ImageView在丟棄後不可見

我對android很陌生，我試圖在onDragListener上實現演示，並且拖動工作正常，但拖動結束時imageView隱藏。我嘗試了很多選擇，但無法使其可見。而另外一部分是我創建的按鈕，點擊imageView ...
以下是我的代碼...ImageView在丟棄後不可見

public class MainActivity extends Activity { 
Button b1,b2; 
FrameLayout f; 
ImageView imageview; 
private View selected_item = null; 
private boolean dragging = false; 
private static final int START_DRAGGING = 0; 
private static final int STOP_DRAGGING = 1; 
private int status; 
private LinearLayout m_llTop; 
private float oldXvalue; 
private float oldYvalue; 
RelativeLayout layout; 
int x; 
int y; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    captureImageInitialization(); 
    b1=(Button)findViewById(R.id.button1); 
    b2=(Button)findViewById(R.id.button2); 
    f=(FrameLayout)findViewById(R.id.framelayout); 

    b1.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v){ 

      layout=new RelativeLayout(getBaseContext()); 
      //layout.setOrientation(LinearLayout.VERTICAL); 
      imageview=new ImageView(getBaseContext()); 
      final TextView tv=new TextView(getBaseContext()); 
      /*TextView tv1=new TextView(getBaseContext()); 
      TextView tv2=new TextView(getBaseContext()); 
      TextView tv3=new TextView(getBaseContext()); 
      TextView tv4=new TextView(getBaseContext());*/ 
      RelativeLayout.LayoutParams ivparams = new RelativeLayout.LayoutParams(
        100,100); 
      RelativeLayout.LayoutParams tvparams = new RelativeLayout.LayoutParams(
        RelativeLayout.LayoutParams.WRAP_CONTENT, 
        RelativeLayout.LayoutParams.WRAP_CONTENT); 
      ivparams.setMargins(0,0,10,0); 
      imageview.setId(1); 
      registerForContextMenu(imageview); 
      imageview.setOnTouchListener(new OnTouchListener() { 

      @Override 
      public boolean onTouch(View view, MotionEvent me) { 

       if (me.getAction() == MotionEvent.ACTION_DOWN) { 
        DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view); 
        view.startDrag(null, shadowBuilder, view, 0); 
        view.setVisibility(View.INVISIBLE); 
        return true; 
       }else { 
        return false; 
       } 

      } 
     }); 

      imageview.setBackgroundResource(R.drawable.ic_launcher); 
      imageview.setLayoutParams(ivparams); 

      imageview.getRootView().setOnDragListener(new OnDragListener() { 

       @Override 
       public boolean onDrag(View v, DragEvent event) { 
        View view = (View) event.getLocalState(); 
        switch (event.getAction()) { 
        case DragEvent.ACTION_DROP: 

        float X = event.getX(); 
        float Y = event.getY(); 

        view.setX(X-(imageview.getWidth()/2)); 
        view.setY(Y-(imageview.getHeight()/2)); 
        view.setVisibility(View.VISIBLE); 
        break; 
        case DragEvent.ACTION_DRAG_EXITED: 

          view.setVisibility(View.VISIBLE); 
          break; 
        case DragEvent.ACTION_DRAG_ENDED: 
          if(dropEventNotHandled(event)){ 
           view.setVisibility(View.INVISIBLE); 
          } 

         break; 

       default: 
        break; 
       } 
       return true; 
       } 
      }); 
      registerForContextMenu(tv); 
      layout.addView(imageview); 
      layout.addView(tv); 
      f.addView(layout); 
      } 
     }); 

} 
private boolean dropEventNotHandled(DragEvent dragEvent) { 
    return !dragEvent.getResult(); 
} 

}

來源

2014-02-18 Akshay

你爲什麼在'onTouch（）'裏面使用'view.setVisibility（View.INVISIBLE)'？ – SMR

用view.setVisibility（View.VISIBLE）寫入動作的條件; – San

你需要添加新的佈局到你的圖像相同的佈局 – Wannabe

添加到您的代碼：

f.addView(imageview); 
f.addView(layout);

我認爲這會做技巧

來源

2014-02-18 10:52:22 Wannabe

ImageView在丟棄後不可見

回答

相關問題