gallery相册，拖动放大缩小

package com.cn.gallery;import java.util.ArrayList;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.DialogInterface;import android.content.Intent;import android.os.Bundle;import android.util.FloatMath;import android.view.KeyEvent;import android.view.MotionEvent;import android.view.View;import android.view.Window;import android.view.WindowManager;import android.view.View.OnTouchListener;import android.view.animation.Animation;import android.view.animation.ScaleAnimation;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.FrameLayout;import android.widget.Gallery;import android.widget.Toast;import android.widget.AdapterView.OnItemClickListener;import android.widget.AdapterView.OnItemSelectedListener;import com.cn.activity.R;import com.cn.tools.MyActivity;public class ActivityImageBrowse extends MyActivity implements OnTouchListener {// 屏幕宽度/*public static int screenWidth;// 屏幕高度public static int screenHeight;*/private MyGallery gallery;float beforeLenght = 0.0f; // 两触点距离float afterLenght = 0.0f; // 两触点距离boolean isScale = false;float currentScale = 1.0f;// 当前图片的缩放比率ArrayList<String> photos;GalleryAdapter  galleryAdapter;private String code;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.picturebrowse);//获取意图传过来的参数Intent intent = this.getIntent();//激活意图try {photos = intent.getExtras().getStringArrayList("photos");code = intent.getExtras().getString("code");/*String images[] = new String[photos.size()];for(int i=0;i<photos.size();i++){images[i] = photos.get(i);}*/gallery = (MyGallery) findViewById(R.id.gallery);gallery.setVerticalFadingEdgeEnabled(false);// 取消竖直渐变边框gallery.setHorizontalFadingEdgeEnabled(false);// 取消水平渐变边框galleryAdapter =  new GalleryAdapter(this,photos);gallery.setAdapter(galleryAdapter);gallery.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1,int position, long arg3) {// TODO Auto-generated method stubfinal int index = position;AlertDialog.Builder alert = new AlertDialog.Builder(ActivityImageBrowse.this);alert.setTitle("删除图片");alert.setMessage("是否要删除该图片？");alert.setPositiveButton("确定",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubphotos.remove(index);galleryAdapter.setPhotos(photos);galleryAdapter.notifyDataSetChanged();//刷新if(photos.size()<1){finishImageBrowseActivity();//关闭Activity}}});alert.setNegativeButton("取消", null);alert.show();}});} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}/* gallery.setOnTouchListener(this); gallery.setOnItemSelectedListener(new GalleryChangeListener()); FrameLayout.LayoutParams params=(FrameLayout.LayoutParams) gallery.getLayoutParams(); params.height=400; params.width=300;*//*screenWidth = getWindow().getWindowManager().getDefaultDisplay().getWidth();screenHeight = getWindow().getWindowManager().getDefaultDisplay().getHeight();*/}/*private class GalleryChangeListener implements OnItemSelectedListener {@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {currentScale = 1.0f;isScale = false;beforeLenght = 0.0f;afterLenght = 0.0f;}@Overridepublic void onNothingSelected(AdapterView<?> arg0) {// TODO Auto-generated method stub}}*/@Overridepublic boolean onTouch(View v, MotionEvent event) {// Log.i("","touched---------------");switch (event.getAction() & MotionEvent.ACTION_MASK) {case MotionEvent.ACTION_POINTER_DOWN:// 多点缩放beforeLenght = spacing(event);if (beforeLenght > 5f) {isScale = true;}break;case MotionEvent.ACTION_MOVE:if (isScale) {afterLenght = spacing(event);if (afterLenght < 5f)break;float gapLenght = afterLenght - beforeLenght;if (gapLenght == 0) {break;} else if (Math.abs(gapLenght) > 5f) {// FrameLayout.LayoutParams params =// (FrameLayout.LayoutParams) gallery.getLayoutParams();float scaleRate = gapLenght / 854;// 缩放比例// Log.i("",// "scaleRate："+scaleRate+" currentScale:"+currentScale);// Log.i("", "缩放比例：" +// scaleRate+" 当前图片的缩放比例："+currentScale);// params.height=(int)(800*(scaleRate+1));// params.width=(int)(480*(scaleRate+1));// params.height = 400;// params.width = 300;// gallery.getChildAt(0).setLayoutParams(new// Gallery.LayoutParams(300, 300));Animation myAnimation_Scale = new ScaleAnimation(currentScale, currentScale + scaleRate, currentScale, currentScale + scaleRate, Animation.RELATIVE_TO_SELF, 0.5f,Animation.RELATIVE_TO_SELF, 0.5f);// Animation myAnimation_Scale = new// ScaleAnimation(currentScale, 1+scaleRate, currentScale,// 1+scaleRate);myAnimation_Scale.setDuration(100);myAnimation_Scale.setFillAfter(true);myAnimation_Scale.setFillEnabled(true);// gallery.getChildAt(0).startAnimation(myAnimation_Scale);// gallery.startAnimation(myAnimation_Scale);currentScale = currentScale + scaleRate;// gallery.getSelectedView().setLayoutParams(new// Gallery.LayoutParams((int)(480), (int)(800)));// Log.i("",// "===========:::"+gallery.getSelectedView().getLayoutParams().height);// gallery.getSelectedView().getLayoutParams().height=(int)(800*(currentScale));// gallery.getSelectedView().getLayoutParams().width=(int)(480*(currentScale));gallery.getSelectedView().setLayoutParams(new Gallery.LayoutParams((int) (480 * (currentScale)), (int) (854 * (currentScale))));// gallery.getSelectedView().setLayoutParams(new// Gallery.LayoutParams((int)(320*(scaleRate+1)),// (int)(480*(scaleRate+1))));// gallery.getSelectedView().startAnimation(myAnimation_Scale);// isScale = false;beforeLenght = afterLenght;}return true;}break;case MotionEvent.ACTION_POINTER_UP:isScale = false;break;}return false;}/** * 就算两点间的距离 */private float spacing(MotionEvent event) {float x = event.getX(0) - event.getX(1);float y = event.getY(0) - event.getY(1);return FloatMath.sqrt(x * x + y * y);}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {// TODO Auto-generated method stubif(keyCode == KeyEvent.KEYCODE_BACK){finishImageBrowseActivity();return true;}return super.onKeyDown(keyCode, event);}public void finishImageBrowseActivity(){Intent intent = new Intent();//数据使用Intent返回Bundle bundler = new Bundle();bundler.putString("code", code);bundler.putStringArrayList("result", photos);intent.putExtras(bundler);this.setResult(4,intent);this.finish();//关闭Activity}}

/**   * GalleryAdapter.java * @version 1.0 * @author Haven * @createTime 2011-12-9 下午05:04:34 */package com.cn.gallery;import java.util.ArrayList;import com.cn.tools.FileManager;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.view.View;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.widget.BaseAdapter;import android.widget.Gallery;public class GalleryAdapter extends BaseAdapter {private Context context;ArrayList<String> photos;public void setPhotos(ArrayList<String> photos) {this.photos = photos;}public GalleryAdapter(Context context,ArrayList<String> photos) {this.context = context;this.photos = photos;}@Overridepublic int getCount() {return photos.size();}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {//Bitmap bmp = BitmapFactory.decodeResource(context.getResources(), images[position]);MyImageView view = null;Bitmap bmp=null;try {String imagePath = FileManager.getApplicaionPath() + photos.get(position);bmp = BitmapFactory.decodeFile(imagePath);view = new MyImageView(context, bmp.getWidth(), bmp.getHeight());view.setLayoutParams(new Gallery.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));view.setImageBitmap(bmp);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}finally{if(bmp != null && !bmp.isRecycled()){bmp = null;//回收图片所占的内存 }}return view;}}

 

 

/**   * MyGallery.java * @version 1.0 * @author Haven * @createTime 2011-12-9 下午03:42:53 * android.widget.Gallery的子函数。此类很重要。建议仔细看 */package com.cn.gallery;import android.app.Activity;import android.content.Context;import android.graphics.Matrix;import android.graphics.Rect;import android.util.AttributeSet;import android.util.Log;import android.view.GestureDetector;import android.view.MotionEvent;import android.view.View;import android.view.GestureDetector.SimpleOnGestureListener;import android.widget.Gallery;public class MyGallery extends Gallery {private GestureDetector gestureScanner;private MyImageView imageView;public int screenWidth;public int screenHeight;public MyGallery(Context context) {super(context);screenWidth = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getWidth();screenHeight = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getHeight();}public MyGallery(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);screenWidth = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getWidth();screenHeight = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getHeight();}public MyGallery(Context context, AttributeSet attrs) {super(context, attrs);screenWidth = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getWidth();screenHeight = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getHeight();gestureScanner = new GestureDetector(new MySimpleGesture());this.setOnTouchListener(new OnTouchListener() {float baseValue;float originalScale;@Overridepublic boolean onTouch(View v, MotionEvent event) {View view = MyGallery.this.getSelectedView();if (view instanceof MyImageView) {imageView = (MyImageView) view;if (event.getAction() == MotionEvent.ACTION_DOWN) {baseValue = 0;originalScale = imageView.getScale();}if (event.getAction() == MotionEvent.ACTION_MOVE) {if (event.getPointerCount() == 2) {float x = event.getX(0) - event.getX(1);float y = event.getY(0) - event.getY(1);float value = (float) Math.sqrt(x * x + y * y);// 计算两点的距离// System.out.println("value:" + value);if (baseValue == 0) {baseValue = value;} else {float scale = value / baseValue;// 当前两点间的距离除以手指落下时两点间的距离就是需要缩放的比例。// scale the imageimageView.zoomTo(originalScale * scale, x + event.getX(1), y + event.getY(1));}}}}return false;}});}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {View view = MyGallery.this.getSelectedView();if (view instanceof MyImageView) {imageView = (MyImageView) view;float v[] = new float[9];Matrix m = imageView.getImageMatrix();m.getValues(v);// 图片实时的上下左右坐标float left, right;// 图片的实时宽，高float width, height;width = imageView.getScale() * imageView.getImageWidth();height = imageView.getScale() * imageView.getImageHeight();// 一下逻辑为移动图片和滑动gallery换屏的逻辑。如果没对整个框架了解的非常清晰，改动以下的代码前请三思！！！！！！if ((int) width <= screenWidth && (int) height <= screenHeight)// 如果图片当前大小<屏幕大小，直接处理滑屏事件{super.onScroll(e1, e2, distanceX, distanceY);} else {left = v[Matrix.MTRANS_X];right = left + width;Rect r = new Rect();imageView.getGlobalVisibleRect(r);if (distanceX > 0)// 向左滑动{if (r.left > 0) {// 判断当前ImageView是否显示完全super.onScroll(e1, e2, distanceX, distanceY);} else if (right < screenWidth) {super.onScroll(e1, e2, distanceX, distanceY);} else {imageView.postTranslate(-distanceX, -distanceY);}} else if (distanceX < 0)// 向右滑动{if (r.right < screenWidth) {super.onScroll(e1, e2, distanceX, distanceY);} else if (left > 0) {super.onScroll(e1, e2, distanceX, distanceY);} else {imageView.postTranslate(-distanceX, -distanceY);}}}} else {super.onScroll(e1, e2, distanceX, distanceY);}return false;}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {return false;}@Overridepublic boolean onTouchEvent(MotionEvent event) {gestureScanner.onTouchEvent(event);switch (event.getAction()) {case MotionEvent.ACTION_UP:// 判断上下边界是否越界View view = MyGallery.this.getSelectedView();if (view instanceof MyImageView) {imageView = (MyImageView) view;float width = imageView.getScale() * imageView.getImageWidth();float height = imageView.getScale() * imageView.getImageHeight();if ((int) width <= screenWidth && (int) height <= screenHeight)// 如果图片当前大小<屏幕大小，判断边界{break;}float v[] = new float[9];Matrix m = imageView.getImageMatrix();m.getValues(v);float top = v[Matrix.MTRANS_Y];float bottom = top + height;if (top > 0) {imageView.postTranslateDur(-top, 200f);}Log.i("manga", "bottom:" + bottom);if (bottom < screenHeight) {imageView.postTranslateDur(screenHeight - bottom, 200f);}}break;}return super.onTouchEvent(event);}private class MySimpleGesture extends SimpleOnGestureListener {// 按两下的第二下Touch down时触发public boolean onDoubleTap(MotionEvent e) {View view = MyGallery.this.getSelectedView();if (view instanceof MyImageView) {imageView = (MyImageView) view;if (imageView.getScale() > imageView.getScaleRate()) {imageView.zoomTo(imageView.getScaleRate(), screenWidth / 2, screenHeight / 2, 200f);// imageView.layoutToCenter();} else {imageView.zoomTo(1.0f, screenWidth / 2, screenHeight / 2, 200f);}} else {}// return super.onDoubleTap(e);return true;}}}

 

 

 

