java - 如何从自定义对话框中获取数据并在 recyclerview 中创建一个新项目？

Question

我需要单击 fab，自定义对话框将被调用。那么，如何从对话框(DialogFragment)获取数据并在具有此数据的recyclerview 中创建一个新项目？

已编辑:现在我有 NullPointerException。代码在这里:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    recyclerView = findViewById(R.id.recyclerView);
    adapter = new UserAdapter(users, this);

    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    recyclerView.setAdapter(adapter);

    FloatingActionButton fab = findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            createDialog();
        }
    });
}

public void createDialog(){
    View view = LayoutInflater.from(this).inflate(R.layout.dialog_user, null, false);
    final EditText username = view.findViewById(R.id.username);
    final EditText pass = view.findViewById(R.id.password);
    final AlertDialog.Builder builder = new AlertDialog.Builder(this)
            .setTitle("Title")
            .setView(view)
            .setPositiveButton("Add", null)
            .setNegativeButton("Cancel", null)
            .setCancelable(false);

    final AlertDialog dialog = builder.create();
    dialog.show();

    dialog.getButton(DialogInterface.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
                //update RecyclerView
                users.add(new User(username.toString(), pass.toString()));
                dialog.dismiss();
        }
    });
}

Answer 1

您可以使用简单的 AlertDialog 和 RecyclerView 来实现这一点。谢谢

View view = LayoutInflater.from(this).inflate(R.layout.edit_layout, null, false);
            final EditText editText = view.findViewById(R.id.editText);
            AlertDialog.Builder builder = new AlertDialog.Builder(this)
                    .setTitle("Title")
                    .setView(view)
                    .setPositiveButton("Add", null)
                    .setNegativeButton("Cancel", null)
                    .setCancelable(false);

            AlertDialog dialog = builder.create();
            dialog.show();

            dialog.getButton(DialogInterface.BUTTON_POSITIVE).setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //fdgdf
                    if(!TextUtils.isEmpty(editText.getText())) {
                        //update RecyclerView
                        dialog.dismis();
                    } else {
                       //Toast to show empty
                    }
                }
            });

R.layout.edit_layout 包含 ID 为 editText 的 EditText