我正在制作一个Android应用程序。我正在创建一个在用户检查checkbox时始终在后台运行的服务，并且当用户unckeck时它应该停止。因此，当我选中此框并且它还显示“服务开始”Toast时，它确实有效，但当我uncheck checkbox时，它会显示Toast，其中显示“服务已停止”但它并未停止播放服务启动时启动的声音。阻止这种声音的唯一方法是关闭我的手机，然后打开它。
这是我启动和停止服务的java代码
public int onStartCommand(Intent intent, int flags, int startId) {
Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();
this.registerReceiver(this.batteryInfoReceiver, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
return START_STICKY;
}
public void onDestroy() {
super.onDestroy();
Toast.makeText(this, "Service Stopped", Toast.LENGTH_LONG).show();
}
这是我的xml文件
<CheckBoxPreference
android:title="Enable/Disable Alarm"
android:defaultValue="true"
android:key="cbAlarm"
android:summary="Enable or disable alarm" />
这是我的logcat
05-06 09:13:53.230: D/dalvikvm(5351): GC_EXTERNAL_ALLOC freed 39K, 50% free 2725K/5379K, external 0K/0K, paused 124ms
05-06 09:13:53.355: D/dalvikvm(5351): GC_EXTERNAL_ALLOC freed 21K, 49% free 2779K/5379K, external 504K/518K, paused 18ms
05-06 09:13:53.420: D/CLIPBOARD(5351): Hide Clipboard dialog at Starting input: finished by someone else... !
05-06 09:13:57.975: I/MediaPlayer(5351): uri is:content://media/internal/audio/media/44
05-06 09:13:57.975: I/MediaPlayer(5351): inside getAudioFilePath: content://media/internal/audio/media/44
05-06 09:13:57.980: I/MediaPlayer(5351): The actual path is:/system/media/audio/ringtones/S_A_cricket_chirps.ogg
05-06 09:13:57.980: I/MediaPlayer(5351): path is: /system/media/audio/ringtones/S_A_cricket_chirps.ogg
05-06 09:13:57.980: I/MediaPlayer(5351): file path found for DRM file:path is: /system/media/audio/ringtones/S_A_cricket_chirps.ogg
05-06 09:13:57.980: E/MediaPlayer-JNI(5351): setDataSource: outside path in JNI is ?x@
05-06 09:14:20.525: E/ActivityThread(5351): Service com.zafar.test.BatteryService has leaked IntentReceiver com.zafar.test.BatteryService$1@40536548 that was originally registered here. Are you missing a call to unregisterReceiver()?
05-06 09:14:20.525: E/ActivityThread(5351): android.app.IntentReceiverLeaked: Service com.zafar.test.BatteryService has leaked IntentReceiver com.zafar.test.BatteryService$1@40536548 that was originally registered here. Are you missing a call to unregisterReceiver()?
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:756)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:551)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:866)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.ContextImpl.registerReceiver(ContextImpl.java:853)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.ContextImpl.registerReceiver(ContextImpl.java:847)
05-06 09:14:20.525: E/ActivityThread(5351): at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:318)
05-06 09:14:20.525: E/ActivityThread(5351): at com.zafar.test.BatteryService.onStartCommand(BatteryService.java:35)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2043)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.ActivityThread.access$2800(ActivityThread.java:117)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:998)
05-06 09:14:20.525: E/ActivityThread(5351): at android.os.Handler.dispatchMessage(Handler.java:99)
05-06 09:14:20.525: E/ActivityThread(5351): at android.os.Looper.loop(Looper.java:130)
05-06 09:14:20.525: E/ActivityThread(5351): at android.app.ActivityThread.main(ActivityThread.java:3691)
05-06 09:14:20.525: E/ActivityThread(5351): at java.lang.reflect.Method.invokeNative(Native Method)
05-06 09:14:20.525: E/ActivityThread(5351): at java.lang.reflect.Method.invoke(Method.java:507)
05-06 09:14:20.525: E/ActivityThread(5351): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
05-06 09:14:20.525: E/ActivityThread(5351): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
05-06 09:14:20.525: E/ActivityThread(5351): at dalvik.system.NativeStart.main(Native Method)
05-06 09:14:37.810: D/CLIPBOARD(5351): Hide Clipboard dialog at Starting input: finished by someone else... !
请帮助。我在哪里弄错了。
修改
private BroadcastReceiver batteryInfoReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
int level = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, 0);
int plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0);
if(plugged == 2) {
SharedPreferences getAlarms = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
String alarms = getAlarms.getString("ringtone", "default ringtone");
//getting uri from MediaStore via filepath i.e. content://media/internal/audio/media/29
Uri uri = Uri.parse(alarms);
mMediaPlayer = new MediaPlayer();
try {
mMediaPlayer.setDataSource(context, uri);
final AudioManager audioManager = (AudioManager) context
.getSystemService(Context.AUDIO_SERVICE);
if (audioManager.getStreamVolume(AudioManager.STREAM_ALARM) != 0) {
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
mMediaPlayer.prepare();
mMediaPlayer.start();
}
} catch (IOException e) {
//System.out.println("OOPS");
e.getStackTrace();
}
} else if(plugged == 0) {
mMediaPlayer.stop();
}
}
};
答案 0 :(得分：6)
确保在unregisterReceiver完成之前致电onDestroy。在onDestroy服务的上下文无效后，所有已注册的意向接收方将停止运行。 Android通过“泄露的意图接收器”例外警告您，您的应用程序行为不正常。
音乐不会停止，因为不再调用接收器。您应确保在从onDestroy返回之前调用mMediaPlayer.stop。我建议你将所有这些功能提取到不同的方法中，这样就可以更容易地编写应用程序。
private void startMusic(int level);
private void stopMusic();
另外，小心不要泄漏mMusicPlayer如果由于错误而连续两次插入== 2个意图。以防御方式编写代码总是更好，而不是依赖于调用者的额外知识。
异常处理在您的代码中也非常危险。如果音乐开始失败，当您想要停止音乐时，可能会出现空指针异常。
希望这有帮助。
答案 1 :(得分：0)
可能有点迟，但似乎你必须在调用onDestroy（）方法之前调用unregisterReceiver（）。这解决了我的问题。