android(1) listView二级目录选中效果

一.listView的二级目录且选中实现：

    记录下来，以便以后可能会用到，直接上贴源码：

先上效果图：

                 

主界面：

public class MainActivity extends Activity {// 树形Listview显示类别private ExpandableListView listview1;// 一级private List<String> groups;// 二级private List<List<String>> child;// 适配器private ListViewAdapter mAdapter;//记录点击的节点位置，初始为-1public static int children_item = -1;public static int parent_item = -1;//记录上一次点击的itemprivate View view;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listview1 = (ExpandableListView) findViewById(R.id.listview1);mAdapter = new ListViewAdapter(this, ListViewAdapter.PaddingLeft >> 1);groups = getListData();    //一级目录child = new ArrayList<List<String>>();List<ListViewAdapter.TreeNode>  treeNode = mAdapter.GetTreeNode();        //为每一个一级目录下添加内容for (int i = 0; i < groups.size(); i++) {ListViewAdapter.TreeNode node = new ListViewAdapter.TreeNode();node.parent = groups.get(i);child.add(i,getListData());for (int ii = 0; ii < child.get(i).size(); ii++) {node.childs.add(child.get(i).get(ii));}treeNode.add(node);}mAdapter.UpdateTreeNode(treeNode);listview1.setAdapter(mAdapter);listview1.setOnChildClickListener(new OnChildClickListener() {@Overridepublic boolean onChildClick(ExpandableListView arg0,View arg1, int parent, int children, long arg4) {                //当前item变色arg1.setBackgroundResource(R.color.color1);//上一个item还原if (parent_item != -1&& children_item != -1&& (children_item != children || parent_item != parent)) {view.setBackgroundResource(R.drawable.listview_item_bg);}view = arg1;children_item = children;parent_item = parent;return false;}});}    public List<String> getListData() {List<String> list = new ArrayList<String>();list.add("语文");list.add("数学");list.add("英语");list.add("历史");list.add("毛概");list.add("自然");return list;}}

适配器：

public class ListViewAdapter extends BaseExpandableListAdapter {public static final int ItemHeight = 72;// 每项的高度public static final int PaddingLeft = 48;// 每项的高度private int myPaddingLeft = 0;    static public class TreeNode {public String parent;public List<String> childs = new ArrayList<String>();}List<TreeNode> treeNodes = new ArrayList<TreeNode>();Context parentContext;public ListViewAdapter(Context view, int myPaddingLeft) {parentContext = view;this.myPaddingLeft = myPaddingLeft;}public List<TreeNode> GetTreeNode() {return treeNodes;}public void UpdateTreeNode(List<TreeNode> nodes) {treeNodes = nodes;}public void RemoveAll() {treeNodes.clear();}public Object getChild(int groupPosition, int childPosition) {return treeNodes.get(groupPosition).childs.get(childPosition).toString();}public int getChildrenCount(int groupPosition) {return treeNodes.get(groupPosition).childs.size();}static public TextView getTextView(Context context) {AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ItemHeight);TextView textView = new TextView(context);textView.setLayoutParams(lp);textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);textView.setTextSize(15);return textView;}public View getChildView(int groupPosition, int childPosition,boolean isLastChild, View convertView, ViewGroup parent) {TextView textView = getTextView(this.parentContext);textView.setText(getChild(groupPosition, childPosition).toString());textView.setPadding(myPaddingLeft + PaddingLeft, 0, 0, 0);textView.setTextSize(15);return textView;}public View getGroupView(int groupPosition, boolean isExpanded,View convertView, ViewGroup parent) {//不会选中丢失if (MainActivity.children_item != -1) {if (MainActivity.children_item == groupPosition) {convertView.setBackgroundResource(R.color.color1);} else {convertView.setBackgroundResource(R.drawable.listview_item_bg);}}TextView textView = getTextView(this.parentContext);textView.setText(getGroup(groupPosition).toString());textView.setPadding(myPaddingLeft + (PaddingLeft >> 1), 0, 0, 0);return textView;}public long getChildId(int groupPosition, int childPosition) {return childPosition;}public Object getGroup(int groupPosition) {return treeNodes.get(groupPosition).parent.toString();}public int getGroupCount() {return treeNodes.size();}public long getGroupId(int groupPosition) {return groupPosition;}public boolean isChildSelectable(int groupPosition, int childPosition) {return true;}public boolean hasStableIds() {return true;}}

xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:background="@android:color/background_light"    android:orientation="vertical" >   <ExpandableListView            android:id="@+id/listview1"            android:layout_width="fill_parent"            android:layout_height="fill_parent"            android:choiceMode="singleChoice" /></LinearLayout>

drawable/listview_item_bg.xml：

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:drawable="@android:color/background_dark" android:state_selected="true"></item>    <item android:drawable="@android:color/background_dark" android:state_pressed="true"></item>   <item android:drawable="@android:color/background_dark" android:state_focused="true"></item>    <item android:drawable="@android:color/transparent"></item></selector>

color.xml:

<?xml version="1.0" encoding="utf-8"?><resources>    <color name="color1">@android:color/background_dark</color></resources>