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POProblem with getLastNonConfigurationInstance() - Seems to only ever return null
 

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  1. POProblem with getLastNonConfigurationInstance() - Seems to only ever return null
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    <pre><code>public class XPBN extends Activity{ private Map _map; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); final Map data = (Map)getLastNonConfigurationInstance(); if (data == null) { Toast.makeText(this, "New Map", Toast.LENGTH_SHORT).show(); _map = new Map(this); } else { Toast.makeText(this, "Old Map", Toast.LENGTH_SHORT).show(); _map = (Map)data; } setContentView(_map); } @Override public Object onRetainNonConfigurationInstance() { Toast.makeText(this, "Saving Configuration...", Toast.LENGTH_LONG).show(); return _map; } } </code></pre> <p>I am going to suppose that the title I gave this forum-thread states the problem I am experiencing pretty thoroughly. I have also edited the code to try to save a string object and then recover the string object through the getLastNonConfigurationInstance(), just to see to what extent I could get it to work for me, but it still seemed to return null. I have not tried calling it from onStart() or onRestart() or onResume(), but from what I have read, it is usually only called from onCreate(Bundle) anyways. This has got me really confused... :/</p> <p>I figured it may be of some help to know a little about my Map class object, so here's (some of) the code from it:</p> <pre><code>public class Map extends SurfaceView implements SurfaceHolder.Callback{ private MapThread _mapThread; private int _terrain[][]; private ArrayList&lt;Player&gt; playerList; private Bitmap _blueback; private Bitmap _bluefront; private Bitmap _blueleft; private Bitmap _blueright; private Bitmap _greenback; private Bitmap _greenfront; private Bitmap _greenleft; private Bitmap _greenright; private Bitmap _redfront; private Bitmap _redback; private Bitmap _redleft; private Bitmap _redright; private Bitmap _robot1; private Bitmap _forest; private Bitmap _grass; private Bitmap _mountain; private Bitmap _tree; @SuppressWarnings("unused") private boolean _mapLoaded = false; private int _viewX = 0; private int _viewY = 0; Map(Context context){ super(context); getHolder().addCallback(this); _mapThread = new MapThread(this); setFocusable(true); _terrain = new int[100][100]; playerList = new ArrayList&lt;Player&gt;(); addPlayer(0, 0, 0); _blueback = BitmapFactory.decodeResource(context.getResources(), R.drawable.blueback); _bluefront = BitmapFactory.decodeResource(context.getResources(), R.drawable.bluefront); _blueleft = BitmapFactory.decodeResource(context.getResources(), R.drawable.blueleft); _blueright = BitmapFactory.decodeResource(context.getResources(), R.drawable.blueright); _greenback = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenback); _greenfront = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenfront); _greenleft = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenleft); _greenright = BitmapFactory.decodeResource(context.getResources(), R.drawable.greenright); _redback = BitmapFactory.decodeResource(context.getResources(), R.drawable.redback); _redfront = BitmapFactory.decodeResource(context.getResources(), R.drawable.redfront); _redleft = BitmapFactory.decodeResource(context.getResources(), R.drawable.redleft); _redright = BitmapFactory.decodeResource(context.getResources(), R.drawable.redright); _robot1 = BitmapFactory.decodeResource(context.getResources(), R.drawable.robot1); _forest = BitmapFactory.decodeResource(context.getResources(), R.drawable.forest); _grass = BitmapFactory.decodeResource(context.getResources(), R.drawable.grass); _mountain = BitmapFactory.decodeResource(context.getResources(), R.drawable.mountain); _tree = BitmapFactory.decodeResource(context.getResources(), R.drawable.tree); TouchScreenHandler handler = new TouchScreenHandler(); // This includes 2 other nested-class threads this.setOnTouchListener(handler); } </code></pre> <p>Perhaps there lies something in the complexity of the Object returned by onRetainNonConfigurationInstance() that might be contributing to my problems?</p> <p>Or lastly is there something (like a Activity or Application property) in my Manifest.xml file that is the problem?</p> <p>If any further information is required, please let me know, as I will be checking back on this post frequently until I can get past this little bump in the road.<br> PS: I have this problem with both ADB and my device.<br> PSS: most importantly, a big THANKS to this community for the help and support, as it is greatly appreciated! :D</p>
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    1. COHow are you testing the behavior of your `onRetainNonConfigurationInstance()`?
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    2. COif (getLastNonConfigurationInstance() == null) { is that correct?
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