在Android中的ExpandableLists，我只想一次只允许一个父列表展开 [英] ExpandableLists in Android, I want to allow only one parent list to expand at a time
问题描述
我想一次只扩展父级列表中的一项，我的onCreate代码目前如下. (它可以按我的意愿工作，但是一次只允许一个父母打开的方法不起作用)
I want to make only one item in the parent list expand at a time, my code for the onCreate is currently the following. (It works as I want, But the method to allow only one parent open at a time doesnt work)
public void onCreate(Bundle savedInstanceState) {
try{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final SimpleExpandableListAdapter expListAdapter =
new SimpleExpandableListAdapter(
//FOR LEVEL 1 SCREEN
this,
createGroupList(), // METHOD TO CREATE PARENTLIST Creating group List.
R.layout.group_row, // REF TO XML FILENAME.
new String[] { "Group Item" }, // STRING ARRAY HOLDING ONE KEY THAT REF'S ALL PARENT LIST ITEMS.
new int[] { R.id.row_name }, // REF TO I.D. OF PARENT XML. ID of each group item.-Data under the key goes into this TextView.
createChildList(), // METHOD TO CREATE CHILD LST. childData describes second-level entries.
R.layout.child_row, // XMLFILE NAME FOR CHILD LIST.Layout for sub-level entries(second level).
new String[] {"Sub Item"}, // KEY FOR CHILD ITEMS IN HASHMAP. Keys in childData maps to display.
new int[] { R.id.grp_child} // XML ID FOR TEXTVIEW. Data under the keys above go into these TextViews.
);
setListAdapter( expListAdapter ); // setting the adapter in the list.
//**THIS IS WHAT I DONT KNOW HOW TO CODE:**
list = (ExpandableListView) findViewById(R.id.row_name);
list.setAdapter( expListAdapter);
list.setGroupIndicator(null);
list.setOnGroupExpandListener(new OnGroupExpandListener() {
public void onGroupExpand(int groupPosition) {
int len = expListAdapter.getGroupCount();
for (int i = 0; i < len; i++) {
if (i != groupPosition) {
list.collapseGroup(i);
}
}
}
});
}catch(Exception e){
System.out.println("Errrr +++ " + e.getMessage());
}
}
我理解上面的代码，但是，我不使用expandableListViews，而是将我的程序引用到具有expandablelist布局的.xml文件中.所以我不知道如何将以上内容应用到我的程序中...
I understand the above code, However, I dont use expandableListViews, Im refferncing my program to my .xml files with the layouts of the expandablelist. And so I dont know how to apply the above to my program...
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ExpandableListView android:id="@+id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bkg"/>
<TextView android:id="@+id/android:empty"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="No items"/>
</LinearLayout>
我不知道如何应用的方法如下:
The method that I dont know how to apply is the following:
list = (ExpandableListView) findViewById(R.id.row_name);
list.setAdapter( expListAdapter);
list.setGroupIndicator(null);
list.setOnGroupExpandListener(new OnGroupExpandListener() {
public void onGroupExpand(int groupPosition) {
int len = expListAdapter.getGroupCount();
for (int i = 0; i < len; i++) {
if (i != groupPosition) {
list.collapseGroup(i);
}
}
}
});
1)我如何将列表"引用到我的expandablelist活动中?
1) how do I refference the 'list' to my expandablelist activity?
列表在类中定义为private ExpandableListView list;
我现在没有任何错误，但是该方法不起作用.
I do not have any errors right now, But the method does not work.
任何帮助将不胜感激！
推荐答案
通过创建一个名为list的公共explist变量，然后通过以下调用将其引用到适配器视图中，解决了该问题.
The problem was solved by creating a public explist variable called list, and then referencing it to the adapter in view with the following call.
list = getExpandableListView();
因为此原因，之前的expand方法使应用程序崩溃.引用list.collapsegroup后，它工作正常.
The expand method before was crashing the app because of this. After refferencing the list.collapsegroup in, it worked fine.
public void onGroupExpand(int groupPosition) {
System.out.println("GROUP LISTENER WORKS?");
if(adptr=="expListAdapter"){
int len = expListAdapter.getGroupCount();
//System.out.println(len);
for (int i = 0; i < len; i++) {
if (i != groupPosition) {
list.collapseGroup(i);
}
}
}
else if(adptr=="expListAdapter2"){
int len = expListAdapter2.getGroupCount();
for (int i = 0; i < len; i++) {
if (i != groupPosition) {
list.collapseGroup(i);
}
}
//System.out.println(len);
}
else if(adptr=="expListAdapter3"){
int len = expListAdapter3.getGroupCount();
for (int i = 0; i < len; i++) {
if (i != groupPosition) {
list.collapseGroup(i);
}
}
}
}
这篇关于在Android中的ExpandableLists，我只想一次只允许一个父列表展开的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
