Android Media Player:开始调用状态4错误(-38,0)

时间:2013-03-20 06:07:23

标签: android android-asynctask media-player android-assets

这是用于从其他类动态获取文件名(.mp3)的代码,因为我的assets文件夹中有很多mp3文件:

playAudioButton.setOnClickListener(new OnClickListener() {


            @Override
            public void onClick(View v) 
            {
                FileName audio=new FileName();
                String audioName=audio.getAudioName(count).toString();
                if(audioName=="NO Audio")
                {

                    Toast.makeText(getApplicationContext(), "No Audio for this page", Toast.LENGTH_SHORT).show();

                }
                else
                {

                    try {
                        afd=getAssets().openFd(audioName + ".mp3");
                        mp = new MediaPlayer();
                        mp.setDataSource(afd.getFileDescriptor(),afd.getStartOffset(),afd.getLength());
                        mp.prepareAsync();
                        mp.start();

                    } catch (IllegalArgumentException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IllegalStateException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }




            }
        });


    }

Log Cat:

03-20 11:21:28.726: E/SpannableStringBuilder(4418): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
03-20 11:21:28.726: E/SpannableStringBuilder(4418): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
03-20 11:22:24.968: D/libEGL(4579): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so
03-20 11:22:24.976: D/libEGL(4579): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so
03-20 11:22:24.984: D/libEGL(4579): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so
03-20 11:22:25.070: D/OpenGLRenderer(4579): Enabling debug mode 0
03-20 11:22:38.773: E/MediaPlayer(4579): start called in state 4
03-20 11:22:38.773: E/MediaPlayer(4579): error (-38, 0)
03-20 11:22:38.773: E/MediaPlayer(4579): Error (-38,0)

需要注意的要点: 1.我在堆栈溢出时检查了类似的线程,答案是使用prepareAsync() 2.我使用了prepareAsync()

提前致谢。

4 个答案:

答案 0 :(得分:20)

您还可以使用以下onPrepared()方法调用start方法,以便在start()准备好后调用MediaPlayer

mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            // TODO Auto-generated method stub

            mp.start();

        }
    });

答案 1 :(得分:2)

您可以将转换为URI的文件路径传递给preparedSync/prepare

,而不是使用MediaPlayer的{​​{1}}方法。
MediaPlayer.create()

这将准备并开始播放

或者另一种方法是使用MediaPlayer mediaPlayer = MediaPlayer.create(context, URI.parse("file://"+filePath)); 的{​​{1}}然后从准备开始播放

答案 2 :(得分:0)

状态4表示Mediaplayer正在准备状态

我们称其他行为如

Mediaplayer.start() 
Mediaplayer.stop() 
Mediaplayer.pause() 

或任何其他事情。

根据您的代码,Mediaplayer.start();

你需要编写onprepare方法

MediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            // TODO Auto-generated method stub
            mp.start();
        }
    });

一旦调用了Onprepared()方法,就可以进行进一步的处理

删除

mp.start() 

mp.prepareAsync();

你会很高兴

答案 3 :(得分:0)

public class BackgroundSound extends AsyncTask<String, Void, Void> {
    MediaPlayer mediaPlayerChatAudio;

    @Override
    protected Void doInBackground(String... params) {
        String model = params[0];
        final Uri uri = Uri.parse(model);
        LogEm.e("EM", "::::::::::URI::::::::::" + model);

        if (uri == null || uri == Uri.EMPTY) return null;
        if (mediaPlayerChatAudio != null) mediaPlayerChatAudio.stop();

        try {
            mediaPlayerChatAudio = MediaPlayer.create(TextActivity.this, uri);
            mediaPlayerChatAudio.setAudioStreamType(AudioManager.STREAM_MUSIC);
        } catch (Exception e) {
            // do nothing.
        }
        if (mediaPlayerChatAudio == null) return null;

        mediaPlayerChatAudio.setVolume(1.0f, 1.0f);
        mediaPlayerChatAudio.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                mediaPlayerChatAudio.reset();
                mediaPlayerChatAudio.release();
                mediaPlayerChatAudio = null;
            }
        });
        mediaPlayerChatAudio.start();
        return null;
    }
}