protected AssetFileDescriptor openVideoThumbnailCleared(long id, CancellationSignal signal)
        throws FileNotFoundException {
    final ContentResolver resolver = getContext().getContentResolver();
    Cursor cursor = null;
    try {
        cursor = resolver.query(Video.Thumbnails.EXTERNAL_CONTENT_URI,
                VideoThumbnailQuery.PROJECTION, Video.Thumbnails.VIDEO_ID + "=" + id, null,
                null);
        if (cursor.moveToFirst()) {
            final String data = cursor.getString(VideoThumbnailQuery._DATA);
            return new AssetFileDescriptor(ParcelFileDescriptor.open(
                    new File(data), ParcelFileDescriptor.MODE_READ_ONLY), 0,
                    AssetFileDescriptor.UNKNOWN_LENGTH);
        }
    } finally {
        IoUtils.closeQuietly(cursor);
    }
    return null;
}
 

protected AssetFileDescriptor openVideoThumbnailCleared(long id, CancellationSignal signal)
        throws FileNotFoundException {
    final ContentResolver resolver = getContext().getContentResolver();
    Cursor cursor = null;
    try {
        cursor = resolver.query(Video.Thumbnails.EXTERNAL_CONTENT_URI,
                VideoThumbnailQuery.PROJECTION, Video.Thumbnails.VIDEO_ID + "=" + id, null,
                null);
        if (cursor.moveToFirst()) {
            final String data = cursor.getString(VideoThumbnailQuery._DATA);
            return new AssetFileDescriptor(ParcelFileDescriptor.open(
                    new File(data), ParcelFileDescriptor.MODE_READ_ONLY), 0,
                    AssetFileDescriptor.UNKNOWN_LENGTH);
        }
    } finally {
        IoUtils.closeQuietly(cursor);
    }
    return null;
}
 

/**
 * Opens a stream to the given URI.
 * @return Never returns null.
 * @throws Throws an InvalidArgumentException for relative URIs. Relative URIs should be
 *     resolved before being passed into this function.
 * @throws Throws an IOException if the URI cannot be opened.
 */
public OutputStream openOutputStream(Uri uri, boolean append) throws IOException {
    assertBackgroundThread();
    switch (getUriType(uri)) {
        case URI_TYPE_FILE: {
            File localFile = new File(uri.getPath());
            File parent = localFile.getParentFile();
            if (parent != null) {
                parent.mkdirs();
            }
            return new FileOutputStream(localFile, append);
        }
        case URI_TYPE_CONTENT:
        case URI_TYPE_RESOURCE: {
            AssetFileDescriptor assetFd = contentResolver.openAssetFileDescriptor(uri, append ? "wa" : "w");
            return assetFd.createOutputStream();
        }
    }
    throw new FileNotFoundException("URI not supported by CordovaResourceApi: " + uri);
}
 

public static int getDuration(MediaPlayer mediaPlayer, AssetFileDescriptor afd) {
    int duration = 500;

    try {
        mediaPlayer.reset();
        mediaPlayer.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
        afd.close();
        mediaPlayer.prepare();
        duration = mediaPlayer.getDuration();
    } catch(IOException e) {
        Log.e(TAG, e.toString());
    }

    mediaPlayer.reset();

    return duration;
}
 

/**
 * Opens a stream to the given URI.
 * @return Never returns null.
 * @throws Throws an InvalidArgumentException for relative URIs. Relative URIs should be
 *     resolved before being passed into this function.
 * @throws Throws an IOException if the URI cannot be opened.
 */
public OutputStream openOutputStream(Uri uri, boolean append) throws IOException {
    assertBackgroundThread();
    switch (getUriType(uri)) {
        case URI_TYPE_FILE: {
            File localFile = new File(uri.getPath());
            File parent = localFile.getParentFile();
            if (parent != null) {
                parent.mkdirs();
            }
            return new FileOutputStream(localFile, append);
        }
        case URI_TYPE_CONTENT:
        case URI_TYPE_RESOURCE: {
            AssetFileDescriptor assetFd = contentResolver.openAssetFileDescriptor(uri, append ? "wa" : "w");
            return assetFd.createOutputStream();
        }
    }
    throw new FileNotFoundException("URI not supported by CordovaResourceApi: " + uri);
}
 

private void initMediaPlayer(SurfaceHolder holder){
    mediaPlayer = new MediaPlayer();
    try {
        AssetManager assetMg = getApplicationContext().getAssets();
        AssetFileDescriptor fileDescriptor = assetMg.openFd(此处资源asset请从鸿洋大神那获取);
        mediaPlayer.setDataSource(fileDescriptor.getFileDescriptor(),
                fileDescriptor.getStartOffset(), fileDescriptor.getLength());
        mediaPlayer.setDisplay(holder);
        mediaPlayer.prepare();
        mediaPlayer.setLooping(true);
        mediaPlayer.setVolume(0, 0);
        mediaPlayer.prepare();
    }catch (Exception e){
        e.printStackTrace();
    }

