Question

我正在尝试让我的GPS在后台运行，因此它可以为我提供有关我在做其他事情时的位置的新信息。

但每次我运行应用程序时都会崩溃。该错误要求我使用Looper.prepare()，但我怎样才能使用GPS？

public class LocationLoggerService extends Service implements LocationListener {

Location location;

String towers;
static final int uniqueID = 1394885;
Thread runner;
boolean keepRunning;

public LocationManager locationManager;

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

@Override
public void onCreate() {

    keepRunning = true;

    runner = new Thread(null, new Runnable() {
        public void run() {
            startGps();
        }
    });
    runner.start();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    // this service will run until we stop it

    return START_STICKY;
}

@Override
public void onLocationChanged(Location location) {

    location = locationManager.getLastKnownLocation(towers);

    String hey1 = Double.toString(location.getLatitude());
    String hey2 = Double.toString(location.getLongitude());

    Toast.makeText(this,
            "TEST onLocationChanged:" + "Lat: " + hey1 + "Long: " + hey2,

            Toast.LENGTH_LONG).show();
}

@Override
public void onProviderEnabled(String s) {
}

@Override
public void onProviderDisabled(String s) {
}

@Override
public void onStatusChanged(String s, int i, Bundle b) {
}

@Override
public void onDestroy() {
    super.onDestroy();
    Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG)
            .show();

}

public void startGps() {
    locationManager = (LocationManager) this
            .getSystemService(Context.LOCATION_SERVICE);
    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
            2000, 0, this);

    location = locationManager.getLastKnownLocation(towers);

    String hey1 = Double.toString(location.getLatitude());
    String hey2 = Double.toString(location.getLongitude());

    Toast.makeText(this, "StartGPS: Lat: " + hey1 + "Long: " + hey2,
            Toast.LENGTH_LONG).show();

}


}

我的清单具有以下权限，如下所示：

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_GPS" />

<service
            android:name="LocationLoggerService"
            android:enabled="true"
            android:exported="false"
            android:label="LocationLoggerService" />

我在logcat中收到此错误，如下所示：

FATAL EXCEPTION: Thread-819
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
at android.os.Handler.<init>(Handler.java:121)
at android.location.LocationManager$ListenerTransport$1.<init>(LocationManager.java:209)
at android.location.LocationManager$ListenerTransport.<init>(LocationManager.java:209)
at android.location.LocationManager._requestLocationUpdates(LocationManager.java:687)
at android.location.LocationManager.requestLocationUpdates(LocationManager.java:512)
at com.example.rememberforme.LocationLoggerService.startGps(LocationLoggerService.java:81)
at com.example.rememberforme.LocationLoggerService$1.run(LocationLoggerService.java:38)
at java.lang.Thread.run(Thread.java:856)

Answer 1

Heey，

我发现您缺少服务的onCommandStart方法。

@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
    //this service will run until we stop it

    return START_STICKY;
}

您是否添加了清单文件中所需的所有权限？我不确定你需要哪一个，但其中一个/或多个会这样做：

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_GPS"/>

Android：在后台运行应用程序的问题

1 个答案: