Androidロケーションマネージャー、GPSロケーションを取得、GPSがない場合はネットワークプロバイダーロケーションに到達
以下のコードを使用して場所を取得しています：
public Location getLocation() {
try {
mLocationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
// getting GPS status
boolean isGPSEnabled = mLocationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
boolean isNetworkEnabled = mLocationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// no network provider is enabled
} else {
// First get location from Network Provider
if (isNetworkEnabled) {
mLocationManager.requestLocationUpdates( LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (mLocationManager != null) {
location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
lat = location.getLatitude();
lng = location.getLongitude();
}
}
}
//get the location by gps
if (isGPSEnabled) {
if (location == null) {
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (mLocationManager != null) {location = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
lat = location.getLatitude();
lng = location.getLongitude();
}
}
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
return location;
}
それは正常に動作していますが、最初にGPS位置情報を取得したいと思います。それが利用できない場合、ロケーションマネージャーはトラブルが発生しているネットワークプロバイダーを照会する必要があります。
これを行うには良い方法をお勧めします。
GPSの場所が利用可能な場合は、まずGPSの場所が必要であると言っていますが、最初に行ったのは、ネットワークプロバイダーから、そしてGPSから場所を取得することです。両方が利用可能な場合、これはネットワークとGPSからも位置を取得します。できることは、これらのケースをif..else ifブロック。に似ている-
if( !isGPSEnabled && !isNetworkEnabled) {
// Can't get location by any way
} else {
if(isGPSEnabled) {
// get location from GPS
} else if(isNetworkEnabled) {
// get location from Network Provider
}
}
そのため、これはまずGPSから位置情報を取得します（利用可能な場合）。そうでない場合は、ネットワークプロバイダーから位置情報を取得しようとします。
[〜＃〜] edit [〜＃〜]：
改善するために、スニペットを投稿します。 try-catch：
boolean gps_enabled = false;
boolean network_enabled = false;
LocationManager lm = (LocationManager) mCtx
.getSystemService(Context.LOCATION_SERVICE);
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
network_enabled = lm.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
Location net_loc = null, gps_loc = null, finalLoc = null;
if (gps_enabled)
gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (network_enabled)
net_loc = lm.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (gps_loc != null && net_loc != null) {
//smaller the number more accurate result will
if (gps_loc.getAccuracy() > net_loc.getAccuracy())
finalLoc = net_loc;
else
finalLoc = gps_loc;
// I used this just to get an idea (if both avail, its upto you which you want to take as I've taken location with more accuracy)
} else {
if (gps_loc != null) {
finalLoc = gps_loc;
} else if (net_loc != null) {
finalLoc = net_loc;
}
}
ここで、finalLocのnullを確認し、そうでない場合はreturn itを確認します。上記のコードは、目的の（finalLoc）の場所を返す関数に記述できます。これが役立つと思います。
これを行うための推奨される方法は、LocationClientを使用することです。
最初に、位置更新間隔値を定義します。これをニーズに合わせて調整します。
_private static final int MILLISECONDS_PER_SECOND = 1000;
private static final long UPDATE_INTERVAL = MILLISECONDS_PER_SECOND * UPDATE_INTERVAL_IN_SECONDS;
private static final int FASTEST_INTERVAL_IN_SECONDS = 1;
private static final long FASTEST_INTERVAL = MILLISECONDS_PER_SECOND * FASTEST_INTERVAL_IN_SECONDS;
_Activityに_GooglePlayServicesClient.ConnectionCallbacks_、_GooglePlayServicesClient.OnConnectionFailedListener_、およびLocationListenerを実装させます。
_public class LocationActivity extends Activity implements
GooglePlayServicesClient.ConnectionCallbacks, GooglePlayServicesClient.OnConnectionFailedListener, LocationListener {}
_次に、LocationClientのonCreate()メソッドにActivityを設定します。
_public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mLocationClient = new LocationClient(this, this, this);
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
}
_必要なメソッドをActivity;に追加します。 onConnected()は、LocationClientconnectが呼び出されたときに呼び出されるメソッドです。 onLocationChanged()は、最新の場所を取得する場所です。
_@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.w(TAG, "Location client connection failed");
}
@Override
public void onConnected(Bundle dataBundle) {
Log.d(TAG, "Location client connected");
mLocationClient.requestLocationUpdates(mLocationRequest, this);
}
@Override
public void onDisconnected() {
Log.d(TAG, "Location client disconnected");
