android 上传图片(压缩) Bitmap 转File

/**
* 压缩图片（质量压缩）
* @param bitmap
*/
public static File compressImage(Bitmap bitmap) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);//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
int options = 100;
while (baos.toByteArray().length / 1024 > 500) {  //循环判断如果压缩后图片是否大于500kb,大于继续压缩
baos.reset();//重置baos即清空baos
options -= 10;//每次都减少10
bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中
long length = baos.toByteArray().length;
}
SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmss");
Date date = new Date(System.currentTimeMillis());
String filename = format.format(date);
File file = new File(Environment.getExternalStorageDirectory(),filename+".png");
try {
FileOutputStream fos = new FileOutputStream(file);
try {
fos.write(baos.toByteArray());
fos.flush();
fos.close();
} catch (IOException e) {
BAFLogger.e(TAG,e.getMessage());
e.printStackTrace();
}
} catch (FileNotFoundException e) {
BAFLogger.e(TAG,e.getMessage());
e.printStackTrace();
}
recycleBitmap(bitmap);
return file;
}

//释放

public static void recycleBitmap(Bitmap... bitmaps) {
if (bitmaps==null) {
return;
}
for (Bitmap bm : bitmaps) {
if (null != bm && !bm.isRecycled()) {
bm.recycle();
}
}
}