如何在 Android 上的 Spinner 中使用 itemClickListener

Question

在我的应用程序中，我有一个Spinner，我应该将一些来自服务器的数据显示到这个Spinner。
我的服务器数据有：

"sections": [{
            "id": 1,
            "name": "Item 1"
        }, {
            "id": 2,
            "name": "Item 2"
        }, {
            "id": 3,
            "name": "Item 3"
        }]

对于这个spinner，我应该设置默认文本，以便第一次显示以及当用户点击spinnersitem显示这个项目而不是默认文本。

为此，我编写了以下代码，但我不知道如何将 clickListener 设置为此项目以获取每个项目的 ID！

我的适配器代码：

public class DashboardSupportSectionAdapter extends ArrayAdapter<Section> {

    Context context;
    List<Section> model;
    String firstElement;
    boolean isFirstTime;

    public DashboardSupportSectionAdapter(Context context, int textViewResourceId, List<Section> model, String defaultText) {
        super(context, textViewResourceId, model);
        this.context = context;
        this.model = model;
        this.isFirstTime = true;
        setDefaultText(defaultText);
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        if (isFirstTime) {
            model.get(0).setName(firstElement);
            isFirstTime = false;
        }
        return getCustomView(position, convertView, parent);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        notifyDataSetChanged();
        return getCustomView(position, convertView, parent);
    }

    public void setDefaultText(String defaultText) {
        this.firstElement = model.get(0).getName();
        model.get(0).setName(defaultText);
    }

    public View getCustomView(final int position, View convertView, ViewGroup parent) {

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View row = inflater.inflate(R.layout.row_dashboard_support_section, parent, false);
        TextView label = row.findViewById(R.id.spinner_text);
        label.setText(model.get(position).getName());

        return row;
    }

}

我的活动代码：

public class DashboardCreateSupportActivity extends BaseActivity {

    @BindView(R.id.dashboardCreateSupport_sectionSpinner)
    Spinner dashboardCreateSupport_sectionSpinner;
    String defaultTextForSpinner = "Select section";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_dashboard_create_support);

        ButterKnife.bind(this);

        dashboardCreateSupport_sectionSpinner.setAdapter(new DashboardSupportSectionAdapter(this, R.layout.row_dashboard_support_section,
                Constants.supportListResponse.getRes().getSections(), defaultTextForSpinner));

    }
}

我希望在单击每个项目时，在toast 消息中显示项目的 ID。

怎么办？

Answer 1

dashboardCreateSupport_sectionSpinner.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 Constants.supportListResponse.getRes().getSections().get(position).getId();
            }
        });

Answer 2

    dashboardCreateSupport_sectionSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            Section item  = Constants.supportListResponse.getRes().getSections().getItem(position);
            //use item object
        }
        @Override
        public void onNothingSelected(AdapterView<?> parent) {

        }
    });

使用 setOnItemSelectedListener。

我什至想建议修改如下代码：

    final DashboardSupportSectionAdapter dashboardSupportSectionAdapter =new DashboardSupportSectionAdapter(this, android.R.layout.simple_list_item_1,
        sections, "default");
    dashboardCreateSupport_sectionSpinner.setAdapter(dashboardSupportSectionAdapter);

在onItemSelected里面

    Section item  = dashboardSupportSectionAdapter.getItem(position);