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I am having an issue with my Android app returning to the state it is in whenever it is launched whenever the screen is rotated. The app has several ImageButtons that change their image whenever clicked on, and I have music playing in the background on a loop. Whenever the screen is rotated though, the ImageButtons return to their default image even if they have been changed by the user touching them, and another instance of the music loop starts to play. How can I stop this from happening? I have no idea what to do about the ImageButtons. As for the music loop, I have tried using onStart(), but it continues to happen anyway, even if I use a boolean to check if it has already completed the tasks once.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my_activity);
}

@Override
protected void onStart() {
    if(firstRun)
    {
        super.onStart();
        mediaPlayer = MediaPlayer.create(this, R.raw.music);
        mediaPlayer.setLooping(true);
        mediaPlayer.start();
        firstRun = false;
    }
}
DaveTheMinion
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2 Answers2

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This is the classic behavior of android activities . Actually your app is not restarting but the Activity is restarting. You can use the solutions mentioned at :

How to avoid restarting activity when orientation changes on Android

I would also suggest you to get a solid grasp of the Activity LifeCyle to make sure u get in less trouble due to the quirky behaviour of Android Activities/Fragments.

Also, since you want to play music in the backround, try using a Service with a persistent notification in the task bar to make sure your app is not closed abruptly by Android.

Community
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Nilesh Pawar
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Add this line to your activity declaration in the Manifest.xml file

android:configChanges="keyboardHidden|screenSize|orientation"

like this:

<activity android:name=".YourActivity"
            android:configChanges="keyboardHidden|screenSize|orientation" />
blueware
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  • Okay, now does this setting deactivate the keyboard? It's not a problem for this app, but will be if I make an app that needs it? – DaveTheMinion Jun 15 '15 at 18:13