在Android开发中，列表可以说是最常见的了，一般都是使用ListView，当涉及到二维数组时，更多的使用到ExpandableListView，然而当数据结构比较复杂时，就需要使用三级菜单或者更多级的菜单来显示，这就让人比较头疼了，最近做的项目就涉及到了三级菜单，遇到了不少问题，虽然不够完美，但是基本需求实现了，在此记录一下。（之前见过有人使用ListView实现4级、5级甚至更多级菜单的，是在Adapter的数据源里定义的结构，根据等级缩进左间距的倍数，链接地址找不到了，有兴趣的可以自己找找）
先上效果图：
简单介绍下重点，为了简便，把第一层ExpandableListView称之为EListOne，相应的Adapter称之为AdpOne；第二层ExpandableListView称之为EListTwo，相应的Adapter称之为AdpTwo。
首先第一个要处理的问题是在AdpOne的getChildView方法中，需要对EListTwo的高度进行动态计算，因为EListTwo展开和关闭时高度是不一样的，所以要在EListTwo的setOnGroupExpandListener和setOnGroupCollapseListener方法中做相应的处理：
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/** * @author Apathy、恒 * * 子ExpandableListView展开时，因为group只有一项，所以子ExpandableListView的总高度= * （子ExpandableListView的child数量 + 1 ）* 每一项的高度 * */ eListView.setOnGroupExpandListener(new OnGroupExpandListener() { @Override public void onGroupExpand(int groupPosition) { LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, (child.getChildNames().size() + 1)* (int) mContext.getResources().getDimension(R.dimen.parent_expandable_list_height)); eListView.setLayoutParams(lp); } }); /** * @author Apathy、恒 * * 子ExpandableListView关闭时，此时只剩下group这一项，所以子ExpandableListView的总高度即为一项的高度 * */ eListView.setOnGroupCollapseListener(new OnGroupCollapseListener() { @Override public void onGroupCollapse(int groupPosition) { LayoutParams lp = new LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, (int) mContext .getResources().getDimension( R.dimen.parent_expandable_list_height)); eListView.setLayoutParams(lp); } }); |
只展示菜单肯定不是我们的最终需求，我们一般需要点击菜单后进行相应的界面跳转或者数据处理，所以就需要获取所点击的菜单精确下标，获取方法很简单，只需要定义一个接口，在AdpOne的getChildView方法中回调即可：
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/** * @author Apathy、恒 * * 点击子ExpandableListView子项时，调用回调接口 * */ eListView.setOnChildClickListener(new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView arg0, View arg1, int groupIndex, int childIndex, long arg4) { if (mTreeViewClickListener != null) { mTreeViewClickListener.onClickPosition(groupPosition, childPosition, childIndex); } return false; } }); |
下面是完整的代码：
MainActivity.java：
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package com.heng.tree; import java.util.ArrayList; import com.heng.tree.R;import com.heng.tree.adapter.ParentAdapter;import com.heng.tree.adapter.ParentAdapter.OnChildTreeViewClickListener;import com.heng.tree.entity.ChildEntity;import com.heng.tree.entity.ParentEntity; import android.app.Activity;import android.content.Context;import android.graphics.Color;import android.os.Bundle;import android.widget.ExpandableListView;import android.widget.ExpandableListView.OnGroupExpandListener;import android.widget.Toast; /** * * @author Apathy、恒 * * <br/> * * @email shexiaoheng@163.com * * @blog * <a href='http://blog.csdn.net/shexiaoheng'>http://blog.csdn.net/shexiaoheng</a > * * <br/> * <br/> * * @Detail 本Demo为ExpandableListView嵌套ExpandableListView实现三级菜单的例子 * * #ParentAdapter.OnChildTreeViewClickListener * * */public class MainActivity extends Activity implements OnGroupExpandListener, OnChildTreeViewClickListener { private Context mContext; private ExpandableListView eList; private ArrayList<ParentEntity> parents; private ParentAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mContext = this; setContentView(R.layout.activity_main); loadData(); initEList(); } /** * @author Apathy、恒 * * 初始化菜单数据源 * */ private void loadData() { parents = new ArrayList<ParentEntity>(); for (int i = 0; i < 10; i++) { ParentEntity parent = new ParentEntity(); parent.setGroupName("父类父分组第" + i + "项"); parent.setGroupColor(getResources().getColor( android.R.color.holo_red_light)); ArrayList<ChildEntity> childs = new ArrayList<ChildEntity>(); for (int j = 0; j < 8; j++) { ChildEntity child = new ChildEntity(); child.setGroupName("子类父分组第" + j + "项"); child.setGroupColor(Color.parseColor("#ff00ff")); ArrayList<String> childNames = new ArrayList<String>(); ArrayList<Integer> childColors = new ArrayList<Integer>(); for (int k = 0; k < 5; k++) { childNames.add("子类第" + k + "项"); childColors.add(Color.parseColor("#ff00ff")); } child.setChildNames(childNames); childs.add(child); } parent.setChilds(childs); parents.add(parent); } } /** * @author Apathy、恒 * * 初始化ExpandableListView * */ private void initEList() { eList = (ExpandableListView) findViewById(R.id.eList); eList.setOnGroupExpandListener(this); adapter = new ParentAdapter(mContext, parents); eList.setAdapter(adapter); adapter.setOnChildTreeViewClickListener(this); } /** * @author Apathy、恒 * * 点击子ExpandableListView的子项时，回调本方法，根据下标获取值来做相应的操作 * */ @Override public void onClickPosition(int parentPosition, int groupPosition, int childPosition) { // do something String childName = parents.get(parentPosition).getChilds() .get(groupPosition).getChildNames().get(childPosition) .toString(); Toast.makeText( mContext, "点击的下标为： parentPosition=" + parentPosition + " groupPosition=" + groupPosition + " childPosition=" + childPosition + "\n点击的是：" + childName, Toast.LENGTH_SHORT).show(); } /** * @author Apathy、恒 * * 展开一项，关闭其他项，保证每次只能展开一项 * */ @Override public void onGroupExpand(int groupPosition) { for (int i = 0; i < parents.size(); i++) { if (i != groupPosition) { eList.collapseGroup(i); } } } } |
