mMap.setMyLocationEnabled中的错误（true）;

Question

我在我的项目中将google maps api作为片段实现，但是在添加setmylocationenabled（true）时出现错误。请帮我解决一下这个。 错误是： - “调用需要权限，可能被用户拒绝。代码应明确检查权限是否可用（使用'checkPermission'）或显式处理潜在的'安全例外'

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

import com.testgmaps.R;

public class GmapFragment extends Fragment implements OnMapReadyCallback {


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_gmaps, container,false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        MapFragment fragment = (MapFragment)getChildFragmentManager().findFragmentById(R.id.map);
        fragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap mMap) {
        mMap.setMyLocationEnabled(true);
        LatLng marker = new LatLng(-33.867, 151.206);

        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(marker, 13));

        mMap.addMarker(new MarkerOptions().title("Google Maps Test Marker").position(marker));

    }
}