关闭应用程序时Android服务无法正常工作

Question

我正在使用的 android 服务遇到问题。该服务即将每 5 分钟获取一次用户的位置。一切似乎都很顺利，除非我杀死该应用程序，该服务不会做任何事情。在代码中，我认为您将每 60 秒检查一次，但这将更改为 5 分钟。

最低目标版本：API 23

目标版本：API 29

Android 清单：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.venomapps.meets">

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.FOREGROUND_SERVICE"/>

<application
    android:name=".Utils.App"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".Activities.RegisterActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".Activities.MainActivity" />
    <activity android:name=".Activities.LoginActivity">
    </activity>

    <service android:name=".Services.LocationService"
        android:enabled="true"
        android:exported="true"/>
</application>

执行服务的代码：

AlarmManager am=(AlarmManager)getApplicationContext().getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(getApplicationContext(), LocationService.class);                            intent.setAction(Constants.ACTION_START_LOCATION_SERVICE);
PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), Constants.LOCATION_SERVICE_ID, intent, PendingIntent.FLAG_UPDATE_CURRENT);
am.setRepeating(AlarmManager.ELAPSED_REALTIME, SystemClock.elapsedRealtime(), 60000, pendingIntent);

服务：

public class LocationService extends Service {
private LocationCallback locationCallback = new LocationCallback() {
    @Override
    public void onLocationResult(LocationResult locationResult) {
        super.onLocationResult(locationResult);
        if (locationResult != null && locationResult.getLastLocation() != null) {
            double latitude = locationResult.getLastLocation().getLatitude();
            double longitude = locationResult.getLastLocation().getLongitude();
            Log.d("LOCATION_UPDATE", latitude + ", " + longitude);
            stopLocationService();
        }
    }
};

@Nullable
@Override
public IBinder onBind(Intent intent) {
    throw new UnsupportedOperationException("Not yet implemented");
}

public void startLocationService() {
    String channelId = "location_notification_channel";
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    Intent resultIntent = new Intent();
    PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, resultIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(
            getApplicationContext(),
            channelId
    );
    builder.setSmallIcon(R.drawable.ic_app);
    builder.setContentTitle("Location Service");
    builder.setDefaults(NotificationCompat.DEFAULT_ALL);
    builder.setContentText("Running");
    builder.setContentIntent(pendingIntent);
    builder.setAutoCancel(false);
    builder.setPriority(NotificationCompat.PRIORITY_MAX);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        if (notificationManager != null && notificationManager.getNotificationChannel(channelId) == null) {
            NotificationChannel notificationChannel = new NotificationChannel(
                    channelId, "Location Service", NotificationManager.IMPORTANCE_HIGH
            );
            notificationChannel.setDescription("This channel is used by location service");
            notificationManager.createNotificationChannel(notificationChannel);
        }
    }

    LocationRequest locationRequest = new LocationRequest();
    locationRequest.setInterval(8000);
    locationRequest.setFastestInterval(5000);
    locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }
    LocationServices.getFusedLocationProviderClient(this)
            .requestLocationUpdates(locationRequest, locationCallback, Looper.getMainLooper());
    startForeground(Constants.LOCATION_SERVICE_ID, builder.build());
}

private void stopLocationService(){
    LocationServices.getFusedLocationProviderClient(this)
            .removeLocationUpdates(locationCallback);
    stopForeground(true);
    stopSelf();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if(intent != null){
        String action = intent.getAction();
        if(action != null){
            if(action.equals(Constants.ACTION_START_LOCATION_SERVICE)){
                startLocationService();
            }
        }
    }
    return super.onStartCommand(intent, flags, startId);
}

}

Answer 1

如果用于此目的，则不推荐使用 AlarmManager。看看WorkManager。