title: Error R.id && Theme.AppCompat.Light when i make Action
body: <p>When i Edited 
  it's still error when i edit finish .this is my code MainActivity</p>
  
  <pre><code>package com.example.actionbar;
  
   import android.os.Bundle;
   import android.app.Activity;
   import android.view.Menu;
   import android.view.MenuItem;
   import android.widget.Toast;
  
  public class MainActivity extends Activity {
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      getActionBar().setDisplayHomeAsUpEnabled(true);
  }
  
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
  }
  //ถ้ามีการเลือก actionเกิดขึ้น object ที่นำมาใช้จะเรียกชื่อobject นี้ว่า onOptionItemSelected()
  public boolean onOptionItemSelect(MenuItem item){
      //ใช้switch case ในการกำหนดว่าเมือ เลือก action นี้เเล้วทำอะไร
      switch (item.getItemId()){
          case R.id.action_search:
              Toast.makeText(this,"Menu search is selected", Toast.LENGTH_SHORT).show();
          break;
          case R.id.action_settings:
              Toast.makeText(this,"Menu setting is selected", Toast.LENGTH_SHORT).show();
          break;
      default:
          break;
      }
      return true;    
  }
  
  }
  </code></pre>
  
  <p>Now i add string to string.xml </p>
  
  <pre><code>&lt;string name="action_search"&gt;Search&lt;/string&gt;
  </code></pre>
  
  <p>This is my code in res/menu/main</p>
  
  <pre><code>&lt;item
      android:id="@+id/action_search"
      android:icon="@drawable/ic_action_search"
      android:name="@string/action_search"
      android:showAsAction="ifRoom"/&gt;
  </code></pre>
  
  <p>This is my code at manifest error at (android:label="@string/Theme.AppCompat.Light") .</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.actionbar"
     android:versionCode="1"
     android:versionName="1.0" &gt;
  
  &lt;uses-sdk
      android:minSdkVersion="11"
      android:targetSdkVersion="18" /&gt;
  
  &lt;application
      android:allowBackup="true"
      android:icon="@drawable/ic_launcher"
      android:label="@string/app_name"
      android:theme="@style/AppTheme" &gt;
      &lt;activity
          android:name="com.example.actionbar.MainActivity"
          android:label="@string/Theme.AppCompat.Light" &gt;          &lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;&lt;error
          &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.MAIN" /&gt;
  
              &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
          &lt;/intent-filter&gt;
      &lt;/activity&gt;
  &lt;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>this my error in R &amp; Theme.AppCompat.Light. </p>
  
  <pre><code> R cannot be resolved to a variable
   No resource found that matches the given name (at 'label' with value   '@string/Theme.AppCompat.Light')
  </code></pre>
  
  <p>How can i do ??
  thank you</p>