放大/缩小AbsoluteLayout上的图像Android

Question

我正在制作一个应用程序，其中有一个小玩具，左侧有一些礼服（ListView），您可以选择礼服。从该列表视图中，您只需选择一件连衣裙，连衣裙就会自动添加到视图中，现在我可以轻松拖动它，但无法放大/缩小。

下面是我的代码：

 mKittyBGLayer.setOnTouchListener(new OnTouchListener() { 
     public boolean onTouch(View v, MotionEvent event) { 
      for (ImageView img1 : mArrayList) { 
       if (kittyStatus == img1.getId()) { 
        mKittyDress = img1; 
        break; 
       } 
      } 
      if (mKittyDress != null) { 
       LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, (int) event.getX() 
         - mKittyDress.getWidth()/2, (int) event.getY() - mKittyDress.getHeight()/2); 
       mKittyDress.setLayoutParams(lp); 

       // Handle touch events here... 
       switch (event.getAction() & MotionEvent.ACTION_MASK) { 
       case MotionEvent.ACTION_DOWN: 
        savedMatrix.set(matrix); 
        start.set(event.getX(), event.getY()); 
        mode = DRAG; 
        break; 

       case MotionEvent.ACTION_POINTER_DOWN: 
        oldDist = spacing(event); 
        if (oldDist > 10f) { 
         savedMatrix.set(matrix); 
         midPoint(mid, event); 
         mode = ZOOM; 
        } 
        break; 

       case MotionEvent.ACTION_UP: 
       case MotionEvent.ACTION_POINTER_UP: 
        mode = NONE; 
        break; 
       case MotionEvent.ACTION_MOVE: 
        if (mode == DRAG) { 
         // ... 
         matrix.set(savedMatrix); 
         matrix.postTranslate(event.getX() - start.x, event.getY() - start.y); 
        } else if (mode == ZOOM) { 
         float newDist = spacing(event); 
         if (newDist > 10f) { 
          matrix.set(savedMatrix); 
          float scale = newDist/oldDist; 
          matrix.postScale(scale, scale, mid.x, mid.y); 
         } 
        } 
        break; 
       } 

       mKittyDress.setImageMatrix(matrix); 
       return true; // indicate event was handled 
      } 
      return true; 
     } 
    }); 


     /** Determine the space between the first two fingers */ 
private float spacing(MotionEvent event) { 
    float x = event.getX(0) - event.getX(1); 
    float y = event.getY(0) - event.getY(1); 
    return FloatMath.sqrt(x * x + y * y); 
} 

/** Calculate the mid point of the first two fingers */ 
private void midPoint(PointF point, MotionEvent event) { 
    float x = event.getX(0) + event.getX(1); 
    float y = event.getY(0) + event.getY(1); 
    point.set(x/2, y/2); 
} 

Answer 1

什么，我居然在这样的情况下完成的，是用一个WebView来显示图像。这给了用户缩放/滚动手势和惯性，它们与他们习惯的精确匹配。