Android PNG 到位图 --- SkImageDecoder::Factory 返回 null

Question

我正在尝试从我的 Environment.getExternalStorageDirectory() 加载屏幕截图并尝试将其转换为位图

 public void onPictureTaken(String path) throws IOException {

    String photoPath = filepath + "/" + path;; //UPDATE WITH YOUR OWN JPG FILE

    File directory = new File (filepath);
    File file = new File(directory, path);

    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(photoPath, options);

    // Calculate inSampleSize
    options.inSampleSize = 4;
    options.inJustDecodeBounds = false;
    BitmapFactory.decodeFile(photoPath, options);

}

--- SkImageDecoder::Factory returned null

这是调用 onPictureTaken 的函数:

 private void observeSceenshot(){
    filepath = Environment.getExternalStorageDirectory()
            + File.separator + Environment.DIRECTORY_PICTURES
            + File.separator + "Screenshots";
    Log.d(TAG, filepath);

    FileObserver fileObserver = new FileObserver(filepath, FileObserver.CREATE) {
        @Override
        public void onEvent(int event, String path) {
            Log.d(TAG, event + " " + path);
            try {
                onPictureTaken(path);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    };

    fileObserver.startWatching();
}

有人知道如何解决这个问题吗？也许是因为我的 png 太大了(1280x720)？我也试过这个解决方案，结果相同: http://developer.android.com/training/displaying-bitmaps/load-bitmap.html

编辑:这是日志

03-02 11:56:19.806 11581-11716/com.example.chilred_pc.myapplication D/DBG_com.example.chilred_pc.myapplication.ObserveScreenshots: 256 Screenshot_2016-03-02-11-56-19.png 03-02 11:56:19.806 11581-11716/com.example.chilred_pc.myapplication D/directory: /storage/emulated/0/Pictures/Screenshots 03-02 11:56:19.806 11581-11716/com.example.chilred_pc.myapplication D/file: /storage/emulated/0/Pictures/Screenshots/Screenshot_2016-03-01-16-38-08.png 03-02 11:56:19.806 11581-11716/com.example.chilred_pc.myapplication D/fileSize: 35061 03-02 11:56:19.807 11581-11716/com.example.chilred_pc.myapplication D/skia: --- SkImageDecoder::Factory returned null 03-02 11:56:19.808 11581-11716/com.example.chilred_pc.myapplication D/skia: --- decoder->decode returned false

Answer 1

我认为问题的解决方案是屏幕截图需要几秒钟才能创建图像。所以我试着让系统停止几秒钟，现在它开始工作了。

> SystemClock.sleep(3000);

但最后我使用了另一种方法，如下所示: Detect only screenshot with FileObserver Android