Switch

Layout

<Switch
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/my_switch"
        android:text="turn on or off"
        android:onClick="onSwitchClick" android:layout_margin="8dp

Java

public void onSwitchClick(View view) {
    Switch aSwitch = findViewById(R.id.my_switch);
    aSwitch.setOnCheckedChangeListener(new
                                               CompoundButton.OnCheckedChangeListener() {
                                                   public void onCheckedChanged(CompoundButton buttonView,
                                                                                boolean isChecked) {
                                                       StringBuffer onOff = new StringBuffer().append("On or off? ");
                                                       if (isChecked) { // The switch is enabled
                                                           onOff.append("ON ");
                                                       } else { // The switch is disabled
                                                           onOff.append("OFF ");
                                                       }
                                                       Toast.makeText(getApplicationContext(), onOff.toString(),
                                                               Toast.LENGTH_SHORT).show();
                                                   }
                                               });
}