Case code of mobile phone positioning by Android

Android Mobile Phone Location Case Code

The code is as follows:

package com.xuliugen.gpsdemo;
import com.itheima.gpsdemo.R;
import android.app.Activity;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.TextView;
/**
 *  Mobile phone positioning program code 
 * @author xuliugen
 */
public class MainActivity extends Activity {
  //  Use location services 
  private LocationManager lm;
  private MyLocationListener listener;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    lm = (LocationManager) getSystemService(LOCATION_SERVICE);
    //  The way to get the location 
    // List<String> provider = lm.getAllProviders();
    // for(String l: provider){
    // System.out.println(l);
    // }
    listener = new MyLocationListener();
    //  Register for Listening Location Services 
    //  Setting Conditions for Location Providers 
    Criteria criteria = new Criteria();
    criteria.setAccuracy(Criteria.ACCURACY_FINE);
    //  Set parameter refinement: 
    // criteria.setAccuracy(Criteria.ACCURACY_FINE);// Set to maximum precision 
    // criteria.setAltitudeRequired(false);// Altitude information is not required 
    // criteria.setBearingRequired(false);// Azimuth information is not required 
    // criteria.setCostAllowed(true);// Is payment allowed 
    // criteria.setPowerRequirement(Criteria.POWER_LOW);// Requirements for electricity quantity 
    String proveder = lm.getBestProvider(criteria, true);
    lm.requestLocationUpdates(proveder, 0, 0, listener);
  }
  @Override
  protected void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
    //  Cancel listening for location service 
    lm.removeUpdates(listener);
    listener = null;
  }
  class MyLocationListener implements LocationListener {
    /**
     *  Callback when position changes 
     */
    public void onLocationChanged(Location location) {
      String longitude = " Longitude: " + location.getLongitude();
      String latitude = " Latitude: " + location.getLatitude();
      String accuracy = " Accuracy: " + location.getAccuracy();
      TextView textview = new TextView(MainActivity.this);
      textview.setText(longitude + "\n" + latitude + "\n" + accuracy);
      setContentView(textview);
    }
    /**
     *  Callback when state changes   Open -- Shut down   ; Shut down -- Open 
     */
    public void onStatusChanged(String provider, int status, Bundle extras) {
    }
    /**
     *  Certain 1 Location providers are available to use 
     */
    public void onProviderEnabled(String provider) {
    }
    /**
     *  Certain 1 Location providers can no longer be used 
     */
    public void onProviderDisabled(String provider) {
    }
  }
}

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