ExpandableListView的简单使用

来源：互联网发布：gettingoverit 知乎编辑：程序博客网时间：2024/06/06 11:44

ExpandableListView

是可以有二级的listview，先看效果图：

首先是布局文件，就一个控件就行了

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    tools:context="myapp.czw.com.ceshi.Main4Activity">   <ExpandableListView       android:id="@+id/main4_EXListview"       android:layout_width="match_parent"       android:layout_height="match_parent"      >   </ExpandableListView></LinearLayout>

然后是activity代码
package myapp.czw.com.ceshi;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ExpandableListView;import android.widget.Toast;public class Main4Activity extends AppCompatActivity {    private ExpandableListView expandableListView;    Toast mtoast=GongYongToast.mtoast;    private int[] logos = new int[]{            R.drawable.default1,            R.drawable.default2,            R.drawable.default3,            R.drawable.default1    };    private String[] armTypes = new String[]{"WORD", "EXCEL", "EMAIL", "PPT"};    private String[][] arms = new String[][]{            {"文档编辑", "文档排版", "文档处理", "文档打印"},            {"表格编辑", "表格排版", "表格处理", "表格打印"},            {"收发邮件", "管理邮箱", "登录登出", "注册绑定"},            {"演示编辑", "演示排版", "演示处理", "演示打印"},};    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main4);        expandableListView= (ExpandableListView) findViewById(R.id.main4_EXListview);        MyExpandableListAdapter myExpandableListAdapter=new MyExpandableListAdapter(this,logos,armTypes,arms);        expandableListView.setAdapter(myExpandableListAdapter);        expandableListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {            @Override            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {                if(mtoast!=null)                {                    mtoast.cancel();                    mtoast= Toast.makeText(Main4Activity.this,"你点击的\ngroupPosition="+groupPosition+",childPosition="                            +childPosition+"\n"+arms[groupPosition][childPosition], Toast.LENGTH_SHORT);                }                else                {                    mtoast=Toast.makeText(Main4Activity.this,"你点击的\ngroupPosition="+groupPosition+",childPosition="                            +childPosition+"\n"+arms[groupPosition][childPosition], Toast.LENGTH_SHORT);                }                mtoast.show();                return false;            }        });    }}

最后是适配器代码，适配器要重写的方法比较多；
package myapp.czw.com.ceshi;import android.content.Context;import android.database.DataSetObserver;import android.view.Gravity;import android.view.View;import android.view.ViewGroup;import android.widget.AbsListView;import android.widget.ExpandableListAdapter;import android.widget.ImageView;import android.widget.LinearLayout;import android.widget.TextView;/** * Created by Adminczw on 2016/11/26. */public class MyExpandableListAdapter implements ExpandableListAdapter{    Context context;    int[] logos ;    private String[] armTypes ;    private String[][] arms ;    public MyExpandableListAdapter(Context context, int[] logos, String[] armTypes, String[][] arms) {        this.context = context;        this.logos = logos;        this.armTypes = armTypes;        this.arms = arms;    }    @Override    public void registerDataSetObserver(DataSetObserver observer) {    }    @Override    public void unregisterDataSetObserver(DataSetObserver observer) {    }    @Override    public int getGroupCount() {        return armTypes.length;    }    @Override    public int getChildrenCount(int groupPosition) {        return arms[groupPosition].length;    }    @Override    public Object getGroup(int groupPosition) {        return armTypes[groupPosition];    }    @Override    public Object getChild(int groupPosition, int childPosition) {        return arms[groupPosition][childPosition];    }    @Override    public long getGroupId(int groupPosition) {        return groupPosition;    }    @Override    public long getChildId(int groupPosition, int childPosition) {        return childPosition;    }    @Override    public boolean hasStableIds() {        return true;    }    @Override    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {        LinearLayout ll = new LinearLayout(context);        ll.setOrientation(LinearLayout.HORIZONTAL);        ImageView logo = new ImageView(context);        logo.setImageResource(logos[groupPosition]);        logo.setPadding(80, 0, 0, 0);//让图片离父控件左边80,为了不让图片挡住自带的那个指示箭头        // setPadding(左,上,右,下)离父元素的距离        logo.setAdjustViewBounds(true);//android:adjustViewBounds是否保持宽高比。需要与maxWidth、MaxHeight一起使用，否则单独使用没有效果。        logo.setMaxWidth(300);        logo.setMaxHeight(300);        ll.addView(logo);        TextView textView = getTextView();//调用的是最下面的那个方法        textView.setText(getGroup(groupPosition).toString());        textView.setPadding(10, 0, 0, 0);        ll.addView(textView);        return ll;    }    @Override    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {        TextView textView = getTextView();        textView.setText(getChild(groupPosition, childPosition).toString());        return textView;    }    @Override    public boolean isChildSelectable(int groupPosition, int childPosition) {        return true;//这个为true,子item才可以点击    }    @Override    public boolean areAllItemsEnabled() {        return false;    }    @Override    public boolean isEmpty() {        return false;    }    @Override    public void onGroupExpanded(int groupPosition) {    }    @Override    public void onGroupCollapsed(int groupPosition) {    }    @Override    public long getCombinedChildId(long groupId, long childId) {        return 0;    }    @Override    public long getCombinedGroupId(long groupId) {        return 0;    }    private TextView getTextView() {        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, 100);        TextView textView = new TextView(context);        textView.setLayoutParams(lp);        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);        textView.setPadding(36, 0, 0, 0);//setPadding(左,上,右,下)离父元素的距离        textView.setTextSize(20);        return textView;    }}

以上都是自己比较简单的介绍，详情可以参看以下文章链接

https://my.oschina.net/yaowen424/blog/533092
http://www.2cto.com/kf/201207/142950.html

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