Android 媒体播放器:在状态 4 错误(-38,0)中调用开始 [英] Android Media Player: Start called in state 4 error(-38,0)

问题描述

这是我用来从其他类动态获取文件名 (.mp3) 的代码，因为我的资产文件夹中有许多 mp3 文件:

This is the code am using to fetch a file name(.mp3) dynamically from some other class as am having many mp3 files in my assets folder:

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();
                    }
                }




            }
        });


    }

日志猫:

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)

注意事项:1. 我检查了堆栈溢出的类似线程，答案是使用 prepareAsync()2.我用过prepareAsync()

Points to be noted: 1. I have checked similar threads on stack overflow the answer is using prepareAsync() 2. I have used prepareAsync()

提前致谢.

推荐答案

你也可以使用下面的 onPrepared() 方法来调用 start 方法，使得 start() 是在 MediaPlayer 准备好后调用.

You can also use below onPrepared() method to call start method so that start() is called after MediaPlayer is prepared.

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

            mp.start();

        }
    });

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