package com.jiangjie.utils;   import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import andROId.content.Context; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.Bitmap.config; public class BitmapUtils {      /**   * 缩放图片   */  public static void bitmapScale(Bitmap baseBitmap, Paint paint, float x, float y) {   // 因为要将图片放大，所以要根据放大的尺寸重新创建Bitmap   Bitmap scaleBitmap = Bitmap.createBitmap(     (int) (baseBitmap.getWidth() * x),     (int) (baseBitmap.getHeight() * y), baseBitmap.getConfig());   Canvas canvas = new Canvas(scaleBitmap);   // 初始化Matrix对象   Matrix matrix = new Matrix();   // 根据传入的参数设置缩放比例   matrix.setScale(x, y);   // 根据缩放比例，把图片draw到Canvas上   canvas.drawBitmap(baseBitmap, matrix,paint);  }    /**   * 图片旋转   */  public static void bitmaPRotate(Bitmap baseBitmap, Paint paint,float degrees) {   // 创建一个和原图一样大小的图片   Bitmap afterBitmap = Bitmap.createBitmap(baseBitmap.getWidth(),     baseBitmap.getHeight(), baseBitmap.getConfig());   Canvas canvas = new Canvas(afterBitmap);   Matrix matrix = new Matrix();   // 根据原图的中心位置旋转   matrix.setRotate(degrees, baseBitmap.getWidth() / 2,     baseBitmap.getHeight() / 2);   canvas.drawBitmap(baseBitmap, matrix, paint);  }    /**   * 图片移动   */  public static void bitmapTranslate(Bitmap baseBitmap, Paint paint, float dx, float dy) {   // 需要根据移动的距离来创建图片的拷贝图大小   Bitmap afterBitmap = Bitmap.createBitmap(     (int) (baseBitmap.getWidth() + dx),     (int) (baseBitmap.getHeight() + dy), baseBitmap.getConfig());   Canvas canvas = new Canvas(afterBitmap);   Matrix matrix = new Matrix();   // 设置移动的距离   matrix.setTranslate(dx, dy);   canvas.drawBitmap(baseBitmap, matrix, paint);  }    /**   * 倾斜图片   */  public static void bitmapSkew(Bitmap baseBitmap, Paint paint, float dx, float dy) {   // 根据图片的倾斜比例，计算变换后图片的大小，   Bitmap afterBitmap = Bitmap.createBitmap(baseBitmap.getWidth()     + (int) (baseBitmap.getWidth() * dx), baseBitmap.getHeight()     + (int) (baseBitmap.getHeight() * dy), baseBitmap.getConfig());   Canvas canvas = new Canvas(afterBitmap);   Matrix matrix = new Matrix();   // 设置图片倾斜的比例   matrix.setSkew(dx, dy);   canvas.drawBitmap(baseBitmap, matrix, paint);  }    public static Bitmap decodeFromResource(Context context, int id) {   Resources res = context.getResources();   Bitmap bitmap = BitmapFactory.decodeResource(res,id).copy(Bitmap.Config.argB_8888, true);   return bitmap;  }     /**   * 保存图片到SD卡   */  public static void saveToSdCard(String path, Bitmap bitmap) {  if (null != bitmap && null != path && !path.equalsIgnoreCase("")) {  try {  File file = new File(path);  FileOutputStream outputStream = null;  //创建文件，并写入内容  outputStream = new FileOutputStream(new File(path), true);  bitmap.COMPress(Bitmap.CompressFormat.PNG, 30, outputStream);  outputStream.flush();  outputStream.close();  } catch (FileNotFoundException e) {  e.printStackTrace();  } catch (IOException e) {  e.printStackTrace();  }   }  }    /**   * 复制bitmap   */  public static Bitmap duplicateBitmap(Bitmap bmpSrc, int width, int height) {  if (null == bmpSrc) {  return null;  }    int bmpSrcWidth = bmpSrc.getWidth();  int bmpSrcHeight = bmpSrc.getHeight();    Bitmap bmpDest = Bitmap.createBitmap(width, height, Config.ARGB_8888);  if (null != bmpDest) {  Canvas canvas = new Canvas(bmpDest);  Rect viewRect = new Rect();  final Rect rect = new Rect(0, 0, bmpSrcWidth, bmpSrcHeight);  if (bmpSrcWidth <= width && bmpSrcHeight <= height) {  viewRect.set(rect);  } else if (bmpSrcHeight > height && bmpSrcWidth <= width) {  viewRect.set(0, 0, bmpSrcWidth, height);  } else if (bmpSrcHeight <= height && bmpSrcWidth > width) {  viewRect.set(0, 0, width, bmpSrcWidth);  } else if (bmpSrcHeight > height && bmpSrcWidth > width) {  viewRect.set(0, 0, width, height);  }  canvas.drawBitmap(bmpSrc, rect, viewRect, null);  }    return bmpDest;  }    /**   * 复制bitmap   */  public static Bitmap duplicateBitmap(Bitmap bmpSrc) {  if (null == bmpSrc) {  return null;  }    int bmpSrcWidth = bmpSrc.getWidth();  int bmpSrcHeight = bmpSrc.getHeight();    Bitmap bmpDest = Bitmap.createBitmap(bmpSrcWidth, bmpSrcHeight,  Config.ARGB_8888);  if (null != bmpDest) {  Canvas canvas = new Canvas(bmpDest);  final Rect rect = new Rect(0, 0, bmpSrcWidth, bmpSrcHeight);    canvas.drawBitmap(bmpSrc, rect, rect, null);  }    return bmpDest;  }    /**   * bitmap转字节码   */  public static byte[] bitampToByteArray(Bitmap bitmap) {  byte[] array = null;  try {  if (null != bitmap) {  ByteArrayOutputStream os = new ByteArrayOutputStream();  bitmap.compress(Bitmap.CompressFormat.PNG, 100, os);  array = os.toByteArray();  os.close();  }  } catch (IOException e) {  e.printStackTrace();  }    return array;  }    /**   * 字节码转bitmap   */  public static Bitmap byteArrayToBitmap(byte[] array) {  if (null == array) {  return null;  }    return BitmapFactory.decodeByteArray(array, 0, array.length);  }   }  

 package com.jiangjie.ps;   import com.jiangjie.utils.PaintConstants;   import android.content.Context; import android.graphics.Bitmap; import android.graphics.Bitmap.Config; import android.graphics.BlurMaskFilter; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.Path; import android.graphics.PointF; import android.graphics.PorterDuff.Mode; import android.graphics.PorterDuffXfermode; import android.graphics.RectF; import android.graphics.drawable.BitmapDrawable; import android.util.AttributeSet; import android.util.DisplayMetrics; import android.util.FloatMath; import android.util.LOG; import android.view.MotionEvent; import android.view.View; import android.widget.ImageView;   public class ImageTouchView extends ImageView{  public Matrix matrix = new Matrix();    Matrix savedMatrix = new Matrix();  /** 屏幕的分辨率*/  private DisplayMetrics dm;  /** 当前模式*/  int mode = PaintConstants.MODE.NONE;    /** 存储float类型的x，y值，就是你点下的坐标的X和Y*/  PointF prev = new PointF();  PointF curPosition = new PointF();  PointF mid = new PointF();  float dist = 1f;    float oldRotation = 0;   float oldDistX = 1f;  float oldDistY = 1f;    /**位图对象*/  private Bitmap bitmap = null;  private Paint paint;  private Context context;    private Path path;  private Path tempPath;  //定义一个内存中的图片，该图片将作为缓冲区  Bitmap cacheBitmap = null;    //定义cacheBitmap上的Canvas对象  Canvas cacheCanvas = null;  private Paint cachePaint = null;    private String TAG = "APP";    int x = 0;   int y = 0;       public ImageTouchView(Context context) {  suPEr(context);  }    public ImageTouchView(Context context, AttributeSet attrs) {  super(context, attrs);  this.context = context;  Log.i(TAG, "ImageTouchView(Context context, AttributeSet attrs)=>");    SETUPView();  }    @override  protected void onDraw(Canvas canvas) {   super.onDraw(canvas);    if(mode == PaintConstants.MODE.COLORING){  canvas.drawPath(tempPath, paint);  }    }    public void setupview(){    //获取屏幕分辨率,需要根据分辨率来使用图片居中  dm = getContext().getResources().getDisplayMetrics();  //根据MyImageView来获取bitmap对象  BitmapDrawable bd = (BitmapDrawable)this.getDrawable();  if(bd != null){  bitmap = bd.getBitmap();  // bitmap = setBitmapAlpha(bitmap, 100);  center(true, true);  }   setCoverBitmap(bitmap);  this.setImageMatrix(matrix);    this.setOnTouchListener(new OnTouchListener() {  @Override  public boolean onTouch(View v, MotionEvent event) {  Matrix matrixTemp = new Matrix();  matrixTemp.set(matrix);  //view的触摸坐标的转换  matrixTemp.invert(matrixTemp);  Log.i(TAG, "Touch screen.");    switch (event.getAction() & MotionEvent.ACTION_MASK) {  // 主点按下  case MotionEvent.ACTION_DOWN:   savedMatrix.set(matrix);   prev.set(event.getX(), event.getY());     float[] pointPrevInit = new float[]{prev.x, prev.y};   matrixTemp.mapPoints(pointPrevInit);   path.moveTo(pointPrevInit[0], pointPrevInit[1]);   tempPath.moveTo(event.getX(), event.getY());     mode = PaintConstants.MODE.Drag;   Log.i(TAG, "ACTION_DOWN=>.");   break;   // 副点按下  case MotionEvent.ACTION_POINTER_DOWN:   dist = spacing(event);   oldRotation = rotation(event);    oldDistX = spacingX(event);   oldDistY = spacingY(event);   // 如果连续两点距离大于10，则判定为多点模式   if (spacing(event) > 10f) {   savedMatrix.set(matrix);   midPoint(mid, event);   mode = PaintConstants.MODE.ZOOM;   }   break;  case MotionEvent.ACTION_UP:   Log.i(TAG, "ACTION_UP=>.");   if(mode == PaintConstants.MODE.COLORING){   cachePaint.setColor(PaintConstants.PEN_COLOR);   cachePaint.setstrokeWidth(PaintConstants.PEN_SIZE);   cachePaint.setAlpha(PaintConstants.TRANSPARENT);    cachePaint.setMaskFilter(new BlurMaskFilter(5, PaintConstants.BLUR_TYPE));      cacheCanvas.drawPath(path, cachePaint);   path.reset();   tempPath.reset();   }   break;    case MotionEvent.ACTION_POINTER_UP:   mode = PaintConstants.MODE.NONE;   break;    case MotionEvent.ACTION_MOVE:   if(!PaintConstants.SELECTOR.KEEP_IMAGE){   if (mode == PaintConstants.MODE.DRAG) {   matrix.set(savedMatrix);   matrix.postTranslate(event.getX() - prev.x, event.getY() - prev.y);   } else if (mode == PaintConstants.MODE.ZOOM) {   float rotation = (rotation(event) - oldRotation)/2;    float newDistX = spacingX(event);   float newDistY = spacingY(event);    float scaleX = newDistX-oldDistX;   float scaleY = newDistY-oldDistY;     float newDist = spacing(event);   if (newDist > 10f) {   matrix.set(savedMatrix);   float tScale = newDist / dist;   tScale = tScale>1&#63;1+((tScale-1)/2):1-(1-tScale)/2;   if(PaintConstants.SELECTOR.KEEP_SCALE){    matrix.postScale(tScale, tScale, mid.x, mid.y);// s放    }else{    if(Math.abs(scaleX)>=Math.abs(scaleY)){    matrix.postScale(tScale, 1, mid.x, mid.y);// s放     }else{    matrix.postScale(1, tScale, mid.x, mid.y);// s放    }   }   if(PaintConstants.SELECTOR.HAIR_RURN)    matrix.postRotate(rotation, mid.x, mid.y);// 旋D    }   }   }else{   float[] pointPrev = new float[]{prev.x, prev.y};   float[] pointStop= new float[]{event.getX(), event.getY()};       //view的触摸坐标的转换   matrixTemp.mapPoints(pointPrev);   matrixTemp.mapPoints(pointStop);      if(PaintConstants.SELECTOR.COLORING){   //染色功能   mode = PaintConstants.MODE.COLORING;   paint.reset();   paint = new Paint(Paint.DITHER_FLAG);   paint.setColor(Color.red);   //设置画笔风格   paint.setStyle(Paint.Style.STROKE);   paint.setStrokeWidth(1);   //反锯齿   paint.setAntiAlias(true);   paint.setDither(true);    paint.setColor(PaintConstants.PEN_COLOR);   