In android, switch is the toggle widget that has two states to select two options.

User can simply click to toggle or drag back and forth to select the option.

Here, I am changing the ON color of the SwitchCompat. SwitchCompat is the version of Switch provided in V7.

I apply a custom theme to the SwitchCompat through theme property

  android:theme="@style/Theme.ToogleTheme"

Below is the code:

<android.support.v7.widget.SwitchCompat
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="right"
    android:theme="@style/Theme.ToogleTheme"
    android:layout_marginTop="5dp"
    />

  <style name="Theme.ToogleTheme" parent="Theme.AppCompat.Light">
        <!-- colorPrimary is used for the default action bar background -->
        <item name="colorPrimary">@color/colorPrimary</item>

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

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

        <!-- You can also set colorControlNormal, colorControlActivated
             colorControlHighlight, and colorSwitchThumbNormal. -->

    </style>