我有一个带标题的简单导航抽屉(见图)。
我现在要做的是每当标题(listview-item with position 0)被点击时,将向下箭头图标(标题的右下角)更改为向上箭头图标或旋转它所以箭头指向上方。如何使用我的适配器实现这一目标?
我的列表 - 适配器:
public class MyAdapter extends BaseAdapter {
private String[] _navTitles;
private int[] _navIcons;
private String _nameHeader;
private int _profileHeader;
private String _emailHeader;
public int _arrowHeader;
public MyAdapter(String[] navTitles, int[] navIcons, String nameHeader, String emailHeader, int profileHeader, int arrowHeader) {
_navTitles = navTitles;
_navIcons = navIcons;
_nameHeader = nameHeader;
_emailHeader = emailHeader;
_profileHeader = profileHeader;
_arrowHeader = arrowHeader;
}
@Override
public int getCount() {
return _navTitles.length;
}
@Override
public Object getItem(int position) {
return _navTitles[position];
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view = convertView;
ViewHolder viewHolder = null;
if (view == null) {
if (position == 0) {
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.header, parent, false);
viewHolder = new ViewHolder();
viewHolder.profileView = (CircleImageView) view.findViewById(R.id.circleView);
viewHolder.nameView = (TextView) view.findViewById(R.id.name);
viewHolder.emailView = (TextView) view.findViewById(R.id.email);
viewHolder.arrowView = (ImageView) view.findViewById(R.id.arrow);
viewHolder.holderID = 0;
view.setTag(viewHolder);
} else {
view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_row, parent, false);
viewHolder = new ViewHolder();
viewHolder.textView = (TextView) view.findViewById(R.id.rowText);
viewHolder.imageView = (ImageView) view.findViewById(R.id.rowIcon);
viewHolder.holderID = 1;
view.setTag(viewHolder);
}
} else {
viewHolder = (ViewHolder) view.getTag();
}
if (_navTitles.length > position && position != 0) {
viewHolder.textView.setText(_navTitles[position]);
viewHolder.textView.setTag(_navTitles[position]);
viewHolder.imageView.setImageResource(_navIcons[position]);
viewHolder.imageView.setTag(_navIcons[position]);
}
if (position == 0) {
viewHolder.profileView.setImageResource(_profileHeader);
viewHolder.nameView.setText(_nameHeader);
viewHolder.emailView.setText(_emailHeader);
viewHolder.arrowView.setImageResource(_arrowHeader);
}
return view;
}
public static class ViewHolder {
int holderID;
TextView textView;
ImageView imageView;
CircleImageView profileView;
TextView nameView;
TextView emailView;
ImageView arrowView;
}
}
感谢您的帮助!
答案 0 :(得分:0)
我自己解决了。如果有人需要它:
final ViewHolder finalViewHolder = viewHolder;
viewHolder.arrowView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (finalViewHolder.arrowView.getTag().equals("down")) {
finalViewHolder.arrowView.setImageResource(R.drawable.ic_arrow_drop_up_white_48dp);
finalViewHolder.arrowView.setTag("up");
} else if (finalViewHolder.arrowView.getTag().equals("up")) {
finalViewHolder.arrowView.setImageResource(R.drawable.ic_arrow_drop_down_white_48dp);
finalViewHolder.arrowView.setTag("down");
}
}
});