ListView学习（二） 点击条目隐藏展开正文
本篇是listview条目点击展开或者隐藏内容，本文参照了android apiDemo写成，主要思想仍然普通的listview组件，listview条目下面有两个textview，第一个为标题、第二个为内容，根据点击标题来设置是否将写有内容的textView隐藏，下面我们就简单实现一下这个功能，原理和技术都很简单，这里就不多说了，下面就看代码，相信一看就会明白！
1、首先定义一个实体类：
public class Value {
?private String title;
?private String content;
?private boolean open;
set和get省略
}
?
2、主程序：
public class List1 extends ListActivity {
?List<Value> list;
?@Override
?public void onCreate(Bundle savedInstanceState) {
??super.onCreate(savedInstanceState);
??requestWindowFeature(Window.FEATURE_NO_TITLE);
??list = getList();
??setListAdapter(new SpeechListAdapter(this, list));
?}
?@Override
?protected void onListItemClick(ListView l, View v, int position, long id) {
??((SpeechListAdapter) getListAdapter()).changeOpen(position);
?}
?private class SpeechListAdapter extends BaseAdapter {
??List<Value> listValue;
??Context context;
??public SpeechListAdapter(Context context, List<Value> list) {
???this.context = context;
???this.listValue = list;
??}
??public int getCount() {
???return listValue.size();
??}
??public Object getItem(int position) {
???return position;
??}
??public long getItemId(int position) {
???return position;
??}
??public View getView(final int position, View convertView,
????ViewGroup parent) {
???final MyView mv;
???SpeechView sv;
???if (convertView == null) {
????sv = new SpeechView(context,
??????listValue.get(position).getTitle(), listValue.get(
????????position).getContent(),
??????listValue.get(position).isOpen());
???} else {
????sv = (SpeechView) convertView;
????sv.setTitle(listValue.get(position).getTitle());
????sv.setDialogue(listValue.get(position).getContent());
????sv.setExpanded(listValue.get(position).isOpen());
???}
???return sv;
??}
??public void changeOpen(int position) {
???listValue.get(position).setOpen(!listValue.get(position).isOpen());
???notifyDataSetChanged();
??}
?}
?private static class MyView {
??TextView tv1;
??TextView tv2;
?}
?public List<Value> getList() {
??List<Value> list = new ArrayList<Value>();
??Value value1 = new Value();
??value1.setTitle("第一条");
??value1.setContent("第一条内容");
??value1.setOpen(false);
??Value value2 = new Value();
??value2.setTitle("第二条");
??value2.setContent("第二条内容");
??value2.setOpen(false);
??Value value3 = new Value();
??value3.setTitle("第三条");
??value3.setContent("第三条内容");
??value3.setOpen(false);
??list.add(value1);
??list.add(value2);
??list.add(value3);
??return list;
?}
?private class SpeechView extends LinearLayout {
??public SpeechView(Context context, String title, String dialogue,
????boolean expanded) {
???super(context);
???mTitle = new TextView(context);
???mTitle.setText(title);
???mTitle.setBackgroundColor(Color.BLUE);
???mDialogue = new TextView(context);
???mDialogue.setPadding(10, 5, 10, 5);
???mDialogue.setBackgroundColor(Color.GREEN);
???mDialogue.setText(dialogue);
???mDialogue.setVisibility(expanded ? VISIBLE : GONE);
???LinearLayout bg = new LinearLayout(context);
???bg.setLayoutParams(new LinearLayout.LayoutParams(
?????LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
???bg.setBackgroundResource(R.drawable.menuitem_background);
???bg.addView(mTitle, new LinearLayout.LayoutParams(
?????LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
???bg.addView(mDialogue, new LinearLayout.LayoutParams(
?????LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
???bg.setOrientation(VERTICAL);
???addView(bg);
??}
??public void setTitle(String title) {
???mTitle.setText(title);
??}
??public void setDialogue(String words) {
???mDialogue.setText(words);
??}
??public void setExpanded(boolean expanded) {
???mDialogue.setVisibility(expanded ? VISIBLE : GONE);
??}
??private TextView mTitle;
??private TextView mDialogue;
?}
?
是不是很简单啊，现在把代码分享给大家（代码中还有一些别的效果）
