从后台捕获位置并将其上传到云端或保存到 android 中的本地存储

Question

我想创建一个 android 应用程序，即使应用程序不是运行，它也可以捕获设备位置。我曾尝试制作一个 returns 数据从服务到主线程的应用程序。该应用程序在运行时运行良好，但如果该应用程序关闭，则它不会捕获任何位置。

我已附加我的服务 class。现在它只是捕获位置并更新 UI。即使应用程序处于暂停，它仍 正在工作。但是当应用程序 被销毁 .

时，它 不工作

public class DeviceLocationService extends Service {

private LocationListener listener;
private LocationManager locationManager;
private final String TAG = this.getClass().getName();
private int count = 0;

@SuppressLint("MissingPermission")
@Override
public void onCreate() {
    listener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            Intent i = new Intent(Config.LOCATION_INTENT_FILTER);
            HashMap<Object,Object> hashMap = new HashMap<>();
            Log.d(TAG, "onAccuracyChanged: "+location.getAccuracy());

            hashMap.put("latitude",location.getLatitude());
            hashMap.put("longitude",location.getLongitude());
            hashMap.put("accuracy",location.getAccuracy());
            hashMap.put("provider",location.getProvider());

            JSONObject jo = new JSONObject(hashMap);
            i.putExtra("location_data",jo.toString());
            Log.d(TAG, "onLocationChanged: "+jo.toString());
            sendBroadcast(i);
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            Log.d(TAG, "onStatusChanged: provider "+provider);
            Log.d(TAG, "onStatusChanged: status "+status);
        }

        @Override
        public void onProviderEnabled(String provider) {
            Log.d(TAG, "onProviderEnabled: "+provider);
        }

        @Override
        public void onProviderDisabled(String provider) {
            Intent i = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        }
    };

    locationManager = (LocationManager) getApplicationContext().getSystemService(Context.LOCATION_SERVICE);
    if (locationManager != null) {
        //noinspection MissingPermission
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0,listener);
        locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,0,0,listener);
    }
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

}

Answer 1

要运行您的后台服务需要使用前台服务。

在您的服务中添加以下代码

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
        startMyOwnForeground();
    else
        startForeground(1, new Notification());
    return START_STICKY;
}

@RequiresApi(api = Build.VERSION_CODES.O)
private void startMyOwnForeground(){
    String NOTIFICATION_CHANNEL_ID = "com.example.simpleapp";
    String channelName = "My Background Service";
    NotificationChannel chan = new NotificationChannel(NOTIFICATION_CHANNEL_ID, channelName, NotificationManager.IMPORTANCE_NONE);
    chan.setLightColor(Color.BLUE);
    chan.setLockscreenVisibility(Notification.VISIBILITY_PRIVATE);
    NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    assert manager != null;
    manager.createNotificationChannel(chan);

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
    Notification notification = notificationBuilder.setOngoing(true)
            .setSmallIcon(R.drawable.ic_launcher_background)
            .setContentTitle("App is running in background")
            .setPriority(NotificationManager.IMPORTANCE_MIN)
            .setCategory(Notification.CATEGORY_SERVICE)
            .build();
    startForeground(2, notification);
}

并使用以下代码启动服务：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        startForegroundService(new Intent(this,DeviceLocationService.class));
    } else
        startService(new Intent(this,DeviceLocationService.class));

从后台捕获位置并将其上传到云端或保存到 android 中的本地存储

Capture location from background and upload that to cloud or save to local storage in android

service

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location