@Override
 public boolean onTouch(View v, MotionEvent event)
 {
  mScaleGestureDetector.onTouchEvent(event);
 
  float x = 0, y = 0;
  // 拿到触摸点的个数
  final int pointerCount = event.getPointerCount();
  // 得到多个触摸点的x与y均值
  for (int i = 0; i < pointerCount; i++)
  {
   x += event.getX(i);
   y += event.getY(i);
  }
  x = x / pointerCount;
  y = y / pointerCount;
 
  /**
   * 每当触摸点发生变化时，重置mLasX , mLastY 
   */
  if (pointerCount != lastPointerCount)
  {
   isCanDrag = false;
   mLastX = x;
   mLastY = y;
  }
   
 
  lastPointerCount = pointerCount;
 
  switch (event.getAction())
  {
  case MotionEvent.ACTION_MOVE:
   Log.e(TAG, "ACTION_MOVE");
   float dx = x - mLastX;
   float dy = y - mLastY;
    
   if (!isCanDrag)
   {
    isCanDrag = isCanDrag(dx, dy);
   }
   if (isCanDrag)
   {
    RectF rectF = getMatrixRectF();
    if (getDrawable() != null)
    {
     isCheckLeftAndRight = isCheckTopAndBottom = true;
     // 如果宽度小于屏幕宽度，则禁止左右移动
     if (rectF.width() < getWidth())
     {
      dx = 0;
      isCheckLeftAndRight = false;
     }
     // 如果高度小雨屏幕高度，则禁止上下移动
     if (rectF.height() < getHeight())
     {
      dy = 0;
      isCheckTopAndBottom = false;
     }
     mScaleMatrix.postTranslate(dx, dy);
     checkMatrixBounds();
     setImageMatrix(mScaleMatrix);
    }
   }
   mLastX = x;
   mLastY = y;
   break;
 
  case MotionEvent.ACTION_UP:
  case MotionEvent.ACTION_CANCEL:
   Log.e(TAG, "ACTION_UP");
   lastPointerCount = 0;
   break;
  }
 
  return true;
 }

/**
  * 移动时，进行边界判断，主要判断宽或高大于屏幕的
  */
 private void checkMatrixBounds()
 {
  RectF rect = getMatrixRectF();
 
  float deltaX = 0, deltaY = 0;
  final float viewWidth = getWidth();
  final float viewHeight = getHeight();
  // 判断移动或缩放后，图片显示是否超出屏幕边界
  if (rect.top > 0 && isCheckTopAndBottom)
  {
   deltaY = -rect.top;
  }
  if (rect.bottom < viewHeight && isCheckTopAndBottom)
  {
   deltaY = viewHeight - rect.bottom;
  }
  if (rect.left > 0 && isCheckLeftAndRight)
  {
   deltaX = -rect.left;
  }
  if (rect.right < viewWidth && isCheckLeftAndRight)
  {
   deltaX = viewWidth - rect.right;
  }
  mScaleMatrix.postTranslate(deltaX, deltaY);
 }
 
 /**
  * 是否是推动行为
  * 
  * @param dx
  * @param dy
  * @return
  */
 private boolean isCanDrag(float dx, float dy)
 {
  return Math.sqrt((dx * dx) + (dy * dy)) >= mTouchSlop;
 }

public ZoomImageView(Context context, AttributeSet attrs)
 {
  super(context, attrs);
  mScaleGestureDetector = new ScaleGestureDetector(context, this);
  mGestureDetector = new GestureDetector(context,
    new SimpleOnGestureListener()
    {
     @Override
     public boolean onDoubleTap(MotionEvent e)
     {
      if (isAutoScale == true)
       return true;
 
      float x = e.getX();
      float y = e.getY();
      Log.e("DoubleTap", getScale() + " , " + initScale);
      if (getScale() < SCALE_MID)
      {
       ZoomImageView.this.postDelayed(
         new AutoScaleRunnable(SCALE_MID, x, y), 16);
       isAutoScale = true;
      } else if (getScale() >= SCALE_MID
        && getScale() < SCALE_MAX)
      {
       ZoomImageView.this.postDelayed(
         new AutoScaleRunnable(SCALE_MAX, x, y), 16);
       isAutoScale = true;
      } else
      {
       ZoomImageView.this.postDelayed(
         new AutoScaleRunnable(initScale, x, y), 16);
       isAutoScale = true;
      }
 
      return true;
     }
    });
  mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
  super.setScaleType(ScaleType.MATRIX);
  this.setOnTouchListener(this);
 }

