android:layout_width=“match_parent”
android:layout_height=“57dp”
android:background="#ffffff"
android:clickable=“true”
android:minHeight="?android:attr/listPreferredItemHeight" >
android:id="@+id/iv_group_icon" android:layout_width=“wrap_content” android:layout_height=“wrap_content” android:layout_alignParentLeft=“true” android:layout_centerVertical=“true” android:layout_marginLeft=“18dp” android:background="@drawable/ic_leftnav_10" /> android:id="@+id/tv_group_text" android:layout_width=“wrap_content” android:layout_height=“wrap_content” android:layout_centerVertical=“true” android:layout_marginLeft=“59dp” android:text=“时局” android:textColor="#333333" android:textSize=“16sp” /> android:id="@+id/item_group_devider" android:layout_width=“match_parent” android:layout_height=“0.5dp” android:layout_alignLeft="@+id/tv_group_text" android:layout_alignParentBottom=“true” android:background="@color/listview_divider" android:layout_marginRight=“10dp” android:visibility=“visible”/> a ndroid:id="@+id/iv_expand" android:layout_width=“wrap_content” android:layout_height=“wrap_content” android:layout_alignParentRight=“true” android:layout_centerVertical=“true” android:layout_marginRight=“25dp” android:clickable=“true” android:padding=“5dp” android:src="@drawable/ic_leftnav_down" /> layout/layout_expand_item.xml android:layout_width=“match_parent” android:layout_height=“40dp” android:background="@drawable/slidingmenu_item_selector" android:minHeight="?android:attr/listPreferredItemHeight" > android:id="@+id/tv_item_text" android:layout_width=“wrap_content” android:layout_height=“wrap_content” android:layout_centerVertical=“true” android:layout_marginLeft=“75dp” android:text=“时局” android:textColor="@drawable/slidingmenu_item_text_selector" android:textSize=“15sp” android:clickable=“true” /> android:id="@+id/item_devider" android:layout_width=“match_parent” android:layout_height=“0.5dp” android:layout_alignParentBottom=“true” android:layout_marginLeft=“59dp” android:layout_marginRight=“10dp” android:background="@color/listview_divider" android:visibility=“visible” /> 自定义Adapter - 继承baseExpandableListAdapter并实现以下方法 - getGroupCount（获取组项的个数） - getChildrenCount（获取子项个数） - getGroup（获取组对象） - getChild（获取子对象） - getGroupId（获取组项id） - getChildId（获取子项id） - hasStableIds（组和子元素是否持有稳定的ID） - getGroupView（获取显示指定组的视图对象） - getChildView（获取显示指定项的视图对象） - isChildSelectable（子项是否可选中） - 传入组项列表（如：List - 传入子项列表（如：List 适配器代码： com.devilwwj.androiddevelopcourse.adapters.ExpandableListViewAdapter package com.devilwwj.androiddevelopcourse.adapters; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.baseExpandableListAdapter; import android.widget.ExpandableListView; import android.widget.ImageView; import android.widget.RelativeLayout; import android.widget.TextView; import com.devilwwj.androiddevelopcourse.R; import com.devilwwj.androiddevelopcourse.domain.Category; import com.devilwwj.androiddevelopcourse.domain.GroupItem; import java.util.HashMap; import java.util.List; public class ExpandableListViewAdapter extends baseExpandableListAdapter { private Context mContext;// 上下文 private ExpandableListView expandableListView; // 可展开列表对象 private List groupList; // 组列表 private List private LayoutInflater inflater; // 自定义接口回调监听器 private onGroupExpandListener OnGroupExpandListener; private onGroupClickListener onGroupClickListener; private onChildItemClickListener onChildClickListener; private HashMap private boolean expandStateAtPosition = false; public onGroupClickListener getonGroupClickListener() { return onGroupClickListener; } public void setonGroupClickListener( onGroupClickListener onGroupClickListener) { this.onGroupClickListener = onGroupClickListener; } public onGroupExpandListener getonGroupExpandListener() { return OnGroupExpandListener; } public void setonGroupExpandListener( onGroupExpandListener