android ListView 自定义 BaseAdapter

先上效果图

 

由上面的效果图可以看出：页面中的LISTVIEW的每一项，都是由两个TEXTVIEW组成，初始化的时候，只显示第一个TEXTVIEW，在这里我们成为标题，而内容部分的setVisible属性为"GONE"。为Ite添加onClick监听器，在每次点击的时候，显示内容部分，这里需要调用BaseAdapter的notifyDataSetChanged()进行刷新显示。

 

代码部分：

 

 1 class MyLayout extends LinearLayout {

 2 

 3     private TextView mTitle;

 4     private TextView mWords;

 5 

 6     public MyLayout(Context context, String title, String words,

 7             boolean mVisible) {

 8         super(context);

 9         this.setOrientation(VERTICAL);

10 

11         mTitle = new TextView(context);

12         mTitle.setText(title);

13         addView(mTitle, new LinearLayout.LayoutParams(

14                 LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));

15 

16         mWords = new TextView(context);

17         mWords.setText(words);

18         addView(mWords, new LinearLayout.LayoutParams(

19                 LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));

20         mWords.setVisibility(mVisible ? View.VISIBLE : View.GONE);

21     }

22 

23     public void setTitle(String title) {

24         mTitle.setText(title);

25     }

26 

27     public void setWords(String words) {

28         mWords.setText(words);

29     }

30 

31     public void setWordsVisible(boolean mVisible) {

32         mWords.setVisibility(mVisible ? View.VISIBLE : View.GONE);

33     }

34 

35 }

MyLayout

 

* 继承 LinearLayout 在其中添加两个TextView，通过 mVisible ? View.VISIBLE : View.GONE 控制内容是否显示。Tips：这里并没有使用invisible属性。

 

 1 class MyBaseAdapter extends BaseAdapter {

 2     private String[] titles = { "标题一", "标题二", "标题三", "标题四", "标题五" };

 3     private String[] words = { "我是内容1，我是内容1", "我是内容2，我是内容2", "我是内容3，我是内容3",

 4             "我是内容4，我是内容4", "我是内容5，我是内容5" };

 5     private boolean[] flags = { false, false, false, false, false };

 6     private Context mContext;

 7 

 8     public MyBaseAdapter(Context context) {

 9         mContext = context;

10     }

11 

12     @Override

13     public int getCount() {

14         // TODO Auto-generated method stub

15         return titles.length;

16     }

17 

18     @Override

19     public Object getItem(int position) {

20         // TODO Auto-generated method stub

21         return position;

22     }

23 

24     @Override

25     public long getItemId(int position) {

26         // TODO Auto-generated method stub

27         return position;

28     }

29 

30     @Override

31     public View getView(int position, View convertView, ViewGroup parent) {

32         // TODO Auto-generated method stub

33         MyLayout mLayout;

34         if (convertView == null) {

35             mLayout = new MyLayout(mContext, titles[position], words[position],

36                     flags[position]);

37         }else{

38             mLayout = (MyLayout) convertView;

39             mLayout.setTitle(titles[position]);

40             mLayout.setWords(words[position]);

41             mLayout.setWordsVisible(flags[position]);

42         }

43         return mLayout;

44     }

45     

46     public void toggler(int position){

47         flags[position] = !flags[position];

48         notifyDataSetChanged(); 

49     }

50     

51     

52     

53 }

MyBaseAdapter

 

* 重写getView()方法，完成初始化 

 

 1 public class BaseAdapterActivity extends ListActivity {

 2 

 3     @Override

 4     protected void onCreate(Bundle savedInstanceState) {

 5         // TODO Auto-generated method stub

 6         super.onCreate(savedInstanceState);

 7         this.setListAdapter(new MyBaseAdapter(this));

 8     }

 9 

10     @Override

11     protected void onListItemClick(ListView l, View v, int position, long id) {

12         ((MyBaseAdapter)getListAdapter()).toggler(position);

13     }

14     

15 }

MainActivity