/**  * @author gongchaobin  *  *  自定义可伸缩的ImageView  */ public class ZoomImageView extends View{     /** 画笔类  **/     private Paint mPaint;     private Runnable mRefresh = null;     /** 缩放手势监听类  **/     private ScaleGestureDetector mScaleDetector;     /** 手势识别类  **/     private GestureDetector mGestureDetector;     /** 当前被渲染的Bitmap **/     private Bitmap mBitmap;     private int mThisWidth = -1, mThisHeight = -1;     private Runnable mOnLayoutRunnable = null;     private Matrix mBaseMatrix = new Matrix();     private Matrix mDisplayMatrix = new Matrix();     private Matrix mSuppMatrix = new Matrix();     private Matrix mMatrix = new Matrix();     /** 最大的拉伸比例   **/     private float mMaxZoom;     private float[] mMatrixValues = new float[9];     private Runnable mFling = null;     private double mLastDraw = 0;     static final int sPaintDelay = 250;     public ZoomImageView(Context context, AttributeSet attrs, int defStyle) {         super(context, attrs, defStyle);         // TODO Auto-generated constructor stub         init();     }     public ZoomImageView(Context context, AttributeSet attrs) {         super(context, attrs);         // TODO Auto-generated constructor stub         init();     }     public ZoomImageView(Context context) {         super(context);         // TODO Auto-generated constructor stub         init();     }     private void init() {         mPaint = new Paint();         // 图像抖动处理         mPaint.setDither(true);         // 过滤优化操作  加快显示         mPaint.setFilterBitmap(true);         // 去掉锯齿         mPaint.setAntiAlias(true);         /** 刷新线程  **/         mRefresh = new Runnable() {             @Override             public void run() {                 postInvalidate();             }         };         mScaleDetector = new ScaleGestureDetector(getContext(),new ScaleListener());         mGestureDetector = new GestureDetector(getContext(),new MyGestureListener());         // 判断是否是新的API  开启硬件加速         if(Build.VERSION.SDK_INT >=  Build.VERSION_CODES.HONEYCOMB) {             setLayerType(View.LAYER_TYPE_HARDWARE, null);         }     }     public Bitmap getImageBitmap() {         return mBitmap;     }     /** 回收Bitmap **/     public void clear() {         if(mBitmap != null && !mBitmap.isRecycled()) {             mBitmap.recycle();             mBitmap = null;         }     }     @Override     protected void onLayout(boolean changed, int left, int top, int right,             int bottom) {         // TODO Auto-generated method stub         super.onLayout(changed, left, top, right, bottom);         mThisWidth = right - left;         mThisHeight = bottom - top;         Runnable r = mOnLayoutRunnable;         if (r != null) {             mOnLayoutRunnable = null;             r.run();         }         if (mBitmap != null) {             setBaseMatrix(mBitmap, mBaseMatrix);             setImageMatrix(getImageViewMatrix());         }     }     private void setBaseMatrix(Bitmap bitmap, Matrix matrix) {         float viewWidth = getWidth();         float viewHeight = getHeight();         matrix.reset();         float widthScale = Math.min(viewWidth / (float)bitmap.getWidth(), 1.0f);         float heightScale = Math.min(viewHeight / (float)bitmap.getHeight(), 1.0f);         float scale;         if (widthScale > heightScale) {             scale = heightScale;         } else {             scale = widthScale;         }         /** 算取比例  进行平移   **/         matrix.setScale(scale, scale);         matrix.postTranslate(                 (viewWidth  - ((float)bitmap.getWidth()  * scale))/2F,                 (viewHeight - ((float)bitmap.getHeight() * scale))/2F);     }     protected Matrix getImageViewMatrix() {         mDisplayMatrix.set(mBaseMatrix);         mDisplayMatrix.postConcat(mSuppMatrix);         return mDisplayMatrix;     }     public void setImageMatrix(Matrix m){         /** Matrix是否为空并是否定义   **/         if (m != null && m.isIdentity()) {             m = null;         }         if (m == null && !this.mMatrix.isIdentity() || m != null && !this.mMatrix.equals(m)) {             this.mMatrix.set(m);             invalidate();         }     }     static private void translatePoint(Matrix matrix, float [] xy) {         matrix.mapPoints(xy);     }     /**      * 设置Bitmap      *      * @param bitmap      */     public void setImageBitmap(final Bitmap bitmap) {         final int viewWidth = getWidth();         // 开启硬件加速         if( Build.VERSION.SDK_INT >=  Build.VERSION_CODES.HONEYCOMB && bitmap!=null && bitmap.getHeight()>1800 )             setLayerType(View.LAYER_TYPE_SOFTWARE, null);         if (viewWidth <= 0)  {             mOnLayoutRunnable = new Runnable() {                 public void run() {                     setImageBitmap(bitmap);                 }             };             return;         }         if (bitmap != null) {             setBaseMatrix(bitmap, mBaseMatrix);             this.mBitmap = bitmap;         } else {             mBaseMatrix.reset();             this.mBitmap = bitmap;         }         mSuppMatrix.reset();         setImageMatrix(getImageViewMatrix());         mMaxZoom = maxZoom();         zoomTo(zoomDefault());     }     public void zoomTo(float scale) {         float width = getWidth();         float height = getHeight();         zoomTo(scale, width/2F, height/2F);     }     protected void