android 原生gaps

import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.GpsSatellite;
import android.location.GpsStatus;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.location.LocationProvider;
import android.os.Bundle;
import android.provider.Settings;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.widget.EditText;
import android.widget.Toast;

import java.util.Iterator;

public class MainActivity extends Activity {
    private EditText editText;
    private LocationManager lm;
    private static final String TAG = "GpsActivity";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        editText = findViewById(R.id.editText);
        lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            Toast.makeText(this, "请开启GPS导航--", Toast.LENGTH_LONG).show();
            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            startActivityForResult(intent, 0);
            return;
        }
        String bestProvider = lm.getBestProvider(getCriteria(), true);
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        Location location = lm.getLastKnownLocation(bestProvider);
        updateView(location);
        lm.addGpsStatusListener(listener);
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, locationListener);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        lm.removeUpdates(locationListener);

    }

    private LocationListener locationListener = new LocationListener() {
        @Override
        public void onLocationChanged(Location location) {
            updateView(location);
            Log.i(TAG, "时间：" + location.getTime());
            Log.i(TAG, "经度：" + location.getLongitude());
            Log.i(TAG, "纬度：" + location.getLatitude());
            Log.i(TAG, "海拔：" + location.getAltitude());
        }

        @Override
        public void onStatusChanged(String provider, int status, Bundle extras) {
            switch (status) {
                case LocationProvider.AVAILABLE:
                    Log.i(TAG, "当前GPS状态为可见状态");
                    break;
                case LocationProvider.OUT_OF_SERVICE:
                    Log.i(TAG, "当前GPS状态为服务区外状态");
                    break;
                case LocationProvider.TEMPORARILY_UNAVAILABLE:
                    Log.i(TAG, "当前GPS状态为暂停服务状态");
                    break;
            }
        }

        @Override
        public void onProviderEnabled(String provider) {
            if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            Location location = lm.getLastKnownLocation(provider);
            updateView(location);
        }

        @Override
        public void onProviderDisabled(String provider) {
            updateView(null);
        }
    };

    private void updateView(Location location) {
        if (location != null) {
            editText.setText("设备位置信息\n\n经度：");
            editText.append(String.valueOf(location.getLongitude()));
            editText.append("\n纬度：");
            editText.append(String.valueOf(location.getLatitude()));
        } else {
            // 清空EditText对象  
            editText.getEditableText().clear();
        }
    }

    private Criteria getCriteria() {
        Criteria criteria = new Criteria();
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        criteria.setSpeedRequired(false);
        criteria.setCostAllowed(false);
        criteria.setBearingRequired(false);
        criteria.setAltitudeRequired(false);
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        return criteria;
    }

    GpsStatus.Listener listener = new GpsStatus.Listener() {
        @Override
        public void onGpsStatusChanged(int event) {
            switch (event) {
                case GpsStatus.GPS_EVENT_FIRST_FIX:
                    Log.i(TAG, "第一次定位");
                    break;
                case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
                    Log.i(TAG, "卫星状态改变");
                    if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        return;
                    }
                    GpsStatus gpsStatus = lm.getGpsStatus(null);
                    int maxSatellite = gpsStatus.getMaxSatellites();
                    Iterator<GpsSatellite> iters = gpsStatus.getSatellites().iterator();
                    int count = 0;
                    while (iters.hasNext() && count <= maxSatellite) {
                        GpsSatellite s = iters.next();
                        count++;
                    }
                    System.out.println("搜索到：" + count + "颗卫星");
                    break;
                case GpsStatus.GPS_EVENT_STARTED:
                    Log.i(TAG, "定位启动");
                    break;
                case GpsStatus.GPS_EVENT_STOPPED:
                    Log.i(TAG, "定位结束");
                    break;
            }
        }
    };
}