在单个视图组中的两个视图上捏缩放 android

Question

我正在做一个项目，其中我需要单个布局中的两个带有缩放选项的图像视图。据我所知，android 允许通过一个视图轻松进行缩放。但我的问题不是这样的。我有两个图像视图一个接一个。我尝试在框架布局中做到这一点。但结果不太好。当超出布局范围时，图像会缩小，并且缩放不那么顺畅。我尝试使用已弃用的绝对布局来做到这一点，但它不起作用 欢迎所有建议。

我的代码在这里

  int x = (int)event.getRawX();
     int y = (int)event.getRawY();
         ImageView view = (ImageView) v;

         switch (event.getAction() & MotionEvent.ACTION_MASK) {
          case MotionEvent.ACTION_DOWN:
             savedMatrix.set(matrix);
             start.set(event.getX(), event.getY());

             mode = DRAG;
           hoffset = x - v.getLeft();
       voffset = y - v.getTop();
             break;
          case MotionEvent.ACTION_POINTER_DOWN:
             oldDist = spacing(event);
             Log.d(TAG, "oldDist=" + oldDist);
             if (oldDist > 10f) {
                savedMatrix.set(matrix);
                midPoint(mid, event);
                mode = ZOOM;
                Log.d(TAG, "mode=ZOOM");
             }
             break;
          case MotionEvent.ACTION_UP:
            // moveView(v, x - hoffset, y - voffset);
          case MotionEvent.ACTION_POINTER_UP:
             mode = NONE;

             Log.d(TAG, "mode=NONE");
             break;
          case MotionEvent.ACTION_MOVE:
             if (mode == DRAG) {
                 moveView(v, x - hoffset, y - voffset);
                hrecent = x;
                vrecent = y;
             }
             else if (mode == ZOOM) {


                newDist = spacing(event);
                if (newDist > 10f) {

                   matrix.set(savedMatrix);

                   float scale = newDist / oldDist;
         matrix.postScale(ScaleFactorForZoom, ScaleFactorForZoom, mid.x, mid.y);



               float delta =10.0f+ (newDist -oldDist)/oldDist;
           // view.setImageMatrix(matrix);    
                 float newHeight;
                 float newWidth;


        newHeight=(float) ((delta)+view.getHeight());
        newWidth=(float) ((delta)+view.getWidth());

                    oldDist = newDist; 



                 zoomView(view, newWidth, newHeight);

                }
             }
             break;
          }



          return true; 
    }

MoveView 功能是

     public void moveView(View v, int x, int y)
       {
         ViewGroup.LayoutParams params = v.getLayoutParams();
         if (params instanceof FrameLayout.LayoutParams)
         {
           FrameLayout.LayoutParams par = (FrameLayout.LayoutParams)params;
          View parent = (View)(v.getParent());
           x = Math.min(x, parent.getWidth());
           x = Math.max(x, 0);
           y = Math.min(y, parent.getHeight());
           y = Math.max(y, 0);


          par.leftMargin=x;
          par.topMargin=y;
           v.setLayoutParams(par);
       }
   }

Zoom 功能在这里

public void zoomView(View v, float width, float height)
   {
       ViewGroup.LayoutParams params = v.getLayoutParams();
       if (params instanceof FrameLayout.LayoutParams)
       {
           FrameLayout.LayoutParams par = (FrameLayout.LayoutParams)params;
           par.width = (int)width;
           par.height = (int)height;

           v.setLayoutParams(par);


       }
   }

Answer 1

我通过在框架布局上方放置两个图像视图并为框架布局编写触摸事件并放置两个按钮来选择要缩放的视图并为该图像设置矩阵来做到这一点

Answer 2

您不应该使用 par.width = (int) width 因为默认情况下小数部分总是被错误截断，
相反，使用 par.width = Math.round (Width) 并有时考虑一种恢复默认值的机制。