Android Bitmap 工具类

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!!!");
		}
	}