小编B. *_*Bob的帖子

我正在尝试检查用户是否启用了android.Manifest.permission.ACCESS_FINE_LOCATION.运行应用程序时,出现NullPointerException错误.

包dtt.romano.rsrpechhulp;

import android.app.Activity;
import android.content.Context;
import android.content.IntentSender;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.util.Log;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

public class LocationProvider extends MainActivity implements
    GoogleApiClient.ConnectionCallbacks,
    GoogleApiClient.OnConnectionFailedListener,LocationListener {

public abstract interface LocationCallback {
    public void handleNewLocation(Location location);
}

public static final String TAG = LocationProvider.class.getSimpleName();
private final static int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;

private LocationCallback mLocationCallback;
private Context mContext;
private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;

public LocationProvider(Context context, LocationCallback callback) …