在 android 中通过 GPS 访问位置

Question

我一直在尝试通过以下代码通过 gps 获取位置。当我将提供商更改为 NETWORK_PROVIDER 时，我会收到更新，但当我使用 GPS_PROVIDER 时，我没有收到任何数据或位置。我参考了以下教程- http://www.viralandroid.com/2015/12/how-to-get-current-gps-location-programmatically-in-android.html 和 https://www.youtube.com/watch?v=QNb_3QKSmMk

package app.com.example.android.locationapp;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements LocationListener {
    TextView lat, longi;
    LocationManager locationManager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    lat = (TextView) findViewById(R.id.textView2);
    longi = (TextView) findViewById(R.id.textView4);
    locationManager = (LocationManager) getSystemService(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) {

        Toast.makeText(this, "Please enable location permission", Toast.LENGTH_SHORT).show();
        return;
    } else {
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
        Log.i("MainActivity", "reqLocationUpdates() method called");

    }
}

@Override
public void onLocationChanged(Location location) {
    Log.i("MainActivity","onLocation executed");
    lat.setText(location.getLatitude() + "");
    longi.setText(location.getLongitude() + "");
}

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

@Override
public void onProviderEnabled(String s) {

}

@Override
public void onProviderDisabled(String s) {
    Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
    startActivity(intent);
}

@Override
protected void onDestroy() {
    super.onDestroy();
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    locationManager.removeUpdates(this);
}

}

Answer 1

确保您设置了正确的位置权限。并确保您正在执行运行时权限检查。但很可能您的问题是卫星的 LOS。如果你在室内测试，你可能收不到卫星信号。没有它，你无法确定你的位置，它也永远不会给你打电话。到外面去测试看看是否有效

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