/**   * MyImageView.java * @version 1.0 * @author Haven * @createTime 2011-12-9 下午03:12:30 * 此类代码是根据android系统自带的ImageViewTouchBase代码修改 */package com.cn.gallery;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Matrix;import android.graphics.RectF;import android.os.Handler;import android.util.AttributeSet;import android.view.KeyEvent;import android.widget.ImageView;public class MyImageView extends ImageView {@SuppressWarnings("unused")private static final String TAG = "ImageViewTouchBase";public int screenWidth ;public int screenHeight ;// This is the base transformation which is used to show the image// initially. The current computation for this shows the image in// it's entirety, letterboxing as needed. One could choose to// show the image as cropped instead.//// This matrix is recomputed when we go from the thumbnail image to// the full size image.protected Matrix mBaseMatrix = new Matrix();// This is the supplementary transformation which reflects what// the user has done in terms of zooming and panning.//// This matrix remains the same when we go from the thumbnail image// to the full size image.protected Matrix mSuppMatrix = new Matrix();// This is the final matrix which is computed as the concatentation// of the base matrix and the supplementary matrix.private final Matrix mDisplayMatrix = new Matrix();// Temporary buffer used for getting the values out of a matrix.private final float[] mMatrixValues = new float[9];// The current bitmap being displayed.// protected final RotateBitmap mBitmapDisplayed = new RotateBitmap(null);protected Bitmap image = null;int mThisWidth = -1, mThisHeight = -1;float mMaxZoom = 2.0f;// 最大缩放比例float mMinZoom ;// 最小缩放比例private int imageWidth;// 图片的原始宽度private int imageHeight;// 图片的原始高度private float scaleRate;// 图片适应屏幕的缩放比例public MyImageView(Context context, int imageWidth, int imageHeight) {super(context);this.imageHeight = imageHeight;this.imageWidth = imageWidth;init();screenWidth = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getWidth();screenHeight = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getHeight();}public MyImageView(Context context, AttributeSet attrs, int imageWidth, int imageHeight) {super(context, attrs);this.imageHeight = imageHeight;this.imageWidth = imageWidth;init();screenWidth = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getWidth();screenHeight = ((Activity) context).getWindow().getWindowManager().getDefaultDisplay().getHeight();}/** * 计算图片要适应屏幕需要缩放的比例 */private void arithScaleRate() {float scaleWidth = screenWidth / (float) imageWidth;float scaleHeight = screenHeight / (float) imageHeight;scaleRate = Math.min(scaleWidth, scaleHeight);}public float getScaleRate() {return scaleRate;}public int getImageWidth() {return imageWidth;}public void setImageWidth(int imageWidth) {this.imageWidth = imageWidth;}public int getImageHeight() {return imageHeight;}public void setImageHeight(int imageHeight) {this.imageHeight = imageHeight;}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {event.startTracking();return true;}return super.onKeyDown(keyCode, event);}@Overridepublic boolean onKeyUp(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK && event.isTracking() && !event.isCanceled()) {if (getScale() > 1.0f) {// If we're zoomed in, pressing Back jumps out to show the// entire image, otherwise Back returns the user to the gallery.zoomTo(1.0f);return true;}}return super.onKeyUp(keyCode, event);}protected Handler mHandler = new Handler();@Overridepublic void setImageBitmap(Bitmap bitmap) {super.setImageBitmap(bitmap);image = bitmap;// 计算适应屏幕的比例arithScaleRate();//缩放到屏幕大小zoomTo(scaleRate,screenWidth / 2f, screenHeight / 2f);//居中layoutToCenter();//imageView.zoomTo(scaleRate, screenWidth / 2, screenHeight / 2//center(true, true);}// Center as much as possible in one or both axis. Centering is// defined as follows: if the image is scaled down below the// view's dimensions then center it (literally). If the image// is scaled larger than the view and is translated out of view// then translate it back into view (i.e. eliminate black bars).protected void center(boolean horizontal, boolean vertical) {// if (mBitmapDisplayed.getBitmap() == null) {// return;// }if (image == null) {return;}Matrix m = getImageViewMatrix();RectF rect = new RectF(0, 0, image.getWidth(), image.getHeight());//RectF rect = new RectF(0, 0, imageWidth*getScale(), imageHeight*getScale());m.mapRect(rect);float height = rect.height();float width = rect.width();float deltaX = 0, deltaY = 0;if (vertical) {int viewHeight = getHeight();if (height < viewHeight) {deltaY = (viewHeight - height) / 2 - rect.top;} else if (rect.top > 0) {deltaY = -rect.top;} else if (rect.bottom < viewHeight) {deltaY = getHeight() - rect.bottom;}}if (horizontal) {int viewWidth = getWidth();if (width < viewWidth) {deltaX = (viewWidth - width) / 2 - rect.left;} else if (rect.left > 0) {deltaX = -rect.left;} else if (rect.right < viewWidth) {deltaX = viewWidth - rect.right;}}postTranslate(deltaX, deltaY);setImageMatrix(getImageViewMatrix());}private void init() {setScaleType(ImageView.ScaleType.MATRIX);}/** * 设置图片居中显示 */public void layoutToCenter(){//正在显示的图片实际宽高float width = imageWidth*getScale();float height = imageHeight*getScale();//空白区域宽高float fill_width = screenWidth - width;float fill_height = screenHeight - height;//需要移动的距离float tran_width = 0f;float tran_height = 0f;if(fill_width>0)tran_width = fill_width/2;if(fill_height>0)tran_height = fill_height/2;postTranslate(tran_width, tran_height);setImageMatrix(getImageViewMatrix());}protected float getValue(Matrix matrix, int whichValue) {matrix.getValues(mMatrixValues);mMinZoom =( screenWidth/2f)/imageWidth;return mMatrixValues[whichValue];}// Get the scale factor out of the matrix.protected float getScale(Matrix matrix) {return getValue(matrix, Matrix.MSCALE_X);}protected float getScale() {return getScale(mSuppMatrix);}// Combine the base matrix and the supp matrix to make the final matrix.protected Matrix getImageViewMatrix() {// The final matrix is computed as the concatentation of the base matrix// and the supplementary matrix.mDisplayMatrix.set(mBaseMatrix);mDisplayMatrix.postConcat(mSuppMatrix);return mDisplayMatrix;}static final float SCALE_RATE = 1.25F;// Sets the maximum zoom, which is a scale relative to the base matrix. It// is calculated to show the image at 400% zoom regardless of screen or// image orientation. If in the future we decode the full 3 megapixel image,// rather than the current 1024x768, this should be changed down to 200%.protected float maxZoom() {if (image == null) {return 1F;}float fw = (float) image.getWidth() / (float) mThisWidth;float fh = (float) image.getHeight() / (float) mThisHeight;float max = Math.max(fw, fh) * 4;return max;}protected void zoomTo(float scale, float centerX, float centerY) {if (scale > mMaxZoom) {scale = mMaxZoom;} else if (scale < mMinZoom) {scale = mMinZoom;}float oldScale = getScale();float deltaScale = scale / oldScale;mSuppMatrix.postScale(deltaScale, deltaScale, centerX, centerY);setImageMatrix(getImageViewMatrix());center(true, true);}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();mHandler.post(new Runnable() {public void run() {long now = System.currentTimeMillis();float currentMs = Math.min(durationMs, now - startTime);float target = oldScale + (incrementPerMs * currentMs);zoomTo(target, centerX, centerY);if (currentMs < durationMs) {mHandler.post(this);}}});}protected void zoomTo(float scale) {float cx = getWidth() / 2F;float cy = getHeight() / 2F;zoomTo(scale, cx, cy);}protected void zoomToPoint(float scale, float pointX, float pointY) {float cx = getWidth() / 2F;float cy = getHeight() / 2F;panBy(cx - pointX, cy - pointY);zoomTo(scale, cx, cy);}protected void zoomIn() {zoomIn(SCALE_RATE);}protected void zoomOut() {zoomOut(SCALE_RATE);}protected void zoomIn(float rate) {if (getScale() >= mMaxZoom) {return; // Don't let the user zoom into the molecular level.} else if (getScale() <= mMinZoom) {return;}if (image == null) {return;}float cx = getWidth() / 2F;float cy = getHeight() / 2F;mSuppMatrix.postScale(rate, rate, cx, cy);setImageMatrix(getImageViewMatrix());}protected void zoomOut(float rate) {if (image == null) {return;}float cx = getWidth() / 2F;float cy = getHeight() / 2F;// Zoom out to at most 1x.Matrix tmp = new Matrix(mSuppMatrix);tmp.postScale(1F / rate, 1F / rate, cx, cy);if (getScale(tmp) < 1F) {mSuppMatrix.setScale(1F, 1F, cx, cy);} else {mSuppMatrix.postScale(1F / rate, 1F / rate, cx, cy);}setImageMatrix(getImageViewMatrix());center(true, true);}public void postTranslate(float dx, float dy) {mSuppMatrix.postTranslate(dx, dy);setImageMatrix(getImageViewMatrix());}float _dy=0.0f;protected void postTranslateDur( final float dy, final float durationMs) {_dy=0.0f;final float incrementPerMs = dy / durationMs;final long startTime = System.currentTimeMillis();mHandler.post(new Runnable() {public void run() {long now = System.currentTimeMillis();float currentMs = Math.min(durationMs, now - startTime);postTranslate(0, incrementPerMs*currentMs-_dy);_dy=incrementPerMs*currentMs;if (currentMs < durationMs) {mHandler.post(this);}}});}protected void panBy(float dx, float dy) {postTranslate(dx, dy);setImageMatrix(getImageViewMatrix());}}