Android 动态添加删除ExpandableListView的item的例子

这个例子可以学习到如下几点: 
1.通过自定义Dialog(单独布局的xml文件进行弹出显示) 
2.通过menu点击监听添加,删除view中的items 
3.点击ExpandableListView中group和child的事件监听

下面是代码: 
1.ExpandableListViewStudy.Java

package cn.com.example;  
import java.util.ArrayList;  
import java.util.List;  
import android.app.Activity;  
import android.app.Dialog;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.Menu;  
import android.view.MenuItem;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.EditText;  
import android.widget.ExpandableListView;  
import android.widget.Toast;  
import android.widget.ExpandableListView.OnChildClickListener;  
import android.widget.ExpandableListView.OnGroupClickListener;  
public class ExpandableListViewStudy extends Activity {  
    public final static int MENU_ADD = Menu.FIRST;  
    public final static int MENU_DELETE = Menu.FIRST + 1;  
    ExpandableListView expandList;  
    InfoDetailsAdapter adapter;  
    Activity activity;  
    List<String> group;  
    List<List<String>> child;  
    // 初始化group child内容  
    public void initialData() {  
        group = new ArrayList<String>();  
        child = new ArrayList<List<String>>();  
        addInfo("group 1", new String[] { "one 1", "two 1", "three 1" });  
        addInfo("group 2", new String[] { "one 2", "two 2", "three 2" });  
        addInfo("group 3", new String[] { "one 3", "two 3", "three 3" });  
    }  
    public void addInfo(String p, String[] c) {  
        group.add(p);  
        List<String> item = new ArrayList<String>();  
        for (int i = 0; i < c.length; i++) {  
            item.add(c[i]);  
        }  
        child.add(item);  
    }  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        activity = this;  
        expandList = (ExpandableListView) findViewById(R.id.expandList);  
        // 初始化各级元素  
        initialData();  
        // 适配器内容  
        adapter = new InfoDetailsAdapter(this, group, child);  
        expandList.setAdapter(adapter);  
        expandList.setOnGroupClickListener(new OnGroupClickListener() {  
            @Override  
            public boolean onGroupClick(ExpandableListView arg0, View arg1,  
                    int arg2, long arg3) {  
                // TODO Auto-generated method stub  
                System.out.println("The row id of the group clicked" + arg3);  
                Toast.makeText(activity, "[Group Click]:" + arg2,  
                        Toast.LENGTH_SHORT).show();  
                return false;  
            }  
        });  
        expandList.setOnChildClickListener(new OnChildClickListener() {  
            @Override  
            public boolean onChildClick(ExpandableListView arg0, View arg1,  
                    int arg2, int arg3, long arg4) {  
                // TODO Auto-generated method stub  
                Toast.makeText(activity, "[Child Click]:" + arg2 + ":" + arg3,  
                        Toast.LENGTH_SHORT).show();  
                return false;  
            }  
        });  
    }  
    // 下述2个函数处理Menu按钮的事件  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // TODO Auto-generated method stub  
        menu.add(0, MENU_ADD, 0, "     添加        ");  
        menu.add(0, MENU_DELETE, 0, "     删除        ");  
        return super.onCreateOptionsMenu(menu);  
    }  
    public boolean onOptionsItemSelected(MenuItem item) {  
        switch (item.getItemId()) {  
        case MENU_ADD:  
            Log.i("", "FRIEND_ID");  
            createDialogAdd();  
            dialogAdd.show();  
            break;  
        case MENU_DELETE:  
            Log.i("", "FRIEND_ID");  
            createDialogDelete();  
            dialogDelete.show();  
            break;  
        }  
        return super.onOptionsItemSelected(item);  
    }  
    EditText add_name, add_phone, add_sex, add_home;  
    EditText delete_id;  
    Button add_ok, add_no;  
    Button delete_ok, delete_no;  
    Dialog dialogAdd, dialogDelete;  
    public void createDialogAdd() {  
        Log.i("", "createDialogAdd");  
        View viewAdd = this.getLayoutInflater().inflate(R.layout.add, null);  
        dialogAdd = new Dialog(this);  
        dialogAdd.setContentView(viewAdd);  
        dialogAdd.setTitle("输入新成员信息");  
        add_name = (EditText) viewAdd.findViewById(R.id.add_name);  
        add_phone = (EditText) viewAdd.findViewById(R.id.add_phone);  
        add_sex = (EditText) viewAdd.findViewById(R.id.add_sex);  
        add_home = (EditText) viewAdd.findViewById(R.id.add_home);  
        add_ok = (Button) viewAdd.findViewById(R.id.add_ok);  
        add_no = (Button) viewAdd.findViewById(R.id.add_no);  
        add_ok.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                String[] data = { add_phone.getText().toString(),  
                        add_sex.getText().toString(),  
                        add_home.getText().toString() };  
                addInfo(add_name.getText().toString(), data);  
                dialogAdd.dismiss();  
                adapter.notifyDataSetChanged();  
            }  
        });  
        add_no.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                dialogAdd.dismiss();  
            }  
        });  
    }  
    public void createDialogDelete() {  
        View viewDelete = this.getLayoutInflater().inflate(R.layout.delete,  
                null);  
        dialogDelete = new Dialog(this);  
        dialogDelete.setContentView(viewDelete);  
        dialogDelete.setTitle("删除指定成员");  
        delete_id = (EditText) viewDelete.findViewById(R.id.delete_id);  
        delete_ok = (Button) viewDelete.findViewById(R.id.delete_ok);  
        delete_no = (Button) viewDelete.findViewById(R.id.delete_no);  
        delete_ok.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                String id = delete_id.getText().toString();  
                if (!id.equals("")) {  
                    int i = Integer.parseInt(id);  
                    group.remove(i);  
                    child.remove(i);  
                    dialogDelete.dismiss();  
                    adapter.notifyDataSetChanged();  
                }  
            }  
        });  
        delete_no.setOnClickListener(new OnClickListener() {  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                dialogDelete.dismiss();  
            }  
        });  
    }  
}  

2.InfoDetailsAdapter.java(适配器文件,用于提供给View内容)

package cn.com.example;  
import java.util.List;  
import android.app.Activity;  
import android.view.Gravity;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.AbsListView;  
import android.widget.BaseExpandableListAdapter;  
import android.widget.TextView;  
//为expandable list view 提供内容的基类  
public class InfoDetailsAdapter extends BaseExpandableListAdapter {  
    Activity activity;  
    List<String> group;  
    List<List<String>> child;  
    public InfoDetailsAdapter(Activity a, List<String> group,  
            List<List<String>> child) {  
        activity = a;  
        this.group = group;  
        this.child = child;  
    }  
    // child method stub  
    @Override  
    public Object getChild(int groupPosition, int childPosition) {  
        // TODO Auto-generated method stub  
        // System.out.println("*******************"+child.get(groupPosition).get(childPosition));  
        return child.get(groupPosition).get(childPosition);  
    }  
    @Override  
    public long getChildId(int groupPosition, int childPosition) {  
        // TODO Auto-generated method stub  
        return childPosition;  
    }  
    @Override  
    public int getChildrenCount(int groupPosition) {  
        // TODO Auto-generated method stub  
        return child.get(groupPosition).size();  
    }  
    @Override  
    public View getChildView(int groupPosition, int childPosition,  
            boolean isLastChild, View convertView, ViewGroup parent) {  
        // TODO Auto-generated method stub  
        String string = child.get(groupPosition).get(childPosition);  
        return getGenericView(string);  
    }  
    // group method stub  
    @Override  
    public Object getGroup(int groupPosition) {  
        // TODO Auto-generated method stub  
        return group.get(groupPosition);  
    }  
    @Override  
    public long getGroupId(int groupPosition) {  
        // TODO Auto-generated method stub  
        return groupPosition;  
    }  
    @Override  
    public int getGroupCount() {  
        // TODO Auto-generated method stub  
        return group.size();  
    }  
    @Override  
    public View getGroupView(int groupPosition, boolean isExpanded,  
            View convertView, ViewGroup parent) {  
        // TODO Auto-generated method stub  
        String string = group.get(groupPosition);  
        return getGenericView(string);  
    }  
    // View stub to create Group/Children 's View  
    public TextView getGenericView(String s) {  
        // Layout parameters for the ExpandableListView  
        AbsListView.LayoutParams lp = new AbsListView.LayoutParams(  
                ViewGroup.LayoutParams.FILL_PARENT, 64);  
        TextView text = new TextView(activity);  
        text.setLayoutParams(lp);  
        // Center the text vertically  
        text.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);  
        // Set the text starting position  
        text.setPadding(36, 0, 0, 0);  
        text.setText(s);  
        return text;  
    }  
    @Override  
    public boolean hasStableIds() {  
        // TODO Auto-generated method stub  
        return false;  
    }  
    @Override  
    public boolean isChildSelectable(int groupPosition, int childPosition) {  
        // TODO Auto-generated method stub  
        return true;  
    }  
}  

