CheckBox抢占Item焦点,导致Item点击无效!
方法一:CheckBox设置android:clickable="false"
方法二:在Item根布局或ListView布局设置android:descendantFocusability="blocksDescendants"
在ListView的Item中的Button,CheckBox等子控件会抢占焦点,使得点击item本身没有响应!
常用android:descendantFocusability=”blocksDescendants”覆盖子类控件焦点
descendantFocusability属性定义viewGroup和其子控件之间关系:
beforeDescendants:viewgroup会优先其子类控件而获取到焦点
afterDescendants:viewgroup只有当其子类控件不需要获取焦点时才获取焦点
blocksDescendants:viewgroup会覆盖子类控件而直接获得焦点
<LinearLayout
android:descendantFocusability="blocksDescendants">
<CheckBox
android:clickable="false"/>
</LinearLayout>
<ListView
android:descendantFocusability="blocksDescendants"/>
适配器在getview()中重复使用[被移除屏幕的item,即不可见的项]
会造成被选中的checkbox重新出现,显示异常,故需要记录checkbox的状态!
public class MyAdapter extends BaseAdapter implements OnItemClickListener {
private HashMap<Integer, Boolean> isSelected; // 记录checkbox状态
public MyAdapter() {
// 初始化所有checkbox为未选择
isSelected = new HashMap<Integer, Boolean>();
for (int i = 0; i < list.size(); i++)
isSelected.put(i, false);
}
@Override
public View getView(int position, View convertView, ViewGroup arg2) {
ViewHolder holder;
...
holder.cb.setChecked(isSelected.get(position)); // 更新checkbox状态
return view;
}
@Override
public void onItemClick(AdapterView<?> arg0, View view,
int position, long arg3) {
// 切换checkbox状态
isSelected.put(position, !isSelected.get(position));
notifyDataSetChanged();
}
}
public class MainActivity extends Activity {
...
MyAdapter adp = new MyAdapter();
listview.setAdapter(adp);
listview.setOnItemClickListener(adp);
...
}
简书://www.greatytc.com/p/b2aa0485f7b8
CSDN博客: http://blog.csdn.net/qq_32115439/article/details/53710915
GitHub博客: http://lioil.win/2016/04/20/ListView-CheckBox.html
Coding博客: http://c.lioil.win/2016/04/20/ListView-CheckBox.html