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OnItemSelected无法处理自定义微调器适配器类

android-xml android-spinner android-layout android

Rakshit Sorathiya · 技术社区 · 6 年前

MSelected方法无法获取选定项在微调器中的位置。

CustomSpinnerAdapter.java文件

public class CustomSpinnerAdapter extends BaseAdapter {
Context context;
List<String> userNames;
LayoutInflater inflter;

public CustomSpinnerAdapter(Context applicationContext, List<String> userNames) {
    this.context = applicationContext;
    this.userNames = userNames;
    inflter = (LayoutInflater.from(applicationContext));
}

@Override
public int getCount() {
    return userNames.size();
}

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

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

@NonNull
@SuppressLint({"ViewHolder", "InflateParams"})
@Override
public View getView(int i, View view, ViewGroup viewGroup) {
    view = inflter.inflate(R.layout.custom_spinner_item, null);
    CustomTextView names = (CustomTextView) view.findViewById(R.id.tv_spinner_item);
    names.setText(userNames.get(i));
    return view;
   }
}

private SpinnerAdapter customAdapter;
private List<String> eqIds = new ArrayList<>;

 apiInterface = ApiRequest.createService(ApiInterface.class);
    Call<EquipmentTypeModel> call = apiInterface.getEquipmentType("application/json", token, id);

    call.enqueue(new Callback<EquipmentTypeModel>() {
        @Override
        public void onResponse(Call<EquipmentTypeModel> call, Response<EquipmentTypeModel> response) {
            if (response.isSuccessful()) {
                eqIds.addAll(response.body().getData().getEquipmentList().getEquipIds());
            }
        }

        @Override
        public void onFailure(Call<EquipmentTypeModel> call, Throwable t) {

        }
    });
    customAdapter = new CustomSpinnerAdapter(mContext, eqIds);
    spTypeModel.setAdapter(customAdapter);
    spTypeModel.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(mContext, String.valueOf(parent.getAdapter().getItem(position)), Toast.LENGTH_SHORT).show();
        }

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

        }
    });

2 回复 | 直到 6 年前

Son Truong 6 年前

String selectedValue = spTypeModel.getSelectedItem().toString();

String selectedValue = String.valueOf(parent.getAdapter().getItem(position));

而不是

String selectedValue = String.valueOf(position);

更新: getItem 自定义适配器中的方法

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

private SpinnerAdapter customAdapter;

到

private CustomSpinnerAdapter customAdapter;

然后在向适配器添加新数据后添加此行。

eqIds.addAll(response.body().getData().getEquipmentList().getEquipIds());
customAdapter.notifyDataSetChanged(); // Add this line to notify your adapter about new data

更新3: 因为微调器的高度是18dp。

在自定义文本视图中,您还可以设置padding 4dp(对于top和bot将是8dp)

您可以将微调器高度设置为 wrap_content 或保持当前高度,但从微调器或自定义文本视图中删除填充。这取决于你。

Joaquín 6 年前

如果这样做有效的话就试试看(它会显示你的价值,而不是位置)

  @Override
    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
        Toast.makeText(mContext, parent.getItemAtPosition(position).toString(), Toast.LENGTH_SHORT).show();
    }