我正在处理我需要访问用户的gps位置的项目。由于android 6，我需要运行时权限。我试图这样做，第一次在活动开始时询问gps位置，但没有给我位置。我仍然没有得到任何位置坐标。希望有人可以帮忙吗？
public class benzinpriser_akt extends AppCompatActivity implements OnItemClickListener {
public static final int MY_PERMISSION_REQUEST_GPS_LOCATION = 1 ;
LocationManager locationManager;
LocationListener locationListener;
Location currentLocation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
currentLocation = location;
System.out.println("Current Location "+ currentLocation );
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
}
};
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
} else {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSION_REQUEST_GPS_LOCATION);
}
}
// Some other code regarding listview and fetching data from database
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSION_REQUEST_GPS_LOCATION: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
System.out.println("Permission Granted");
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
答案 0 :(得分：0)
首先将两条线添加到build.gradle：
compile 'com.google.android.gms:play-services-maps:8.4.0'
compile 'com.google.android.gms:play-services-location:8.4.0'
然后在你的活动中你必须这样实现：
public class benzinpriser_akt extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,LocationListener, android.location.LocationListener {
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
private int UPDATE_INTERVAL = 20000; // 20 sec
private int FASTEST_INTERVAL = 10000; // 10 sec
private int DISPLACEMENT = 50; // get location per 50 meter change
protected final String TAG = "Location Service";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(yourlayout);
//build google api client
buildGoogleApiClient();
} //oncreate end
protected synchronized void buildGoogleApiClient() {
Log.v(TAG, "google client building");
if (GooglePlayServicesUtil.isGooglePlayServicesAvailable(this) == ConnectionResult.SUCCESS) {
mGoogleApiClient = new GoogleApiClient.Builder(thisService)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API).build();
if (!mGoogleApiClient.isConnected() || !mGoogleApiClient.isConnecting()) {
mGoogleApiClient.connect();
}
startListenLocation();
} else {
Log.e(TAG, "unable to connect to google play services.");
}
}
public void createLocationRequestWithDialog(final Activity activity){
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
mLocationRequest.setInterval(UPDATE_INTERVAL);
mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
.addLocationRequest(mLocationRequest);
//**************************
builder.setAlwaysShow(true); //this is the key ingredient
//**************************
PendingResult<LocationSettingsResult> result =
LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
@Override
public void onResult(LocationSettingsResult result) {
final Status status = result.getStatus();
final LocationSettingsStates state = result.getLocationSettingsStates();
switch (status.getStatusCode()) {
case LocationSettingsStatusCodes.SUCCESS:
// All location settings are satisfied. The client can initialize location
// requests here.
break;
case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
// Location settings are not satisfied. But could be fixed by showing the user
// a dialog.
try {
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
status.startResolutionForResult(
activity, 1000);
} catch (IntentSender.SendIntentException e) {
// Ignore the error.
}
break;
case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
// Location settings are not satisfied. However, we have no way to fix the
// settings so we won't show the dialog.
break;
}
}
});
}
public void checkGpsPermission(Activity activity) {
if (ContextCompat.checkSelfPermission(activity, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSION_ACCESS_GPS);
}
else
{
createLocationRequestWithDialog(activity);
}
}
protected void startListenLocation() {
if (ActivityCompat.checkSelfPermission(thisService, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
//no permission , create a notification and want permission
NotificationManager notificationManager = (NotificationManager)
getSystemService(NOTIFICATION_SERVICE);
Notification n = new Notification.Builder(thisService)
.setContentTitle(" notification")
.setContentText("there is no permission about using gps services, please give location permissions")
.setSmallIcon(R.drawable.logo)
.setAutoCancel(true)
.build();
notificationManager.notify((int)System.currentTimeMillis(), n);
} else {
// permission has been granted, continue as usual
if(mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
if (mGoogleApiClient.isConnected() && mLastLocation != null) {
createLocationRequestWithDialog();
startListenLocation();
}
}
@Override
public void onConnectionSuspended(int i) {
mGoogleApiClient.connect();
}
//TODO add other override methods , onresume, onproviderenabled etc...
}//class end
电池耗尽：
/*
Priority update interval Battery drain per hour (%) Accuracy
HIGH_ACCURACY 5 seconds 7.25% ~10 meters
BALANCED_POWER 20 seconds 0.6% ~40 meters
NO_POWER N/A small ~1 mile
* /