学步园

ExpandableListActivity可以展开或隐藏子项。用getExpandableListView().setIndicatorBounds(left, right)可以用来改变指示图标的位置，在getGroupView可以重写成你想要的显示效果，本程序实现在父项实现图文混排的效果。

@Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);</p> <p> setListAdapter(mAdapter);<br /> registerForContextMenu(getExpandableListView());<br /> getExpandableListView().setIndicatorBounds(260, 300); //设置指示图标的位置<br /> }<br /> @Override<br /> public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {<br /> // menu.setHeaderTitle("Sample menu");<br /> // menu.add(0, 0, 0, R.string.expandable_list_sample_action);<br /> }</p> <p> @Override<br /> public boolean onContextItemSelected(MenuItem item) {<br /> ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo) item.getMenuInfo();<br /> String title = ((TextView) info.targetView).getText().toString();</p> <p> int type = ExpandableListView.getPackedPositionType(info.packedPosition);<br /> if (type == ExpandableListView.PACKED_POSITION_TYPE_CHILD) {<br /> int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);<br /> int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);<br /> Toast.makeText(this, title + ": Child " + childPos + " clicked in group " + groupPos,<br /> Toast.LENGTH_SHORT).show();<br /> return true;<br /> } else if (type == ExpandableListView.PACKED_POSITION_TYPE_GROUP) {<br /> int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);<br /> Toast.makeText(this, title + ": Group " + groupPos + " clicked", Toast.LENGTH_SHORT).show();<br /> return true;<br /> }</p> <p> return false;<br /> }<br /> /**<br /> * A simple adapter which maintains an ArrayList of photo resource Ids.<br /> * Each photo is displayed as an image. This adapter supports clearing the<br /> * list of photos and adding a new photo.<br /> *<br /> */<br /> public class MyExpandableListAdapter extends BaseExpandableListAdapter {<br /> // Sample data set. children[i] contains the children (String[]) for groups[i].<br /> ViewHolder viewHolder;<br /> private LayoutInflater mInflater;<br /> private String[] groups = { "美食", "购物", "出行", "玩乐" };<br /> private String[][] children = {<br /> { "粤菜", "湘菜", "川菜", "火锅", "小吃" },<br /> { "Ace", "Bandit", "Cha-Cha", "Deuce" },<br /> { "Fluffy", "Snuggles" },<br /> { "Goldy", "Bubbles" }<br /> };</p> <p> public MyExpandableListAdapter(Context context){<br /> mInflater = LayoutInflater.from(context);<br /> }</p> <p> public Object getChild(int groupPosition, int childPosition) {<br /> return children[groupPosition][childPosition];<br /> }<br /> public long getChildId(int groupPosition, int childPosition) {<br /> return childPosition;<br /> }<br /> public int getChildrenCount(int groupPosition) {<br /> return children[groupPosition].length;<br /> }<br /> public TextView getGenericView() {<br /> // Layout parameters for the ExpandableListView<br /> AbsListView.LayoutParams lp = new AbsListView.LayoutParams(<br /> ViewGroup.LayoutParams.FILL_PARENT, 64);<br /> TextView textView = new TextView(DiscountSearch.this);<br /> textView.setLayoutParams(lp);<br /> // Center the text vertically<br /> textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);<br /> // Set the text starting position<br /> textView.setPadding(36, 0, 0, 0);<br /> return textView;<br /> }</p> <p> public View getChildView(int groupPosition, int childPosition, boolean isLastChild,<br /> View convertView, ViewGroup parent) {<br /> TextView textView = getGenericView();<br /> textView.setText(getChild(groupPosition, childPosition).toString());<br /> return textView;<br /> }<br /> public Object getGroup(int groupPosition) {<br /> return groups[groupPosition];<br /> }<br /> public int getGroupCount() {<br /> return groups.length;<br /> }<br /> public long getGroupId(int groupPosition) {<br /> return groupPosition;<br /> }<br /> public View getGroupView(int groupPosition, boolean isExpanded, View convertView,<br /> ViewGroup parent) {<br /> if(convertView == null){<br /> convertView = mInflater.inflate(R.layout.shop_search, null);<br /> convertView.setId(R.layout.shop_search);<br /> viewHolder = new ViewHolder();<br /> viewHolder.shopType = (TextView)convertView.findViewById(R.id.simple_list_item_icon_tv);<br /> viewHolder.icon = (ImageView)convertView.findViewById(R.id.simple_list_item_icon_iv);<br /> convertView.setTag(viewHolder);<br /> }else{<br /> viewHolder = (ViewHolder)convertView.getTag();<br /> }<br /> viewHolder.shopType.setText(getGroup(groupPosition).toString());<br /> viewHolder.icon.setImageBitmap(mShoppingIcon);<br /> // TextView textView = getGenericView();<br /> // textView.setText(getGroup(groupPosition).toString());<br /> // return textView;<br /> return convertView;<br /> }</p> <p> public class ViewHolder {<br /> TextView shopType;<br /> ImageView icon;<br /> }<br /> public boolean isChildSelectable(int groupPosition, int childPosition) {<br /> return true;<br /> }<br /> public boolean hasStableIds() {<br /> return true;<br /> }<br /> }<br />

shop_search.xml如下

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"        
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <LinearLayout android:id="@+id/dyna_list"
       
        android:layout_width="40dip" android:layout_height="40dip"
        android:layout_marginLeft="5dip" android:orientation="horizontal">

        <ImageView android:id="@+id/simple_list_item_icon_iv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center">
        </ImageView>

    </LinearLayout>

    <TextView android:id="@+id/simple_list_item_icon_tv"
        android:layout_width="fill_parent" android:layout_height="40dip"
        android:textColor="@drawable/black" android:textSize="12sp"
        android:paddingLeft="8dip" android:gravity ="center_vertical"
        android:singleLine="false" android:ellipsize="marquee">
    </TextView>
</LinearLayout>