Question

当我尝试setNextMediaPlayer它会抛出下一个玩家不能自我，我不明白它是什么。提前谢谢。

@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    private void createNextMediaPlayer(int resource) {

        Uri url = Uri.parse("android.resource://" + mService.getPackageName() + "/" + resource);
        mNextPlayer = new MediaPlayer();
        mNextPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        try {
            mNextPlayer.setDataSource(mService, url);
        } catch (IOException e) {
            e.printStackTrace();
        }
        mNextPlayer.prepareAsync();
        mNextPlayer.setWakeMode(mService.getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
        mNextPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                if (mCurrentPlayer != null)
                    mCurrentPlayer.setNextMediaPlayer(mp); //ERROR
            }
        });
        if (mCurrentPlayer != null)
            mCurrentPlayer.setOnCompletionListener(onCompletionListener);
        mOnCompleteResId = resource;
    }

07-29 20：35：46.543 14771-14771 / com.supermedaiplayer E / AndroidRuntime：致命异议：主要处理：com.supermedaiplayer，PID：14771 java.lang.IllegalArgumentException：下一个玩家不能自我在android.media.MediaPlayer.setNextMediaPlayer（原生方法） at god.mediaplayers.LocalPlayer $ 2.onPrepared（LocalPlayer.java:410）在 android.media.MediaPlayer $ EventHandler.handleMessage（MediaPlayer.java:2871）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:154）在android.app.ActivityThread.main（ActivityThread.java:6123） at java.lang.reflect.Method.invoke（Native Method）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:867）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:757）

Answer 1

谢谢，我自己发现了这个错误，希望我的回答可能是一个。

我将从mp获得的onPrepare(Mediaplayer mp)传递给mCurrentPlayer.setNextMediaPlayer(mp);，其中有些情况与导致问题的mCurrentPlayer相同。

根据documentation“下一个MediaPlayer必须与'this'不同。如果next == this，将抛出异常。”所以我将mNextPlayer传递给mCurrentPlayer.setNextMediaPlayer(mNextPlayer);，这就是诀窍。

我使用修复程序更新了代码：

private void createNextMediaPlayer(int resource) {

        Uri url = Uri.parse("android.resource://" + mService.getPackageName() + "/" + resource);
        mNextPlayer = new MediaPlayer();
        mNextPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
        try {
            mNextPlayer.setDataSource(mService, url);
        } catch (IOException e) {
            e.printStackTrace();
        }
        mNextPlayer.prepareAsync();
        mNextPlayer.setWakeMode(mService.getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
        mNextPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(MediaPlayer mp) {
                if (mCurrentPlayer != null) {
                    LogHelper.d(TAG, "Checking reference for mp", mCurrentPlayer, " ", mp);
                    LogHelper.d(TAG, "Checking reference for mNextPlayer ", mCurrentPlayer, " ", mNextPlayer);
                    mCurrentPlayer.setNextMediaPlayer(mNextPlayer);
                }
            }
        });
        if (mCurrentPlayer != null)
            mCurrentPlayer.setOnCompletionListener(onCompletionListener);
        mOnCompleteResId = resource;
    }

更新：

在我的情况下，它发生在Prepared被多次调用。在某些时候，mNextPlayer没有准备好，所以它再次崩溃，消息mNextPlayer没有准备好所以我调整了代码以符合我的要求。

代码：

            @Override
            public void onPrepared(MediaPlayer mp) {
                if (mCurrentPlayer != null && mp != mCurrentPlayer) {
                    mCurrentPlayer.setNextMediaPlayer(mp);
                }
            }

setNextMediaPlayer抛出下一个玩家不能自我

1 个答案: