我遇到了片段问题.我想在我的应用程序中添加一个抽屉菜单,而不是使用片段.我有这段代码,当我把片段“ findviewbyid”放不下时.有人可以帮我吗？

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fragment_contact);



    final EditText nome        = (EditText) findViewById(R.id.nome);
    final EditText citta       = (EditText) findViewById(R.id.citta);
    final EditText numero      = (EditText) findViewById(R.id.numero);
    final EditText email       = (EditText) findViewById(R.id.email);
    final EditText oggetto     = (EditText) findViewById(R.id.oggetto);
    final EditText messaggio    = (EditText) findViewById(R.id.messaggio);



    Button email = (Button) findViewById(R.id.post_message);
    email.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            String name      = nome.getText().toString();
            String citta     = citta.getText().toString();
            String numero    = numero.getText().toString();
            String email     = mail.getText().toString();
            String oggetto   = oggetto.getText().toString();
            String messaggio   = messaggio.getText().toString();
            if (TextUtils.isEmpty(nome)){
                nome.setError("Inserisci il Tuo Nome");
                nome.requestFocus();
                return;
            }

谢谢你,抱歉我的英语

解决方法:

片段不是活动,这意味着您不能使用活动方法或其生命周期.这意味着您无法在Fragment的onCreate()方法中找到视图,也不能在其上使用findViewById.

这是Android生命周期https://*.com/a/36340059/4467208

并据此调整代码,将findViews移到onCreateView()中,如下所示

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragmentLayout, container, false);
    nome = (EditText) view.findViewById(R.id.nome);
    return view;
}

等等.