如何在Android中使用locationManager使用GPS？

Question

我看了很多关于它的讨论，但是我仍然无法在带有位置管理器的android应用中显示gps坐标：

如果我理解得很好，我必须先做：

LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

向位置经理收取费用，之后

locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, (LocationListener) this);

更新位置，最后

Location position = locationManager.getLastKnownLocation( LocationManager.GPS_PROVIDER);

问题是这不起作用。 所以我想我不太了解。 请告诉我什么是好的语法。

在此先感谢您的帮助 ！

编辑：

我在清单中添加了这些权限

 <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.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-feature android:name="android.hardware.location.network" />
    <uses-feature android:name="android.hardware.location.gps" />
    <uses-feature android:name="android.hardware.wifi" />

Answer 1

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtLat = (TextView) findViewById(R.id.textview1);

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
@Override
public void onLocationChanged(Location location) {
txtLat = (TextView) findViewById(R.id.textview1);
txtLat.setText("Latitude:" + location.getLatitude() + ", Longitude:" + location.getLongitude());
}

@Override
public void onProviderDisabled(String provider) {
Log.d("Latitude","disable");
}

@Override
public void onProviderEnabled(String provider) {
Log.d("Latitude","enable");
}

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

Answer 2

用于获取位置的代码段。

LocationManager locationManager;

locationManager = (LocationManager) getSystemService(context.LOCATION_SERVICE);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    return;// and ask for run time permission
}
Location currentLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (currentLocation != null) {
    mypoint = new GeoPoint(currentLocation.getLatitude(), currentLocation.getLongitude());
}
markerForCurrentLocation.setPosition(mypoint);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 1, this);

@Override
public void onLocationChanged(Location location) {

    //Here you will get the current location of your GPS device
    mypoint = new GeoPoint(location.getLatitude(), location.getLongitude());
    markerForCurrentLocation.setPosition(mypoint);
    mapController.animateTo(mypoint);
}

要求运行时位置许可的方法

private void requestLocationPermission() {

    //method asking for runtime location permission
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, LOCATION_PERMISSION_CODE);
    }
}