}
@Override
public void onLocationChanged(Location location) {
if (location != null) {
Log.d(TAG, "Updated Location: " + Double.toString(location.getLatitude()) + "," + Double.toString(location.getLongitude()));
} else {
Log.d(TAG, "Updated location NULL");
}
}
_必ずLocationClientを接続/切断して、絶対に必要なときにだけ余分なバッテリーを使用するようにしてください。そうすると、GPSが無期限に実行されなくなります。 LocationClientは、そこからデータを取得するために接続する必要があります。
_public void onResume() {
super.onResume();
mLocationClient.connect();
}
public void onStop() {
if (mLocationClient.isConnected()) {
mLocationClient.removeLocationUpdates(this);
}
mLocationClient.disconnect();
super.onStop();
}
_ユーザーの場所を取得します。最初にLocationClient;を使用してみてください。それが失敗した場合、LocationManagerにフォールバックします。
_public Location getLocation() {
if (mLocationClient != null && mLocationClient.isConnected()) {
return mLocationClient.getLastLocation();
} else {
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
if (locationManager != null) {
Location lastKnownLocationGPS = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (lastKnownLocationGPS != null) {
return lastKnownLocationGPS;
} else {
return locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
}
} else {
return null;
}
}
}
_googleの開発者がGPSセンサー、磁力計、加速度計の融合で開発した融合APIを使用し、Wifiまたはセル位置を使用して位置を計算または推定します。また、建物内の位置情報を正確に更新することもできます。
package com.example.ashis.gpslocation;
import Android.app.Activity;
import Android.location.Location;
import Android.os.Bundle;
import Android.support.v7.app.ActionBarActivity;
import Android.support.v7.app.AppCompatActivity;
import Android.util.Log;
import Android.widget.TextView;
import Android.widget.Toast;
import com.google.Android.gms.common.ConnectionResult;
import com.google.Android.gms.common.GooglePlayServicesUtil;
import com.google.Android.gms.common.api.GoogleApiClient;
import com.google.Android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.Android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.Android.gms.location.LocationListener;
import com.google.Android.gms.location.LocationRequest;
import com.google.Android.gms.location.LocationServices;
import Java.util.concurrent.Executors;
import Java.util.concurrent.TimeUnit;
/**
* Location sample.
*
* Demonstrates use of the Location API to retrieve the last known location for a device.
* This sample uses Google Play services (GoogleApiClient) but does not need to authenticate a user.
* See https://github.com/googlesamples/Android-google-accounts/tree/master/QuickStart if you are
* also using APIs that need authentication.
*/
public class MainActivity extends Activity implements LocationListener,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener {
private static final long ONE_MIN = 500;
private static final long TWO_MIN = 500;
private static final long FIVE_MIN = 500;
private static final long POLLING_FREQ = 1000 * 20;
private static final long FASTEST_UPDATE_FREQ = 1000 * 5;
private static final float MIN_ACCURACY = 1.0f;
private static final float MIN_LAST_READ_ACCURACY = 1;
private LocationRequest mLocationRequest;
private Location mBestReading;
TextView tv;
private GoogleApiClient mGoogleApiClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (!servicesAvailable()) {
finish();
}
setContentView(R.layout.activity_main);
tv= (TextView) findViewById(R.id.tv1);
mLocationRequest = LocationRequest.create();
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setInterval(POLLING_FREQ);
mLocationRequest.setFastestInterval(FASTEST_UPDATE_FREQ);
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
@Override
protected void onResume() {
super.onResume();
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
}
@Override
protected void onPause() {d
super.onPause();
if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
tv.setText(location + "");
// Determine whether new location is better than current best
// estimate
if (null == mBestReading || location.getAccuracy() < mBestReading.getAccuracy()) {
mBestReading = location;
if (mBestReading.getAccuracy() < MIN_ACCURACY) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
}
}
}
@Override
public void onConnected(Bundle dataBundle) {
// Get first reading. Get additional location updates if necessary
if (servicesAvailable()) {
// Get best last location measurement meeting criteria
mBestReading = bestLastKnownLocation(MIN_LAST_READ_ACCURACY, FIVE_MIN);
if (null == mBestReading
|| mBestReading.getAccuracy() > MIN_LAST_READ_ACCURACY
|| mBestReading.getTime() < System.currentTimeMillis() - TWO_MIN) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
//Schedule a runnable to unregister location listeners
@Override
public void run() {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, MainActivity.this);
}
}, ONE_MIN, TimeUnit.MILLISECONDS);
}
}
}
@Override
public void onConnectionSuspended(int i) {
}
private Location bestLastKnownLocation(float minAccuracy, long minTime) {
Location bestResult = null;
float bestAccuracy = Float.MAX_VALUE;
long bestTime = Long.MIN_VALUE;
// Get the best most recent location currently available
Location mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
//tv.setText(mCurrentLocation+"");
if (mCurrentLocation != null) {
float accuracy = mCurrentLocation.getAccuracy();
long time = mCurrentLocation.getTime();
if (accuracy < bestAccuracy) {
bestResult = mCurrentLocation;
bestAccuracy = accuracy;
bestTime = time;
}
}
// Return best reading or null
if (bestAccuracy > minAccuracy || bestTime < minTime) {
return null;
}
else {
return bestResult;
}
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
private boolean servicesAvailable() {
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (ConnectionResult.SUCCESS == resultCode) {
return true;
}
else {
GooglePlayServicesUtil.getErrorDialog(resultCode, this, 0).show();
return false;
}
}
}
バックグラウンドサービス内で実行し、フォアグラウンドでデータを取得する場合は、次のいずれかを使用して、テストと検証を行います。
public class MyService extends Service
implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
com.google.Android.gms.location.LocationListener {
private static final int ASHIS = 1234;
Intent intentForPendingIntent;
HandlerThread handlerThread;
Looper looper;
GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRrequest;
private static final int UPDATE_INTERVAL = 1000;
private static final int FASTEST_INTERVAL = 100;
private static final int DSIPLACEMENT_UPDATES = 1;
;
private Handler handler1;
private Runnable runable1;
private Location mLastLocation;
private float waitingTime;
private int waiting2min;
private Location locationOld;
private double distance;
private float totalWaiting;
private float speed;
private long timeGpsUpdate;
private long timeOld;
private NotificationManager mNotificationManager;
Notification notification;
PendingIntent resultPendingIntent;
NotificationCompat.Builder mBuilder;
// Sets an ID for the notification
int mNotificationId = 001;
private static final String TAG = "BroadcastService";
public static final String BROADCAST_ACTION = "speedExceeded";
private final Handler handler = new Handler();
Intent intentforBroadcast;
int counter = 0;
private Runnable sendUpdatesToUI;
@Nullable
@Override
public IBinder onBind(Intent intent) {
Toast.makeText(MyService.this, "binder", Toast.LENGTH_SHORT).show();
return null;
}
@Override
public void onCreate() {
showNotification();
intentforBroadcast = new Intent(BROADCAST_ACTION);
Toast.makeText(MyService.this, "created", Toast.LENGTH_SHORT).show();
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
createLocationRequest();
mGoogleApiClient.connect();
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
private void showNotification() {
mBuilder =
(NotificationCompat.Builder) new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_media_play)
.setContentTitle("Total Waiting Time")
.setContentText(totalWaiting+"");
Intent resultIntent = new Intent(this, trackingFusion.class);
// Because clicking the notification opens a new ("special") activity, there's
// no need to create an artificial back stack.
PendingIntent resultPendingIntent =
PendingIntent.getActivity(
this,
0,
resultIntent,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotifyMgr =
(NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Builds the notification and issues it.
mNotifyMgr.notify(mNotificationId, mBuilder.build());
startForeground(001, mBuilder.getNotification());
}
@Override
public void onLocationChanged(Location location) {
//handler.removeCallbacks(runable);
Toast.makeText(MyService.this, "speed" + speed, Toast.LENGTH_SHORT).show();
timeGpsUpdate = location.getTime();
float delta = (timeGpsUpdate - timeOld) / 1000;
if (location.getAccuracy() < 100) {
speed = location.getSpeed();
distance += mLastLocation.distanceTo(location);
Log.e("distance", "onLocationChanged: " + distance);
//mLastLocation = location;
//newLocation = mLastLocation;
Log.e("location:", location + "");
//speed = (long) (distance / delta);
locationOld = location;
mLastLocation = location;
diaplayViews();
}
diaplayViews();
/*if (map != null) {
map.addMarker(new MarkerOptions()
.position(new LatLng(location.getLatitude(), location.getLongitude()))
.title("Hello world"));
}*/
}
private void createLocationRequest() {
mLocationRrequest = new LocationRequest();
mLocationRrequest.setInterval(UPDATE_INTERVAL);
mLocationRrequest.setFastestInterval(FASTEST_INTERVAL);
mLocationRrequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRrequest.setSmallestDisplacement(DSIPLACEMENT_UPDATES);
}
private void methodToCalculateWaitingTime() {
if (handler1 != null) {
handler1.removeCallbacks(runable1);
}
Log.e("Here", "here1");
handler1 = new Handler(Looper.getMainLooper());
runable1 = new Runnable() {
public void run() {
Log.e("Here", "here2:" + mLastLocation.getSpeed());
if (mLastLocation != null) {
diaplayViews();
if ((mLastLocation.getSpeed() == 0.0)) {
increaseTime();
} else {
if (waitingTime <= 120) {
waiting2min = 0;
}
}
handler1.postDelayed(this, 10000);
} else {
if (ActivityCompat.checkSelfPermission(MyService.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MyService.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;
}
locationOld = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
mLastLocation = locationOld;
}
}
};
handler1.postDelayed(runable1, 10000);
}
private void diaplayViews() {
float price = (float) (14 + distance * 0.5);
//textDistance.setText(waitingTime);a
}
private void increaseTime() {
waiting2min = waiting2min + 10;
if (waiting2min >= 120)
{
if (waiting2min == 120) {
waitingTime = waitingTime + 2 * 60;
} else {
waitingTime = waitingTime + 10;
}
totalWaiting = waitingTime / 60;
showNotification();
Log.e("waiting Time", "increaseTime: " + totalWaiting);
}
}
@Override
public void onDestroy() {
Toast.makeText(MyService.this, "distroyed", Toast.LENGTH_SHORT).show();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
mGoogleApiClient.disconnect();
}
@Override
public void onConnected(Bundle bundle) {
Log.e("Connection_fusion", "connected");
startLocationUpdates();
}
@Override
public void onConnectionSuspended(int i) {
}
private void startLocationUpdates() {
Location location = plotTheInitialMarkerAndGetInitialGps();
if (location == null) {
plotTheInitialMarkerAndGetInitialGps();
} else {
mLastLocation = location;
methodToCalculateWaitingTime();
}
}
private Location plotTheInitialMarkerAndGetInitialGps() {
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 null;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRrequest, this);
locationOld = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if ((locationOld != null)) {
mLastLocation = locationOld;
timeOld = locationOld.getTime();
} else {
startLocationUpdates();
}
return mLastLocation;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
onStart(intent, startId);
Toast.makeText(MyService.this, "start command", Toast.LENGTH_SHORT).show();
sendUpdatesToUI = new Runnable() {
public void run() {
DisplayLoggingInfo();
handler.postDelayed(this, 10000); // 5 seconds
}
};
handler.postDelayed(sendUpdatesToUI, 10000); // 1 second
Log.i("LocalService", "Received start id " + startId + ": " + intent);
return START_NOT_STICKY;
}
@Override
public void onStart(Intent intent, int startId) {
sendUpdatesToUI = new Runnable() {
public void run() {
Log.e("sent", "sent");
DisplayLoggingInfo();
handler.postDelayed(this, 5000); // 5 seconds
}
};
handler.postDelayed(sendUpdatesToUI, 1000); // 1 second
Log.i("LocalService", "Received start id " + startId + ": " + intent);
super.onStart(intent, startId);
}
private void DisplayLoggingInfo() {
Log.d(TAG, "entered DisplayLoggingInfo");
intentforBroadcast.putExtra("distance", distance);
LocalBroadcastManager.getInstance(this).sendBroadcast(intentforBroadcast);
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onMapReady(GoogleMap googleMap) {
}
}
上記のコードにいくつかの変更を加えて、GPSとネットワークの両方による位置修正を約5秒間探し、その中から最もよく知られている位置を取得しました。
public class LocationService implements LocationListener {
boolean isGPSEnabled = false;
boolean isNetworkEnabled = false;
boolean canGetLocation = false;
final static long MIN_TIME_INTERVAL = 60 * 1000L;
Location location;
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0; // 10
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1; // 1 minute
protected LocationManager locationManager;
private CountDownTimer timer = new CountDownTimer(5 * 1000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
stopUsingGPS();
}
};
public LocationService() {
