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目前我正在使用Android音板,到目前为止它没有问题。我用图像等做了一个漂亮的listView,但我无法正确加载声音。 soundfiles的位置存储在arraylist中,我试图用getById()加载它们。MediaPlayer,onItemClickListener和NullPointerException。怎么了?
这里是我做了什么
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
mp = MediaPlayer.create(MainActivity.this, Uri.parse("android.resource://" + getPackageName() + "/" +
Model.GetbyId(position + 1).Sound));
if(mp == null) {
Toast.makeText(getApplicationContext(),
"Mediaplayer is null. Link was: "+link , Toast.LENGTH_LONG)
.show();
} else {
mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mediaplayer) {
mediaplayer.stop();
mediaplayer.release();
}
});
mp.start();
}
}
});
谁能告诉我,为什么它不工作?我仍然是初学者,经过数小时的努力和研究后,我无法想象它。
编辑:这是logcat中的错误。我敢肯定的文件是存在的......
07-28 12:56:53.998 124-593/? I/AwesomePlayer: setDataSource_l(URL suppressed)
07-28 12:56:53.998 124-7235/? E/: Failed to open file 'R.raw.so_schoenasummervielheu'. (No such file or directory)
07-28 12:56:53.998 6760-6771/? E/MediaPlayer: error (1, -2147483648)
07-28 12:56:54.008 6760-6760/? D/MediaPlayer: create failed:
java.io.IOException: Prepare failed.: status=0x1
at android.media.MediaPlayer.prepare(Native Method)
at android.media.MediaPlayer.create(MediaPlayer.java:792)
at android.media.MediaPlayer.create(MediaPlayer.java:769)
at com.spruechmeischtr2000.android.MainActivity$1.onItemClick(MainActivity.java:45)
at android.widget.AdapterView.performItemClick(AdapterView.java:298)
at android.widget.AbsListView.performItemClick(AbsListView.java:1100)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:2788)
at android.widget.AbsListView$1.run(AbsListView.java:3463)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
编辑:只是想在这里回答我的问题(StackOverflow上不会让我的三个小时,这样做)。其实代码是好的,我做错了一件事是我声明我的声音文件作为字符串变量,而不是我的ArrayList/Itemadapter int资源ID。感谢所有试图帮助我的人:)
你可以发布logcat吗? – Shark
对于声卡应用程序,您可能也会考虑使用'SoundPool'而不是'MediaPlayer',它可能更合适:http://developer.android.com/reference/android/media/SoundPool.html –
Sure , 1秒。 –