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）