Question

我有一个捏和缩放图像视图的任务，我已经制作了一个应用程序，我正在刷图像，它工作正常;现在我想在同一个类上捏合和缩放imageview;但是我无法做到这一点。我已经经历了各种各样的例子，但在这种情况下似乎没有任何帮助。下面是我的代码，或者提供给我另一个例子对于这个问题。

imageView.setOnTouchListener(new OnTouchListener() {        
        @Override
 public boolean onTouch(View view, MotionEvent event) { 
 bitmap = BitmapFactory.decodeResource(context.getResources(), image_id[position]);
  bmpWidth = bitmap.getWidth();
  bmpHeight = bitmap.getHeight();
  distCurrent = 1; 
  dist0 = 1;
  drawMatrix();
  float distx, disty;
   switch(event.getAction() & MotionEvent.ACTION_MASK){
   case MotionEvent.ACTION_DOWN:
    //A pressed gesture has started, the motion contains the initial starting location. 
    touchState = TOUCH;
    break;
   case MotionEvent.ACTION_POINTER_UP:
        //A non-primary pointer has gone up. 
        touchState = TOUCH;
        break;
   case MotionEvent.ACTION_POINTER_DOWN:
    //A non-primary pointer has gone down. 
    touchState = PINCH;

    //Get the distance when the second pointer touch
    distx = event.getX(0) - event.getX(1);
    disty = event.getY(0) - event.getY(1);
    dist0 = FloatMath.sqrt(distx * distx + disty * disty);

    break;
   case MotionEvent.ACTION_MOVE:
    //A change has happened during a press gesture (between ACTION_DOWN and ACTION_UP).

    if(touchState == PINCH){      
     //Get the current distance
     distx = event.getX(0) - event.getX(1);
     disty = event.getY(0) - event.getY(1);
     distCurrent = FloatMath.sqrt(distx * distx + disty * disty);

     drawMatrix();
    }

    break;
   case MotionEvent.ACTION_UP:
    //A pressed gesture has finished.
    touchState = IDLE;
    break;
   }
  touchState = IDLE;
            return true;
        }
    });





private void drawMatrix(){
     float curScale = distCurrent/dist0;
     if (curScale < 0.1){
      curScale = 0.1f; 
     }

     Bitmap resizedBitmap;    
     int newHeight = (int) (bmpHeight * curScale);
     int newWidth = (int) (bmpWidth * curScale);
     System.out.println("new width: "+newWidth+" new heigt: "+newHeight);
     resizedBitmap = Bitmap.createScaledBitmap(bitmap, newWidth, newHeight, false);
     System.out.println("resized bitmap: "+resizedBitmap);
     imageView.setImageBitmap(resizedBitmap); 
    }

Answer 1

我必须将相同的功能集成到我的应用程序中。

但正如我们所知，在Android中无法实现可缩放的ImageView。

我使用了以下库： https://github.com/sephiroth74/ImageViewZoom

试试这个。可能会帮助你... :)

捏合和缩放imageview

1 个答案: