在我的应用中，我需要用户位置。
我意识到我必须要求许可，但我如何在Android 5.1.1上执行此操作，用户无法更改权限。我编写的代码无处不在但没有结果。
我该怎样进行？
"com.quantcast" % "quantserve_shared" % "3.5.3166" % "compile->master"import android.content.pm.PackageManager;
import android.location.Location;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.Manifest;
//import com.google.android.gms.common.GooglePlayServicesClient;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.*;
//import com.google.android.gms.maps.model.LatLng;
//import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
//import com.google.android.gms.common.api.*;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback
, GoogleApiClient.ConnectionCallbacks
//, OnConnectionFailedListener
{
private GoogleMap mMap;
// public GoogleApiClient.Builder mGoogleApiClient = new GoogleApiClient.Builder(this);
private GoogleApiClient mGoogleApiClient;
public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
public double latitude;
public double longitude;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//mMainActivity.onConnected(bBundle);
Log.d("OnCreate", "enter 1");
mGoogleApiClient = new GoogleApiClient.Builder(this)
//.enableAutoManage(this /* FragmentActivity */,
// this /* OnConnectionFailedListener */)
.addConnectionCallbacks(this)
.addApi(LocationServices.API)
// .addApi(Places.GEO_DATA_API)
//.addApi(Places.PLACE_DETECTION_API)
.build()
;
mGoogleApiClient.connect();
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
Log.d("OnCreate", "enter in if1 ");
if (ActivityCompat.shouldShowRequestPermissionRationale(this,
Manifest.permission.ACCESS_FINE_LOCATION)) {
Log.d("OnCreate", "enter in if2 ");
} else {
Log.d("OnCreate", "enter in else2 Request permission ");
// No explanation needed, we can request the permission.
ActivityCompat.requestPermissions(this,
new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
MY_PERMISSIONS_REQUEST_LOCATION);
// MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
// app-defined int constant. The callback method gets the
// result of the request.
}
} else {
//Request location updates: Popytka
//locationManager.requestLocationUpdates(provider, 400, 1, this);
Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
Log.d("OnCreate", "enter mLastLocation " + String.valueOf(mLastLocation));
if (mLastLocation != null) {
Log.d("OnCreate", "enter2");
latitude = mLastLocation.getLatitude();
longitude = mLastLocation.getLongitude();
Log.d("OnCreate longitude", String.valueOf(longitude));
}
}
}
//public MainActivity mMainActivity = new MainActivity();
Bundle bBundle;
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case MY_PERMISSIONS_REQUEST_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
// location-related task you need to do.
if (ContextCompat.checkSelfPermission(this,
android.Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
//Request location updates:
//locationManager.requestLocationUpdates(provider, 400, 1, this);
Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
Log.d("OnCreate", "enter mLastLocation " + String.valueOf(mLastLocation));
if (mLastLocation != null) {
Log.d("OnCreate","enter20");
latitude = mLastLocation.getLatitude();
longitude = mLastLocation.getLongitude();
Log.d("OnCreate longitude-0", String.valueOf(longitude));
}
}
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
}
return;
}
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
//System.out.println("onMapReady in");
mMap = googleMap;
//latitude = -34;
//longitude = 151;
float zoom = 5;
double laRe = latitude, loRe = longitude+1;
// Add a marker in Sydney and move the camera
LatLng user = new LatLng(latitude, longitude), rest = new LatLng(laRe, loRe);
//LatLng rest = new LatLng(laRe, loRe);
mMap.addMarker(new MarkerOptions().position(user).title("Marker in USER"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(user, zoom));
mMap.addCircle(new CircleOptions()
.center(user)
.radius(200000)
.strokeColor(0)
.fillColor(0x4000ff00));
GroundOverlayOptions restPos = new GroundOverlayOptions()
.image(BitmapDescriptorFactory.fromResource(R.mipmap.ic_launcher))
.position(new LatLng(laRe, loRe), 200000f);
mMap.addGroundOverlay(restPos);
}
@Override
public void onConnected (Bundle bBundle){
}
protected void onStart() {
//mGoogleApiClient.connect();
super.onStart();
//mGoogleApiClient.ConnectionCallbacks; //(this);
}
protected void onStop() {
// mGoogleApiClient.disconnect();
super.onStop();
}
public void onConnectionSuspended(int i) {
}
//@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
}
SDK 25
答案 0 :(得分：0)
Android 6.0+需要运行时权限，但如果您需要这是请求运行时权限的最简单代码。
String [] permissions=new String[]{
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.ACCESS_FINE_LOCATION
};
List<String> listPermissionsNeeded = new ArrayList<>();
for (String permission:permissions) {
if (ContextCompat.checkSelfPermission(this,permission )!= PackageManager.PERMISSION_GRANTED){
listPermissionsNeeded.add(permission);
}
}
if (!listPermissionsNeeded.isEmpty()) {
ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]), 1);
}
更新
试试这个 - ＆gt;
首先，创建一个LocationRequest对象：
// Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(10 * 1000) // 10 seconds, in milliseconds
.setFastestInterval(1 * 1000); // 1 second, in milliseconds
然后，确保用户已授予使用位置的权限。如果是，请从requestLocationUpdates获取位置，如下所示：
void getLocation() {
Location location = null;
if (ContextCompat.checkSelfPermission(activity, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
/*TODO!! INSERT CODE TO PROMPT USER TO GIVE PERMISSION*/
} else {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
mLastLocation = location;
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient,this);
}
如果您只需要一个没有持续监控的位置，请务必删除更新。这样，您将永远不会获得null位置。