小编Sag*_*tti的帖子

无法解析以下facebook导入的符号.

    import com.facebook.Request;
        import com.facebook.Response;
        import com.facebook.Session;
        import com.facebook.model.GraphUser;
import com.parse.ParseQueryAdapter;

这些是我正在使用的gradle依赖项

compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.parse.bolts:bolts-tasks:1.3.0'
    compile 'com.parse:parse-android:1.11.0'
    compile 'com.parse:parseui-widget-android:0.0.1'
    compile 'com.parse:parseui-login-android:0.0.1'
    compile 'com.parse:parsefacebookutils-v4-android:1.10.4@aar'
    compile 'com.facebook.android:facebook-android-sdk:4.+' 

我收到以下运行时错误：java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法“double android.location.Location.getLatitude()”

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.widget.ListView;

import com.parse.ParseException;
import com.parse.ParseFile;
import com.parse.ParseGeoPoint;
import com.parse.ParseObject;
import com.parse.ParseQuery;

import java.util.ArrayList;
import java.util.List;


public class MainActivity extends Activity {
    // Declare Variables
    ListView listview;
    List<ParseObject> ob;
    ProgressDialog mProgressDialog;
    ListViewAdapter adapter;
    Context context;
    private List<PlaceFilter> worldpopulationlist = null;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Get the view from listview_main.xml
        setContentView(R.layout.activity_main);
        // Execute …