Page 250 - MDP2020-1

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public void onBackPressed() {
if (System.currentTimeMillis() > backKeyPressedTime + 2000) {
backKeyPressedTime = System.currentTimeMillis();
showGuide();

return;
}
if (System.currentTimeMillis() <= backKeyPressedTime + 2000) {
activity.moveTaskToBack(true);

activity.finish();
android.os.Process.killProcess(android.os.Process.myPid());
toast.cancel();
}
}

public void showGuide() {
toast = Toast.makeText(activity, "\'뒤로\'버튼을 한번 더 누르시면 종료됩니다.",
Toast.LENGTH_SHORT);
toast.show();

}
}

<로그인 화면>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#fdded9"

android:gravity="center"
android:orientation="vertical"
android:padding="10dp" >

<LinearLayout

android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:orientation="vertical"
android:paddingLeft="20dp"

android:paddingRight="20dp">