假设我有一个包含10个选项的下拉菜单,其中第3个选项已经被选中。现在问题是当用户想要更改选择时,我希望通过某种方式来指示这个已经被选择的选项(即第三个选项)。我希望通过勾号、设置某种背景或类似的方式实现。
请问有人能帮我解决这个问题吗?
BaseAdapter
扩展它,并为Spinner
和Droppdown
控件填充你的视图即可。List<String> stagesValues = new ArrayList<>(stagesResults.values());
mStageSpn.setAdapter(new DropdownAdapter(mContext, stagesValues, mStageSpn));
public class DropdownAdapter extends BaseAdapter {
private final LayoutInflater mInflater;
private List<String> mData;
private Spinner mStageSpn;
public DropdownAdapter(Context context, List<String> data, Spinner stageSpn) {
mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
mData = data;
mStageSpn = stageSpn;
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int arg0) {
return null;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = mInflater.inflate(android.R.layout.simple_spinner_item, null);
((TextView) view.findViewById(android.R.id.text1)).setText(mData.get(mStageSpn.getSelectedItemPosition()));
return view;
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent) {
View view = mInflater.inflate(R.layout.spinner_item, null);
if (mStageSpn.getSelectedItemPosition() == position)
view.setBackgroundColor(Color.RED);
((TextView) view.findViewById(R.id.text_id)).setText(mData.get(position));
return view;
}
}