如何在诸如 C# ComboBox 之类的微调器中获取选定值？答案

【问题标题】：how can I get selected value in spinner such as C# ComboBox?如何在诸如 C# ComboBox 之类的微调器中获取选定值？
【发布时间】：2012-12-30 13:23:16
【问题描述】：

我试图制作一个包含 Id 和 Title 的自定义 Spinner。此 Spinner 显示标题，但在我的代码中的任何地方我都可以访问选定的 Id。我该怎么做。这就像 C# 中的 ComboBox。谢谢。

【问题讨论】：

标签： android spinner custom-component

【解决方案1】：

我解决了！起初我创建了一个自定义适配器：

public class SimpleCustomeAdapter extends ArrayAdapter<String>{

Context c;
List<String> id;
List<String> title;
public SimpleCustomeAdapter(Context context, int textViewResourceId,List<String> id, List<String> title) {

    super(context, textViewResourceId,id);

    c=context;
    this.id=id;
    this.title=title;
}

@Override
public View getDropDownView(int position, View convertView,ViewGroup parent) {

    return getCustomView(position, convertView, parent);        
}

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

public View getCustomView(int position, View convertView, ViewGroup parent) {
    this.setDropDownViewResource(R.layout.spinner_layout);

    LayoutInflater inflater=LayoutInflater.from(c);
    View row=inflater.inflate(R.layout.spinner_layout, parent, false);
    TextView idTextView=(TextView)row.findViewById(R.id.idCustomspinnertextView);
    idTextView.setText(id.get(position));

    TextView titleTextView=(TextView)row.findViewById(R.id.titleCustomspinnertextView);
    titleTextView.setText(title.get(position));

    Typeface externalFont=Typeface.createFromAsset(c.getAssets(), "font/BKOODB.TTF");
    titleTextView.setTypeface(externalFont);
    titleTextView.setTextSize(25);
    return row;
}

}

然后，我创建了一个自定义 Spinner：

public class CustomSpinner extends Spinner {
public CustomSpinner(Context context, AttributeSet attrs, int defStyle,
        int mode) {
    super(context, attrs, defStyle, mode);
    // TODO Auto-generated constructor stub
}

public CustomSpinner(Context context, AttributeSet attrs) {
    super(context, attrs);
    // TODO Auto-generated constructor stub
}

public CustomSpinner(Context context, int mode) {
    super(context, mode);
    // TODO Auto-generated constructor stub
}

List<String> idList;
List<String> titleList;
public void setAdapter(SimpleCustomeAdapter adapter) {
    // TODO Auto-generated method stub
    super.setAdapter(adapter);
    this.idList= adapter.id;
    this.titleList = adapter.title;
}

public void setSelectedId(long id){
    for (int i = 0; i < idList.size(); i++) {
        if(idList.get(i).contains(id+""))
        {
            this.setSelection(i);
            break;
        }
    }
    Log.d("SpinnerError", "This id is not in adapter!");
}

public CustomSpinner(Context context) {
    super(context);
    // TODO Auto-generated constructor stub
}

}

现在我的活动代码是这样的：

    public class MyActivity extends Activity {

CustomSpinner customspinner1;
Button button1;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);

    customspinner1=(CustomSpinner)findViewById(R.id.customSpinner1);
    button1=(Button) findViewById(R.id.button1);

    List<String> payoffTypeList = new ArrayList<String>();
    List<String> payoffTypeIdList = new ArrayList<String>();

    DatabaseAccess dba = new DatabaseAccess(this);

    Cursor cur = dba.getAllPayofftype();
    if (cur.moveToFirst()) {
        do {
            payoffTypeList.add(cur.getString(1));
            payoffTypeIdList.add(cur.getString(0));
        } while (cur.moveToNext());
    }



    customspinner1.setAdapter(new SimpleCustomeAdapter(this, R.layout.spinner_layout,payoffTypeIdList, payoffTypeList));

    ///example
    customspinner1.setSelectedId(12);

    button1.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            Log.d("myTag", "SlectedId = "+customspinner1.getSelectedId());
        }
    });

}

【讨论】：

【解决方案2】：

您可以按照example 获取微调器的选定值：

创建一个实现 AdapterView.OnItemSelectedListener 的嵌套类。这将提供一个回调方法，当从 Spinner 中选择了一个项目时将通知您的应用程序。

在该类的“onItemSelected”方法中，可以获取选中的项目：

public class YourItemSelectedListener implements OnItemSelectedListener {

    public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
        String selected = parent.getItemAtPosition(pos).toString();
    }

    public void onNothingSelected(AdapterView parent) {
        // Do nothing.
    }
}

最后，你的 ItemSelectedListener 需要在 Spinner 中注册：

spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());

编辑：

A spinner does not support item click events. Calling this method will raise an exception.

【讨论】：

我可以在按钮按下事件中使用 spinner1.getSelectionId()（或类似的东西）吗？我不这么认为！
例如，我的活动中有一个 button1。在 button1 onClick 事件中，我想使用 spinner1.getSelectedId()。在你的例子中我该怎么做？
spinner.getSelectedItem(),spinner.getSelectedItemId(),spinner.getSelectedItemPosition()

【解决方案3】：

如果您在单独的数组中有 id 和名称，则根据微调器选定项目的位置，您可以获得选定的项目 id。

spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

    public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int arg2, long arg3) 
    {
        System.out.println(Id_arr[spinner.getSelectedItemPosition()]);// for spinner id
        System.out.println(spinner.getSelectedItem().toString());// for spinner item
    }

    public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub

    }
});

【讨论】：