}
 

private static MediaPlayer buildMediaPlayer(Context activity) {
  MediaPlayer mediaPlayer = new MediaPlayer();
  mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
  // When the beep has finished playing, rewind to queue up another one.
  mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer player) {
      player.seekTo(0);
    }
  });

  AssetFileDescriptor file = activity.getResources().openRawResourceFd(fakeR.getId("raw", "beep"));
  try {
    mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
    file.close();
    mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
    mediaPlayer.prepare();
  } catch (IOException ioe) {
    Log.w(TAG, ioe);
    mediaPlayer = null;
  }
  return mediaPlayer;
}
 

protected AssetFileDescriptor openVideoThumbnailCleared(long id, CancellationSignal signal)
        throws FileNotFoundException {
    final ContentResolver resolver = getContext().getContentResolver();
    Cursor cursor = null;
    try {
        cursor = resolver.query(Video.Thumbnails.EXTERNAL_CONTENT_URI,
                VideoThumbnailQuery.PROJECTION, Video.Thumbnails.VIDEO_ID + "=" + id, null,
                null);
        if (cursor.moveToFirst()) {
            final String data = cursor.getString(VideoThumbnailQuery._DATA);
            return new AssetFileDescriptor(ParcelFileDescriptor.open(
                    new File(data), ParcelFileDescriptor.MODE_READ_ONLY), 0,
                    AssetFileDescriptor.UNKNOWN_LENGTH);
        }
    } finally {
        IoUtils.closeQuietly(cursor);
    }
    return null;
}
 

private void startPlaying(SurfaceTexture surfaceTexture)
{
    renderer = new VideoTextureRenderer(surfaceTexture, surfaceWidth, surfaceHeight, videoTexture -> {
        // This runs on background thread as well.
        player = new MediaPlayer();
        try
        {
            AssetFileDescriptor afd = getAssets().openFd("big_buck_bunny.mp4");
            player.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
            player.setSurface(new Surface(videoTexture));
            player.setLooping(true);
            player.prepare();
            renderer.setVideoSize(player.getVideoWidth(), player.getVideoHeight());
            player.start();

        }
        catch (IOException e)
        {
            throw new RuntimeException("Could not open input video!");
        }
    });
}
 

/**
 * Makes a new sound pool, loads the requested sound and plays it once it's loaded
 * Could be made a LOT better by reusing the same pool and checking if it's already loaded
 *
 * @param file the sound to play
 */
public static void playSound(String file) {
    if (P.getBool("mute_sounds")) return;
    SoundPool pool = buildPool();
    try {
        AssetFileDescriptor fd = getContext().getAssets().openFd(file);
        pool.setOnLoadCompleteListener(new SoundPool.OnLoadCompleteListener() {
            @Override
            public void onLoadComplete(SoundPool soundPool, int i, int i1) {
                soundPool.play(i, 1, 1, 1, 0, 1);
            }
        });
        pool.load(fd, 1);
    } catch (Exception ignored) {
        //
    }
}
 

public Boolean processAndPlayFile(String fileName)
{
    try
    {
        setStatus(STATUS_STARTING_FILE);
        player = new OBAudioBufferPlayer(true);
        AssetFileDescriptor afd = OBAudioManager.audioManager.getAudioPathFD(fileName);
        if (afd == null)
        {
            allFilesDone = true;
            return false;
        }
        player.startPlaying(afd);
    }
    catch (Exception e)
    {
        allFilesDone = true;
        return false;
    }
    return true;
}
 

private MediaPlayer buildMediaPlayer(Context activity) {
    MediaPlayer mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mediaPlayer.setOnCompletionListener(this);
    mediaPlayer.setOnErrorListener(this);

