我在这个网站上读到,如果我们想知道 SelectedItem 的索引 (.getSelectedItemPosition()),就必须自定义 ListView 的 setOnItemSelectedListener 和 setOnItemClickListener。所以这就是我所做的,但它不存储 SekectedItem 的位置,而是我总是 -1 ...
我想要做的只是为用户提供一种方法,通过选定的项目和单击按钮从列表中删除项目。
请参阅下面的代码:
listViewPeople.setOnItemClickListener(new ListView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int i, long l) {
try {
// Remembers the selected Index
listViewPeopleId = listViewPeople.getSelectedItemPosition();
}
catch(Exception e) {
System.out.println("Nay, cannot get the selected index");
}
}
});
listViewPeople.setOnItemSelectedListener(new ListView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> a, View v, int i, long l) {
try {
// Remembers the selected Index
listViewPeopleId = listViewPeople.getSelectedItemPosition();
System.out.println("Yay, set the selected index " + listViewPeopleId);
}
catch(Exception e) {
System.out.println("Nay, cannot get the selected index " + listViewPeopleId);
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
try {
// Remembers nothing selected
listViewPeopleId = -1;
System.out.println("Yay, set that nothing is selected " + listViewPeopleId);
}
catch(Exception e) {
System.out.println("Nay, cannot set that nothing is selected " + listViewPeopleId);
}
}
});
怎么了??
谢谢您的帮助!
克里斯托夫