onGroupExpandListener) { onGroupExpandListener = onGroupExpandListener; } public onChildItemClickListener getonChildClickListener() { return onChildClickListener; } public void setonChildClickListener( onChildItemClickListener onChildClickListener) { this.onChildClickListener = onChildClickListener; } private int mExpandedGroupPosition; public int getExpandedGroupPosition() { return mExpandedGroupPosition; } public void setExpandedGroupPosition(int mExpandedGroupPosition) { this.mExpandedGroupPosition = mExpandedGroupPosition; } public ExpandableListViewAdapter(Context context, ExpandableListView expandableListView, List groupList, List super(); this.mContext = context; this.expandableListView = expandableListView; this.groupList = groupList; this.childList = childList; inflater = LayoutInflater.from(context); // 初始化列表展开状态 for (int i = 0; i < groupList.size(); i++) { maps.put(i, false); } } private int mGroupPosition = 0; private int mChildPosition = 0; public void setItemChecked(int groupPosition, int childPosition) { if (expandableListView == null) { return; } this.mGroupPosition = groupPosition; this.mChildPosition = childPosition; int numberOfGroupThatIsOpened = 0; for (int i = 0; i < groupPosition; i++) { if (expandableListView.isGroupExpanded(i)) { numberOfGroupThatIsOpened += this.getChildrenCount(i); } } int position = numberOfGroupThatIsOpened + groupPosition if (!expandableListView.isItemChecked(position)) { expandableListView.setItemChecked(position, true); } } @Override public int getGroupCount() { return groupList.size(); } @Override public int getChildrenCount(int groupPosition) { return childList.get(groupPosition).size(); } @Override public GroupItem getGroup(int groupPosition) { return groupList.get(groupPosition); } @Override public Category getChild(int groupPosition, int childPosition) { return childList.get(groupPosition).get(childPosition); } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public boolean hasStableIds() { return false; } @Override public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { final GroupViewHolder groupViewHolder; if (convertView == null) { convertView = inflater.inflate(R.layout.layout_expand_group, parent, false); groupViewHolder = new GroupViewHolder(convertView); convertView.setTag(groupViewHolder); } else { groupViewHolder = (GroupViewHolder) convertView.getTag(); } GroupItem groupItem = groupList.get(groupPosition); groupViewHolder.itemGroupIcon.setBackgroundResource(groupItem .getDrawableId()); groupViewHolder.itemGroupText.setText(groupItem.getText()); // 如果该组没有子项，则不显示箭头 if (childList.get(groupPosition).size() == 0) { groupViewHolder.itemArrow.setVisibility(View.GONE); groupViewHolder.itemGroupLayout .setonClickListener(new onClickListener() { @Override public void onClick(View v) { onGroupClickListener.onGroupClick(groupPosition); } }); } else { groupViewHolder.itemArrow.setVisibility(View.VISIBLE); groupViewHolder.itemGroupLayout .setonClickListener(new onClickListener() { @Override public void onClick(View v) { OnGroupExpandListener.onGroupExpand(groupPosition); } }); } groupViewHolder.itemGroupText.setonClickListener(new onClickListener() { @Override public void onClick(View v) { onGroupClickListener.onGroupClick(groupPosition); } }); groupViewHolder.itemArrow.setonClickListener(new onClickListener() { @Override public void onClick(View v) { OnGroupExpandListener.onGroupExpand(groupPosition); } }); // 判断isExpanded就可以控制按下还是关闭，同时更换图片,这里使用属性动画来控制旋转 if (isExpanded) { groupViewHolder.itemArrow .setImageResource(R.drawable.ic_leftnav_up); // 没有孩子项就不隐藏分割线 if (childList.get(groupPosition).size() > 0) { groupViewHolder.itemDivider.setVisibility(View.INVISIBLE); } else { groupViewHolder.itemDivider.setVisibility(View.VISIBLE); } } else { groupViewHolder.itemArrow .setImageResource(R.drawable.ic_leftnav_down); groupViewHolder.itemDivider.setVisibility(View.VISIBLE); } return