android中有关图片的处理

/**  * 按照比例放大或者缩小图片**/public static Bitmap scaleImage(Bitmap oldImage, int newW, int newH) {return scaleImage(oldImage,newW,  newH,false);}public static Bitmap scaleImage(Bitmap oldImage, int newW, int newH,boolean isRecycleOld) {if (oldImage == null)return null;int oldWidth = oldImage.getWidth();int oldHeight = oldImage.getHeight();Matrix matrix = new Matrix();matrix.postScale((float) newW / oldWidth, (float) newH / oldHeight);Bitmap resizedBitmap = Bitmap.createBitmap(oldImage, 0, 0, oldWidth,oldHeight, matrix, true);if(isRecycleOld){oldImage.recycle();}return resizedBitmap;}

/** * bitmap to byte[] *  * @param bitmap * @return */public static byte[] flattenBitmap(Bitmap bitmap) {if(bitmap ==null) return null;int size = bitmap.getWidth() * bitmap.getHeight() * 4;ByteArrayOutputStream out = new ByteArrayOutputStream(size);try {bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);out.flush();out.close();return out.toByteArray();} catch (IOException e) {return null;}}/** * byte[] to bitmap *  * @param bytes * @return */public static Bitmap bytesToBitmap(byte[] bytes) {if (bytes == null)return null;return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);}

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