How to have a Lollipop switch button

To have the Lollipop style switch button on older versions of android you should use SwitchCompat in layout xml file

<android.support.v7.widget.SwitchCompat
        android:id="@+id/compatSwitch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

and also in java file

SwitchCompat switchCompat = (SwitchCompat) findViewById(R.id.compatSwitch);

At first set android:targetSdkVersion="22" in your manifest to make your app compatible to Lollipop.

NOTE: Color of your switch depends on this

<item name="android:colorAccent">@color/accent</item>

Create your own theme for your app in styles.xml in Folder values-v21

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="AppTheme.Base">
        <item name="android:colorPrimary">@color/primary</item>
        <item name="android:colorPrimaryDark">@color/primary_dark</item>
        <item name="android:colorAccent">@color/accent</item>
        <item name="android:textColorPrimary">@color/text_primary</item>
        <item name="android:textColor">@color/text_secondary</item>
        <item name="android:navigationBarColor">@color/primary_dark</item>
        <item name="toolbarStyle">@style/Widget.AppCompat.Toolbar</item>
    </style>
</resources>

styles.xml in default Folder values or values-v14

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="AppTheme.Base">
        <!-- Customize your theme here. -->

        <item name="toolbarStyle">@style/Widget.AppCompat.Toolbar</item>
    </style>

    <style name="AppTheme.Base" parent="Theme.AppCompat">
        <!-- Customize your theme here. -->

        <!-- colorPrimary is used for the default action bar background -->
        <item name="colorPrimary">@color/primary</item>

        <!-- colorPrimaryDark is used for the status bar -->
        <item name="colorPrimaryDark">@color/primary_dark</item>

        <!-- colorAccent is used as the default value for colorControlActivated
             which is used to tint widgets -->
        <item name="colorAccent">@color/accent</item>

        <!-- You can also set colorControlNormal, colorControlActivated
             colorControlHighlight & colorSwitchThumbNormal. -->
    </style>

</resources>