拖放完成后拖放视图不可见

我正在测试拖放功能在我的应用程序我有相对布局，其中包含两个文本视图这两个文本视图可以从他们的初始位置拖放到任何地方在布局拖放完成后拖放视图不可见

当我拖累他们能够在屏幕上任意位置拖动，但如果我离开的看法砸任何地方，他们没有更多的可见文本视图

我用OnTouchListener（）和OnDragListener （）on textviews

帮我解决这个问题

我的活动

public class MainActivity extends Activity 
{ 
private TextView tv1, tv2; 
LayoutParams lParams; 
private static final String msg = "DRAG EVENT TESTING"; 


@Override 
protected void onCreate(Bundle savedInstanceState) 
{ 
    // TODO: Implement this method 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    tv1 = (TextView) findViewById(R.id.bigTV); 
    tv2 = (TextView) findViewById(R.id.smallTv); 

    tv1.setOnTouchListener(new MyTouchListener()); 
    tv2.setOnTouchListener(new MyTouchListener()); 

    tv1.setOnDragListener(new MyDragListener()); 
    tv2.setOnDragListener(new MyDragListener()); 

} 

private class MyTouchListener implements OnTouchListener 
{ 

    @Override 
    public boolean onTouch(View v, MotionEvent event) 
    { 


     ClipData dragData = ClipData.newPlainText("",""); 

     View.DragShadowBuilder shdwbldr = new View.DragShadowBuilder(v); 
     v.startDrag(dragData, shdwbldr, v, 0); 
     v.setVisibility(View.INVISIBLE); 
     return true; 
    } 


} 

private class MyDragListener implements OnDragListener 
{ 

    @Override 
    public boolean onDrag(View v, DragEvent event) 
    { 
     switch(event.getAction()){ 
      case DragEvent.ACTION_DRAG_STARTED: 
       lParams = (RelativeLayout.LayoutParams)v.getLayoutParams(); 
       Log.d(msg, "Action is DragEvent.ACTION_DRAG_STARTED"); 


       break; 

      case DragEvent.ACTION_DRAG_ENTERED: 
       Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENTERED"); 
       int x_cord = (int) event.getX(); 
       int y_cord = (int) event.getY(); 
       break; 

      case DragEvent.ACTION_DRAG_EXITED : 
       Log.d(msg, "Action is DragEvent.ACTION_DRAG_EXITED"); 
       x_cord = (int) event.getX(); 
       y_cord = (int) event.getY(); 
       lParams.leftMargin = x_cord; 
       lParams.topMargin = y_cord; 
       v.setLayoutParams(lParams); 
       break; 

      case DragEvent.ACTION_DRAG_LOCATION : 
       Log.d(msg, "Action is DragEvent.ACTION_DRAG_LOCATION"); 
       x_cord = (int) event.getX(); 
       y_cord = (int) event.getY(); 
       break; 

      case DragEvent.ACTION_DROP: 
       Log.d(msg, "ACTION_DROP event"); 


       break; 
      case DragEvent.ACTION_DRAG_ENDED : 
       Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENDED"); 

       // Do nothing 
       break; 


      default: break; 
     } 
     return true; 
    } 


} 

     }

我在布局上ACTION_DROP事件相应的坐标

<?xml version="1.0" encoding="utf-8"?> 
    <RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_height="match_parent" 
android:layout_width="match_parent"> 

<TextView 
    android:id="@+id/bigTV" 
    android:layout_height="wrap_content" 
    android:text="Drag Me" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:layout_width="wrap_content"/> 

<TextView 
    android:id="@+id/smallTv" 
    android:layout_height="wrap_content" 
    android:text="Drag me too but slowly!" 
    android:textAppearance="?android:attr/textAppearanceMedium" 
    android:layout_width="wrap_content" 
    android:layout_below="@id/bigTV"/> 

     </RelativeLayout>

来源

2016-05-31 user5894647

移动文本视图。

来源

2016-05-31 15:50:55

拖放完成后拖放视图不可见

回答

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