Question

如何为listview 中的item设置获取焦点事件

Answer 1

ListView默认情况

当item有焦点时，item上的button等子控件获取不到焦点；
当子控件有焦点时，item无焦点无法响应onItemClick事件

ViewGroup.FOCUS_AFTER_DESCENDANTS：表示item的子控件优先于item获得焦点；
ViewGroup.FOCUS_BEFORE_DESCENDANTS：表示item优先于其子控件获得焦点。

解决办法：

[java] view plaincopy
listView.setOnItemSelectedListener(onItemSelectedListener);
private AdapterView.OnItemSelectedListener onItemSelectedListener =
new AdapterView.OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
//当此选中的item的子控件需要获得焦点时
parent.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
//else parent.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
}

@Override
public void onNothingSelected(AdapterView<?> parent) {
parent.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
}
}