make your android app boot at device start-up http://dostmuhammad.com/blog/make-your-android-app-boot-at-device-start-up

BootUpReceiver.java

public class BootUpReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
                Intent i = new Intent(context, MyActivity.class);  
                i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(i);  
        }
}