我正在使用这段代码获取上下文菜单中被点击的项目位置：
public boolean onContextItemSelected(MenuItem item) {
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
int index = info.position;
}
如此建议：
但是我在这一行遇到了NullPointerException：
int index = info.position;
为什么会这样呢？
编辑
我为上下文菜单注册了两个视图，如下：
button1.onClick(view v){
registerForContextMenu(v);
openContextMenu(v);
}
button2.onClick(view v){
registerForContextMenu(v);
openContextMenu(v);
}
已编辑 开始
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
AdapterView.AdapterContextMenuInfo info;
try {
info = (AdapterView.AdapterContextMenuInfo) menuInfo;
} catch (ClassCastException e) {
// If the menu object can't be cast, logs an error.
Log.e("MENU", "bad menuInfo", e);
return;
}
position = sectionAdapter.getIndexForPosition(info.position);
menu.setHeaderTitle("");
String[] menuItems = { "item1","item2","item3","item4" };
for (int i = 0; i < menuItems.length; i++) {
menu.add(Menu.NONE, i, i, menuItems[i]);
}
}
编辑结束
public boolean onContextItemSelected(MenuItem item) {
// TODO Auto-generated method stub
int position = item.getItemId();
switch (position)
{
case 0:
break;
.
.
.
default:
break;
}
}