paint.setStrokeWidth(PaintConstants.PEN_SIZE);     path.quadTo(pointPrev[0],pointPrev[1],pointStop[0],pointStop[1]);   tempPath.quadTo(prev.x, prev.y,event.getX(), event.getY());      // 更新开始点的位置   prev.set(event.getX(), event.getY());     ImageTouchView.this.setImageBitmap(cacheBitmap);      }else if(PaintConstants.SELECTOR.ERASE){   //橡皮擦功能     mode = PaintConstants.MODE.ERASE;     paint.reset();   paint.setColor(Color.TRANSPARENT);   paint.setAntiAlias(false);   paint.setStyle(Paint.Style.STROKE);   paint.setStrokeWidth(16);   paint.setStrokeJoin(Paint.Join.ROUND);   paint.setStrokeCap(Paint.Cap.ROUND);   paint.setAlpha(0);    paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));   paint.setStrokeWidth(PaintConstants.ERASE_SIZE);     prev.set(event.getX(), event.getY());      cacheCanvas.drawLine(pointPrev[0],pointPrev[1],pointStop[0],pointStop[1], paint);   ImageTouchView.this.setImageBitmap(cacheBitmap);    }   }  }  ImageTouchView.this.setImageMatrix(matrix);  invalidate();    return true;  }  });  }    /**  * 横向、纵向居中  */  protected void center(boolean horizontal, boolean vertical) {  RectF rect = new RectF(0, 0, bitmap.getWidth(), bitmap.getHeight());    float height = rect.height();  float width = rect.width();    float deltaX = 0, deltaY = 0;    if (vertical) {  // 图片小于屏幕大小，则居中显示。大于屏幕，上方留空则往上移，下方留空则往下移  int screenHeight = dm.heightPixels;  if (height < screenHeight) {  deltaY = (screenHeight - height) / 2 - rect.top;  } else if (rect.top > 0) {  deltaY = -rect.top;  } else if (rect.bottom < screenHeight) {  deltaY = this.getHeight() - rect.bottom;  }  }    if (horizontal) {  int screenWidth = dm.widthPixels;  if (width < screenWidth) {  deltaX = (screenWidth - width) / 2 - rect.left;  } else if (rect.left > 0) {  deltaX = -rect.left;  } else if (rect.right < screenWidth) {  deltaX = screenWidth - rect.right;  }  }  matrix.postTranslate(deltaX, deltaY);  }     private float spacingX(MotionEvent event) {   float x = event.getX(0) - event.getX(1);   return x;  }   private float spacingY(MotionEvent event) {   float y = event.getY(0) - event.getY(1);   return y;   }    // 取旋转角度   private float rotation(MotionEvent event) {   double delta_x = (event.getX(0) - event.getX(1));   double delta_y = (event.getY(0) - event.getY(1));   double radians = Math.atan2(delta_y, delta_x);   return (float) Math.toDegrees(radians);   }     /**  * 两点的距离  */  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);  }    /**  * 两点的中点  */  private void midPoint(PointF point, MotionEvent event) {  float x = event.getX(0) + event.getX(1);  float y = event.getY(0) + event.getY(1);  point.set(x / 2, y / 2);  }      /**   *   * @param bm   * @note set cover bitmap , which overlay on background.   */   private void setCoverBitmap(Bitmap bitmap) {   // setting paint   paint = new Paint();     cacheBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);   cacheCanvas = new Canvas();  cacheCanvas.setBitmap(cacheBitmap);  cacheCanvas.drawBitmap( bitmap, 0, 0, null);     path = new Path();  tempPath = new Path();    //设置画笔的颜色  cachePaint = new Paint();  //设置画笔风格  cachePaint.setStyle(Paint.Style.STROKE);  //反锯齿  cachePaint.setAntiAlias(true);  cachePaint.setStrokeJoin(Paint.Join.ROUND);  cachePaint.setStrokeCap(Paint.Cap.ROUND);  cachePaint.setXfermode(new PorterDuffXfermode(Mode.SRC_ATOP));  //设置画笔模糊效果  cachePaint.setMaskFilter(new BlurMaskFilter(5, PaintConstants.BLUR_TYPE));    }    }