至于里面的方法各自起什么作用,可以自己进行测试

3.main.xml布局文件

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical" android:layout_width="fill_parent"  
    android:layout_height="fill_parent" android:id="@+id/layout">  
    <ExpandableListView android:id="@+id/expandList"  
        android:layout_width="fill_parent" android:layout_height="wrap_content" />  
</LinearLayout>  

4.add.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical" android:layout_width="fill_parent"  
    android:layout_height="fill_parent">  
    <LinearLayout android:orientation="horizontal"  
        android:layout_width="wrap_content" android:layout_height="wrap_content">  
        <TextView android:layout_width="wrap_content"  
            android:layout_height="wrap_content" android:text="姓名:" />  
        <EditText android:id="@+id/add_name" android:layout_width="200dip"  
            android:layout_height="wrap_content" />  
    </LinearLayout>  
    <LinearLayout android:orientation="horizontal"  
        android:layout_width="wrap_content" android:layout_height="wrap_content">  
        <TextView android:layout_width="wrap_content"  
            android:layout_height="wrap_content" android:text="电话:" />  
        <EditText android:id="@+id/add_phone" android:layout_width="200dip"  
            android:layout_height="wrap_content" />  
    </LinearLayout>  
    <LinearLayout android:orientation="horizontal"  
        android:layout_width="wrap_content" android:layout_height="wrap_content">  
        <TextView android:layout_width="wrap_content"  
            android:layout_height="wrap_content" android:text="性别:" />  
        <EditText android:id="@+id/add_sex" android:layout_width="200dip"  
            android:layout_height="wrap_content" />  
    </LinearLayout>  
    <LinearLayout android:orientation="horizontal"  
        android:layout_width="wrap_content" android:layout_height="wrap_content">  
        <TextView android:layout_width="wrap_content"  
            android:layout_height="wrap_content" android:text="住址:" />  
        <EditText android:id="@+id/add_home" android:layout_width="200dip"  
            android:layout_height="wrap_content" />  
    </LinearLayout>  
    <LinearLayout android:orientation="horizontal"  
        android:layout_width="wrap_content" android:layout_height="wrap_content">  
        <Button android:id="@+id/add_ok" android:layout_width="90dip"  
            android:layout_height="wrap_content" android:text="OK" />  
        <Button android:id="@+id/add_no" android:layout_width="90dip"  
            android:layout_height="wrap_content" android:text="NO" />  
    </LinearLayout>  
</LinearLayout>  

这个布局可以优化一下

5.delete.xml

<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical" android:layout_width="fill_parent"  
    android:layout_height="fill_parent">  
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
        android:orientation="horizontal" android:layout_width="wrap_content"  
        android:layout_height="wrap_content">  
        <TextView android:layout_width="wrap_content"  
            android:layout_height="wrap_content" android:text="ID:" />  
        <EditText android:id="@+id/delete_id" android:layout_width="200dip"  
            android:layout_height="wrap_content" />  
    </LinearLayout>  
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
        android:orientation="horizontal" android:layout_width="wrap_content"  
        android:layout_height="wrap_content">  
        <Button android:id="@+id/delete_ok" android:layout_width="90dip"  
            android:layout_height="wrap_content" android:text="OK" />  
        <Button android:id="@+id/delete_no" android:layout_width="90dip"  
            android:layout_height="wrap_content" android:text="NO" />  
    </LinearLayout>  
</LinearLayout>