[WebView] 뒤로가기 버튼 & 종료버튼

@Override
public void onBackPressed() {
    if(wb.getUrl().equals("메인페이지 주소 || 종료시킬 페이지")) {
        if (System.currentTimeMillis() > backKeyPressedTime + 2000) {
            Toast.makeText(getApplicationContext(), "finish?",
                    Toast.LENGTH_SHORT).show();
            backKeyPressedTime = System.currentTimeMillis();
            return;
        } else if (System.currentTimeMillis() <= backKeyPressedTime + 2000) {
            moveTaskToBack(true);
            finish();
            android.os.Process.killProcess(android.os.Process.myPid());
        }
    }


    wb.goBack();
}