Run Lollipop version apps to lower version apps such as API 8? - android-studio

Question

I am very new to Android Studio! I have done phone contacts with the help of card views. I could be able to see output on Emulator (version 21) which I have run app on 21. But now I just need to run lolipop (API 21) version apps on lower version devices like (API 8).
If it runs then can be able to download APK to lower version devices which supports only API 8. The material design and themes should not be changed like I have on API 21. I have added cardView and recycler view libraries to support. Do I need to change or add any other things?
In Build.gradle,
apply plugin: 'com.android.application'
android {
compileSdkVersion 21
buildToolsVersion "20.0.0"
defaultConfig {
applicationId "com.example.meenar.meen_app3"
minSdkVersion 19
targetSdkVersion 21
versionCode 1
versionName "1.0"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:cardview-v7:21.0.+'
compile 'com.android.support:recyclerview-v7:21.0.+'
}
In Android Manifest.xml,
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.meenar.meen_app3"
xmlns:tools="http://schemas.android.com/tools">
<uses-sdk
tools:node="replace" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MyActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Card1Activity">
</activity>
<activity
android:name=".Card2Activity">
</activity>
<activity
android:name=".Card3Activity">
</activity>
<activity
android:name=".Card4Activity">
</activity>
<activity
android:name=".Card5Activity">
</activity>
</application>
In Styles.xml, ie. values-v21 :
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="AppTheme" parent="android:Theme.Material">
</style>
</resources>
When I run on API 21 version, it has material design effects - Checkboxes and radiobuttons of cardview: