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 + ;
    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 = ; 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(, MENU_ADD, , "     添加        ");
        menu.add(, MENU_DELETE, , "     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, );
        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(, , , );
        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>