Question

我有一个Material Spinner，它显示图像和文本，但我只想检索OnItemSelected中的文本。但它返回null。

我的适配器类

   public class SpinnerCustomAdapter extends BaseAdapter {
    Context context;
    int cat_pics[];
    ArrayList<String> categoryNames;
    LayoutInflater inflter;

    public SpinnerCustomAdapter(Context applicationContext, int[] cat_pics, ArrayList<String> categoryNames) {
        this.context = applicationContext;
        this.cat_pics = cat_pics;
        this.categoryNames = categoryNames;
        inflter = (LayoutInflater.from(applicationContext));
    }

    @Override
    public int getCount() {
        return cat_pics.length;
    }

    @Override
    public Object getItem(int i) {
        return null;
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        view = inflter.inflate(R.layout.custom_spinner_items, null);
        ImageView icon = (ImageView) view.findViewById(R.id.imageView);
        TextView names = (TextView) view.findViewById(R.id.textView);
        icon.setImageResource(cat_pics[i]);
        names.setText(categoryNames.get(i));
        return view;
    }
}

在主要活动中设置适配器

 customAdapter=newSpinnerCustomAdapter(getApplicationContext(),cat_pics,allCatNames);
    spCategories.setAdapter(customAdapter);
    spCategories.setOnItemSelectedListener(this);

onItemSelected

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

        Toast.makeText(parent.getContext(), "Selected Item : " + customAdapter.getItem(position) ,
                Toast.LENGTH_LONG).show();
    }

Answer 1

在SpinnerCustomAdapter中，您的getItem()方法会返回null

@Override
public Object getItem(int i) {
    return null;
}

更新getItem()方法，如下所示：

@Override
public Object getItem(int i) {
    return categoryNames.get(i);
}

＃。您还可以使用parent.getItemAtPosition(position)来选择item。

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

    Toast.makeText(getApplicationContext(), "Selected Item : " 
                   + parent.getItemAtPosition(position).toString(), Toast.LENGTH_LONG).show();
}

Answer 2

尝试以下方法：

spinner.getSelectedItem().toString()

（OR）在OnItemSelectedListener中：

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                Log.d("SeletedItem",adapterView.getSelectedItem().toString());
            }

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

            }
        });

Answer 3

试试这样，可以帮到你

spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
            String text = spinner.getItemAtPosition(i)
            Toast.makeText(getApplicationContext(), "Selected : " text, Toast.LENGTH_SHORT).show();
        }

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

        }
    });

如何仅使用图像和文本获取自定义材质微调器中的文本

3 个答案: