular application activity                             or receiver. This corresponds to information collected from the                             AndroidManifest.xml's <activity> and <receiver> tags.                     */                      /*                         public static jawaban int SCREEN_ORIENTATION_PORTRAIT                             Constant corresponding to portrait in the screenOrientation attribute.                             Constant Value: 1 (0x00000001)                     */                      /*                         public static jawaban int SCREEN_ORIENTATION_LANDSCAPE                             Constant corresponding to landscape in the screenOrientation attribute.                             Constant Value: 0 (0x00000000)                     */                     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);                 }                 else if (getScreenOrientation(activity) == "Portrait")                 {                     // Change the screen orientation to landscape                     setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);                 }             }         });     }      // Custom method to get screen current orientation     public static String getScreenOrientation(Activity activity) {         String orientation = "";         int currentOrientation = activity.getResources().getConfiguration().orientation;          if (currentOrientation == Configuration.ORIENTATION_LANDSCAPE) {             orientation = "Landscape";         }          if (currentOrientation == Configuration.ORIENTATION_PORTRAIT) {             orientation = "Portrait";         }          return orientation;     } }

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