融合されたロケーション APIを介してロケーションを取得しようとしています。アプリ全体で使用できるように、ヘルパー クラスを構築しようとしました。
コード：
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 android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
public class GPSTracker2 implements ConnectionCallbacks,
OnConnectionFailedListener,LocationListener {
// LogCat tag
private static final String TAG = GPSTracker2.class.getSimpleName();
private final static int PLAY_SERVICES_RESOLUTION_REQUEST = 1000;
private Location mLastLocation;
// Google client to interact with Google API
private GoogleApiClient mGoogleApiClient;
// boolean flag to toggle periodic location updates
private boolean mRequestingLocationUpdates = false;
private LocationRequest mLocationRequest;
// Location updates intervals in sec
private static int UPDATE_INTERVAL = 1000; // 10 sec
private static int FATEST_INTERVAL = 500; // 5 sec
private static int DISPLACEMENT = 10; // 10 meters
Context context;
// flag for GPS status
boolean canGetLocation = true;
double latitude,longitude;
public GPSTracker2(Context context) {
// TODO Auto-generated constructor stub
// First we need to check availability of play services
this.context=context;
createLocationRequest();
if (checkPlayServices()) {
// Building the GoogleApi client
buildGoogleApiClient();
}
if (mGoogleApiClient != null) {
mGoogleApiClient.connect();
}
// Show location button click listener
}
/**
* Method to display the location on UI
* */
/*private void displayLocation() {
mLastLocation = LocationServices.FusedLocationApi
.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
double latitude = mLastLocation.getLatitude();
double longitude = mLastLocation.getLongitude();
} else {
}
}*/
/**
* Method to display the location on UI
* */
private void displayLocation() {
mLastLocation = LocationServices.FusedLocationApi
.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
double latitude = mLastLocation.getLatitude();
double longitude = mLastLocation.getLongitude();
Toast.makeText(context,latitude+" "+longitude,Toast.LENGTH_LONG).show();
} else {
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
mLastLocation = LocationServices.FusedLocationApi
.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
this.canGetLocation = true;
double latitude = mLastLocation.getLatitude();
System.out.println("In GetLat==>"+latitude);
return latitude;
}else{
System.out.println("last known null");
return 0.0;
}
}
/**
* Function to get longitude
* */
public double getLongitude(){
mLastLocation = LocationServices.FusedLocationApi
.getLastLocation(mGoogleApiClient);
if (mLastLocation != null) {
this.canGetLocation = true;
longitude = mLastLocation.getLongitude();
System.out.println("In Getlong==>"+longitude);
}
return longitude;
}
/**
* Creating google api client object
* */
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(context)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();
}
/**
* Method to verify google play services on the device
* */
private boolean checkPlayServices() {
int resultCode = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(context);
if (resultCode != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
GooglePlayServicesUtil.getErrorDialog(resultCode, (Activity) context,
PLAY_SERVICES_RESOLUTION_REQUEST).show();
} else {
Toast.makeText(context,
"context device is not supported.", Toast.LENGTH_LONG)
.show();
//finish();
}
return false;
}
return true;
}
/**
* Creating location request object
* */
protected void createLocationRequest() {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FATEST_INTERVAL);
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
mLocationRequest.setSmallestDisplacement(DISPLACEMENT);
}
/**
* Starting the location updates
* */
protected void startLocationUpdates() {
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
}
/**
* Stopping location updates
*/
protected void stopLocationUpdates() {
LocationServices.FusedLocationApi.removeLocationUpdates(
mGoogleApiClient, this);
}
/**
* Google api callback methods
*/
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = "
+ result.getErrorCode());
}
@Override
public void onConnected(Bundle arg0) {
// Once connected with google api, get the location
// displayLocation();
//getLatitude();
//getLongitude();
displayLocation();
System.out.println("On Connected");
if (mRequestingLocationUpdates) {
startLocationUpdates();
}
}
@Override
public void onConnectionSuspended(int arg0) {
mGoogleApiClient.connect();
}
@Override
public void onLocationChanged(Location location) {
// Assign the new location
mLastLocation = location;
Toast.makeText(context, "Location changed!",
Toast.LENGTH_SHORT).show();
displayLocation();
// Displaying the new location on UI
// displayLocation();
// getLatitude();
// getLongitude();
}
/**
* Function to check GPS/wifi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
}
私はこれを次のように使用しようとしています:
CallingClass.java _
GPSTracker2 gps=new GPSTracker2(SettingsActivity.this);
if(gps.canGetLocation())
{
System.out.println("lat-->"+gps.getLatitude()+" long===>"+gps.getLongitude());
}else{
showSettingsAlert(true);
}
問題: メソッドgps.getLatitude()およびgps.getLongitude()は0.0を返します。ただし、トースト メッセージ ( displayLocation(); メソッド内) では、緯度と経度が完全に取得されます。
したがって、アプリケーションをデバッグしたところ、GpsTracker2 クラスのコンストラクターを呼び出した後、制御が呼び出し元のクラスに戻り、呼び出し元のクラスの onCreate を終了した後、GoogleApiclient が接続されていることがわかりました。呼び出しクラスのonCreate() 、したがって結果。
どうすればこの問題を克服できますか??