App实现可定位

App实现可定位可以通过网络network进行定位access.coarse.location（粗定位)，同时还可以实现更加精确的GPS定位。当然首先需要declare android manifest.
两种权限：
1，网络粗定位

根据其名字网络定位，就知道需要开启网络了

2，精确定位

精确定位默认已经准备好粗定位的权限。

获取LocationManager的引用

locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);

demo
监听位置变化，一旦位置1秒后距离变化一米，即通过Handler更新textview值
代码：

package trend.applocation;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;

import java.util.List;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private static final int REQUEST_LOCATION = 1;
    private TextView text;
    private Handler myhandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case REQUEST_LOCATION:
                    double[] locations = (double[]) msg.obj;
                    text.setText("latitude:" + locations[0] + " longitude:" + locations[1]);
                    break;
                default:
                    break;
            }
        }
    };
    LocationManager locationManager;
    MyLocationListener myLocationListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        text = (TextView) findViewById(R.id.text);
        locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
        List providerlist = locationManager.getAllProviders();
        for(String str : providerlist){
            Log.i(TAG, "onCreate: Provider:"+str);
        }
        myLocationListener = new MyLocationListener();
        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.i(TAG, "onCreate: ------------>cannot permission");
            return;
        }else{
            Log.i(TAG, "onCreate: ------------>has permission");
        }
        //locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 0, myLocationListener);
        Location location_ = new Location(LocationManager.GPS_PROVIDER);

        Log.i(TAG, "onCreate: "+location_.getLatitude());
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, myLocationListener);
        Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        Log.i(TAG, "onCreate: ---->"+location);
    }

    private class MyLocationListener implements LocationListener {
        @Override
        public void onLocationChanged(Location location) {
            double latitude = location.getLatitude();
            double longitude = location.getLongitude();
            double[] locations = new double[2];
            locations[0] = latitude;
            locations[1] = longitude;
            Log.i(TAG, "onLocationChanged: --->"+locations[0]);
            Message.obtain(myhandler, REQUEST_LOCATION, locations).sendToTarget();
        }

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

        }

        @Override
        public void onProviderEnabled(String s) {

        }

        @Override
        public void onProviderDisabled(String s) {

        }
    }

    @Override
    protected void onStart() {
        super.onStart();

        LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

        boolean gpsEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        if (!gpsEnabled) {
            enableLocationSettings();
        }

    }

    private void enableLocationSettings() {
        Intent settingsIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
        startActivity(settingsIntent);
    }

    @Override
    protected void onStop() {
        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(myLocationListener);
        super.onStop();
    }
}

结果如下：