BitMap工具类

<span style="font-size:18px;color:#009900;">public final class BitmapUtil {

 /**
  *取得指定区域的图形
  * @param source
  * @param x
  * @param y
  * @param width
  * @param height
  * @return
  */
 public static Bitmap getBitmap(Bitmap source,int x,int y,int width,int height) {
  Bitmap bitmap = Bitmap.createBitmap(source, x, y, width, height);
  return bitmap;
 }

 /**
  * 从大图中截取小图
  * @param r
  * @param resourseId
  * @param row
  * @param col
  * @param rowTotal
  * @param colTotal
  * @return
  */
 public static Bitmap getImage(Context context,Bitmap source,
   int row,
   int col,
   int rowTotal,
   int colTotal,
   float multiple,
   boolean isRecycle) {
  Bitmap temp = getBitmap(source,
    (col-1)*source.getWidth()/colTotal,
    (row-1)*source.getHeight()/rowTotal,
    source.getWidth()/colTotal,
    source.getHeight()/rowTotal);
  
  if(isRecycle) {
   recycleBitmap(source);
  }
  if(multiple != 1.0) {
   Matrix matrix = new Matrix();
            matrix.postScale(multiple, multiple);
            temp = Bitmap.createBitmap(temp, 0, 0,temp.getWidth(), temp.getHeight(), matrix, true);
  }
  return temp;
 }
 /**
  * 从大图中截取小图
  * @param r
  * @param resourseId
  * @param row
  * @param col
  * @param rowTotal
  * @param colTotal
  * @return
  */
 public static Drawable getDrawableImage(Context context,Bitmap source,int row,int col,int rowTotal,int colTotal,float multiple) {

  Bitmap temp = getBitmap(source, (col-1)*source.getWidth()/colTotal, (row-1)*source.getHeight()/rowTotal, source.getWidth()/colTotal, source.getHeight()/rowTotal);
  if(multiple != 1.0) {
   Matrix matrix = new Matrix();
            matrix.postScale(multiple, multiple);
            temp = Bitmap.createBitmap(temp, 0, 0,temp.getWidth(), temp.getHeight(), matrix, true);
  }
  Drawable d = new BitmapDrawable(context.getResources(),temp);
  return d;
 }

 public static Drawable[] getDrawables(Context context,int resourseId,int row,int col,float multiple) {
  Drawable drawables[] = new Drawable[row*col];
  Bitmap source = decodeResource(context, resourseId);
  int temp = 0;
  for(int i=1; i<=row; i++) {
   for(int j=1; j<=col; j++) {
    drawables[temp] = getDrawableImage(context,source, i, j, row, col,multiple);
    temp ++;
   }
  }
  if(source != null && !source.isRecycled()) {
   source.recycle();
   source = null;
  }
  return drawables;
 }

 public static Drawable[] getDrawables(Context context,String resName,int row,int col,float multiple) {
  Drawable drawables[] = new Drawable[row*col];
  Bitmap source = decodeBitmapFromAssets(resName);
  int temp = 0;
  for(int i=1; i<=row; i++) {
   for(int j=1; j<=col; j++) {
    drawables[temp] = getDrawableImage(context,source, i, j, row, col,multiple);
    temp ++;
   }
  }
  if(source != null && !source.isRecycled()) {
   source.recycle();
   source = null;
  }
  return drawables;
 }
 /**
  * 根据一张大图，返回切割后的图元数组
  * @param resourseId:资源id
  * @param row：总行数
  * @param col：总列数
  * multiple:图片缩放的倍数1:表示不变，2表示放大为原来的2倍
  * @return
  */
 public static Bitmap[] getBitmaps(Context context,int resourseId,int row,int col,float multiple) {
  Bitmap bitmaps[] = new Bitmap[row*col];
  Bitmap source = decodeResource(context, resourseId);
  int temp = 0;
  for(int i=1; i<=row; i++) {
   for(int j=1; j<=col; j++) {
    bitmaps[temp] = getImage(context,source, i, j, row, col,multiple,false);
    temp ++;
   }
  }
  if(source != null && !source.isRecycled()) {
   source.recycle();
   source = null;
  }
  return bitmaps;
 }