/**
  * 自动缩放的任务
  * 
  * @author zhy
  * 
  */
 private class AutoScaleRunnable implements Runnable
 {
  static final float BIGGER = 1.07f;
  static final float SMALLER = 0.93f;
  private float mTargetScale;
  private float tmpScale;
 
  /**
   * 缩放的中心
   */
  private float x;
  private float y;
 
  /**
   * 传入目标缩放值，根据目标值与当前值，判断应该放大还是缩小
   * 
   * @param targetScale
   */
  public AutoScaleRunnable(float targetScale, float x, float y)
  {
   this.mTargetScale = targetScale;
   this.x = x;
   this.y = y;
   if (getScale() < mTargetScale)
   {
    tmpScale = BIGGER;
   } else
   {
    tmpScale = SMALLER;
   }
 
  }
 
  @Override
  public void run()
  {
   // 进行缩放
   mScaleMatrix.postScale(tmpScale, tmpScale, x, y);
   checkBorderAndCenterWhenScale();
   setImageMatrix(mScaleMatrix);
 
   final float currentScale = getScale();
   //如果值在合法范围内，继续缩放
   if (((tmpScale > 1f) && (currentScale < mTargetScale))
     || ((tmpScale < 1f) && (mTargetScale < currentScale)))
   {
    ZoomImageView.this.postDelayed(this, 16);
   } else//设置为目标的缩放比例
   {
    final float deltaScale = mTargetScale / currentScale;
    mScaleMatrix.postScale(deltaScale, deltaScale, x, y);
    checkBorderAndCenterWhenScale();
    setImageMatrix(mScaleMatrix);
    isAutoScale = false;
   }
 
  }
 }

@Override
 public boolean onTouch(View v, MotionEvent event)
 {
  if (mGestureDetector.onTouchEvent(event))
   return true;

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent">
 
  
 </android.support.v4.view.viewpager>
 
</relativelayout>

package com.zhy.zhy_scalegesturedetector02;
 
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
 
import com.zhy.view.ZoomImageView;
 
public class MainActivity extends Activity
{
 private ViewPager mViewPager;
 private int[] mImgs = new int[] { R.drawable.tbug, R.drawable.a,
   R.drawable.xx };
 private ImageView[] mImageViews = new ImageView[mImgs.length];
 
 @Override
 protected void onCreate(Bundle savedInstanceState)
 {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.vp);
   
  mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
  mViewPager.setAdapter(new PagerAdapter()
  {
 
   @Override
   public Object instantiateItem(ViewGroup container, int position)
   {
    ZoomImageView imageView = new ZoomImageView(
      getApplicationContext());
    imageView.setImageResource(mImgs[position]);
    container.addView(imageView);
    mImageViews[position] = imageView;
    return imageView;
   }
 
   @Override
   public void destroyItem(ViewGroup container, int position,
     Object object)
   {
    container.removeView(mImageViews[position]);
   }
 
   @Override
   public boolean isViewFromObject(View arg0, Object arg1)
   {
    return arg0 == arg1;
   }
 
   @Override
   public int getCount()
   {
    return mImgs.length;
   }
  });
 
 }
}

switch (event.getAction())
  {
  case MotionEvent.ACTION_DOWN:
   if (rectF.width() > getWidth() || rectF.height() > getHeight())
   {
    getParent().requestDisallowInterceptTouchEvent(true);
   }
   break;
  case MotionEvent.ACTION_MOVE:
   if (rectF.width() > getWidth() || rectF.height() > getHeight())
   {
    getParent().requestDisallowInterceptTouchEvent(true);
   }

if (isCanDrag)
   {
 
    if (getDrawable() != null)
    {
     if (getMatrixRectF().left == 0 && dx > 0)
     {
      getParent().requestDisallowInterceptTouchEvent(false);
     }
 
     if (getMatrixRectF().right == getWidth() && dx < 0)
     {
      getParent().requestDisallowInterceptTouchEvent(false);
     }

//      else if (getScale() >= SCALE_MID
//        && getScale() < SCALE_MAX)
//      {
//       ZoomImageView.this.postDelayed(
//         new AutoScaleRunnable(SCALE_MAX, x, y), 16);
//       isAutoScale = true;
//      }