ParentAdapter.java
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package com.heng.tree.adapter; import java.util.ArrayList; import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.ExpandableListView;import android.widget.ExpandableListView.OnChildClickListener;import android.widget.ExpandableListView.OnGroupCollapseListener;import android.widget.ExpandableListView.OnGroupExpandListener;import android.widget.AbsListView.LayoutParams;import android.widget.TextView; import com.heng.tree.R;import com.heng.tree.entity.ChildEntity;import com.heng.tree.entity.ParentEntity; /** * * @author Apathy、恒 * * 父类分组的适配器 * * <br/> * <br/> * * 方法 {@link #getChildView(int, int, boolean, View, ViewGroup)}<b><font * color='#ff00ff' size='2'>极其重要</font></b> * * */ public class ParentAdapter extends BaseExpandableListAdapter { private Context mContext;// 上下文 private ArrayList<ParentEntity> mParents;// 数据源 private OnChildTreeViewClickListener mTreeViewClickListener;// 点击子ExpandableListView子项的监听 public ParentAdapter(Context context, ArrayList<ParentEntity> parents) { this.mContext = context; this.mParents = parents; } @Override public ChildEntity getChild(int groupPosition, int childPosition) { return mParents.get(groupPosition).getChilds().get(childPosition); } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public int getChildrenCount(int groupPosition) { return mParents.get(groupPosition).getChilds() != null ? mParents .get(groupPosition).getChilds().size() : 0; } @Override public View getChildView(final int groupPosition, final int childPosition, boolean isExpanded, View convertView, ViewGroup parent) { final ExpandableListView eListView = getExpandableListView(); ArrayList<ChildEntity> childs = new ArrayList<ChildEntity>(); final ChildEntity child = getChild(groupPosition, childPosition); childs.add(child); final ChildAdapter childAdapter = new ChildAdapter(this.mContext, childs); eListView.setAdapter(childAdapter); /** * @author Apathy、恒 * * 点击子ExpandableListView子项时，调用回调接口 * */ eListView.setOnChildClickListener(new OnChildClickListener() { @Override public boolean onChildClick(ExpandableListView arg0, View arg1, int groupIndex, int childIndex, long arg4) { if (mTreeViewClickListener != null) { mTreeViewClickListener.onClickPosition(groupPosition, childPosition, childIndex); } return false; } }); /** * @author Apathy、恒 * * 子ExpandableListView展开时，因为group只有一项，所以子ExpandableListView的总高度= * （子ExpandableListView的child数量 + 1 ）* 每一项的高度 * */ eListView.setOnGroupExpandListener(new OnGroupExpandListener() { @Override public void onGroupExpand(int groupPosition) { LayoutParams lp = new LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, (child .getChildNames().size() + 1) * (int) mContext.getResources().getDimension( R.dimen.parent_expandable_list_height)); eListView.setLayoutParams(lp); } }); /** * @author Apathy、恒 * * 子ExpandableListView关闭时，此时只剩下group这一项， * 所以子ExpandableListView的总高度即为一项的高度 * */ eListView.setOnGroupCollapseListener(new OnGroupCollapseListener() { @Override public void onGroupCollapse(int groupPosition) { LayoutParams lp = new LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, (int) mContext .getResources().getDimension( R.dimen.parent_expandable_list_height)); eListView.setLayoutParams(lp); } }); return eListView; } /** * @author Apathy、恒 * * 动态创建子ExpandableListView * */ public ExpandableListView getExpandableListView() { ExpandableListView mExpandableListView = new ExpandableListView( mContext); LayoutParams lp = new LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, (int) mContext .getResources().getDimension( R.dimen.parent_expandable_list_height)); mExpandableListView.setLayoutParams(lp); mExpandableListView.setDividerHeight(0);// 取消group项的分割线 mExpandableListView.setChildDivider(null);// 取消child项的分割线 mExpandableListView.setGroupIndicator(null);// 取消展开折叠的指示图标 return mExpandableListView; } @Override public Object getGroup(int groupPosition) { return mParents.get(groupPosition); } @Override public int getGroupCount() { return mParents != null ? mParents.size() : 0; } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { GroupHolder holder = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate( R.layout.parent_group_item, null); holder = new GroupHolder(convertView); convertView.setTag(holder); } else { holder = (GroupHolder) convertView.getTag(); } holder.update(mParents.get(groupPosition)); return convertView; } /** * @author Apathy、恒 * * Holder优化 * */ class GroupHolder { private TextView parentGroupTV; public GroupHolder(View v) { parentGroupTV = (TextView) v.findViewById(R.id.parentGroupTV); } public void update(ParentEntity model) { parentGroupTV.setText(model.getGroupName()); parentGroupTV.setTextColor(model.getGroupColor()); } } @Override public boolean hasStableIds() { return false; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { return false; } /** * @author Apathy、恒 * * 设置点击子ExpandableListView子项的监听 * */ public void setOnChildTreeViewClickListener( OnChildTreeViewClickListener treeViewClickListener) { this.mTreeViewClickListener = treeViewClickListener; } /** * @author Apathy、恒 * * 点击子ExpandableListView子项的回调接口 * */ public interface OnChildTreeViewClickListener { void onClickPosition(int parentPosition, int groupPosition, int childPosition); } } |
ChildAdapter.java
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package com.heng.tree.adapter; import java.util.ArrayList; import com.heng.tree.R;import com.heng.tree.entity.ChildEntity; import android.content.Context;import android.graphics.Color;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.TextView; /** * * @author Apathy、恒 * * <br/> * <br/> * * 子类分组的适配器 * * <br/> * <br/> * * 方法{@link #isChildSelectable(int,int)} <b><font color='#ff00ff' * size='2'>必须返回true</font></b> * * */public class ChildAdapter extends BaseExpandableListAdapter { private Context mContext;// 上下文 private ArrayList<ChildEntity> mChilds;// 数据源 public ChildAdapter(Context context, ArrayList<ChildEntity> childs) { this.mContext = context; this.mChilds = childs; } @Override public int getChildrenCount(int groupPosition) { return mChilds.get(groupPosition).getChildNames() != null ? mChilds .get(groupPosition).getChildNames().size() : 0; } @Override public String getChild(int groupPosition, int childPosition) { if (mChilds.get(groupPosition).getChildNames() != null && mChilds.get(groupPosition).getChildNames().size() > 0) return mChilds.get(groupPosition).getChildNames() .get(childPosition).toString(); return null; } @Override public long getChildId(int groupPosition, int childPosition) { return childPosition; } @Override public View getChildView(int groupPosition, int childPosition, boolean isExpanded, View convertView, ViewGroup parent) { ChildHolder holder = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate( R.layout.child_child_item, null); holder = new ChildHolder(convertView); convertView.setTag(holder); } else { holder = (ChildHolder) convertView.getTag(); } holder.update(getChild(groupPosition, childPosition)); return convertView; } /** * @author Apathy、恒 * * Holder优化 * */ class ChildHolder { private TextView childChildTV; public ChildHolder(View v) { childChildTV = (TextView) v.findViewById(R.id.childChildTV); } public void update(String str) { childChildTV.setText(str); childChildTV.setTextColor(Color.parseColor("#00ffff")); } } @Override public Object getGroup(int groupPosition) { if (mChilds != null && mChilds.size() > 0) return mChilds.get(groupPosition); return null; } @Override public int getGroupCount() { return mChilds != null ? mChilds.size() : 0; } @Override public long getGroupId(int groupPosition) { return groupPosition; } @Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { GroupHolder holder = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate( R.layout.child_group_item, null); holder = new GroupHolder(convertView); convertView.setTag(holder); } else { holder = (GroupHolder) convertView.getTag(); } holder.update(mChilds.get(groupPosition)); return convertView; } /** * @author Apathy、恒 * * Holder优化 * */ class GroupHolder { private TextView childGroupTV; public GroupHolder(View v) { childGroupTV = (TextView) v.findViewById(R.id.childGroupTV); } public void update(ChildEntity model) { childGroupTV.setText(model.getGroupName()); childGroupTV.setTextColor(model.getGroupColor()); } } @Override public boolean hasStableIds() { return false; } @Override public boolean isChildSelectable(int groupPosition, int childPosition) { /** * ============================================== * 此处必须返回true，否则无法响应子项的点击事件=============== * ============================================== **/ return true; } } |
CListAdapter.java