convertView; } @Override public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { final ChildViewHolder childViewHolder; if (convertView == null) { convertView = inflater.inflate(R.layout.layout_expand_item, parent, false); childViewHolder = new ChildViewHolder(convertView); convertView.setTag(childViewHolder); } else { childViewHolder = (ChildViewHolder) convertView.getTag(); } String content = childList.get(groupPosition).get(childPosition) .getTitle(); // 设置内容 childViewHolder.itemChildText.setText(content); // 设置文本点击事件 childViewHolder.itemChildText.setonClickListener(new onClickListener() { @Override public void onClick(View v) { onChildClickListener.onChildItemClick(groupPosition, childPosition); } }); if (childPosition == childList.get(groupPosition).size() - 1) { childViewHolder.itemDivider.setVisibility(View.VISIBLE); } else { childViewHolder.itemDivider.setVisibility(View.GONE); } // 设置子项被选中的状态 return convertView; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { // 设置孩子项可选中 return true; } private static class GroupViewHolder { RelativeLayout itemGroupLayout; ImageView itemGroupIcon; TextView itemGroupText; ImageView itemArrow; View itemDivider; public GroupViewHolder(View convertView) { itemGroupLayout = (RelativeLayout) convertView .findViewById(R.id.group_layout); itemGroupIcon = (ImageView) convertView .findViewById(R.id.iv_group_icon); itemGroupText = (TextView) convertView .findViewById(R.id.tv_group_text); itemArrow = (ImageView) convertView.findViewById(R.id.iv_expand); itemDivider = (View) convertView .findViewById(R.id.item_group_devider); } } private static class ChildViewHolder { TextView itemChildText; View itemDivider; public ChildViewHolder(View convertView) { itemChildText = (TextView) convertView .findViewById(R.id.tv_item_text); itemDivider = (View) convertView.findViewById(R.id.item_devider); } } public interface onGroupExpandListener { void onGroupExpand(int position); } public interface onGroupClickListener { void onGroupClick(int position); } public interface onChildItemClickListener { void onChildItemClick(int groupPosition, int childPosition); } public boolean getExpandStateAtPosition(int groupPosition) { // 获得当前位置的展开状态 expandStateAtPosition = maps.get(groupPosition).booleanValue(); return expandStateAtPosition; } public void setExpandStateAtPosition(int groupPosition, boolean expandStateAtPosition) { this.expandStateAtPosition = expandStateAtPosition; maps.put(groupPosition, expandStateAtPosition); } } 解析一下上面的代码，我们可以看到ExpandableListView除了一个组项，每个组项下面有若干个子项，我们在使用的时候首先要确定要展示的数据结构，组项有groupPosition来标识位置，然而子项需要根据groupPosition和ChildPosition来标识位置，我们设置数据的时候分别在getGroupView和getChildView方法来设置组视图和子项视图数据，最后返回填充数据的视图对象，一些逻辑控制的代码也是在这两个方法中进行，比如控制组项的展开、组项的点击、子项的点击、子项被选中效果等等，这里笔者是自定义了回调接口来满足业务的需求，Android API也提供的类似的方法，大家可以查看官方文档。 Activity代码 com.devilwwj.androiddevelopcourse.activities.ExpandableListViewTestActivity package com.devilwwj.androiddevelopcourse.activities; import android.content.Context; import android.os.Bundle; import android.support.v7.app.ActionBarActivity; import android.view.View; import android.widget.ExpandableListView; import com.devilwwj.androiddevelopcourse.R; import com.devilwwj.androiddevelopcourse.adapters.ExpandableListViewAdapter; import com.devilwwj.androiddevelopcourse.domain.Category; import com.devilwwj.androiddevelopcourse.domain.GroupItem; import com.devilwwj.androiddevelopcourse.utils.ResourceUtil; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.List; public class ExpandableListViewTestActivity extends ActionBarActivity implements ExpandableListViewAdapter.OnGroupClickListener, ExpandableListViewAdapter.OnGroupExpandListener《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》
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childList; // 子项列表
childList) {
