android ExpandableListView 实现全选，全不选，部分选中，不可选择的功能

最近一个项目要实现这样的功能：在ExpandableListView实现多选框，组选项的多选框要有四种状态：选中，没有选中，不可选，部份选中；子组项的多选框要有三种状态：选中，没有选中，不可选。首先想到使用是checkbox控件，但checkbox只有两种状态：选中，没有选中，怎么办好？重写checkbox控件吗？噢，no，

，后来灵机一动：把checkbox换成图片不就行了。

,现在把这部份抽出来，分享给大家：

先看效果图：



这里没有做不可选状态，不过你看明白代码，你就知道怎么可以实现不可选的状态。

亮点；

1.我把组选项的，子选项的数据封装成对象。组选项的数据包含子选项的数据。

2.子选项的多选框状态控制组选项的状态变化。

3.很好复用了ListView，大家可以参考。

不多说：看代码：

组选项和子选项封装的代码：

public class Group {

/** 标记是否选中的状态, 0为不可选,1为选中,2为没有选中,3为部份选中 */
public int flag;
/** 组选项所对应的组名 */
public String groupname;
/** 组选项下面子选项要显示的数据 */
public ArrayList<Child> childData;
}

public class Child {

/** 标记是否选中的状态, 0为不可选,1为选中,2为没有选中 */
public int flag = 1;
/** 子选项所对应的组名 */
public String childname;

}

MainActivity类的代码：

public class MainActivity extends Activity {

private ExpListAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

ExpandableListView expandableListView = (ExpandableListView) this.findViewById(R.id.expandablelistview);

ArrayList<Group> groupList = new ArrayList<Group>();
ArrayList<Child> chlidList = null;
Group group = null;
Child child = null;
for(int i = 0; i < 10; i++) {
group = new Group();
group.flag = 1;
group.groupname = "组名" + i;

chlidList = new ArrayList<Child>();
for(int j = 0; j < 3; j++) {
child = new Child();
child.flag = 2;
child.childname = "子名" + i + " " + j;
chlidList.add(child);
}

group.childData = chlidList;

groupList.add(group);
}

adapter = new ExpListAdapter(this, groupList, expandableListView);
expandableListView.setAdapter(adapter);
expandableListView.setOnChildClickListener(adapter);

int groupCount = adapter.getGroupCount(); // 全部展开
for (int i = 0; i < groupCount; i++) {
expandableListView.expandGroup(i);
}
}

}

好了，到了最关键的代码：

ExpListAdapter类的代码，因为太长，只贴getChildView和getGroupView方法代码：

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

View view = convertView;
ChildViewHolder childHolder = null;
if (null == view) {
view = inflater.inflate(R.layout.child_item, null);
childHolder = new ChildViewHolder();
childHolder.upload_childcheckbox = (ImageView) view.findViewById(R.id.childcheckbox);
childHolder.upload_childtextview = (TextView) view.findViewById(R.id.childtextview);
view.setTag(childHolder);
} else {
childHolder = (ChildViewHolder) view.getTag();
}

if(childHolder.childOnClickListener == null) {
childHolder.childOnClickListener = new ChildOnClickListener();
}

childHolder.childOnClickListener.setData(groupPosition, childPosition); // 传要点击的值过去
childHolder.upload_childcheckbox.setOnClickListener(childHolder.childOnClickListener);

String childname = dataArray.get(groupPosition).childData.get(childPosition).childname;
childHolder.upload_childtextview.setText(childname);

// 子选项的状态
int i = 0;
i = dataArray.get(groupPosition).childData.get(childPosition).flag;
if(i == 1) {
childHolder.upload_childcheckbox.setImageResource(R.drawable.check);
} else if(i == 2) {
childHolder.upload_childcheckbox.setImageResource(R.drawable.no_check);
} else if(i == 0) {
childHolder.upload_childcheckbox.setImageResource(R.drawable.uncheckable);
}

return view;
}

// 该方法决定每个组选项的外观
@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

View view = convertView;
GroupViewHolder groupHolder = null;
if (null == view) {
view = inflater.inflate(R.layout.group_item, null);
groupHolder = new GroupViewHolder();
groupHolder.upload_groupcheckbox = (ImageView) view.findViewById(R.id.groupcheckbox);
groupHolder.upload_groupmain = (TextView) view.findViewById(R.id.groupmain);
groupHolder.upload_image = (ImageView) view.findViewById(R.id.image);

view.setTag(groupHolder);
} else {
groupHolder = (GroupViewHolder) view.getTag();
}

if(groupHolder.groupOnClickListener == null) {
groupHolder.groupOnClickListener = new GroupOnClickListener();
}

groupHolder.groupOnClickListener.setData(groupPosition); // 传要点击的值过去
groupHolder.upload_groupcheckbox.setOnClickListener(groupHolder.groupOnClickListener);

String s = dataArray.get(groupPosition).groupname;
groupHolder.upload_groupmain.setText(s);

int childsize = dataArray.get(groupPosition).childData.size();
int flag = 0;
int no_count = 0; // 不可选
int select_count = 0; // 选中
int count = 0; // 没有选中
for(int j = 0; j < childsize; j++) {
flag = dataArray.get(groupPosition).childData.get(j).flag;
if(flag == 0) {
no_count++ ;
} else if(flag == 1) {
select_count++;
} else if(flag == 2) {
count++;
}
}

// 根据子选项的状态来判断组选项的多选框的状态
if (no_count == childsize) { // 组选项多选项不可选
dataArray.get(groupPosition).flag = 0;
}
if (select_count == childsize) { // 组选项多选项全选
dataArray.get(groupPosition).flag = 1;
}
if (count == childsize) { // 组选项多选项没有选中
dataArray.get(groupPosition).flag = 2;
}
if (select_count < childsize && select_count > 0) { // 组选项多选项部分选中
dataArray.get(groupPosition).flag = 3;
}

int i = 0;

// 组选项的状态
i = dataArray.get(groupPosition).flag;
if(i == 1) {
groupHolder.upload_groupcheckbox.setImageResource(R.drawable.check);
} else if(i == 2) {
groupHolder.upload_groupcheckbox.setImageResource(R.drawable.no_check);
} else if(i == 3) {
groupHolder.upload_groupcheckbox.setImageResource(R.drawable.part_check);
} else if(i == 0) {
groupHolder.upload_groupcheckbox.setImageResource(R.drawable.uncheckable);
}

b = exList.isGroupExpanded(groupPosition); // 判断此组是否展开
if (b) {
groupHolder.upload_image.setBackgroundResource(R.drawable.group_icon_down);
} else {
groupHolder.upload_image.setBackgroundResource(R.drawable.group_icon_up);
}

return view;
}

最后：贴上demo的代码。但我找不到在哪上传文件啊,求好心人帮忙。