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;
}
}
我打算假设我给这个论坛线程的标题说明了我正在经历的问题非常彻底。我还编辑了代码,尝试保存一个字符串对象,然后通过getLastNonConfigurationInstance()恢复字符串对象,只是为了了解我能在多大程度上为我工作,但它似乎仍然返回null。我没有尝试从onStart()或onRestart()或onResume()调用它,但从我读过的内容来看,它通常只能从onCreate(Bundle)调用。这让我真的很困惑...:/getLastNonConfigurationInstance问题 - 似乎只返回null
我想这可能是一些帮助来了解一些关于我的地图类对象,所以这里的(一些),从它的代码:
public class Map extends SurfaceView implements SurfaceHolder.Callback{
private MapThread _mapThread;
private int _terrain[][];
private ArrayList<Player> 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<Player>();
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);
}
也许在onRetainNonConfigurationInstance()返回的Object的复杂性中存在一些可能会导致我的问题的东西?
最后还是在我的Manifest.xml文件中存在某些问题(如Activity或Application属性)?
如果需要更多信息,请让我知道,因为我会经常检查这个帖子,直到我能在路上经过这个小颠簸。
PS:我对亚行和我的设备都有这个问题。
PSS:最重要的是,非常感谢这个社区的帮助和支持,因为它非常感谢! :D
你如何测试你的'onRetainNonConfigurationInstance()'的行为? – CommonsWare 2010-09-28 21:43:38
if(getLastNonConfigurationInstance()== null){ 是否正确? – sduffy89 2010-09-28 22:45:54