我在三星和谷歌最新版本手机上面临android媒体播放器错误（-38,0）

我们将使用带有以下更改的。和我们在项目中使用的一样，我们在三星旗舰设备和谷歌设备的媒体播放器错误监听器上发现了一个错误（-38,0）。（在注释8-8.1和像素2xl-9.0中测试）

在这里，

onError

listener首先调用

onPrepared

listener

预期解决方案：播放音频时无任何错误

package com.example.android.mediaplayersample;

import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.media.AudioManager;
import android.media.MediaPlayer;

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

/**
 * Exposes the functionality of the {@link MediaPlayer} and implements the {@link PlayerAdapter}
 * so that {@link MainActivity} can control music playback.
 */
public final class MediaPlayerHolder implements PlayerAdapter {

    public static final int PLAYBACK_POSITION_REFRESH_INTERVAL_MS = 1000;

    private final Context mContext;
    private MediaPlayer mMediaPlayer;
    private int mResourceId;
    private PlaybackInfoListener mPlaybackInfoListener;
    private ScheduledExecutorService mExecutor;
    private Runnable mSeekbarPositionUpdateTask;

    public MediaPlayerHolder(Context context) {
        mContext = context.getApplicationContext();
    }

    /**
     * Once the {@link MediaPlayer} is released, it can't be used again, and another one has to be
     * created. In the onStop() method of the {@link MainActivity} the {@link MediaPlayer} is
     * released. Then in the onStart() of the {@link MainActivity} a new {@link MediaPlayer}
     * object has to be created. That's why this method is private, and called by load(int) and
     * not the constructor.
     */
    private void initializeMediaPlayer() {
        if (mMediaPlayer != null) {

            mMediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mediaPlayer) {
                    logToUI("OnPrepared()");
                    mediaPlayer.start();
                }
            });
            mMediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
                @Override
                public void onCompletion(MediaPlayer mediaPlayer) {
                    stopUpdatingCallbackWithPosition(true);
                    logToUI("MediaPlayer playback completed");
                    if (mPlaybackInfoListener != null) {
                        mPlaybackInfoListener.onStateChanged(PlaybackInfoListener.State.COMPLETED);
                        mPlaybackInfoListener.onPlaybackCompleted();
                    }
                }
            });
            mMediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
                @Override
                public boolean onError(MediaPlayer mediaPlayer, int i, int i1) {
                    logToUI("OnError()" + i + " " + i1);
                    return true;
                }
            });
            logToUI("mMediaPlayer = new MediaPlayer()");
        }
    }

    public void setPlaybackInfoListener(PlaybackInfoListener listener) {
        mPlaybackInfoListener = listener;
    }

    // Implements PlaybackControl.
    @Override
    public void loadMedia(int resourceId) {
        mResourceId = resourceId;
        mMediaPlayer = new MediaPlayer();

        try {
            logToUI("load() {1. setDataSource}");
            mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mMediaPlayer.setDataSource("http://radio-electron.ru:8000/96");
        } catch (Exception e) {
            logToUI(e.toString());
        }

        initializeMediaPlayer();


        try {
            logToUI("load() {2. prepare}");
            mMediaPlayer.prepareAsync();
        } catch (Exception e) {
            logToUI(e.toString());
        }

        initializeProgressCallback();
        logToUI("initializeProgressCallback()");
    }

    @Override
    public void release() {
        if (mMediaPlayer != null) {
            logToUI("release() and mMediaPlayer = null");
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    @Override
    public boolean isPlaying() {
        if (mMediaPlayer != null) {
            return mMediaPlayer.isPlaying();
        }
        return false;
    }

    @Override
    public void play() {
        if (mMediaPlayer != null && !mMediaPlayer.isPlaying()) {
            logToUI(String.format("playbackStart() %s",
                    mContext.getResources().getResourceEntryName(mResourceId)));
            mMediaPlayer.start();
            if (mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onStateChanged(PlaybackInfoListener.State.PLAYING);
            }
            startUpdatingCallbackWithPosition();
        }
    }

    @Override
    public void reset() {
        if (mMediaPlayer != null) {
            logToUI("playbackReset()");
            mMediaPlayer.reset();
            loadMedia(mResourceId);
            if (mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onStateChanged(PlaybackInfoListener.State.RESET);
            }
            stopUpdatingCallbackWithPosition(true);
        }
    }

    @Override
    public void pause() {
        if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
            if (mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onStateChanged(PlaybackInfoListener.State.PAUSED);
            }
            logToUI("playbackPause()");
        }
    }

    @Override
    public void seekTo(int position) {
        if (mMediaPlayer != null) {
            logToUI(String.format("seekTo() %d ms", position));
            mMediaPlayer.seekTo(position);
        }
    }

    /**
     * Syncs the mMediaPlayer position with mPlaybackProgressCallback via recurring task.
     */
    private void startUpdatingCallbackWithPosition() {
        if (mExecutor == null) {
            mExecutor = Executors.newSingleThreadScheduledExecutor();
        }
        if (mSeekbarPositionUpdateTask == null) {
            mSeekbarPositionUpdateTask = new Runnable() {
                @Override
                public void run() {
                    updateProgressCallbackTask();
                }
            };
        }
        mExecutor.scheduleAtFixedRate(
                mSeekbarPositionUpdateTask,
                0,
                PLAYBACK_POSITION_REFRESH_INTERVAL_MS,
                TimeUnit.MILLISECONDS
        );
    }

    // Reports media playback position to mPlaybackProgressCallback.
    private void stopUpdatingCallbackWithPosition(boolean resetUIPlaybackPosition) {
        if (mExecutor != null) {
            mExecutor.shutdownNow();
            mExecutor = null;
            mSeekbarPositionUpdateTask = null;
            if (resetUIPlaybackPosition && mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onPositionChanged(0);
            }
        }
    }

    private void updateProgressCallbackTask() {
        if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
            int currentPosition = mMediaPlayer.getCurrentPosition();
            if (mPlaybackInfoListener != null) {
                mPlaybackInfoListener.onPositionChanged(currentPosition);
            }
        }
    }

    @Override
    public void initializeProgressCallback() {
        final int duration = mMediaPlayer.getDuration();
        if (mPlaybackInfoListener != null) {
            mPlaybackInfoListener.onDurationChanged(duration);
            mPlaybackInfoListener.onPositionChanged(0);
            logToUI(String.format("firing setPlaybackDuration(%d sec)",
                    TimeUnit.MILLISECONDS.toSeconds(duration)));
            logToUI("firing setPlaybackPosition(0)");
        }
    }

    private void logToUI(String message) {
        if (mPlaybackInfoListener != null) {
            mPlaybackInfoListener.onLogUpdated(message);
        }
    }

}

---

我们在

onBufferingUpdate（）

中使用

getDuration（）

，这会产生问题，因此现在我们在

onPrepared（）

中初始化

onBufferingUpdate（）

侦听器，并在尝试播放下一个音频时删除侦听器。

我们在

onBufferingUpdate（）中使用
getDuration（）

&这会产生问题，因此现在我们正在初始化

onPrepared（）

中的

onBufferingUpdate（）

侦听器，尝试播放下一个音频时请删除侦听器