Detect Orientation Changes And Control The Orientation Of The Activity

import android.view.Display;
import android.view.WindowManager;
@Override
public void onCreate(Bundle bundle)
{
Super.onCreate(bundle);
setContentView(R.layout.main);
//-----------Get the current display information------
WindowManager wm = getWindowManager();
Display display = wm.getDefaultDisplay();
If (d.getWidth() > d.getHeight()) {
Log.d(“Orientation is in ”, “Landscape mode”);
}
Else
{
Log.d(“Orientation is in ”, “Portrait mode”);
}
}

Sometimes you want to ensure that your application is displayed in only a certain orientation. For example, you may be writing a game that should be viewed only in landscape mode. In this case, you must programmatically force a change in the orientation, using the setRequestOrientation() method of the Activity class.

Import android.content.pm.ActivityInfo;
@Override
public void onCreate(Bundle bundle)
{
Super.onCreate(bundle);
setContentView(R.layout.main);
//-----------Get the current display information------
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}

If you want to change to portrait mode, use the ActivityInfo.SCREEN_ORIENTATION_PORTRAIT constraint. Apart from the method given , you can also use the android:screenOrientation attribute on the <activity> element in the AndroidManifest.xml as follows to constrain the activity to a certain orientation.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.administrator.orientationapp" >
<uses-sdk android:minSdkVersion=”18”/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:screenOrientation="landscape"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

The preceding example constrains the activity to a certain orientation (landscape in this case) and prevents the activity from being destroyed. The activity will not be destroyed and the onCreate() method will be fired again when the orientation of the device changes.

Conclusion

In this article, you learned how to detect the orientation changes and control the orientation of the activity. In the next article, I will explain about utilizing the Action Bar.

Introduction

Conclusion