zoomTo(float scale, float centerX, float centerY) {         if (scale > mMaxZoom) {             scale = mMaxZoom;         }         float oldScale = getScale();         float deltaScale = scale / oldScale;         /** 根据某个中心点按照比例缩放  **/         mSuppMatrix.postScale(deltaScale, deltaScale, centerX, centerY);         setImageMatrix(getImageViewMatrix());         center(true, true, false);     }     /**      * 计算中心位置      *      * @param vertical      * @param horizontal      * @param animate      */     protected void center(boolean vertical, boolean horizontal, boolean animate) {         if (mBitmap == null)             return;         Matrix m = getImageViewMatrix();         float [] topLeft  = new float[] { 0, 0 };         float [] botRight = new float[] { mBitmap.getWidth(), mBitmap.getHeight() };         translatePoint(m, topLeft);         translatePoint(m, botRight);         float height = botRight[1] - topLeft[1];         float width  = botRight[0] - topLeft[0];         float deltaX = 0, deltaY = 0;         if (vertical) {             int viewHeight = getHeight();             if (height < viewHeight) {                 deltaY = (viewHeight - height)/2 - topLeft[1];             } else if (topLeft[1] > 0) {                 deltaY = -topLeft[1];             } else if (botRight[1] < viewHeight) {                 deltaY = getHeight() - botRight[1];             }         }         if (horizontal) {             int viewWidth = getWidth();             if (width < viewWidth) {                 deltaX = (viewWidth - width)/2 - topLeft[0];             } else if (topLeft[0] > 0) {                 deltaX = -topLeft[0];             } else if (botRight[0] < viewWidth) {                 deltaX = viewWidth - botRight[0];             }         }         postTranslate(deltaX, deltaY);         if (animate) {             Animation a = new TranslateAnimation(-deltaX, 0, -deltaY, 0);             a.setStartTime(SystemClock.elapsedRealtime());             a.setDuration(250);             setAnimation(a);         }         setImageMatrix(getImageViewMatrix());     }     protected void postTranslate(float dx, float dy) {         mSuppMatrix.postTranslate(dx, dy);     }     public float getScale() {         return getScale(mSuppMatrix);     }     protected float getScale(Matrix matrix) {         if(mBitmap!=null)             return getValue(matrix, Matrix.MSCALE_X);         else             return 1f;     }     protected float getValue(Matrix matrix, int whichValue) {         matrix.getValues(mMatrixValues);         return mMatrixValues[whichValue];     }     /**      * 计算最大的拉伸比例      *      * @return      */     protected float maxZoom() {         if (mBitmap == null)             return 1F;         float fw = (float) mBitmap.getWidth()  / (float)mThisWidth;         float fh = (float) mBitmap.getHeight() / (float)mThisHeight;         float max = Math.max(fw, fh) * 16;         return max;     }     /**      * 原始显示比例      *      * @return      */     public float zoomDefault() {         if (mBitmap == null)             return 1F;         float fw = (float)mThisWidth/(float)mBitmap.getWidth();         float fh = (float)mThisHeight/(float)mBitmap.getHeight();         return Math.max(Math.min(fw, fh),1);     }     protected void zoomTo(final float scale, final float centerX, final float centerY, final float durationMs) {         final float incrementPerMs = (scale - getScale()) / durationMs;         final float oldScale = getScale();         final long startTime = System.currentTimeMillis();         post(new Runnable() {             public void run() {                 long now = System.currentTimeMillis();                 float currentMs = Math.min(durationMs, (float)(now - startTime));                 float target = oldScale + (incrementPerMs * currentMs);                 zoomTo(target, centerX, centerY);                 if (currentMs < durationMs) {                     post(this);                 }             }         });     }     protected void scrollBy( float distanceX, float distanceY, final float durationMs ){         final float dx = distanceX;         final float dy = distanceY;         final long startTime = System.currentTimeMillis();         mFling = new Runnable() {             float old_x    = 0;             float old_y    = 0;             public void run()             {                 long now = System.currentTimeMillis();                 float currentMs = Math.min( durationMs, now - startTime );                 float x = easeOut( currentMs, 0, dx, durationMs );                 float y = easeOut( currentMs, 0, dy, durationMs );                 postTranslate( ( x - old_x ), ( y - old_y ) );                 center(true, true, false);                 old_x = x;                 old_y = y;                 if ( currentMs < durationMs ) {                     post( this );                 }             }         };         post( mFling );     }     private float easeOut( float time, float start, float end, float duration){         return end * ( ( time = time / duration - 1 ) * time * time + 1 ) + start;     }     @Override     protected void onDraw(Canvas canvas) {         // TODO Auto-generated method stub         if(mBitmap!=null && !mBitmap.isRecycled() ){             if( Build.VERSION.SDK_INT >=  Build.VERSION_CODES.HONEYCOMB && getLayerType() == View.LAYER_TYPE_HARDWARE ){                 canvas.drawBitmap(mBitmap, mMatrix, null);             }else{                 if( (System.currentTimeMillis()-mLastDraw) > sPaintDelay ){                     canvas.drawBitmap(mBitmap, mMatrix, mPaint);                     mLastDraw = System.currentTimeMillis();                 }                 else{                     canvas.drawBitmap(mBitmap, mMatrix, null);                     removeCallbacks(mRefresh);                     postDelayed(mRefresh, sPaintDelay);                 }             }         }     }     /**      * @author Administrator      *      * 手势缩放监听      */     class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {         @Override         public boolean onScale(ScaleGestureDetector detector) {             // TODO Auto-generated method stub             Log.i("ZoomImageView", "onScale");             if(detector!=null && detector.isInProgress()){                 try{                     float targetScale = getScale() * detector.getScaleFactor();                     targetScale = Math.min(maxZoom(), Math.max(targetScale, 1.0f) );                     zoomTo(targetScale, detector.getFocusX(), detector.getFocusY() );                     invalidate();                     return true;                 }catch(IllegalArgumentException e){                     e.printStackTrace();                 }             }             return false;         }     };     /**      * @author Administrator      *      * 手势识别监听      */     class MyGestureListener extends GestureDetector.SimpleOnGestureListener {         @Override         public boolean onScroll(MotionEvent e1, MotionEvent e2,                 float distanceX, float distanceY) {             // TODO Auto-generated method stub             Log.i("ZoomImageView", "onScroll");             if((e1 != null && e1.getPointerCount() > 1) || (e2 != null && e2.getPointerCount() > 1)                     || (mScaleDetector != null && mScaleDetector.isInProgress())){                 return false;             }             if(getScale() > zoomDefault() ) {                 removeCallbacks(mFling);                 postTranslate(-distanceX, -distanceY);                 center(true, true, false);             }             return true;         }         @Override         public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,                 float velocityY) {             Log.i("ZoomImageView", "onFling");             // TODO Auto-generated method stub             if ((e1!=null && e1.getPointerCount() > 1) || ( e2!=null && e2.getPointerCount() > 1))                 return false;             if (mScaleDetector.isInProgress())                 return false;             try{                 float diffX = e2.getX() - e1.getX();                 float diffY = e2.getY() - e1.getY();                 if ( Math.abs( velocityX ) > 800 || Math.abs( velocityY ) > 800 ) {                     scrollBy( diffX / 2, diffY / 2, 300 );                     invalidate();                 }             }catch(NullPointerException  e){                 e.printStackTrace();             }             return super.onFling( e1, e2, velocityX, velocityY );         }         @Override         public boolean onDoubleTap(MotionEvent e) {             // TODO Auto-generated method stub             Log.i("ZoomImageView", "onDoubleTap");             if ( getScale() > zoomDefault() ){                 zoomTo(zoomDefault());             }             else                 zoomTo(zoomDefault()*3, e.getX(), e.getY(),200);             return true;         }         @Override         public boolean onSingleTapConfirmed(MotionEvent e) {             // TODO Auto-generated method stub             Log.i("ZoomImageView", "onSingleTapConfirmed");             // 设置点击事件             if(mImageTouchedListener != null) {                 mImageTouchedListener.onImageTouched();                 return false;             }             return super.onSingleTapConfirmed(e);         }     }     @Override     public boolean onTouchEvent(MotionEvent event) {         // TODO Auto-generated method stub         if(mBitmap != null) {             mScaleDetector.onTouchEvent(event);             if(!mScaleDetector.isInProgress()) {                 mGestureDetector.onTouchEvent(event);             }         }         return true;     };     /**      *      * @author Administrator      *      * 点击接口      */     private onImageTouchedListener mImageTouchedListener;     public interface onImageTouchedListener {         void onImageTouched();     }     public void setOnImageTouchedListener(onImageTouchedListener listener ){         this.mImageTouchedListener = listener;     }

<com.example.pay.ZoomImageView         android:scaleType="matrix"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         android:id="@+id/zommImageView"         />

mZoomImageView = (ZoomImageView) findViewById(R.id.zommImageView);         mZoomImageView.setImageBitmap(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));         mZoomImageView.setOnImageTouchedListener(new onImageTouchedListener() {             @Override             public void onImageTouched() {                 // TODO Auto-generated method stub                 Toast.makeText(MainActivity.this, "11111", Toast.LENGTH_LONG).show();             }         });