/*** 
   * 设置显示图片 
   */ 
  @Override 
  public void setImageBitmap(Bitmap bm) { 
    super.setImageBitmap(bm); 
    /** 获取图片宽高 **/ 
    bitmap_W = bm.getWidth(); 
    bitmap_H = bm.getHeight(); 
 
    MAX_W = bitmap_W * 3; 
    MAX_H = bitmap_H * 3; 
 
    MIN_W = bitmap_W / 2; 
    MIN_H = bitmap_H / 2; 
 
  }

@Override 
  protected void onLayout(boolean changed, int left, int top, int right, 
      int bottom) { 
    super.onLayout(changed, left, top, right, bottom); 
    if (start_Top == -1) { 
      start_Top = top; 
      start_Left = left; 
      start_Bottom = bottom; 
      start_Right = right; 
    } 
 
  } 

/*** 
   * touch 事件 
   */ 
  @Override 
  public boolean onTouchEvent(MotionEvent event) { 
    /** 处理单点、多点触摸 **/ 
    switch (event.getAction() & MotionEvent.ACTION_MASK) { 
    case MotionEvent.ACTION_DOWN: 
      onTouchDown(event); 
      break; 
    // 多点触摸 
    case MotionEvent.ACTION_POINTER_DOWN: 
      onPointerDown(event); 
      break; 
 
    case MotionEvent.ACTION_MOVE: 
      onTouchMove(event); 
      break; 
    case MotionEvent.ACTION_UP: 
      mode = MODE.NONE; 
      break; 
 
    // 多点松开 
    case MotionEvent.ACTION_POINTER_UP: 
      mode = MODE.NONE; 
      /** 执行缩放还原 **/ 
      if (isScaleAnim) { 
        doScaleAnim(); 
      } 
      break; 
    } 
 
    return true; 
  } 

/** 按下 **/ 
  void onTouchDown(MotionEvent event) { 
    mode = MODE.DRAG; 
 
    current_x = (int) event.getRawX(); 
    current_y = (int) event.getRawY(); 
 
    start_x = (int) event.getX(); 
    start_y = current_y - this.getTop(); 
 
  } 

/** 两个手指 只能放大缩小 **/ 
  void onPointerDown(MotionEvent event) { 
    if (event.getPointerCount() == 2) { 
      mode = MODE.ZOOM; 
      beforeLenght = getDistance(event);// 获取两点的距离 
    } 
  } 

/** 移动的处理 **/ 
void onTouchMove(MotionEvent event) { 
  int left = 0, top = 0, right = 0, bottom = 0; 
  /** 处理拖动 **/ 
  if (mode == MODE.DRAG) { 
 
    /** 在这里要进行判断处理，防止在drag时候越界 **/ 
 
    /** 获取相应的l，t,r ,b **/ 
    left = current_x - start_x; 
    right = current_x + this.getWidth() - start_x; 
    top = current_y - start_y; 
    bottom = current_y - start_y + this.getHeight(); 
 
    /** 水平进行判断 **/ 
    if (isControl_H) { 
      if (left >= 0) { 
        left = 0; 
        right = this.getWidth(); 
      } 
      if (right <= screen_W) { 
        left = screen_W - this.getWidth(); 
        right = screen_W; 
      } 
    } else { 
      left = this.getLeft(); 
      right = this.getRight(); 
    } 
    /** 垂直判断 **/ 
    if (isControl_V) { 
      if (top >= 0) { 
        top = 0; 
        bottom = this.getHeight(); 
      } 
 
      if (bottom <= screen_H) { 
        top = screen_H - this.getHeight(); 
        bottom = screen_H; 
      } 
    } else { 
      top = this.getTop(); 
      bottom = this.getBottom(); 
    } 
    if (isControl_H || isControl_V) 
      this.setPosition(left, top, right, bottom); 
 
    current_x = (int) event.getRawX(); 
    current_y = (int) event.getRawY(); 
 
  } 
  /** 处理缩放 **/ 
  else if (mode == MODE.ZOOM) { 
 
    afterLenght = getDistance(event);// 获取两点的距离 
 
    float gapLenght = afterLenght - beforeLenght;// 变化的长度 
 
    if (Math.abs(gapLenght) > 5f) { 
      scale_temp = afterLenght / beforeLenght;// 求的缩放的比例 
 
      this.setScale(scale_temp); 
 
      beforeLenght = afterLenght; 
    } 
  } 
 
} 

/** 处理缩放 **/ 
  void setScale(float scale) { 
    int disX = (int) (this.getWidth() * Math.abs(1 - scale)) / 4;// 获取缩放水平距离 
    int disY = (int) (this.getHeight() * Math.abs(1 - scale)) / 4;// 获取缩放垂直距离 
 
    // 放大 
    if (scale > 1 && this.getWidth() <= MAX_W) { 
      current_Left = this.getLeft() - disX; 
      current_Top = this.getTop() - disY; 
      current_Right = this.getRight() + disX; 
      current_Bottom = this.getBottom() + disY; 
 
      this.setFrame(current_Left, current_Top, current_Right, 
          current_Bottom); 
      /*** 
       * 此时因为考虑到对称，所以只做一遍判断就可以了。 
       */ 
      if (current_Top <= 0 && current_Bottom >= screen_H) { 
        Log.e("jj", "屏幕高度=" + this.getHeight()); 
        isControl_V = true;// 开启垂直监控 
      } else { 
        isControl_V = false; 
      } 
      if (current_Left <= 0 && current_Right >= screen_W) { 
        isControl_H = true;// 开启水平监控 
      } else { 
        isControl_H = false; 
      } 
 
