Intento cambiar mi tema de holo de la aplicación HelloWorld por el tema Material.Light.DarkActionBar (como se dijo en la sesión Novedades de las herramientas de desarrollo de Android). Pero recibí el siguiente error. Intento cambiar la versión de destino del SDK es 21. Pero no teníamos 21 SDK en SDK Manager. En esa sesión, dijeron, establezca el estilo xml para v-21.

valores / styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>

</resources>

values-v21 / styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    !-- Base application theme. -->
    <style name="AppTheme" parent="android:Theme.Material.Light.DarkActionBar">
        <!-- Customize your theme here. -->
    </style>
</resources>

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 20
    buildToolsVersion "20.0.0"

    defaultConfig {
        applicationId "com.ramapps.helloworld"
        minSdkVersion 15
        targetSdkVersion 20
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
}

Error:

Error:Error retrieving parent for item: No resource found that matches the given name 'android:Theme.Material.Light.DarkActionBar'.
Error:Execution failed for task ':app:processDebugResources'.
> com.android.ide.common.internal.LoggedErrorException: Failed to run command:
    /Applications/Android Studio.app/sdk/build-tools/android-4.4W/aapt package -f --no-crunch -I /Applications/Android Studio.app/sdk/platforms/android-20/android.jar -M /Users/Ram_PC/Ram/MyDrive/My_Workspaces/Android_Studio_Workspace_L/HelloWorld/app/build/intermediates/manifests/debug/AndroidManifest.xml -S /Users/Ram_PC/Ram/MyDrive/My_Workspaces/Android_Studio_Workspace_L/HelloWorld/app/build/intermediates/res/debug -A /Users/Ram_PC/Ram/MyDrive/My_Workspaces/Android_Studio_Workspace_L/HelloWorld/app/build/intermediates/assets/debug -m -J /Users/Ram_PC/Ram/MyDrive/My_Workspaces/Android_Studio_Workspace_L/HelloWorld/app/build/generated/source/r/debug -F /Users/Ram_PC/Ram/MyDrive/My_Workspaces/Android_Studio_Workspace_L/HelloWorld/app/build/intermediates/libs/app-debug.ap_ --debug-mode --custom-package com.ramapps.helloworld -0 apk
  Error Code:
    1
  Output:
    /Users/Ram_PC/Ram/MyDrive/My_Workspaces/Android_Studio_Workspace_L/HelloWorld/app/build/intermediates/res/debug/values-v21/values.xml:7: error: Error retrieving parent for item: No resource found that matches the given name 'android:Theme.Material.Light.DarkActionBar'.