title: Android Studio "can't resolove symbol 'Theme'"
body: <p>I'm using android studio 0.8.4
  when I extend <code>@style/Theme.AppCompat.Light</code>, android studio says <code>can't resolove symbol 'Theme'</code> with red font colored <code>Theme</code>. but when I run this project, it runs well. I can't know how to solve this problem. belows are my codes.</p>
  
  <p>styles.xml</p>
  
  <pre><code>&lt;resources&gt;
      &lt;!-- the theme applied to the application or activity --&gt;
      &lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
      &lt;/style&gt;
  &lt;/resources&gt;
  </code></pre>
  
  <p>build.gradle</p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 20
      buildToolsVersion "20.0.0"
  
      defaultConfig {
          applicationId "kr.co.hiworks.office"
          minSdkVersion 9
          targetSdkVersion 19
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              runProguard false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  
      lintOptions {
          disable 'InvalidPackage'
      }
  
      packagingOptions {
          exclude 'META-INF/services/javax.annotation.processing.Processor'
      }
  
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      compile 'com.android.support:support-v4:19.+'
      compile 'com.android.support:appcompat-v7:19.+'
      compile 'com.jakewharton:butterknife:5.1.1'
      compile 'com.nineoldandroids:library:2.4.0'
      compile 'com.mcxiaoke.volley:library:1.0.6'
      compile 'com.github.satyan:sugar:1.3'
  }
  </code></pre>
  
  <p>AndroidManifest.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="kr.co.hiworks.office" &gt;
  
      &lt;application
          android:name=".BaseApplication"
          android:allowBackup="true"
          android:icon="@drawable/ic_launcher"
          android:label="@string/app_name"
          android:theme="@style/AppTheme" &gt;
          &lt;meta-data android:name="DATABASE" android:value="hiworks_office.db" /&gt;
          &lt;meta-data android:name="VERSION" android:value="1" /&gt;
          &lt;meta-data android:name="QUERY_LOG" android:value="true" /&gt;
          &lt;meta-data android:name="DOMAIN_PACKAGE_NAME" android:value="kr.hiworks.office.models" /&gt;
          &lt;activity
              android:name=".activities.MainActivity"
              android:label="@string/app_name" &gt;
              &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>