这是我的MapsActivity.java文件，我已经使用了RequestPermission回调和一切但是对话框要求我授予位置权限不会显示并且应用程序崩溃！ 包saksham.geofencing;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mGeofences = new ArrayList<Geofence>();
mGeofenceCoordinates = new ArrayList<LatLng>();
// double string0=prefenceSettings.getString("LatLng0", "34");
setContentView(R.layout.activity_maps);
showHelpForFirstLaunch();
SupportMapFragment supportMapFragment =
(SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.googleMap);
cd = new ConnectionDetector(getApplicationContext());
isInternetPresent = cd.isConnectingToInternet();
// check for Internet status
if (isInternetPresent) {
// Internet Connection is Present
// make HTTP requests
} else {
// Internet connection is not present
// Ask user to connect to Internet
showAlertDialog(MapsActivity.this, "No Internet Connection",
"You don't have internet connection.");
}
/**
* SupportMapFragment belongs to the v4 support library, contrary to the default MagFragment that is a native component in Android.
SupportMapFragment will support more Android versions, but it is also an additional library you have to add in your project,
so I think it really depends on the Android versions you are targeting:
• On recent versions, the default components should be enough
• On older versions you will need to install the v4 support library and maybe others
*
*/
db = openOrCreateDatabase("geofence", Context.MODE_PRIVATE, null);
db.execSQL("CREATE TABLE IF NOT EXISTS Coordinates(id INTEGER,latitude DOUBLE,longitude DOUBLE,true VARCHAR);");
db.execSQL("INSERT INTO Coordinates VALUES(0,0,0,'0')");
db.execSQL("INSERT INTO Coordinates VALUES(1,0,0,'0')");
db.execSQL("INSERT INTO Coordinates VALUES(2,0,0,'0')");
googleMap = supportMapFragment.getMap();
Log.i("My activity", "maps=" + googleMap);
googleMap.setMyLocationEnabled(true);
/**
* setMyLocationEnabled(true/false) shows the true location when the GPS is switched on from the device. It is an inbuilt feature of the googlemaps .
*/
LocationManager locationManager = (LocationManager) getSystemService(Service.LOCATION_SERVICE);
// getting GPS status
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if(!isGPSEnabled)
{
Utils.displayPromptForEnablingGPS(this);
}
Log.i("My activity", "gps is" + isGPSEnabled);
// getting network status
boolean isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
Log.i("My activity", "network is" + isNetworkEnabled);
Criteria crta = new Criteria();
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.GINGERBREAD) {
crta.setAccuracy(Criteria.ACCURACY_FINE);
} else {
crta.setAccuracy(Criteria.ACCURACY_MEDIUM);
}
/**
* we have used .setAccuracy as fine for higher SDks than gingerbread .Gingerbread is used as a reference because in apks lower
* than gingerbread there is very poor geo-fencing, with gingerbread google made it a lot easier for location services to be used for devleopers.
* it had improved set of tools for Location Services, which included geofencing and substantially improved location discovery.
*/
crta.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(crta, true);
/**
* It request Location updates after every 5 sec or if the user traveled 10m
*/
Log.i("My activity", "manager is " + locationManager);
Log.i("My activity", "provider is " + provider);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
MapsActivity.this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.ACCESS_COARSE_LOCATION}, 100);
return;
}
}
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks((GoogleApiClient.ConnectionCallbacks) this)
.addOnConnectionFailedListener((GoogleApiClient.OnConnectionFailedListener) this)
.addApi(LocationServices.API)
.build();
mGoogleApiClient.connect();
Log.i("Api is", "" + mGoogleApiClient);
}
mLocationRequest = new LocationRequest();
// We want a location update every 10 seconds.
mLocationRequest.setInterval(10000);
// We want the location to be as accurate as possible.
mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
insertgeofence();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case 100: {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "Thanks for the permission", Toast.LENGTH_LONG).show();
// permission was granted, yay! do the
// calendar task you need to do.
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(this, "You did not allow to access your current location", Toast.LENGTH_LONG).show();
}
}
// other 'switch' lines to check for other
// permissions this app might request
}
}
@Override
public void onLocationChanged(Location location) {
latitude=location.getLatitude();
longitude=location.getLongitude();
CameraPosition INIT =
new CameraPosition.Builder()
.target(new LatLng(latitude, longitude))
.zoom(17.5F)
.bearing(300F) // orientation
.tilt(50F) // viewing angle
.build();
// use GooggleMap mMap to move camera into position
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(INIT));
}
@Override
public void onConnected(Bundle bundle) {
Location mlastlocation;
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
MapsActivity.this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION,Manifest.permission.WRITE_EXTERNAL_STORAGE}, 100);
return;
}
}
mlastlocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
startLocationUpdates();
if (mlastlocation != null) {
Log.i("the last location:", "" + mlastlocation);
// Toast.makeText(this, "Get last location first asshole!", Toast.LENGTH_LONG).show();
}
}
protected void startLocationUpdates() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
MapsActivity.this.requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 100);
return;
}
LocationRequest mLocationRequest = new LocationRequest();
LocationServices.FusedLocationApi.requestLocationUpdates(
mGoogleApiClient, mLocationRequest, this);
}
}
}
答案 0 :(得分：0)
在检查权限之前，您正在调用googleMap.setMyLocationEnabled(true)。此外，您应该在检查权限后实例化任何位置代码。另外，在onRequestPermissionsResult中，您可能希望添加要发起的位置代码。