Android 微调器不在 MyOnItemSelectedListener 中显示所选项目的位置

Question

这些是我在我的应用程序中使用的 3 个微调器。 crustSP、sizeSP 和 extraDescriptionOneSP。功能性虎钳这 3 个微调器工作完美（加载项目并且可以 select 根据需要任何项目）但我的问题是在 crustSP 和 sizeSP 微调器它不显示 selected 项目位置在 MyOnItemSelectedListener .它显示了 extraDescriptionOneSP 的 selected 项目位置。

谁能想出 crustSP 和 sizeSP 微调器的问题所在。我非常想要 selected 项目位置。

                crust = Utils.removeDuplicatesFromList(crust);
                ArrayAdapter<String> dataAdapterCru = new ArrayAdapter<String>(
                        this, android.R.layout.simple_spinner_item, crust);
                dataAdapterCru
                        .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                crustSP.setAdapter(dataAdapterCru);
                crustSP.setOnItemSelectedListener(new OnItemSelectedListener() {

                    public void onNothingSelected(AdapterView<?> arg0) {
                    }

                    @Override
                    public void onItemSelected(AdapterView<?> parent,
                            View view, int position, long id) {

                        String crustSelectedItem = crustSP.getSelectedItem()
                                .toString();

                        List<String> resultDescription = getFilteredDescriptions(
                                crustSelectedItem, description);
                        ArrayAdapter<String> dataAdapterDes = new ArrayAdapter<String>(
                                ActivityPizzaCustomize.this,
                                android.R.layout.simple_spinner_item,
                                resultDescription);
                        dataAdapterDes
                                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        sizeSP.setAdapter(dataAdapterDes);
                        sizeSP.setAdapter(new NothingSelectedSpinnerAdapter(
                                dataAdapterDes,
                                R.layout.contact_spinner_row_nothing_selected,
                                ActivityPizzaCustomize.this));
                    }
                });

                sizeSP.setOnItemSelectedListener(new OnItemSelectedListener() {

                    public void onNothingSelected(AdapterView<?> arg0) {
                        return;
                    }

                    @Override
                    public void onItemSelected(AdapterView<?> parent,
                            View view, int position, long id) {

                    }
                });

                extraDescriptionOneSP
                        .setOnItemSelectedListener(new MyOnItemSelectedListener());
                extraDescription = Utils
                        .removeDuplicatesFromList(extraDescription);
                ArrayAdapter<String> dataAdapterExtraDesOne = new ArrayAdapter<String>(
                        this, android.R.layout.simple_spinner_item,
                        extraDescription);
                dataAdapterExtraDesOne
                        .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                extraDescriptionOneSP.setAdapter(dataAdapterExtraDesOne);
                extraDescriptionOneSP
                        .setAdapter(new NothingSelectedSpinnerAdapter(
                                dataAdapterExtraDesOne,
                                R.layout.contact_spinner_row_nothing_selected,
                                this));

我的 MyOnItemSelectedListener 代码，

public class MyOnItemSelectedListener implements OnItemSelectedListener {

        @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {

            // check which spinner triggered the listener
            switch (parent.getId()) {

            case R.id.sp_crust:


                System.out.println("crust = " + position);
                break;

            case R.id.sp_pizza_size:


                System.out.println("size = " + position);
                break;

            case R.id.sp_extratoppingone:


                System.out.println("extratoppingone = " + position);
                break;

Answer 1

问题是，您还必须将相同的 MyOnItemSelectedListener 设置为 custSP 和 sizeSP。

extraDescriptionOneSP.setOnItemSelectedListener(new MyOnItemSelectedListener(ActivityPizzaCustomize.this));
custSP.setOnItemSelectedListener(new MyOnItemSelectedListener(ActivityPizzaCustomize.this));
sizeSP.setOnItemSelectedListener(new MyOnItemSelectedListener(ActivityPizzaCustomize.this));

为了保持您的逻辑，您应该对 MyOnItemSelectedListener 进行一些更改，并在每个选定的微调项上添加您想要执行的操作，如下所示：

public class MyOnItemSelectedListener implements OnItemSelectedListener 
{
   Activity activity;

    public MyOnItemSelectedListener (Activity p_activity)
   {
       activity = p_activity;
   }
  @Override
    public void onItemSelected(AdapterView<?> parent, View view,
            int position, long id) {

        // check which spinner triggered the listener
        switch (parent.getId()) {

        case R.id.sp_crust:
         {
                System.out.println("crust = " + position);

 String crustSelectedItem = crustSP.getSelectedItem()
                                .toString();

                        List<String> resultDescription = getFilteredDescriptions(
                                crustSelectedItem, description);
                        ArrayAdapter<String> dataAdapterDes = new ArrayAdapter<String>(
                                activity,
                                android.R.layout.simple_spinner_item,
                                resultDescription);
                        dataAdapterDes
                                .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                        sizeSP.setAdapter(dataAdapterDes);
                        sizeSP.setAdapter(new NothingSelectedSpinnerAdapter(
                                dataAdapterDes,
                                R.layout.contact_spinner_row_nothing_selected,
                                activity));

            }
            break;

        case R.id.sp_pizza_size:


            System.out.println("size = " + position);
            break;

        case R.id.sp_extratoppingone:


            System.out.println("extratoppingone = " + position);
            break;

Answer 2

试试这个，这应该适合你

crust = Utils.removeDuplicatesFromList(crust);
                    ArrayAdapter<String> dataAdapterCru = new ArrayAdapter<String>(
                            this, android.R.layout.simple_spinner_item, crust);
                    dataAdapterCru
                            .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    crustSP.setAdapter(dataAdapterCru);
                    crustSP.setOnItemSelectedListener(new MyOnItemSelectedListener(ActivityPizzaCustomize.this) {

                        public void onNothingSelected(AdapterView<?> arg0) {
                        }

                        @Override
                        public void onItemSelected(AdapterView<?> parent,
                                View view, int position, long id) {

                            String crustSelectedItem = crustSP.getSelectedItem()
                                    .toString();

                            List<String> resultDescription = getFilteredDescriptions(
                                    crustSelectedItem, description);
                            sizeSP
                            .setOnItemSelectedListener(new MyOnItemSelectedListener(ActivityPizzaCustomize.this));
                            ArrayAdapter<String> dataAdapterDes = new ArrayAdapter<String>(
                                    ActivityPizzaCustomize.this,
                                    android.R.layout.simple_spinner_item,
                                    resultDescription);
                            dataAdapterDes
                                    .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                            sizeSP.setAdapter(dataAdapterDes);
                            sizeSP.setAdapter(new NothingSelectedSpinnerAdapter(
                                    dataAdapterDes,
                                    R.layout.contact_spinner_row_nothing_selected,
                                    ActivityPizzaCustomize.this));
                        }
                    });

Android 微调器不在 MyOnItemSelectedListener 中显示所选项目的位置

Android Spinner doesn't show selected item position in MyOnItemSelectedListener

android

android-spinner