最近在做一個Rss閱讀器，我看了一看別人做的閱讀器中的lisView可以伸縮，展開，我就在網上搜索了一下。果然讓我找到，下面就我找到的一個小例子，給大家分享一下。

ActivityMain .java

package com.android;

import android.app.ExpandableListActivity;

import android.os.Bundle;

import android.view.ContextMenu;

import android.view.MenuItem;

import android.view.View;

import android.view.ContextMenu.ContextMenuInfo;

import android.widget.ExpandableListAdapter;

import android.widget.ExpandableListView;

import android.widget.TextView;

import android.widget.Toast;

import android.widget.ExpandableListView.ExpandableListContextMenuInfo;

public class ActivityMain extends ExpandableListActivity {

private ExpandableListAdapter mAdapter;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

this.setTitle("ExpandableList");

mAdapter = new MyExpandableListAdapter(this);

setListAdapter(mAdapter);

registerForContextMenu(this.getExpandableListView());

}

//為列表的每一項創建上下文菜單(即長按后 呼出的菜單)

@Override

public void onCreateContextMenu(ContextMenu menu, View v,

ContextMenuInfo menuInfo) {

menu.setHeaderTitle("ContexMenu");

menu.add(0,0,0,"ContextMenu");

}

//單擊上下文菜單后的邏輯

@Override

public boolean onContextItemSelected(MenuItem item) {

ExpandableListContextMenuInfo info = (ExpandableListContextMenuInfo)item.getMenuInfo();

String title = ((TextView) info.targetView).getText().toString();

int type =ExpandableListView.getPackedPositionType(info.packedPosition);

if(type == ExpandableListView.PACKED_POSITION_TYPE_CHILD)

{

int groupPos = ExpandableListView.getPackedPositionGroup(info.packedPosition);

int childPos = ExpandableListView.getPackedPositionChild(info.packedPosition);

Toast.makeText(this, title+"-Group Index"+groupPos+"Child Index:"+childPos,

Toast.LENGTH_SHORT).show();

return true;

}

return false;

}

MyExpandableListAdapter.java

package com.android;

import android.content.Context;

import android.view.Gravity;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AbsListView;

import android.widget.BaseExpandableListAdapter;

import android.widget.TextView;

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

private Context mContext;

//父列表數據

private String[] groups ={"group1","group2","group3","group4",""};

//子列表數據

private String [][] children ={

{"child1"},

{"child1","child2"},

{"child1","child2","child3"},

{"child1","child2","child3","child4"},

};

MyExpandableListAdapter(Context context){

mContext = context;

}

@Override

public Object getChild(int groupPosition, int childPosition) {

// TODO Auto-generated method stub

return children[groupPosition][childPosition];

}

@Override

public long getChildId(int groupPosition, int childPosition) {

// TODO Auto-generated method stub

return childPosition;

}

//取子列表中的某一項的view

@Override

public View getChildView(int groupPosition, int childPosition,

boolean isLastChild, View convertView, ViewGroup parent) {

TextView textView = getGenericView();;

textView.setText(getChild(groupPosition, childPosition).toString());

return textView;

}

@Override

public int getChildrenCount(int groupPosition) {

// TODO Auto-generated method stub

return children[groupPosition].length;

}

@Override

public Object getGroup(int groupPosition) {

return groups[groupPosition];

}

@Override

public int getGroupCount() {

// TODO Auto-generated method stub

return groups.length;

}

@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) {

TextView textView = getGenericView();

textView.setText(getGroup(groupPosition).toString());

return textView;

}

@Override

public boolean hasStableIds() {

// TODO Auto-generated method stub

return true;

}

@Override

public boolean isChildSelectable(int groupPosition, int childPosition) {

// TODO Auto-generated method stub

return true;

}

//獲取某一項的view的邏輯

private TextView getGenericView(){

AbsListView.LayoutParams lp = new AbsListView.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,48);

TextView textView = new TextView(mContext);

textView.setLayoutParams(lp);

textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.LEFT);

textView.setPadding(32, 0, 0, 0);

return textView;

}

}

運行的結果如下：

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總結

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