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似たような質問やブログがたくさんありますが、私の問題解決に役立つものはありません。私は以下のコードを書いていますが、getLastKnowLocationで返された場所はnullです。それは時々大丈夫です。getLastKnowLocationはいくつかの条件でnullを返すことがあります。私のコードでは、getLastKnowLocationメソッドがnullを返すが、onLocationChangedメソッドが呼び出されない場合、私は新しい更新された場所を要求した。 ここにコードがあります。Fused Location Provider：getLastKnowLocationがnullを返していて、onLocationChangeが呼び出されていませんか？
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location_provider_layout);
Intent intent = getIntent();
checkPlayServices();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
mGoogleApiClient.connect();
mLocationRequest= LocationRequest.create()
.setInterval(10000)
.setFastestInterval(5000)
.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
}
private boolean checkPlayServices() {
GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
int resultCode = apiAvailability.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (apiAvailability.isUserResolvableError(resultCode)) {
apiAvailability.getErrorDialog(this, resultCode, PLAY_SERVICES_RESOLUTION_REQUEST)
.show();
} else
finish();
return false;
}
return true;
}
@Override
public void onConnected(@Nullable Bundle bundle) {
if (mGoogleApiClient.isConnected())
Log.d(LOCATION_TAG, "Google api is connected");
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(mLocationRequest);
PendingResult<LocationSettingsResult> result = LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(@NonNull LocationSettingsResult locationSettingsResult) {
final Status status = locationSettingsResult.getStatus();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:;
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
boolean isLocationOn = ActivityCompat.checkSelfPermission(LocationProviderClass.this, Manifest.permission_group.LOCATION) != PackageManager.PERMISSION_GRANTED;
if (!(isLocationOn)) {
String [] runTimePermission=new String[]{Manifest.permission_group.SMS};
requestPermissions(runTimePermission, LOCATION_REQUESTCODE);
}
else
computeLocation();
} else
computeLocation();
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
try {
status.startResolutionForResult(LocationProviderClass.this, STATUS_INT);
} catch (IntentSender.SendIntentException e) {
Log.d(LOCATION_TAG, "error in startResolutionForResult");
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
Log.d(LOCATION_TAG, "Location setting is canceled");
break;
default:
Log.d(LOCATION_TAG,"Location setting enters into default");
}
}
});
computeLocation();
}
@Override
public void onConnectionSuspended(int i) {
Log.d("PERMISSION_TAG","connection suspended");
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
if (!mGoogleApiClient.isConnected())
Log.d(PERMISSION_TAG, "ON connection failed error");
if (connectionResult.hasResolution()) {
try {
// Start an Activity that tries to resolve the error
connectionResult.startResolutionForResult(this, CONNECTION_FAILURE_RESOLUTION_REQUEST);
} catch (IntentSender.SendIntentException e) {
e.printStackTrace();
}
} else {
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
private void computeLocation() {
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
Toast.makeText(getApplicationContext(), "Fine access location is not granted", Toast.LENGTH_LONG).show();
}
}
location=LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if(location==null) {
Toast.makeText(getApplicationContext(), "getLastLocation return null", Toast.LENGTH_LONG).show();
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
else {
Toast.makeText(getApplicationContext(), "getLastLocation return"+location.getLatitude()+" "+location.getLongitude(), Toast.LENGTH_LONG).show();
//do what ever you want here
}
}
@RequiresApi(api = Build.VERSION_CODES.M)
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
switch (requestCode) {
case LOCATION_REQUESTCODE: {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
computeLocation();
}
else {
Log.d(RUNTIME_PERMISSION_ERROR,"Error in runtime error");
Toast.makeText(getApplication(),"The app need location permission", Toast.LENGTH_LONG).show();
}
break;
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == STATUS_INT) {
switch (resultCode) {
case Activity.RESULT_OK: {
Toast.makeText(getApplicationContext(), "User enabled location permission", Toast.LENGTH_LONG).show();
computeLocation();
break;
}
case Activity.RESULT_CANCELED: {
Toast.makeText(getApplication(), "You canceled the permission the app is not going to work", Toast.LENGTH_LONG).show();
break;
}
default:
Toast.makeText(getApplication(), "Permission error", Toast.LENGTH_LONG).show();
}
}
}
@Override
public void onLocationChanged(Location location) {
Log.d(LOCATION_TAG, "onLocationChanged method called");
Toast.makeText(getApplicationContext(), "onLocationChanged method called"+location.getLongitude()+" "+location.getLatitude(), Toast.LENGTH_LONG).show();
}
@Override
public void onStart() {
super.onStart();
}
@Override
protected void onResume()
{
super.onResume();
this.mGoogleApiClient.connect();
}
@Override
public void onPause() {
super.onPause();
if (this.mGoogleApiClient.isConnected())
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);
this.mGoogleApiClient.disconnect();
}
}
私はLocationManagerではなくGoogle Playサービス（融合ロケーションプロバイダ）を求めています。 – Yirga