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      1 /*
      2  * Copyright 2014 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *       http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.powerprofile.gpson;
     18 
     19 import android.app.Activity;
     20 import android.content.Context;
     21 import android.content.pm.PackageManager;
     22 import android.location.Location;
     23 import android.location.LocationManager;
     24 import android.location.LocationListener;
     25 import android.os.Bundle;
     26 import android.support.v4.app.ActivityCompat;
     27 import android.support.v4.content.ContextCompat;
     28 import android.util.Log;
     29 
     30 public class GpsActivity extends Activity {
     31 
     32     private static final int LOCATION_INTERVAL = 1000;
     33     private static final float LOCATION_DISTANCE = 0f;
     34     private static final int ACCESS_FINE_LOCATION_PERMISSION = 0;
     35     private LocationManager mLocationManager;
     36     private LocationListener mLocationListener;
     37 
     38     protected void onCreate(Bundle savedInstanceState) {
     39         super.onCreate(savedInstanceState);
     40 
     41         int permissionsCheck = ContextCompat.checkSelfPermission(this,
     42                 android.Manifest.permission.ACCESS_FINE_LOCATION);
     43 
     44         if (permissionsCheck != PackageManager.PERMISSION_GRANTED) {
     45             ActivityCompat.requestPermissions(this,
     46                     new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
     47                     ACCESS_FINE_LOCATION_PERMISSION);
     48         }
     49     }
     50 
     51     @Override
     52     public void onRequestPermissionsResult(int requestCode, String permissions[],
     53                                            int[] grantResults) {
     54         switch (requestCode) {
     55             case ACCESS_FINE_LOCATION_PERMISSION: {
     56                 if (grantResults.length > 0
     57                         && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
     58 
     59                     initLocation();
     60                 }
     61                 break;
     62             }
     63         }
     64     }
     65 
     66     private void initLocation() {
     67         mLocationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
     68 
     69         mLocationListener = new LocationListener() {
     70             public void onLocationChanged(Location location) {}
     71 
     72             public void onStatusChanged(String provider, int status, Bundle extras) {}
     73 
     74             public void onProviderEnabled(String provider) {}
     75 
     76             public void onProviderDisabled(String provider) {}
     77         };
     78     }
     79 
     80     @Override
     81     protected void onResume() {
     82         super.onResume();
     83 
     84         if (mLocationManager == null || mLocationListener == null) {
     85             return;
     86         }
     87 
     88         try {
     89             mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER,
     90                     LOCATION_INTERVAL, LOCATION_DISTANCE, mLocationListener);
     91         } catch (SecurityException e) {
     92             e.printStackTrace();
     93         }
     94     }
     95 
     96     @Override
     97     protected void onPause() {
     98         super.onPause();
     99 
    100         if (mLocationManager == null || mLocationListener == null) {
    101             return;
    102         }
    103 
    104         mLocationManager.removeUpdates(mLocationListener);
    105     }
    106 
    107 }
    108