 public static Bitmap[] getBitmaps(Context context,String resName,int row,int col,float multiple) {
  Bitmap bitmaps[] = new Bitmap[row*col];
  Bitmap source = decodeBitmapFromAssets(resName);
  int temp = 0;
  for(int i=1; i<=row; i++) {
   for(int j=1; j<=col; j++) {
    bitmaps[temp] = getImage(context,source, i, j, row, col,multiple,false);
    temp ++;
   }
  }
  if(source != null && !source.isRecycled()) {
   source.recycle();
   source = null;
  }
  return bitmaps;
 }

 public static Bitmap[] getBitmapsByBitmap(Context context,Bitmap source,int row,int col,float multiple) {
  Bitmap bitmaps[] = new Bitmap[row*col];
  int temp = 0;
  for(int i=1; i<=row; i++) {
   for(int j=1; j<=col; j++) {
    bitmaps[temp] = getImage(context,source, i, j, row, col,multiple,false);
    temp ++;
   }
  }
  return bitmaps;
 }

 public static Bitmap decodeResource(Context context,int resourseId) {
  BitmapFactory.Options opt = new BitmapFactory.Options();
     opt.inPreferredConfig = Bitmap.Config.ARGB_8888;
     opt.inPurgeable = true;
     opt.inInputShareable = true; //需把 inPurgeable设置为true，否则被忽略
        //获取资源图片
     InputStream is = context.getResources().openRawResource(resourseId);
     return BitmapFactory.decodeStream(is,null,opt);  //decodeStream直接调用JNI>>nativeDecodeAsset()来完成decode，无需再使用java层的createBitmap，从而节省了java层的空间
 }

 /**
  * 从assets文件下解析图片
  * @param resName
  * @return
  */
 public static Bitmap decodeBitmapFromAssets(String resName) {
  BitmapFactory.Options options = new BitmapFactory.Options();
  options.inPreferredConfig = Bitmap.Config.ARGB_8888;
  options.inPurgeable = true;
  options.inInputShareable = true;
  InputStream in = null;
  try {
   //in = AssetsResourcesUtil.openResource(resName);
   in =context.getAssets().open(resName);
  } catch (IOException e) {
   e.printStackTrace();
  }
  return BitmapFactory.decodeStream(in, null, options);
 }

 /**
  * 回收不用的bitmap
  * @param b
  */
 public static void recycleBitmap(Bitmap b) {
  if(b != null && !b.isRecycled()) {
   b.recycle();
   b = null;
  }
 }
 /**
  * 获取某些连在一起的图片的某一个画面（图片为横着排的情况）
  * @param source
  * @param frameIndex  从1开始
  * @param totalCount
  * @return
  */
 public static Bitmap getOneFrameImg(Bitmap source, int frameIndex, int totalCount){
   int singleW = source.getWidth() / totalCount;
   return Bitmap.createBitmap(source,(frameIndex - 1) * singleW,0, singleW,source.getHeight());
 }

 public static void recycleBitmaps(Bitmap bitmaps[]) {
  if(bitmaps != null){
   for(Bitmap b:bitmaps) {
    recycleBitmap(b);
   }
   bitmaps = null;
  }
 }

 /**
  * drawable转换成bitmap
  * @param drawable
  * @return
  */
 public static Bitmap drawableToBitmap(Drawable drawable) {
  if(drawable instanceof BitmapDrawable) {
   return ((BitmapDrawable)drawable).getBitmap();
  }else if(drawable instanceof NinePatchDrawable) {
   Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), drawable.getOpacity() != PixelFormat.OPAQUE
          ? Bitmap.Config.ARGB_8888 : Bitmap.Config.ARGB_8888);
   Canvas canvas = new Canvas(bitmap);
   drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());

   drawable.draw(canvas);
   return bitmap;
  }else {
   throw new IllegalArgumentException("can not support this drawable to bitmap now!!!");
  }
 }</span>