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="#e4e8ff" > <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="Change Screen Orientation" android:layout_below="@id/tv" /> </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; import java.util.Random; 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); Random rand = new Random(); simpulan int randomNumber = rand.nextInt(100); ActionBar ab = getActionBar(); ab.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#6da5eb"))); btn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Get the activity Activity activity = MainActivity.this; if(getScreenOrientation(activity) == "Landscape") { /* public void setRequestedOrientation (int requestedOrientation) Change the desired orientation of this activity. If the activity is currently in the foreground or otherwise impacting the screen orientation, the screen will immediately be changed (possibly causing the activity to be restarted). Otherwise, this will be used the next time the activity is visible. Parameters requestedOrientation An orientation constant as used in ActivityInfo.screenOrientation. */ /* 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. */ setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); /* If the activity restarted after changing the screen orientation, then this random number will change. If the screen orientation changed without restarting the activity, then this random number will not change when we change the screen orientation. Even we can't see the new text on TextView, if the activity restarted after screen orientation change. */ tv.setText("Random Number : " + randomNumber); tv.setText(tv.getText() + "\nScreen orientation changed."); tv.setTextColor(Color.RED); } else if (getScreenOrientation(activity) == "Portrait") { tv.setText("Random Number : " + randomNumber); tv.setText(tv.getText() + "\nScreen orientation changed."); tv.setTextColor(Color.BLUE); // 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; } } 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 Lists configuration changes that the activity will handle itself. When a configuration change occurs at runtime, the activity is shut down and restarted by default, but declaring a configuration with this attribute will prevent the activity from being restarted. Instead, the activity remains running and its onConfigurationChanged() method is called. Multiple values are separated by '|' — for example, "locale|navigation|orientation". orientation The screen orientation has changed — the user has rotated the device. Note: If your application targets API level 13 or higher (as declared by the minSdkVersion and targetSdkVersion attributes), then you should also declare the "screenSize" configuration, because it also changes when a device switches between portrait and landscape orientations. screenSize The current available screen size has changed. This represents a change in the currently available size, relative to the current aspect ratio, so will change when the user switches between landscape and portrait. However, if your application targets API level 12 or lower, then your activity always handles this configuration change itself (this configuration change does not restart your activity, even when running on an Android 3.2 or higher device). --> <!-- android:configChanges="orientation|screenSize" This prevent restarting the activity when screen orientation change. --> <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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