OnLocationChanged() 在后台不起作用答案

【问题标题】：OnLocationChanged() Doesn't work in backgroundOnLocationChanged() 在后台不起作用
【发布时间】：2021-09-13 02:17:10
【问题描述】：

我正在使用以下代码来获取用户的当前位置。当应用程序在前台时，它运行良好，但是当我尝试在后台更改模拟器的位置时，它并没有给我位置。我能做什么？

class BackgroundLocation:Service(),LocationListener {


override fun onBind(intent: Intent?) = null

@SuppressLint("MissingPermission")
override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
    super.onStartCommand(intent, flags, startId)
    val locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager
    val locationListener = BackgroundLocation()
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,5000,10f,locationListener)

    return START_STICKY
}



override fun onLocationChanged(location: Location) {
   println(location.toString())
}

override fun onProviderDisabled(provider: String) {
    
}
override fun onProviderEnabled(provider: String) {
    
}
override fun onStatusChanged(provider: String?, status: Int, extras: Bundle?) {
    
}

}

【问题讨论】：

标签： android kotlin gps location maps

【解决方案1】：

目前您正在使用后台服务。它在运行时工作，一旦应用程序进入后台，服务就会停止。
要在后台持续更新，您需要将服务更新为前台服务。

ForegroundService.java

@Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        String input = intent.getStringExtra("inputExtra");
        createNotificationChannel();
        Intent notificationIntent = new Intent(this, MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this,
                0, notificationIntent, 0);
        Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
                .setContentTitle("Foreground Service")
                .setContentText(input)
                .setSmallIcon(R.drawable.ic_stat_name)
                .setContentIntent(pendingIntent)
                .build();
        startForeground(1, notification);
        //do heavy work on a background thread
        //stopSelf();
        return START_NOT_STICKY;
    }

AndroidManifest.xml

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

MainActivity.java

public void startService() {
    Intent serviceIntent = new Intent(this, ForegroundService.class);
    serviceIntent.putExtra("inputExtra", "Foreground Service Example in Android");
    ContextCompat.startForegroundService(this, serviceIntent);
}

如果您在 android 10 及更高版本上运行该应用，则需要请求后台位置。

  <uses-permission android:name="android.permission.ACCESS_BACKGROUND_LOCATION" />

您可以在此处阅读有关后台位置、限制和前台服务的所有信息 - https://developer.android.com/about/versions/oreo/android-8.0-changes
https://developer.android.com/guide/components/services

【讨论】：