R變量出錯

我在R變量上收到錯誤。變量是R.id.drawer_layout，R.id.layout和R.id.main。 id之後的單詞下面有一條紅色的波浪線。這些都是來自R的錯誤。我的佈局有什麼問題嗎？我剛剛開始android編程，這是來自github。R變量出錯

http://manishkpr.webheavens.com/android-navigation-drawer-example-using-fragments/ ^這是教程和代碼的來源。

package com.anshikka.datagushalpha; 

import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.widget.DrawerLayout; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

public class MainActivity extends FragmentActivity { 
    final String[] data ={"one","two","three"}; 
    final String[] fragments ={ 
      "com.anshikka.datagushalpha.FragmentOne", 
      "com.anshikka.datagushalpha.FragmentTwo", 
      "com.anshikka.datagushalpha.FragmentThree"}; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     @SuppressWarnings({ "unchecked", "rawtypes" }) 
     ArrayAdapter adapter = new ArrayAdapter(getActionBar().getThemedContext(), android.R.layout.simple_list_item_1, data); 

    final DrawerLayout drawer = (DrawerLayout)findViewById(R.id.drawer_layout); 
    final ListView navList = (ListView) findViewById(R.id.drawer); 
    navList.setAdapter(adapter); 
    navList.setOnItemClickListener(new OnItemClickListener(){ 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, final int pos,long id){ 
        drawer.setDrawerListener(new DrawerLayout.SimpleDrawerListener(){ 
          @Override 
          public void onDrawerClosed(View drawerView){ 
            super.onDrawerClosed(drawerView); 
            FragmentTransaction tx = getSupportFragmentManager().beginTransaction(); 
            tx.replace(R.id.main, Fragment.instantiate(MainActivity.this, fragments[pos])); 
            tx.commit(); 
          } 
        }); 
        drawer.closeDrawer(navList); 
      } 
    }); 
    FragmentTransaction tx = getSupportFragmentManager().beginTransaction(); 
    tx.replace(R.id.main,Fragment.instantiate(MainActivity.this, fragments[0])); 
    tx.commit(); 
} 

}

來源

2014-02-24 user3238863

嘗試導入您的R 在導入時添加此 import com.anshikka.R – soynerdito