Essential Books

Lock Screens rotation programmatically

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It is very common that during development, one may find very useful to lock/unlock the device screen during specific parts of the code.

For instance, while showing a Dialog with information, the developer might want to lock the screen’s rotation to prevent the dialog from being dismissed and the current activity from being rebuilt to unlock it again when the dialog is dismissed.

Even though we can achieve rotation locking from the manifest by doing : 

<activity
    android:name=".TheActivity"
    android:screenOrientation="portrait"
    android:label="@string/app_name" >
</activity>

One can do it programmatically as well by doing the following : 

public void lockDeviceRotation(boolean value) {
    if (value) {
        int currentOrientation = getResources().getConfiguration().orientation;
        if (currentOrientation == Configuration.ORIENTATION_LANDSCAPE) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
        } else {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);
        }
    } else {
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_USER);
        } else {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
        }
    }
}

And then calling the following, to respectively lock and unlock the device rotation 

lockDeviceRotation(true)

and 

lockDeviceRotation(false)
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Orientation Changes:
* Orientation Changes
* Saving and Restoring Activity State
* Retaining Fragments
* Manually Managing Configuration Changes
* Handling AsyncTask
* Saving and Restoring Fragment State
* Lock Screens rotation programmatically
* Locking Screen Orientation
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