Android—定位

  1 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
  2     private Button bt_main_checkin;
  3     private  Toolbar toolbar;
  4     private TextView tv_main_test;
  5 
  6     private LocationManager mLocationManager;
  7 
  8     private static final int TEN_SECONDS = 10000;
  9     private static final int TEN_METERS = 10;
 10     private static final int TWO_MINUTES = 1000 * 60 * 2;
 11 
 12     @Override
 13     protected void onCreate(Bundle savedInstanceState) {
 14         super.onCreate(savedInstanceState);
 15         setContentView(R.layout.activity_main);
 16         initView();
 17         bt_main_checkin.setOnClickListener(this);
 18         setSupportActionBar(toolbar);
 19         mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
 20         Location LatLng = setup();
 21 //        Toast.makeText(this, LatLng.getLatitude() + "|" + LatLng.getLongitude(), Toast.LENGTH_SHORT).show();
 22         tv_main_test.setText(LatLng.getLatitude() + "|" + LatLng.getLongitude());
 23     }
 24 
 25     private void initView() {
 26         toolbar = (Toolbar) findViewById(R.id.toolbar);
 27         bt_main_checkin = (Button) findViewById(R.id.bt_main_checkin);
 28         tv_main_test= (TextView) findViewById(R.id.tv_main_test);
 29     }
 30 
 31     @Override
 32     protected void onResume() {
 33         super.onResume();
 34         setup();
 35     }
 36 
 37     @Override
 38     protected void onStop() {
 39         super.onStop();
 40         if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
 41             return;
 42         }
 43         mLocationManager.removeUpdates(listener);
 44     }
 45 
 46     @Override
 47     protected void onStart() {
 48         super.onStart();
 49         LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
 50         final boolean gpsenable = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
 51         if (!gpsenable) {
 52             new EnableGpsDialogFragment().show(getFragmentManager(), "enableGpsDialog");
 53         }
 54     }
 55 
 56     @Override
 57     public void onClick(View v) {
 58 
 59     }
 60     private Location setup() {
 61         Location gpsLocation = null;
 62         Location networkLocation = null;
 63         if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
 64             // TODO: Consider calling
 65             new EnableGpsDialogFragment().show(getFragmentManager(), "enableGpsDialog");
 66             new EnableNetworkDialogFragment().show(getFragmentManager(), "enableNetworkDialog");
 67             return null;
 68         }
 69         mLocationManager.removeUpdates(listener);
 70         gpsLocation = requestUpdatesFromProvider(LocationManager.GPS_PROVIDER, R.string.not_support_gps);
 71         networkLocation = requestUpdatesFromProvider(LocationManager.NETWORK_PROVIDER, R.string.not_support_network);
 72         if (gpsLocation != null && networkLocation != null) {
 73             return getBetterLocation(gpsLocation, networkLocation);
 74         } else if (gpsLocation != null) {
 75             return gpsLocation;
 76         } else if (networkLocation != null) {
 77             return networkLocation;
 78         }
 79         return null;
 80     }
 81 
 82     private Location requestUpdatesFromProvider(final String provider, final int errorResId) {
 83         Location location = null;
 84         if (mLocationManager.isProviderEnabled(provider)) {
 85             if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
 86                 // TODO: Consider calling
 87                 return null;
 88             }
 89             mLocationManager.requestLocationUpdates(provider, TEN_SECONDS, TEN_METERS, listener);
 90             location = mLocationManager.getLastKnownLocation(provider);
 91         } else {
 92             Toast.makeText(this, errorResId, Toast.LENGTH_SHORT).show();
 93         }
 94         return location;
 95     }
 96 
 97     private final LocationListener listener = new LocationListener() {
 98         @Override
 99         public void onLocationChanged(Location location) {
100             // TODO: 2016/3/23 updata ui in it
101 
102         }
103 
104         @Override
105         public void onStatusChanged(String provider, int status, Bundle extras) {
106 
107         }
108 
109         @Override
110         public void onProviderEnabled(String provider) {
111 
112         }
113 
114         @Override
115         public void onProviderDisabled(String provider) {
116 
117         }
118     };
119 
120     protected Location getBetterLocation(Location newLocation, Location currentBestLocation) {
121         if (currentBestLocation == null) {
122             // A new location is always better than no location
123             return newLocation;
124         }
125         // If it‘s been more than two minutes since the current location, use the new location
126         // because the user has likely moved.
127         long timeDelta = newLocation.getTime() - currentBestLocation.getTime();
128         boolean isSignficantlyNewer = timeDelta > TWO_MINUTES;
129         boolean isSignficantlyOlder = timeDelta < -TWO_MINUTES;
130         boolean isNewer = timeDelta > 0;
131         if (isSignficantlyNewer) {
132             return newLocation;
133         } else if (isSignficantlyOlder) {
134             return currentBestLocation;
135         }
136         // Determine location quality using a combination of timeliness and accuracy
137         int accuracyDelta = (int) (newLocation.getAccuracy() - currentBestLocation.getAccuracy());
138         boolean isLessAccurate = accuracyDelta > 0;
139         boolean isMoreAccurate = accuracyDelta < 0;
140         boolean isSignificantlyLessAccurate = accuracyDelta > 200;
141 
142         boolean isFromSameProvider = isSameProvider(newLocation.getProvider(),
143                 currentBestLocation.getProvider());
144         if (isMoreAccurate) {
145             return newLocation;
146         } else if (isNewer && !isLessAccurate) {
147             return newLocation;
148         } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
149             return newLocation;
150         }
151         return currentBestLocation;
152     }
153 
154     /**
155      * Checks whether two providers are the same
156      */
157     private boolean isSameProvider(String provider1, String provider2) {
158         if (provider1 == null) {
159             return provider2 == null;
160         }
161         return provider1.equals(provider2);
162     }
163 
164 
165     @Override
166     public boolean onCreateOptionsMenu(Menu menu) {
167         // Inflate the menu; this adds items to the action bar if it is present.
168         getMenuInflater().inflate(R.menu.menu_main, menu);
169         return true;
170     }
171 
172     @Override
173     public boolean onOptionsItemSelected(MenuItem item) {
174         // Handle action bar item clicks here. The action bar will
175         // automatically handle clicks on the Home/Up button, so long
176         // as you specify a parent activity in AndroidManifest.xml.
177         int id = item.getItemId();
178         switch (id){
179             case R.id.action_settings:
180                 break;
181             case R.id.action_register:
182                 break;
183             default:
184                 break;
185         }
186         //noinspection SimplifiableIfStatement
187 //        if (id == R.id.action_settings) {
188 //            return true;
189 //        }
190 
191         return true;
192     }
193 
194 }