获取gps

package com.example.myapplication;

import android.Manifest;
import android.annotation.SuppressLint;
import android.app.Activity;
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.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import androidx.core.app.ActivityCompat;

import java.util.List;

import static com.example.myapplication.MainActivity.tag;

public class FourActivity extends Activity {
    public static final int SHOW_LOCATION = 0;
    private TextView positionTextView;
    private LocationManager locationManager;
    private String provider;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_four);
        positionTextView = (TextView) findViewById(R.id.btfour);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
       
        List<String> providerList = locationManager.getProviders(true);

        if (providerList.contains(LocationManager.GPS_PROVIDER)) {
            provider = LocationManager.GPS_PROVIDER;
            
            Log.d(tag, "测试GPS");
        } else if (providerList.contains(LocationManager.NETWORK_PROVIDER)) {
            provider = LocationManager.NETWORK_PROVIDER;
           
            Log.d(tag, "测试NETWORK");
        } else {
            
            Log.d(tag, "没有可用的位置提供器");

            return;
        }

        @SuppressLint("MissingPermission")Location location = locationManager.getLastKNownLocation(provider);
        if (location != null) {
           
            showLocation(location);
            Log.d(tag, "显示当前设备的位置信息");
        } else {
           
            Log.d(tag, "位置信息是空");
        }
        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.
            Log.d(tag, "检测权限");
            return;
        }
        locationManager.requestLocationUpdates(provider, 2000, 1,
                locationListener);

    }

    protected void onDestroy() {
        super.onDestroy();
        if (locationManager != null) {
            // 关闭程序时将监听器移除
            locationManager.removeUpdates(locationListener);
        };
    }

    LocationListener locationListener = new LocationListener() {

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

        @Override
        public void onProviderEnabled(String provider) {
        }

        @Override
        public void onProviderdisabled(String provider) {
        }

        @Override
        public void onLocationChanged(Location location) {
            // 更新当前设备的位置信息
            showLocation(location);
        }
    };

    public void showLocation(Location location) {
        String currentPosition="纬度"+location.getLatitude()+"\n"+"经度"+location.getLongitude();
        positionTextView.setText(currentPosition);
    }

}