Android-图片压缩-2行搞定图片压缩【2019】

/*
压缩路径下的文件
 */
private File imageFactory(String picPath){
    BitmapFactory.Options o=new BitmapFactory.Options();
    Bitmap bitmap=BitmapFactory.decodeFile(picPath, o);
    bitmap=Bitmap.createScaledBitmap(bitmap, 400, 400, false);
    File root= getExternalCacheDir();
    File pic=new File(root,"test.jpg");
    try {
        FileOutputStream fos=new FileOutputStream(pic);
        bitmap.compress(Bitmap.CompressFormat.JPEG,50,fos);
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    return pic;
}

bitmap=Bitmap.createScaledBitmap(bitmap, 400, 400, false);

ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 50, baos);
Bitmap newBitmap = BitmapFactory.decodeStream(new ByteArrayInputStream(baos.toByteArray()), null, null);