在Android中设置位置的初始值

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity implements LocationListener {

    private LocationManager locationManager;

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

        // 获取LocationManager实例
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

        // 检查定位权限
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // 如果没有权限，则请求权限
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
            return;
        }

        // 注册LocationListener来监听位置变化
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
    }

    @Override
    public void onLocationChanged(Location location) {
        // 处理位置变化
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        // 其他操作...
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // 状态变化时的处理
    }

    @Override
    public void onProviderEnabled(String provider) {
        // 定位功能可用时的处理
    }

    @Override
    public void onProviderDisabled(String provider) {
        // 定位功能不可用时的处理
    }
}

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