Android的阻力和ICS中的圖片崩潰（4.0.3）

Question

我的應用程序做什麼是很簡單：

它顯示上一個GridView 的SD卡和角落的圖標所有圖像的縮略圖這些縮略圖讓用戶可以觸摸它來啓動 拖動圖像的陰影。

該陰影可以放在已經設置了拖動監聽器的視圖上。當 發生時，新的意圖將被調用，圖像文件路徑Uri將作爲 新意圖的額外內容。到現在爲止還挺好。

問題發生在我開始在沒有任何 拖動監聽器的視圖上放下陰影時，最終會凍結屏幕並使移動設備崩潰！

所有我在堆棧跟蹤得到的是這樣的：

03-29 14:24:14.803: I/ViewRootImpl(2496): Reporting drop result: false 
03-29 14:24:14.803: W/WindowManager(274): Drag is in progress but there is no drag window handle. 
03-29 14:24:15.062: I/ViewRootImpl(2496): Reporting drop result: false 
03-29 14:24:15.062: W/WindowManager(274): Drag is in progress but there is no drag window handle. 
03-29 14:24:15.294: I/ViewRootImpl(2496): Reporting drop result: false 
03-29 14:25:06.972: I/Process(274): Sending signal. PID: 274 SIG: 3 
03-29 14:25:06.972: I/dalvikvm(274): threadid=3: reacting to signal 3 
03-29 14:25:07.092: I/dalvikvm(274): Wrote stack traces to '/data/anr/traces.txt' 
03-29 14:25:10.012: W/ActivityManager(274): Timeout of broadcast BroadcastRecord{2c09ce28 android.intent.action.TIME_TICK} - receiver=android.app.LoadedApk$ReceiverDispatcher$InnerReceiver@2bf0c4e8, started 10009ms ago 
03-29 14:25:10.012: W/ActivityManager(274): Receiver during timeout: BroadcastFilter{2bf0cd08 ReceiverList{2bf0c660 274 system/1000 local:2bf0c4e8}} 
03-29 14:25:20.022: W/ActivityManager(274): Timeout of broadcast BroadcastRecord{2c09ce28 android.intent.action.TIME_TICK} - receiver=android.app.LoadedApk$ReceiverDispatcher$InnerReceiver@2bef04e8, started 10008ms ago 
03-29 14:25:20.022: W/ActivityManager(274): Receiver during timeout: BroadcastFilter{2bef0760 ReceiverList{2bef06e8 274 system/1000 local:2bef04e8}} 
03-29 14:25:37.092: W/Watchdog(274): WATCHDOG PROBLEM IN SYSTEM SERVER: com.android.server.wm.WindowManagerService 
03-29 14:25:37.102: I/Process(274): Sending signal. PID: 274 SIG: 3 
03-29 14:25:37.102: I/dalvikvm(274): threadid=3: reacting to signal 3 
03-29 14:25:37.182: I/dalvikvm(274): Wrote stack traces to '/data/anr/traces.txt' 
03-29 14:25:37.192: I/Process(274): Sending signal. PID: 475 SIG: 3 
03-29 14:25:37.192: I/dalvikvm(475): threadid=3: reacting to signal 3 
03-29 14:25:37.202: I/dalvikvm(475): Wrote stack traces to '/data/anr/traces.txt' 
03-29 14:25:39.204: I/Watchdog_N(274): dumpKernelStacks 
03-29 14:25:39.492: I/CrashMonitor(1186): CrashMonitorService: invokeService: android.intent.action.DROPBOX_ENTRY_ADDED 
03-29 14:25:39.492: W/Watchdog(274): *** WATCHDOG KILLING THE SYSTEM: com.android.server.wm.WindowManagerService 

我的適配器類（其中i執行view.startDrag（）方法）：

public class ImageCursorAdapter extends CursorAdapter { 

    private LayoutInflater mInflater; 
    private final static int mImageColumnID = 0; 
    private Options mOptions = new Options();; 
    private Cursor mCursor; 

    public ImageCursorAdapter(Context context, Cursor c) { 
     super(context, c); 

     mInflater = LayoutInflater.from(context); 
     mOptions.inSampleSize = 4; 
    } 

    @Override 
    public void bindView(View view, Context context, Cursor cursor) { 
     mCursor = cursor; 
     ViewHolder holder = (ViewHolder) view.getTag(); 
     ImageThumbnailLoader imageLoader = new ImageThumbnailLoader(
      holder.thumbImg, cursor.getLong(mImageColumnID), 
      context.getContentResolver(), false); 
     imageLoader.execute(); 
//  holder.thumbImg.setImageBitmap(MediaStore.Images.Thumbnails.getThumbnail(
//     context.getContentResolver(), cursor.getLong(mColumnID), 
//     MediaStore.Images.Thumbnails.MICRO_KIND, mOptions)); 
     holder.dragImg.setTag(holder.thumbImg); 
     holder.dragImg.setId(cursor.getPosition()); 
     holder.dragImg.setOnTouchListener(new OnTouchListener() { 

      @Override 
      public boolean onTouch(View v, MotionEvent event) { 
       int action = event.getAction(); 
       if (action == MotionEvent.ACTION_DOWN) { 
        mCursor.moveToPosition(v.getId()); 
        int dataColumn = mCursor.getColumnIndex(MediaStore.Images.Media.DATA); 
        ClipData dragData = ClipData.newPlainText("filename", 
         mCursor.getString(dataColumn)); 
        DragShadowBuilder shadow = new DragShadowBuilder((View) v.getTag()); 
        return v.startDrag(dragData, shadow, null, 0); 
       } 
       return false; 
      } 
     }); 
     Log.i("Prototype", "bindView : " + cursor.getPosition()); 
    } 

    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup parent) { 
     Log.i("Prototype", "newView : " + cursor.getPosition()); 
     View view = mInflater.inflate(R.layout.grid_item, null); 
     ViewHolder holder = new ViewHolder(view); 
     view.setTag(holder); 
     return view; 
    } 


    private static class ViewHolder { 
     ImageView thumbImg, dragImg; 

     ViewHolder(View base) { 
      thumbImg = (ImageView) base.findViewById(R.id.thumbImage); 
      dragImg = (ImageView) base.findViewById(R.id.dragImage); 
     } 
    } 

} 

任何想法/上what`線索在這裏呢？我真的很感激這一點。

在此先感謝。

Answer 1

如果在'onDrag（View v，DragEvent event）'方法中有switch case語句，那麼您應該在那裏添加'DragEvent.ACTION_DRAG_LOCATION'的情況。在那裏你可以定義，如果你的圖標/圖像放置在非拖動字段上會發生什麼。

下面是一個例子：

public class MyDragListener implements OnDragListener { 

    @Override 
    public boolean onDrag(View v, DragEvent event) { 
    int action = event.getAction(); 
    switch (action) { 
    case DragEvent.ACTION_DRAG_STARTED: 
     break; 
    case DragEvent.ACTION_DRAG_ENTERED: 
     break; 
    case DragEvent.ACTION_DRAG_EXITED: 
     break; 
    case DragEvent.ACTION_DROP: 
     View view = (View) event.getLocalState(); 
     ViewGroup owner = (ViewGroup) view.getParent(); 
     owner.removeView(view); 
     RelativeLayout container = (RelativeLayout) v; 
     container.addView(view); 
     view.setVisibility(View.VISIBLE); 
     break; 
    case DragEvent.ACTION_DRAG_ENDED: 
        break; 
    case DragEvent.ACTION_DRAG_LOCATION: 
     view.setVisibility(View.VISIBLE); 
     break; 
    } 
    } 

} 

Answer 2

我遇到在一個類似的問題，我不想佈局接受拖放操作。

通過setOnDragListener將一個拖拽監聽器附加到您的視圖。

view.setOnDragListener（new MyDragListener（））;

檢查onDrag事件中的目標視圖是否爲您需要的視圖。如果條件不成立，請將您想要的代碼放在那裏。

class MyDragListener implements OnDragListener { 

@Override 
public boolean onDrag(View v, DragEvent event) { 

    switch (event.getAction()) { 
    case case DragEvent.ACTION_DROP: 
     //check whether it has not been dropped onto your view 
      if(v!=view) 
       //your code here 
}