Androidで、アクティビティではなく、アプリケーションレベルの再起動を行う。

AndroidApplicationRestart.java

final Intent i = new Intent(getApplicationContext(), ContentActivity.class);
final PendingIntent appStarter = PendingIntent.getActivity(getApplicationContext(), 0, i, 0);

final AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 5000, appStarter);

Process.killProcess(Process.myPid());