    AssetFileDescriptor file = activity.getResources().openRawResourceFd(
            R.raw.beep);
    try {
        mediaPlayer.setDataSource(file.getFileDescriptor(),
                file.getStartOffset(), file.getLength());
        file.close();
        mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
        mediaPlayer.prepare();
    } catch (IOException ioe) {
        Log.w(TAG, ioe);
        mediaPlayer = null;
    }
    return mediaPlayer;
}
 

private boolean playMediaUrl(String mediaUrl) {
    getTvPlayer();
    Log.d(TAG, "Play " + mediaUrl);
    try {
        if (mediaUrl.startsWith("assets://")) {
            AssetFileDescriptor fileDescriptor = getAssets().openFd(mediaUrl.substring(9));
            mMockTvPlayer.playMediaFromAssets(fileDescriptor);
        } else {
            mMockTvPlayer.playMedia(mediaUrl);
        }
    } catch (IOException e) {
        e.printStackTrace();
        notifyVideoUnavailable(TvInputManager.VIDEO_UNAVAILABLE_REASON_UNKNOWN);
        return false;
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        notifyTimeShiftStatusChanged(TvInputManager.TIME_SHIFT_STATUS_AVAILABLE);
    }
    notifyVideoAvailable();
    return true;
}
 

@Override
public void cancel() {
    synchronized (recognizerLock) {
        if (isRecording) {
            audioRecord.stop();
            isRecording = false;

            final AssetFileDescriptor cancelSound = config.getRecognizerCancelSound();
            if (cancelSound != null) {
                playSound(cancelSound);
            }
        }
        if (recognizeTask != null) {
            recognizeTask.cancel(true);
        }
        onListeningCancelled();
    }
}
 

public static FileInfo getContactAsVCardFile(Context context, Uri uri) {
    AssetFileDescriptor fd;
    try {
        fd = context.getContentResolver().openAssetFileDescriptor(uri, "r");
        java.io.FileInputStream in = fd.createInputStream();
        byte[] buf = new byte[(int) fd.getDeclaredLength()];
        in.read(buf);
        in.close();
        String vCardText = new String(buf);
        Log.d("Vcard", vCardText);
        List<String> pathSegments = uri.getPathSegments();
        String targetPath = "/" + pathSegments.get(pathSegments.size() - 1) + ".vcf";
        SecureMediaStore.copyToVfs(buf, targetPath);
        FileInfo info = new FileInfo();
        info.stream = new info.guardianproject.iocipher.FileInputStream(SecureMediaStore.vfsUri(targetPath).getPath());
        info.type = "text/vcard";
        return info;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}
 

public static SoundFile create(long audioId, String dataColumn,
                               ProgressListener progressListener)
    throws java.io.FileNotFoundException,
           java.io.IOException, InvalidInputException {

    Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, String.valueOf(audioId));
    AssetFileDescriptor file;

    // will throw FileNotFoundException if file does not exist
    file = App.getInstance().getContentResolver().openAssetFileDescriptor(uri, "r");

    String name = dataColumn.toLowerCase();
    String[] components = name.split("\\.");
    if (components.length < 2) {
        return null;
    }
    if (!Arrays.asList(getSupportedExtensions()).contains(components[components.length - 1])) {
        return null;
    }
    SoundFile soundFile = new SoundFile();
    soundFile.setProgressListener(progressListener);
    soundFile.ParseFile(uri, file, dataColumn);
    return soundFile;
}
 

/**
 * create mediaplayer for music
 * 
 * @param pPath
 *            the pPath relative to assets
 * @return
 */
private MediaPlayer createMediaplayer(final String pPath) {
	MediaPlayer mediaPlayer = new MediaPlayer();

	try {
		if (pPath.startsWith("/")) {
			final FileInputStream fis = new FileInputStream(pPath);
			mediaPlayer.setDataSource(fis.getFD());
			fis.close();
		} else {
			final AssetFileDescriptor assetFileDescritor = this.mContext.getAssets().openFd(pPath);
			mediaPlayer.setDataSource(assetFileDescritor.getFileDescriptor(), assetFileDescritor.getStartOffset(), assetFileDescritor.getLength());
		}

		mediaPlayer.prepare();

		mediaPlayer.setVolume(this.mLeftVolume, this.mRightVolume);
	} catch (final Exception e) {
		mediaPlayer = null;
		Log.e(Cocos2dxMusic.TAG, "error: " + e.getMessage(), e);
	}

	return mediaPlayer;
}
 

public void loadVideoPlayer()
{
    OBControl videoBox = objectDict.get("video_box");
    String videoFilePath = getLocalPath(String.format("%s.mp4",videoName));
    videoPlayer = new OBVideoPlayer(videoBox.frame(), this, false, false);
    AssetFileDescriptor afd = OBUtils.getAssetFileDescriptorForPath(videoFilePath);
    videoPlayer.prepareForPlaying(afd,0,null);
    videoPlayer.playAfterPrepare = false;
    videoPlayer.stopOnCompletion = false;
    videoBox.hide();
    videoPlayer.hide();
    attachControl(videoPlayer);
    OBPath path = (OBPath)objectDict.get("video_frame");
    path.sizeToBoundingBoxIncludingStroke();
    path.setZPosition(9);
    videoPlayer.setZPosition(10);
}
 

