ExpandableListView / ExpandableListActivity 使用及数据更新

ExpandableListView / ExpandableListActivity

二者关系 和 ListActivity / ListView 是一样的

1. 定义含有ExpandableListView 的布局:main.xml

<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>

2. 定义数据结构List<String>, List<List<String>> 分别用于存放 Group / Children 的String

List<String> group;
List<List<String>> child;

3. 初始化 List<String> List<List<String>> 并插入一些数据

public void initialData(){
    group = new ArrayList<String>();

    child = new ArrayList<List<String>>();

    addInfo("griffinshi", new String[]{"13776117119","man","Jiangsu"});
    addInfo("lancewu",new String[]{"1321134","man","Taiwan"});
    addInfo("kandyli",new String[]{"12345"});
}

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);
}

4. 定义BaseExpandableListAdapter 并与List<String> List<List<String>> 数据相适配

public class InfoDetailsAdapter extends BaseExpandableListAdapter {
    Activity activity;

    public InfoDetailsAdapter(Activity a){
        activity = a;
    }
        
    //child method stub
        
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        // TODO Auto-generated method stub
        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 int getGroupCount() {
        // TODO Auto-generated method stub
        return group.size();
    }

    @Override
    public long getGroupId(int groupPosition) {
        // TODO Auto-generated method stub
        return groupPosition;
    }

    @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;
    }

}

5. emulator 运行截图:

6. 下面说一下 数据更新 问题 包括:添加数据 删除数据

* 定义添加数据界面: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 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="姓名:"
    />
<EditText  
    android:id="@+id/add_name"
    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"
    >
<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 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="性别:"
    />
<EditText  
    android:id="@+id/add_sex"
    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"
    >
<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 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/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>

* add.xml 里 View 的定义:

public void createDialogAdd(){
    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();
                
            mAdapter.notifyDataSetChanged();
        }
    });
        
    add_no.setOnClickListener(new OnClickListener(){
        public void onClick(View v) {
            // TODO Auto-generated method stub
            dialogAdd.dismiss();
        }
    });
}

* 运行截图:

* 定义删除数据界面: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>

* delete.xml 里View 定义:

public void createDialogDelete(){
    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();

                mAdapter.notifyDataSetChanged();
            } 
  
        }
    });
        
    delete_no.setOnClickListener(new OnClickListener(){
        public void onClick(View v) {
            // TODO Auto-generated method stub
            dialogDelete.dismiss();
        }
    });
}

* 运行截图:

最后 说一下ExpandableListView的回调函数 用于监听那个id 被expand

expandList.setOnGroupClickListener(new OnGroupClickListener(){

    @Override
    public boolean onGroupClick(ExpandableListView arg0, View arg1, int arg2, long arg3) {
        // TODO Auto-generated method stub
        Toast.makeText(activity,"[Group Click]:"+arg2,Toast.LENGTH_LONG).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_LONG).show();
                
        return false;
    }
            
});

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