Question

我正在写一个简单的应用程序。布局只有一个名为coords的textview，如下面的代码所示。应用程序使用位置侦听器来更新textview，将其值设置为当前位置的纬度和经度。

当我测试应用程序时，它会崩溃。首先，我试图注释掉负责设置textview值的行，因为我认为对字符串的修改可能会搞砸了......但仍然会崩溃。

然后我试图在

之间切换

import com.google.android.gms.location.LocationListener;

和

import android.location.LocationListener;

但是当使用第一个时我得到了一个错误：无法解析方法requestLocationUpdates（...）

任何提示，我做错了什么？那是我现在的代码：

import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
//import com.google.android.gms.location.LocationListener;
import android.location.LocationListener;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class MapActivity extends AppCompatActivity {

    TextView coords;

    // Acquire a reference to the system Location Manager
    LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map);
        coords = (TextView)findViewById(R.id.tvCoords);

        // Define a listener that responds to location updates
        LocationListener locationListener = new LocationListener() {
            public void onLocationChanged(Location location) {
                // Called when a new location is found by the network location provider.
                //makeUseOfNewLocation(location);
                //coords.setText(String.valueOf(location.getLatitude()) + " " + String.valueOf(location.getLongitude()));
            }

            public void onStatusChanged(String provider, int status, Bundle extras) {
            }

            public void onProviderEnabled(String provider) {
            }

            public void onProviderDisabled(String provider) {
            }
        };

        // Register the listener with the Location Manager to receive location updates
        if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }

        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
    }
}

获取当前位置坐标 - Android

0 个答案: