Try following way,
public class Receiver extends BroadcastReceiver
{
public static final String TAG = "Receiver Tutorial";
private CountDownTimer countDownTimer;
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
countDownTimer = new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
}
};
if (action != null && Intent.ACTION_SCREEN_ON.equals(action)) {
Toast.makeText(context, "Screen is turned ON", Toast.LENGTH_LONG).show();
countDownTimer.start();
}
}
}