ビューのスムーズドラッグ

Question

私は、ツールバー、ボトムメニュー（図と似ています）、および画面の右下にあるドラッグ可能なrelativeLayoutからなるアクティビティを幅と高さ= 500dpで持っています。

次のように私はそのrelativeLayoutにドラッグを実装している：

public void touchListenerPip(RelativeLayout relativeLayoutPIP) { 
    DisplayMetrics displayMetrics = new DisplayMetrics(); 
    getWindowManager().getDefaultDisplay().getMetrics(displayMetrics); 
    float screenHeight = displayMetrics.heightPixels; 
    float screenWidth = displayMetrics.widthPixels; 
    relativeLayoutPIP.setOnTouchListener(new View.OnTouchListener() { 
     @Override 
     public boolean onTouch(View view, MotionEvent event) { 
      float newX, newY; 
      switch (event.getActionMasked()) { 
       case MotionEvent.ACTION_DOWN: 
        dX = view.getX() - event.getRawX(); 
        dY = view.getY() - event.getRawY(); 
        lastAction = MotionEvent.ACTION_DOWN; 
        break; 

       case MotionEvent.ACTION_MOVE: 
        newX = event.getRawX() + dX; 
        newY = event.getRawY() + dY; 
        if ((newX <= 0 || newX >= screenWidth - view.getWidth()) || (newY <= 0 || newY >= screenHeight - view.getHeight())) { 
         lastAction = MotionEvent.ACTION_MOVE; 
         break; 
        } 
    //to block the view being dragged out of toolbar 
        if (newY < (float) toolbar.getHeight()) { 
         lastAction = MotionEvent.ACTION_MOVE; 
         break; 
        } 
     //to block the view being dragged out of bottombar 

        if (event.getRawY() + (float) view.getHeight() > screenHeight - (float) bottomBar.getHeight()) { 
         lastAction = MotionEvent.ACTION_MOVE; 
         break; 
        } 
        view.setX(newX); 
        view.setY(newY); 
        lastAction = MotionEvent.ACTION_MOVE; 
        break; 

       case MotionEvent.ACTION_UP: 
        if (lastAction == MotionEvent.ACTION_DOWN) 
         break; 

       default: 
        return false; 
      } 
      return true; 
     } 
    }); 
} 

ビューが細かいドラッグしていると、ドラッグが滑らかではありません。ビューの円滑なドラッグのための任意の提案？

Answer 1

は、それがスムーズにコードの下で動作するようになったとも、この[リンク]（http://www.androhub.com/android-drag-and-drop/をチェック

private final static float CLICK_DRAG_TOLERANCE = 10; // Often, there will be a slight, unintentional, drag when the user taps the view, so we need to account for this. 

private float downRawX, downRawY; 
private float dX, dY; 


public void touchListenerPip(RelativeLayout relativeLayoutPIP) { 
    relativeLayoutPIP.setOnTouchListener(new View.OnTouchListener() { 
     @Override 
     public boolean onTouch(View view, MotionEvent event) { 
      int action = event.getAction(); 
      if (action == MotionEvent.ACTION_DOWN) { 
       downRawX = event.getRawX(); 
       downRawY = event.getRawY(); 
       dX = view.getX() - downRawX; 
       dY = view.getY() - downRawY; 
       return true; 
      } else if (action == MotionEvent.ACTION_MOVE) { 
       int viewWidth = view.getWidth(); 
       int viewHeight = view.getHeight(); 

       View viewParent = (View) view.getParent(); 
       int parentWidth = viewParent.getWidth(); 
       int parentHeight = viewParent.getHeight(); 

       float newX = event.getRawX() + dX; 
       newX = Math.max(0, newX); // Don't allow the view past the left hand side of screen 
       newX = Math.min(parentWidth - viewWidth, newX); // Don't allow the view past the right hand side of screen 

       float newY = event.getRawY() + dY; 
       newY = Math.max(toolbar.getHeight(), newY); // Don't allow the view past the top of screen including toolbar 
       int bottomHeight = viewHeight + bottomBar.getHeight(); 
       newY = Math.min(parentHeight - bottomHeight, newY); // Don't allow the view past the bottom of screen including bottombar 

       view.animate() 
         .x(newX) 
         .y(newY) 
         .setDuration(0) 
         .start(); 

       return true; 

      } else if (action == MotionEvent.ACTION_UP) { 

       float upRawX = event.getRawX(); 
       float upRawY = event.getRawY(); 

       float upDX = upRawX - downRawX; 
       float upDY = upRawY - downRawY; 

       if (Math.abs(upDX) < CLICK_DRAG_TOLERANCE && Math.abs(upDY) < CLICK_DRAG_TOLERANCE) { // A click 
        viewClick(); 
        return true; 
       } else { // A drag 
        return true; 
       } 

      } 
      return true; 
     } 
    }); 
}