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我是 android 新手，需要在声音结束后播放声音和显示图像。

下面提到的代码告诉你，声音完成后显示下一个图像并播放与之相关的声音

代码：

mymediaplayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
                //mymediaplayer=null;
                //mymediaplayer.reset();
                mseekbar.setProgress(0);
                count++;
                Toast.makeText(getApplicationContext(), "SONG PLAYING OVER", 0).show();
                changeImage(count);
                playsound(count);

            }
        });

所以对于某些图像它可以，但是在某些图像之后它会抛出异常，说无法创建媒体播放器，然后强制关闭应用程序。

下面是 playsound 方法的代码。

private void playsound(int soundindex) {
        // TODO Auto-generated method stub
        if(mymediaplayer!=null)
            mymediaplayer.release();
        Toast.makeText(getApplicationContext(), "SOUND"+soundindex, 0).show();
        if(souncollect.getlengthofsoundfile_array()>=count)
        {
            try
            {
            mymediaplayer=MediaPlayer.create(MainActivity.this, souncollect.capture_sound.get(soundindex));


            mymediaplayer.seekTo(0);
            mymediaplayer.start();
            new Thread(this).start();
            }
            catch(Exception ex)
            {
                Toast.makeText(getApplicationContext(), "ERROR WHILE PLAYING SOUND", Toast.LENGTH_LONG).show();
            }
        }
        else
        {
            Toast.makeText(getApplicationContext(), "NO SOUND TO PLAY", Toast.LENGTH_SHORT).show();
        }

所有声音和图像的东西都在一些arraylist中的其他类上定义。在arraylist中我有18个声音和18个图像。

下面提到异常的日志文件

02-27 13:06:00.908: D/dalvikvm(1503): GC_EXTERNAL_ALLOC freed 87K, 52% free 2615K/5379K, external 2112K/2137K, paused 53ms
02-27 13:06:10.928: D/dalvikvm(1503): GC_EXTERNAL_ALLOC freed 23K, 52% free 2621K/5379K, external 2289K/2613K, paused 42ms
02-27 13:06:15.488: D/dalvikvm(1503): GC_EXTERNAL_ALLOC freed 14K, 52% free 2631K/5379K, external 7212K/8760K, paused 264ms
02-27 13:06:21.039: D/dalvikvm(1503): GC_EXTERNAL_ALLOC freed 10K, 52% free 2634K/5379K, external 7015K/8761K, paused 42ms
****02-27 13:06:27.098: E/MediaPlayer(1503): Unable to to create media player
02-27 13:06:27.098: D/MediaPlayer(1503): create failed:
02-27 13:06:27.098: D/MediaPlayer(1503): java.io.IOException: setDataSourceFD failed.: status=0x80000000****
02-27 13:06:27.098: D/MediaPlayer(1503):    at android.media.MediaPlayer.setDataSource(Native Method)
02-27 13:06:27.098: D/MediaPlayer(1503):    at android.media.MediaPlayer.create(MediaPlayer.java:666)
02-27 13:06:27.098: D/MediaPlayer(1503):    at com.goutam.imageandplaysound.MainActivity.playsound(MainActivity.java:85)
02-27 13:06:27.098: D/MediaPlayer(1503):    at com.goutam.imageandplaysound.MainActivity.access$3(MainActivity.java:76)
02-27 13:06:27.098: D/MediaPlayer(1503):    at com.goutam.imageandplaysound.MainActivity$1.onCompletion(MainActivity.java:117)
02-27 13:06:27.098: D/MediaPlayer(1503):    at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:1316)
02-27 13:06:27.098: D/MediaPlayer(1503):    at android.os.Handler.dispatchMessage(Handler.java:99)
02-27 13:06:27.098: D/MediaPlayer(1503):    at android.os.Looper.loop(Looper.java:123)
02-27 13:06:27.098: D/MediaPlayer(1503):    at android.app.ActivityThread.main(ActivityThread.java:3683)
02-27 13:06:27.098: D/MediaPlayer(1503):    at java.lang.reflect.Method.invokeNative(Native Method)
02-27 13:06:27.098: D/MediaPlayer(1503):    at java.lang.reflect.Method.invoke(Method.java:507)
02-27 13:06:27.098: D/MediaPlayer(1503):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-27 13:06:27.098: D/MediaPlayer(1503):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-27 13:06:27.098: D/MediaPlayer(1503):    at dalvik.system.NativeStart.main(Native Method)
02-27 13:06:27.218: D/AndroidRuntime(1503): Shutting down VM
02-27 13:06:27.218: W/dalvikvm(1503): threadid=1: thread exiting with uncaught exception (group=0x40015560)
02-27 13:06:27.228: E/AndroidRuntime(1503): FATAL EXCEPTION: main
02-27 13:06:27.228: E/AndroidRuntime(1503): java.lang.NullPointerException
02-27 13:06:27.228: E/AndroidRuntime(1503):     at com.goutam.imageandplaysound.MainActivity.playsound(MainActivity.java:106)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at com.goutam.imageandplaysound.MainActivity.access$3(MainActivity.java:76)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at com.goutam.imageandplaysound.MainActivity$1.onCompletion(MainActivity.java:117)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:1316)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at android.os.Looper.loop(Looper.java:123)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at android.app.ActivityThread.main(ActivityThread.java:3683)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at java.lang.reflect.Method.invokeNative(Native Method)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at java.lang.reflect.Method.invoke(Method.java:507)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-27 13:06:27.228: E/AndroidRuntime(1503):     at dalvik.system.NativeStart.main(Native Method)
02-27 13:11:27.292: I/Process(1503): Sending signal. PID: 1503 SIG: 9

正如你所看到的一些图像和声音它运行正常，但一段时间后它无法创建媒体播放器。所以很困惑，不知道如何实现媒体播放器来逐个播放声音。它在图像编号 7 后失败。

代码中也提到了onpause状态

@Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
        if(!mymediaplayer.isPlaying())
        {
            mymediaplayer=null;
            mymediaplayer.release();
        }
    }

所以请建议什么是更好的方式。感谢您的回复

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