super(R.id.gps_service_id);
}
public void start() {
if (Utils.isNetworkAvailable(context)) {
try {
timer.start();
locationManager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
Location tempLocation = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (tempLocation != null
&& isBetterLocation(tempLocation,
location))
location = tempLocation;
}
}
if (isGPSEnabled) {
locationManager.requestSingleUpdate(
LocationManager.GPS_PROVIDER, this, null);
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
Location tempLocation = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (tempLocation != null
&& isBetterLocation(tempLocation,
location))
location = tempLocation;
}
}
} catch (Exception e) {
onTaskError(e.getMessage());
e.printStackTrace();
}
} else {
onOfflineResponse(requestData);
}
}
public void stopUsingGPS() {
if (locationManager != null) {
locationManager.removeUpdates(LocationService.this);
}
}
public boolean canGetLocation() {
locationManager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
return isGPSEnabled || isNetworkEnabled;
}
@Override
public void onLocationChanged(Location location) {
if (location != null
&& isBetterLocation(location, this.location)) {
this.location = location;
}
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public Object getResponseObject(Object location) {
return location;
}
public static boolean isBetterLocation(Location location,
Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return true;
}
// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > MIN_TIME_INTERVAL;
boolean isSignificantlyOlder = timeDelta < -MIN_TIME_INTERVAL;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location,
// use the new location
// because the user has likely moved
if (isSignificantlyNewer) {
return true;
// If the new location is more than two minutes older, it must
// be worse
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation
.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and
// accuracy
if (isMoreAccurate) {
return true;
} else if (isNewer && !isLessAccurate) {
return true;
} else if (isNewer && !isSignificantlyLessAccurate
&& isFromSameProvider) {
return true;
}
return false;
}
}
上記のクラスでは、GPSとネットワークの両方にロケーションリスナーを登録しているため、onLocationChangedコールバックはそれらのいずれかまたは両方で複数回呼び出すことができ、新しいロケーション修正を私たちのものと比較するだけです。すでに最高のものを持っています。
メインクラス：
public class AndroidLocationActivity extends Activity {
Button btnGPSShowLocation;
Button btnNWShowLocation;
AppLocationService appLocationService;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
appLocationService = new AppLocationService(
AndroidLocationActivity.this);
btnGPSShowLocation = (Button) findViewById(R.id.btnGPSShowLocation);
btnGPSShowLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Location gpsLocation = appLocationService
.getLocation(LocationManager.GPS_PROVIDER);
if (gpsLocation != null) {
double latitude = gpsLocation.getLatitude();
double longitude = gpsLocation.getLongitude();
Toast.makeText(
getApplicationContext(),
"Mobile Location (GPS): \nLatitude: " + latitude
+ "\nLongitude: " + longitude,
Toast.LENGTH_LONG).show();
} else {
showSettingsAlert("GPS");
}
}
});
btnNWShowLocation = (Button) findViewById(R.id.btnNWShowLocation);
btnNWShowLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Location nwLocation = appLocationService
.getLocation(LocationManager.NETWORK_PROVIDER);
if (nwLocation != null) {
double latitude = nwLocation.getLatitude();
double longitude = nwLocation.getLongitude();
Toast.makeText(
getApplicationContext(),
"Mobile Location (NW): \nLatitude: " + latitude
+ "\nLongitude: " + longitude,
Toast.LENGTH_LONG).show();
} else {
showSettingsAlert("NETWORK");
}
}
});
}
public void showSettingsAlert(String provider) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(
AndroidLocationActivity.this);
alertDialog.setTitle(provider + " SETTINGS");
alertDialog.setMessage(provider
+ " is not enabled! Want to go to settings menu?");
alertDialog.setPositiveButton("Settings",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS);
AndroidLocationActivity.this.startActivity(intent);
}
});
alertDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
次の授業：
public class AppLocationService extends Service implements LocationListener {
protected LocationManager locationManager;
Location location;
private static final long MIN_DISTANCE_FOR_UPDATE = 10;
private static final long MIN_TIME_FOR_UPDATE = 1000 * 60 * 2;
public AppLocationService(Context context) {
locationManager = (LocationManager) context
.getSystemService(LOCATION_SERVICE);
}
public Location getLocation(String provider) {
if (locationManager.isProviderEnabled(provider)) {
locationManager.requestLocationUpdates(provider,
MIN_TIME_FOR_UPDATE, MIN_DISTANCE_FOR_UPDATE, this);
if (locationManager != null) {
location = locationManager.getLastKnownLocation(provider);
return location;
}
}
return null;
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
マニフェストに追加することを忘れないでください。
<!-- to get location using GPS -->
<uses-permission Android:name="Android.permission.ACCESS_FINE_LOCATION" />
<!-- to get location using NetworkProvider -->
<uses-permission Android:name="Android.permission.INTERNET" />