android - How to detect orientation change

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="#d9dbd4"     >     <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_landscape"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Set Orientation Landscape"         android:layout_below="@id/tv"         />     <Button         android:id="@+id/btn_portrait"         android:layout_width="wrap_content"         android:layout_height="wrap_content"         android:text="Set Orientation Portrait"         android:layout_below="@id/btn_landscape"         /> </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; import android.widget.TextView;   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_landscape = (Button) findViewById(R.id.btn_landscape);         simpulan Button btn_portrait = (Button) findViewById(R.id.btn_portrait);          ActionBar ab = getActionBar();         ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#FFEED207")));          btn_landscape.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Set screen orientation to landscape                 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);             }         });          btn_portrait.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 // Set screen orientation to portrait                 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);             }         });     }       /*         public void onConfigurationChanged (Configuration newConfig)             Called by the system when the device configuration changes while your activity             is running. Note that this will only be called if you have selected             configurations you would like to handle with the configChanges attribute             in your manifest. If any configuration change occurs that is not selected             to be reported by that attribute, then instead of reporting it the system will             stop and restart the activity (to have it launched with the new configuration).              At the time that this function has been called, your Resources object will             have been updated to return resource values matching the new configuration.              Parameters             newConfig : The new device configuration.     */     @Override     public void onConfigurationChanged(Configuration newConfig)     {         super.onConfigurationChanged(newConfig);          TextView tv = (TextView) findViewById(R.id.tv);          if(newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)         {             tv.setText("Screen orientation changed.");             tv.setText(tv.getText() + "\nOrientation : Landscape.");             tv.setTextColor(Color.RED);         }          if(newConfig.orientation == Configuration.ORIENTATION_PORTRAIT)         {             tv.setText("Screen orientation changed.");             tv.setText(tv.getText() + "\nOrientation : Portrait.");             tv.setTextColor(Color.BLUE);         }     } }
AndroidManifest.xml 
 <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.cfsuman.me.androidcodesnippets" >      <uses-permission android:name="android.permission.INTERNET" />      <application         android:allowBackup="true"         android:icon="@mipmap/ic_launcher"         android:label="@string/app_name"         android:theme="@style/AppTheme" >         <!--             android:configChanges="orientation|screenSize"                 This prevent restarting the activity when screen orientation change.         -->         <!--             public void onConfigurationChanged (Configuration newConfig)                 Called by the system when the device configuration changes while your                 activity is running. Note that this will only be called if you have                 selected configurations you would like to handle with the                 configChanges attribute in your manifest.                  So, we need to include orientation in android:configChanges,                 if we want to handle it in activity onConfigurationChanged event.         -->         <activity             android:name=".MainActivity"             android:label="@string/app_name"             android:configChanges="orientation|screenSize"             >             <intent-filter>                 <action android:name="android.intent.action.MAIN" />                 <category android:name="android.intent.category.LAUNCHER" />             </intent-filter>         </activity>     </application>  </manifest>

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