Question

我在我的应用中实现了一个微调器。我正在显示学校列表，但我想要一个默认值/提示，以便用户知道选择一所学校。我也希望这样做而不必将提示作为列表项。有什么想法吗？

到目前为止，这是我的微调代码：

selectSchoolSpinner = (Spinner) findViewById(R.id.select_school_spinner);
spinnerSchoolList = new ArrayList<String>();

spinnerSchoolList.add("Please select School"); 
//I don't want to have a prompt like the latter     

ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
    android.R.layout.simple_spinner_item, spinnerSchoolList);

spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

selectSchoolSpinner.setAdapter(spinnerAdapter);

Answer 1

您应该在其构造函数中为所需文本创建带有String的自定义ArrayAdapter。然后，您应该使用默认文本切换数组的第一个元素，然后在用户单击微调器后，它应切换回原始数组。

示例：

活动类：

    public class SpinnerActivity extends Activity {

    Spinner spinner;
    String defaultTextForSpinner = "Your deafult text here";
    String[] arrayForSpinner = {"One", "Two", "Three"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_spinner);

        spinner = (Spinner) findViewById(R.id.your_spinner);
        spinner.setAdapter(new CustomSpinnerAdapter(this, R.layout.spinner_row, arrayForSpinner, defaultTextForSpinner));
    }
    }

CustomSpinnerAdapter类：

    public class CustomSpinnerAdapter extends ArrayAdapter<String>{

    Context context;
    String[] objects;
    String firstElement;
    boolean isFirstTime;

    public CustomSpinnerAdapter(Context context, int textViewResourceId, String[] objects, String defaultText) {
        super(context, textViewResourceId, objects);
        this.context = context;
        this.objects = objects;
        this.isFirstTime = true;
        setDefaultText(defaultText);
    }

    @Override
    public View getDropDownView(int position, View convertView, ViewGroup parent) {
        if(isFirstTime) {
            objects[0] = 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 = objects[0];
        objects[0] = defaultText;
    }

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

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View row = inflater.inflate(R.layout.spinner_row, parent, false);
        TextView label = (TextView) row.findViewById(R.id.spinner_text);
        label.setText(objects[position]);

        return row;
    }

    }

Answer 2

尝试使用setSelection方法设置默认文本：

spinner.setSelection(adapter.getPosition(DEFAULT_CURRENCY_TYPE))

看看这个链接：How to make an Android Spinner with initial text "Select One"。它非常有用（@aaronvargas答案是你需要的）。

Answer 3

       @Override
    protected void onPostExecute(PositionBean[] result) {
        String[] spinnerArray = new String[result.length];

        if(result!=null) {

            for (int i = 0; i < result.length; i++) {

                String positionName = result[i].getPositionName();
                spinnerArray[i] = result[i].getPositionName();

            }
            ArrayList<String> positionList = new ArrayList<String>(Arrays.asList(spinnerArray));
            positionList.add(0,"select");
            String [] positions = positionList.toArray(new String[positionList.size()]);

            ArrayAdapter<String> adapter = new ArrayAdapter<String>(EngineActivity.this, android.R.layout.simple_spinner_item,
                    positions);
            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            positionSpinner.setAdapter(adapter);
        }else{
            Log.d("NULL", "This is null");
        }

    }

Android微调器设置默认文本

3 个答案: