Android Bitmap压缩

Android View截屏长图拼接（RecyclerView）

我们在实际使用中，往往图片转化成Bitmap，对Bitmap操作的时候（如:截屏分享等），可能Bitmap会过大，导致无视实现对应功能。那么我们就需要对Bitmap进行压缩处理。

 public static Bitmap compressBitmap(Bitmap bitmap, int maxSize) {Bitmap newBitmap;ByteArrayOutputStream baos = new ByteArrayOutputStream();// 质量压缩方法,这里100表示不压缩,把压缩后的数据存放到baos中bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);InputStream inputStream = new ByteArrayInputStream(baos.toByteArray());BitmapFactory.Options newOpts = new BitmapFactory.Options();newOpts.inJustDecodeBounds = false;//为true的时候表示只读边,不读内容newOpts.inPurgeable = true;// 同时设置才会有效newOpts.inInputShareable = true;//当系统内存不够时候图片自动被回收// Do not compressnewOpts.inPreferredConfig = Bitmap.Config.RGB_565;//如果使用ARGB-8888连续压缩两个10M图分分钟oom，而使用4444比565还糊。。long length = baos.toByteArray().length;if (length / 1024 > 4 * 1024) {int a = 2;while (length / 1024 / a > 4 * 1024) {a = a + 1;}newOpts.inSampleSize = a;} else {newOpts.inSampleSize = 1;}newBitmap = BitmapFactory.decodeStream(inputStream, new Rect(), newOpts);if (maxSize > 100) {ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();int options = 100;newBitmap.compress(Bitmap.CompressFormat.PNG, options, byteArrayOutputStream);if (byteArrayOutputStream.toByteArray().length / 1024 > maxSize) {while (byteArrayOutputStream.toByteArray().length / 1024 > maxSize) {// Clean up osbyteArrayOutputStream.reset();// interval 10options -= 5;newBitmap.compress(Bitmap.CompressFormat.PNG, options, byteArrayOutputStream);}byte[] bytes = byteArrayOutputStream.toByteArray();newBitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);}FileFileUtils.closeSilently(byteArrayOutputStream);}FileFileUtils.closeSilently(baos);FileFileUtils.closeSilently(inputStream);return newBitmap;}public static void closeSilently(Closeable c) {if (c == null) return;try {c.close();} catch (Throwable t) {// Do nothing}}