我试图制作一个简单的音频播放器。当我在没有服务的主活动中创建它时,它正常工作,音乐正在播放(如果我按下电源按钮关闭屏幕就可以工作)并且在打开屏幕后仍然可以正常工作。但如果我使用服务在后台播放音乐,当我按下电源按钮打开屏幕时,我的应用程序会关闭。
public class MainActivity extends AppCompatActivity {
static ArrayList<HashMap<String, Object>> listSongs = new ArrayList<>();
Intent intent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listSongs = getAllMusicInfo();
intent = new Intent(this, BackgroundPlayer.class);
Button buttonStart = (Button) findViewById(R.id.startService);
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startService(intent);
Toast.makeText(MainActivity.this, "It's started", Toast.LENGTH_SHORT).show();
}
});
Button buttonStop = (Button) findViewById(R.id.StopService);
buttonStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
stopService(intent);
Toast.makeText(MainActivity.this, "It's stopped", Toast.LENGTH_SHORT).show();
}
});
}
public class BackgroundPlayer extends Service implements MediaPlayer.OnCompletionListener {
MediaPlayer player;
@Override
public void onCreate() {
super.onCreate();
player = new MediaPlayer();
try {
player.setDataSource((String) MainActivity.listSongs.get(0).get("path"));
player.prepare();
} catch (IOException e) {
e.printStackTrace();
}
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
player.start();
return START_STICKY;
}
@Override
public void onCompletion(MediaPlayer mp) {}
}
06-05 09:58:54.206 31873-31873/com.vitaliylevashov.serviceplayer V/MediaPlayer: start
06-05 09:58:54.206 31873-31885 / com.vitaliylevashov.serviceplayer V / MediaPlayer:收到的消息msg = 6,ext1 = 0,ext2 = 0 06-05 09:58:54.206 31873-31885 / com.vitaliylevashov.serviceplayer V / MediaPlayer:收到MEDIA_STARTED 06-05 09:58:54.206 31873-31885 / com.vitaliylevashov.serviceplayer V / MediaPlayer:回调应用程序 06-05 09:58:54.206 31873-31885 / com.vitaliylevashov.serviceplayer V / MediaPlayer:回调回来 06-05 09:58:54.236 31873-31873 / com.vitaliylevashov.serviceplayer I / MediaPlayer:不要发送意图。 msg.arg1 = 0,msg.arg2 = 0 06-05 09:58:54.236 31873-31873 / com.vitaliylevashov.serviceplayer E / MediaPlayer:应该已经设置了字幕控制器 06-05 09:58:54.256 31873-31873 / com.vitaliylevashov.serviceplayer V / MediaPlayer-JNI:getCurrentPosition:192(msec) 06-05 09:58:54.256 31873-31873 / com.vitaliylevashov.serviceplayer V / MediaPlayer-JNI:isPlaying:1 &LT;&LT; 06-05 09:59:25.526 31873-31873 / com.vitaliylevashov.serviceplayer D / AndroidRuntime:关闭VM 06-05 09:59:25.526 31873-31873 / com.vitaliylevashov.serviceplayer W / dalvikvm:threadid = 1:线程退出时未捕获异常(group = 0x41660bc0) 06-05 09:59:25.526 31873-31873 / com.vitaliylevashov.serviceplayer E / AndroidRuntime:FATAL EXCEPTION:main 过程:com.vitaliylevashov.serviceplayer,PID:31873 android.database.StaleDataException:在游标关闭后尝试访问它。 在android.database.BulkCursorToCursorAdaptor.throwIfCursorIsClosed(BulkCursorToCursorAdaptor.java:64) 在android.database.BulkCursorToCursorAdaptor.requery(BulkCursorToCursorAdaptor.java:133) 在android.database.CursorWrapper.requery(CursorWrapper.java:186) 在android.app.Activity.performRestart(Activity.java:5346) 在android.app.ActivityThread.handleSleeping(ActivityThread.java:3487) 在android.app.ActivityThread.access $ 3000(ActivityThread.java:155) 在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1428) 在android.os.Handler.dispatchMessage(Handler.java:102) 在android.os.Looper.loop(Looper.java:136) 在android.app.ActivityThread.main(ActivityThread.java:5433) at java.lang.reflect.Method.invokeNative(Native Method) 在java.lang.reflect.Method.invoke(Method.java:515) 在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1268) 在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1084) 在dalvik.system.NativeStart.main(本地方法)
答案 0 :(得分:0)
在Manifest中添加一个服务标签,可能你没有在manifest中添加它
<service android:name=".MyService" />
请求发布错误日志/ logcat