无法解析facebook likeView的符号

Question

package com.example.user.likebutton;

public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException{

    List<Customer> customerList = new ArrayList<>();
    List<Service> serviceList = new ArrayList<>();
    List<Product> productList = new ArrayList<>();
    List result = returnFunc();
    printList(result);

}


public static void printList(List genericList) throws ClassNotFoundException, InstantiationException, IllegalAccessException{
    Object obj=null;
    String type = "";
    Class c1 = null;
    // identify the type of list
    if(genericList.get(0) instanceof Customer){
        c1 = Class.forName("Customer");
    }else if(genericList.get(0) instanceof Service){
        c1 = Class.forName("Service");
    }else if(genericList.get(0) instanceof Product){
        c1 = Class.forName("Product");
    }else{
        System.out.println("Error");
    }
    // create the list object
    Object instance = c1.newInstance();
    // iterate over the list and print the values
    for(Object o : genericList){
        System.out.println(o.toString());

    }
}
//to randomly output a list
public static List returnFunc(){
    ArrayList<List> tmp = new ArrayList<>();
    ArrayList<Object> list_customer = new ArrayList<>();
    list_customer.add(new Customer());
    ArrayList<Object> list_service = new ArrayList<>();
    list_service.add(new Service());
    ArrayList<Object> list_product = new ArrayList<>();
    list_product.add(new Product());
    tmp.add(list_customer);
    tmp.add(list_service);
    tmp.add(list_product);
    Random r = new Random();
    return tmp.get(r.nextInt(3));
}

我无法解析

的符号

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;

import com.facebook.FacebookSdk;
import com.facebook.widget.LikeView;

public class MainActivity extends Activity {
    private static final String TAG = "FBLike";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // To initialize Facebook SDK in your app
        FacebookSdk.sdkInitialize(this);
        // Get LikeView button
        LikeView likeView = (LikeView) findViewById(R.id.like_view);
        // Set the object for which you want to get likes from your users (Photo, Link or even your FB Fan page)
        likeView.setObjectId("https://www.facebook.com/tomatojuice");
        // Set foreground color fpr Like count text
        likeView.setForegroundColor(-256);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        LikeView.handleOnActivityResult(this, requestCode, resultCode, data);
        Log.i(TAG, "OnActivityResult...");
    }
}

我似乎无法导入此文件 import com.facebook.widget.LikeView;

介意告诉我任何我忘记添加的东西？我已经将存储库mavenCentral（）置于存储库中并将facebook sdk编译为'com.facebook.android:facebook-android-sdk:4.6.0'以获取依赖