setOnSelectedListener 在 gridView 上不起作用

Question

我寻找了一些关于 onItemSelected 的答案，但我发现他们需要使用 onItemClick。

在我的应用程序中，我希望用户选择他在 gridView 上显示的姓名，然后单击 Enter，然后出现 alertDialog 以输入他的密码。

尝试了一些东西，但它对我不起作用，这是相关代码：

waiterList = new ArrayList<Waiter>();

    waiterList = dataBaseHelper.showWaiters();
    adapter = new MyAdapter(MainActivity.this, waiterList);

    gridView.setAdapter(adapter);
    gridView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

            waiter = waiterList.get(position);
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

以及调用按钮点击的函数：

public void Enter(View view) {

        if (gridView.isSelected()){

            LayoutInflater inflater = getLayoutInflater();
            View dialogLayout = inflater.inflate(R.layout.password_dialog, null);

            AlertDialog.Builder passwordDialog = new AlertDialog.Builder(MainActivity.this);
            passwordDialog.setTitle(getString(R.string.get_id_uniq));
            passwordDialog.setMessage(getString(R.string.enter_id));

            passwordDialog.setView(dialogLayout);

            passwordDialog.setPositiveButton(getString(R.string.next), new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    password = input.getText().toString();
                    if (password.equals(waiter.getPass())) {

                        startActivity(new Intent(getApplicationContext(), Activity_Zone.class));


                        Toast.makeText(getApplicationContext(),
                                "match", Toast.LENGTH_LONG).show();
                    } else {
                        Toast.makeText(getApplicationContext(),
                                "Wrong pass", Toast.LENGTH_LONG).show();
                    }
                }

            });

            passwordDialog.setNegativeButton(getString(R.string.cancel), new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            });

            AlertDialog dialog = passwordDialog.show();
            input = (EditText) dialog.findViewById(R.id.editText);


            }

        else {
            Toast.makeText(getApplicationContext(), "Waiter isnt selected", Toast.LENGTH_LONG).show();
            }
        }

Answer 1

删除 gridView.isSelected()。这将返回您的视图状态。