ExpandableListActivity实现展开或隐藏子项

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

 

 

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>