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package com.heng.tree.adapter; import java.util.ArrayList; import com.heng.tree.R;import com.heng.tree.entity.ChildEntity; import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView; /** * * @author Apathy、恒 * * 子类子类列表的适配器 * * */public class CListAdapter extends BaseAdapter { private Context mContext; private ArrayList<ChildEntity> mChilds; public CListAdapter(Context context, ArrayList<ChildEntity> childs) { this.mContext = context; this.mChilds = childs; } @Override public int getCount() { return mChilds != null ? mChilds.size() : 0; } @Override public Object getItem(int position) { if ((getCount() > 0) && (position > 0 && position < mChilds.size())) { return mChilds.get(position); } return null; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { Holder holder = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate( R.layout.child_child_item, null); holder = new Holder(convertView); convertView.setTag(holder); } else { holder = (Holder) convertView.getTag(); } holder.update(mChilds.get(position).getGroupName()); return convertView; } class Holder { private TextView tv; public Holder(View v) { tv = (TextView) v.findViewById(R.id.childChildTV); } public void update(String text) { tv.setText(text); } }} |
ParentEntity.java
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package com.heng.tree.entity; import java.util.ArrayList; /** * * @author Apathy、恒 * * 子类分组的实体 * * */ public class ParentEntity { private int groupColor; private String groupName; private ArrayList<ChildEntity> childs; /* ========================================================== * ======================= get method ======================= * ========================================================== */ public int getGroupColor() { return groupColor; } public String getGroupName() { return groupName; } public ArrayList<ChildEntity> getChilds() { return childs; } /* ========================================================== * ======================= set method ======================= * ========================================================== */ public void setGroupColor(int groupColor) { this.groupColor = groupColor; } public void setGroupName(String groupName) { this.groupName = groupName; } public void setChilds(ArrayList<ChildEntity> childs) { this.childs = childs; } } |
ChildEntity.java
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package com.heng.tree.entity; import java.util.ArrayList; /** * * @author Apathy、恒 * * 父类分组的实体 * * */ public class ChildEntity { private int groupColor; private String groupName; private ArrayList<String> childNames; /* ========================================================== * ======================= get method ======================= * ========================================================== */ public int getGroupColor() { return groupColor; } public String getGroupName() { return groupName; } public ArrayList<String> getChildNames() { return childNames; } /* ========================================================== * ======================= set method ======================= * ========================================================== */ public void setGroupColor(int groupColor) { this.groupColor = groupColor; } public void setGroupName(String groupName) { this.groupName = groupName; } public void setChildNames(ArrayList<String> childNames) { this.childNames = childNames; } } |
activity_main.xml
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<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <ExpandableListView android:id="@+id/eList" android:layout_width="match_parent" android:layout_height="match_parent" android:groupIndicator="@null" /> </FrameLayout> |
parent_group_item.xml
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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:paddingLeft="@dimen/parent_expandable_list_group_padding_left" > <TextView android:id="@+id/parentGroupTV" android:layout_width="wrap_content" android:layout_height="@dimen/parent_expandable_list_height" android:gravity="center_vertical" /> </RelativeLayout> |
child_group_item.xml
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" > <RelativeLayout android:layout_width="match_parent" android:layout_height="@dimen/parent_expandable_list_height" > <TextView android:id="@+id/childGroupTV" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:paddingLeft="@dimen/child_expandable_list_group_padding_left" /> </RelativeLayout> </LinearLayout> |
child_child_item.xml
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" > <RelativeLayout android:layout_width="match_parent" android:layout_height="@dimen/parent_expandable_list_height" > <TextView android:id="@+id/childChildTV" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerVertical="true" android:paddingLeft="@dimen/child_expandable_list_child_padding_left" /> </RelativeLayout> </LinearLayout> |
dimens.xml
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<resources> <!-- Default screen margins, per the Android Design guidelines. --> <dimen name="parent_expandable_list_height">50dp</dimen> <dimen name="parent_expandable_list_group_padding_left">10dp</dimen> <dimen name="child_expandable_list_group_padding_left">40dp</dimen> <dimen name="child_expandable_list_child_padding_left">75dp</dimen> </resources> |
点此下载demo
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/shexiaoheng/article/details/41351247
