设置微调器项目的ID

Question

我有一个字符串数组我正在填充一个Spinner对象.但是,我想在Spinner的每个元素上附加一个ID,所以当用户选择一个项目时,我会将其ID用于保存到其他一些数据.我怎样才能做到这一点？

Answer 1

创建一个StringWithTag类,并使用代替列表中的字符串名称,如下所示: -

public class StringWithTag {
    public String string;
    public Object tag;

    public StringWithTag(String stringPart, Object tagPart) {
        string = stringPart;
        tag = tagPart;
    }

    @Override
    public String toString() {
        return string;
    }
}

在添加项目到微调部分: -

List<StringWithTag> list = new ArrayList<StringWithTag>();
list.add(new StringWithTag("Oldman", "12345"));
list.add(new StringWithTag("Umpire", "987654"));
list.add(new StringWithTag("Squad", "ABCDEE"));
ArrayAdapter<StringWithTag> adap = new ArrayAdapter<StringWithTag> (this, android.R.layout.simple_spinner_item, list);
....
....

在听众中: -

public void onItemSelected(AdapterView<?> parant, View v, int pos, long id) {
    StringWithTag s = (StringWithTag) parant.getItemAtPosition(pos);
    Object tag = s.tag;
}

瞧!}

Answer 2

你是什​​么意思id.您可以使用ArrayAdapter填充Spinner.选择项目时,只需从适配器获取元素并保存所需的数据.

Spinner spinner = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<MyObject> adapter = ... // initialize the adapter
adapter.setDropDownViewResource(android.R.layout.some_view);
spinner.setAdapter(adapter);

当选择项目时

public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
    MyObject selected = parent.getItemAtPosition(pos);
    // save any data relevant with selected item   
}

如果要在db中存储数据,可以使用CursorAdapter并在onItemSelected中从光标中获取所选的项ID.