/**
 * Opens a stream to the given URI.
 * @return Never returns null.
 * @throws Throws an InvalidArgumentException for relative URIs. Relative URIs should be
 *     resolved before being passed into this function.
 * @throws Throws an IOException if the URI cannot be opened.
 */
public OutputStream openOutputStream(Uri uri, boolean append) throws IOException {
    assertBackgroundThread();
    switch (getUriType(uri)) {
        case URI_TYPE_FILE: {
            File localFile = new File(uri.getPath());
            File parent = localFile.getParentFile();
            if (parent != null) {
                parent.mkdirs();
            }
            return new FileOutputStream(localFile, append);
        }
        case URI_TYPE_CONTENT:
        case URI_TYPE_RESOURCE: {
            AssetFileDescriptor assetFd = contentResolver.openAssetFileDescriptor(uri, append ? "wa" : "w");
            return assetFd.createOutputStream();
        }
    }
    throw new FileNotFoundException("URI not supported by CordovaResourceApi: " + uri);
}
 

/**
 * Opens a stream to the given URI.
 * @return Never returns null.
 * @throws Throws an InvalidArgumentException for relative URIs. Relative URIs should be
 *     resolved before being passed into this function.
 * @throws Throws an IOException if the URI cannot be opened.
 */
public OutputStream openOutputStream(Uri uri, boolean append) throws IOException {
    assertBackgroundThread();
    switch (getUriType(uri)) {
        case URI_TYPE_FILE: {
            File localFile = new File(uri.getPath());
            File parent = localFile.getParentFile();
            if (parent != null) {
                parent.mkdirs();
            }
            return new FileOutputStream(localFile, append);
        }
        case URI_TYPE_CONTENT:
        case URI_TYPE_RESOURCE: {
            AssetFileDescriptor assetFd = contentResolver.openAssetFileDescriptor(uri, append ? "wa" : "w");
            return assetFd.createOutputStream();
        }
    }
    throw new FileNotFoundException("URI not supported by CordovaResourceApi: " + uri);
}
 

/**
 * Opens a stream to the given URI.
 * @return Never returns null.
 * @throws Throws an InvalidArgumentException for relative URIs. Relative URIs should be
 *     resolved before being passed into this function.
 * @throws Throws an IOException if the URI cannot be opened.
 */
public OutputStream openOutputStream(Uri uri, boolean append) throws IOException {
    assertBackgroundThread();
    switch (getUriType(uri)) {
        case URI_TYPE_FILE: {
            File localFile = new File(uri.getPath());
            File parent = localFile.getParentFile();
            if (parent != null) {
                parent.mkdirs();
            }
            return new FileOutputStream(localFile, append);
        }
        case URI_TYPE_CONTENT:
        case URI_TYPE_RESOURCE: {
            AssetFileDescriptor assetFd = contentResolver.openAssetFileDescriptor(uri, append ? "wa" : "w");
            return assetFd.createOutputStream();
        }
    }
    throw new FileNotFoundException("URI not supported by CordovaResourceApi: " + uri);
}
 

/**
 * Opens a stream to the given URI.
 * @return Never returns null.
 * @throws Throws an InvalidArgumentException for relative URIs. Relative URIs should be
 *     resolved before being passed into this function.
 * @throws Throws an IOException if the URI cannot be opened.
 */
public OutputStream openOutputStream(Uri uri, boolean append) throws IOException {
    assertBackgroundThread();
    switch (getUriType(uri)) {
        case URI_TYPE_FILE: {
            File localFile = new File(uri.getPath());
            File parent = localFile.getParentFile();
            if (parent != null) {
                parent.mkdirs();
            }
            return new FileOutputStream(localFile, append);
        }
        case URI_TYPE_CONTENT:
        case URI_TYPE_RESOURCE: {
            AssetFileDescriptor assetFd = contentResolver.openAssetFileDescriptor(uri, append ? "wa" : "w");
            return assetFd.createOutputStream();
        }
    }
    throw new FileNotFoundException("URI not supported by CordovaResourceApi: " + uri);
}
 

public void startPlaying (String fileName, String channel)
{
    OBGeneralAudioPlayer player = playerForChannel(channel);
    if (fileName == null)
        player.stopPlaying();
    else
    {
        AssetFileDescriptor fd = getAudioPathFD(fileName);
        if (fd != null)
        {
            player.startPlaying(fd);
        }
        else
        {
            MainActivity.log("Error caught in OBAudioManager.startPlaying [" + fileName + "] returned a null file descriptor");
        }
    }
}
 

private MediaPlayer buildMediaPlayer(Context activity) {
    MediaPlayer mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
    mediaPlayer.setOnCompletionListener(this);
    mediaPlayer.setOnErrorListener(this);
    try {
        AssetFileDescriptor file = activity.getResources().openRawResourceFd(R.raw.beep);
        try {
            mediaPlayer.setDataSource(file.getFileDescriptor(), file.getStartOffset(), file.getLength());
        } finally {
            file.close();
        }
        mediaPlayer.setVolume(BEEP_VOLUME, BEEP_VOLUME);
        mediaPlayer.prepare();
        return mediaPlayer;
    } catch (IOException ioe) {
        Log.w(TAG, ioe);
        mediaPlayer.release();
        return null;
    }
}
 

private static boolean isFileExistsApi29(String filePath) {
    if (Build.VERSION.SDK_INT >= 29) {
        try {
            Uri uri = Uri.parse(filePath);
            ContentResolver cr = Utils.getApp().getContentResolver();
            AssetFileDescriptor afd = cr.openAssetFileDescriptor(uri, "r");
            if (afd == null) return false;
            try {
                afd.close();
            } catch (IOException ignore) {
            }
        } catch (FileNotFoundException e) {
            return false;
        }
        return true;
    }
    return false;
}
 

/**
 * Check whether a content URI exists.
 *
 * @param uriString the content URI to query.
 * @return true if the URI exists, or false otherwise.
 */
@CalledByNative
public static boolean contentUriExists(String uriString) {
    AssetFileDescriptor asf = null;
    try {
        asf = getAssetFileDescriptor(uriString);
        return asf != null;
    } finally {
        // Do not use StreamUtil.closeQuietly here, as AssetFileDescriptor
        // does not implement Closeable until KitKat.
        if (asf != null) {
            try {
                asf.close();
            } catch (IOException e) {
                // Closing quietly.
            }
        }
    }
}
 

public void changeBGM(final int newBGM, final int... pos) {
    BGMFader.stop(bgm, 400, new Runnable() {
        @Override
        public void run() {
            bgm.reset();

            bgmId = newBGM;
            AssetFileDescriptor afd = GameActivity.getInstance().getResources().
                    openRawResourceFd(bgmId);
            if (afd == null) return;

            try {
                bgm.setDataSource(
                        afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
                afd.close();
                bgm.prepare();
            } catch (IOException | IllegalStateException e) {
                e.printStackTrace();
            }

            bgm.setLooping(true);
            if (pos.length > 0) { bgm.seekTo(pos[0]); }
        }
    });
}
 

public void playJingle(int jingleId) {
    jingle.reset();

    bgm.setVolume(0, 0);

    AssetFileDescriptor afd = GameActivity.getInstance().getResources().
            openRawResourceFd(jingleId);
    if (afd == null) return;

    try {
        jingle.setDataSource(afd.getFileDescriptor(), afd.getStartOffset(), afd.getLength());
        afd.close();
        jingle.prepare();
    } catch (IOException e) {
        e.printStackTrace();
    }
    jingle.start();

    jingle.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            bgm.setVolume(1, 1);
        }
    });
}
 

/**
 * Creates drawable from AssetFileDescriptor.
 * Convenience wrapper for {@link GifDrawable#GifDrawable(FileDescriptor)}
 *
 * @param afd source
 * @throws NullPointerException if afd is null
 * @throws IOException          when opening failed
 */
public GifDrawable(AssetFileDescriptor afd) throws IOException {
    if (afd == null)
        throw new NullPointerException("Source is null");
    FileDescriptor fd = afd.getFileDescriptor();
    try {
        mGifInfoPtr = openFd(mMetaData, fd, afd.getStartOffset(), false);
    } catch (IOException ex) {
        afd.close();
        throw ex;
    }
    mColors = new int[mMetaData[0] * mMetaData[1]];
    mInputSourceLength = afd.getLength();
}
 

public OpenForReadResult(Uri uri, InputStream inputStream, String mimeType, long length, AssetFileDescriptor assetFd) {
    this.uri = uri;
    this.inputStream = inputStream;
    this.mimeType = mimeType;
    this.length = length;
    this.assetFd = assetFd;
}