    } 
    // 缩小 
    else if (scale < 1 && this.getWidth() >= MIN_W) { 
      current_Left = this.getLeft() + disX; 
      current_Top = this.getTop() + disY; 
      current_Right = this.getRight() - disX; 
      current_Bottom = this.getBottom() - disY; 
      /*** 
       * 在这里要进行缩放处理 
       */ 
      // 上边越界 
      if (isControl_V && current_Top > 0) { 
        current_Top = 0; 
        current_Bottom = this.getBottom() - 2 * disY; 
        if (current_Bottom < screen_H) { 
          current_Bottom = screen_H; 
          isControl_V = false;// 关闭垂直监听 
        } 
      } 
      // 下边越界 
      if (isControl_V && current_Bottom < screen_H) { 
        current_Bottom = screen_H; 
        current_Top = this.getTop() + 2 * disY; 
        if (current_Top > 0) { 
          current_Top = 0; 
          isControl_V = false;// 关闭垂直监听 
        } 
      } 
 
      // 左边越界 
      if (isControl_H && current_Left >= 0) { 
        current_Left = 0; 
        current_Right = this.getRight() - 2 * disX; 
        if (current_Right <= screen_W) { 
          current_Right = screen_W; 
          isControl_H = false;// 关闭 
        } 
      } 
      // 右边越界 
      if (isControl_H && current_Right <= screen_W) { 
        current_Right = screen_W; 
        current_Left = this.getLeft() + 2 * disX; 
        if (current_Left >= 0) { 
          current_Left = 0; 
          isControl_H = false;// 关闭 
        } 
      } 
 
      if (isControl_H || isControl_V) { 
        this.setFrame(current_Left, current_Top, current_Right, 
            current_Bottom); 
      } else { 
        this.setFrame(current_Left, current_Top, current_Right, 
            current_Bottom); 
        isScaleAnim = true;// 开启缩放动画 
      } 
 
    } 
 
  } 

/*** 
   * 回缩动画執行 
   */ 
  class MyAsyncTask extends AsyncTask<Void, Integer, Void> { 
    private int screen_W, current_Width, current_Height; 
 
    private int left, top, right, bottom; 
 
    private float scale_WH;// 宽高的比例 
 
    /** 当前的位置属性 **/ 
    public void setLTRB(int left, int top, int right, int bottom) { 
      this.left = left; 
      this.top = top; 
      this.right = right; 
      this.bottom = bottom; 
    } 
 
    private float STEP = 5f;// 步伐 
 
    private float step_H, step_V;// 水平步伐，垂直步伐 
 
    public MyAsyncTask(int screen_W, int current_Width, int current_Height) { 
      super(); 
      this.screen_W = screen_W; 
      this.current_Width = current_Width; 
      this.current_Height = current_Height; 
      scale_WH = (float) current_Height / current_Width; 
      step_H = STEP; 
      step_V = scale_WH * STEP; 
    } 
 
    @Override 
    protected Void doInBackground(Void... params) { 
 
      while (current_Width <= screen_W) { 
 
        left -= step_H; 
        top -= step_V; 
        right += step_H; 
        bottom += step_V; 
 
        current_Width += 2 * step_H; 
 
        left = Math.max(left, start_Left); 
        top = Math.max(top, start_Top); 
        right = Math.min(right, start_Right); 
        bottom = Math.min(bottom, start_Bottom); 
 
        onProgressUpdate(new Integer[] { left, top, right, bottom }); 
        try { 
          Thread.sleep(10); 
        } catch (InterruptedException e) { 
          e.printStackTrace(); 
        } 
      } 
 
      return null; 
    } 
 
    @Override 
    protected void onProgressUpdate(final Integer... values) { 
      super.onProgressUpdate(values); 
      mActivity.runOnUiThread(new Runnable() { 
        @Override 
        public void run() { 
          setFrame(values[0], values[1], values[2], values[3]); 
        } 
      }); 
 
    } 
 
  } 

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent" 
  android:gravity="center" > 
 
  <com.jj.drag.DragImageView 
    android:id="@+id/div_main" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"  
    android:scaleType="fitXY" 
    /> 
 
</LinearLayout> 

/** 测量状态栏高度 **/ 
    viewTreeObserver = dragImageView.getViewTreeObserver(); 
    viewTreeObserver 
        .addOnGlobalLayoutListener(new OnGlobalLayoutListener() { 
 
          @Override 
          public void onGlobalLayout() { 
            if (state_height == 0) { 
              // 获取状况栏高度 
              Rect frame = new Rect(); 
              getWindow().getDecorView() 
                  .getWindowVisibleDisplayFrame(frame); 
              state_height = frame.top; 
              dragImageView.setScreen_H(window_height-state_height); 
              dragImageView.setScreen_W(window_width); 
            } 
 
          } 
        });