2011.04.14——— android 可伸缩的listview 但不是ExpandableList

2011.04.14——— android 可伸缩的listview 但不是ExpandableList

这个activity的功能就类似于经常见到的js手风琴菜单一样的效果

activity代码：
package com.lp.activity;import java.util.List;import android.app.ListActivity;import android.content.Context;import android.graphics.Color;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.LinearLayout;import android.widget.ListView;import android.widget.TextView;import com.lp.bean.Help;import com.lp.dao.HelpDao;public class HelpActivity extends ListActivity {private HelpDao dao;private List<Help> helps;private boolean[] mExpanded;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);dao = new HelpDao(this);helps = dao.getAll();mExpanded = new boolean[helps.size()];for(int i=0;i<helps.size();i++){mExpanded[i] = false;}setListAdapter(new SpeechListAdapter(this));}@Overrideprotected void onListItemClick(ListView l, View v, int position, long id) {((SpeechListAdapter)getListAdapter()).toggle(position);}//定义一个LinearLayout 上下结构  下面的textview可显示可隐藏private class SpeechView extends LinearLayout {        public SpeechView(Context context, String title, String dialogue, boolean expanded) {            super(context);                        this.setOrientation(VERTICAL);                        // Here we build the child views in code. They could also have            // been specified in an XML file.                        mTitle = new TextView(context);            //mTitle.setTextColor(R.color.title);            mTitle.setTextColor(Color.RED);            mTitle.setTextSize(20);            mTitle.setText(title);            addView(mTitle, new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));                        mDialogue = new TextView(context);            mDialogue.setTextSize(15);            mDialogue.setText(dialogue);            addView(mDialogue, new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));                        mDialogue.setVisibility(expanded ? VISIBLE : GONE);        }                /**         * Convenience method to set the title of a SpeechView         */        public void setTitle(String title) {            mTitle.setText(title);        }                /**         * Convenience method to set the dialogue of a SpeechView         */        public void setDialogue(String words) {            mDialogue.setText(words);        }                /**         * Convenience method to expand or hide the dialogue         */        public void setExpanded(boolean expanded) {            mDialogue.setVisibility(expanded ? VISIBLE : GONE);        }                private TextView mTitle;        private TextView mDialogue;    }private class SpeechListAdapter extends BaseAdapter {        public SpeechListAdapter(Context context)        {            mContext = context;        }                /**         * The number of items in the list is determined by the number of speeches         * in our array.         *          * @see android.widget.ListAdapter#getCount()         */        public int getCount() {            return helps.size();        }        /**         * Since the data comes from an array, just returning         * the index is sufficent to get at the data. If we         * were using a more complex data structure, we         * would return whatever object represents one          * row in the list.         *          * @see android.widget.ListAdapter#getItem(int)         */        public Object getItem(int position) {            return position;        }        /**         * Use the array index as a unique id.         * @see android.widget.ListAdapter#getItemId(int)         */        public long getItemId(int position) {            return position;        }        /**         * Make a SpeechView to hold each row.         * @see android.widget.ListAdapter#getView(int, android.view.View, android.view.ViewGroup)         */        public View getView(int position, View convertView, ViewGroup parent) {        Help help = helps.get(position);        String name = help.getName();        String desc = help.getDescr();            SpeechView sv;            if (convertView == null) {                sv = new SpeechView(mContext, name, desc, mExpanded[position]);            } else {                sv = (SpeechView)convertView;                sv.setTitle(name);                sv.setDialogue(desc);                sv.setExpanded(mExpanded[position]);            }                        return sv;        }        public void toggle(int position) {            mExpanded[position] = !mExpanded[position];            notifyDataSetChanged();        }                /**         * Remember our context so we can use it when constructing views.         */        private Context mContext;                   }}
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