Android開發教程：使用ListView實現汽泡短信聊天

如這篇文章：http://www.linuxidc.com/Linux/2012-01/50686.htm

我們進行了SimpleAdapter適配器初次嘗試，那麼離實現我們最終想要的效果也不遠啦，只要仿照chata的布局，再編寫第二位聊天人（“路人甲”）的布局chatb——只要讓他靠右顯示就行~。

但是這樣我們每次都要很麻煩的定義一遍SimpleAdapter，為了“偷懶”，我們直接來編寫自己的Adapter，這樣每次定義就方便多了。

先附上最終的代碼：

1. public void onCreate(Bundle savedInstanceState) {
2. super.onCreate(savedInstanceState);
3. setContentView(R.layout.main);
4. chatlist = (ListView) findViewById(R.id.chatlist);
5. list = new ArrayList<ChatEntity>();
6. ChatEntity chat1=new ChatEntity("小魏","嗨~",R.layout.chata);
7. list.add(chat1);
8. ChatEntity chat2=new ChatEntity("路人甲","你好！",R.layout.chatb);
9. list.add(chat2);
10. ChatEntity chat3=new ChatEntity("小魏","我是小魏~",R.layout.chata);
11. list.add(chat3);
13. chatlist.setAdapter(new ChatAdapter(TryChatPop2Activity.this,list));
14. }

如上代碼，在setAdapter時使用了自己的ChatAdapter，以下是類文件代碼：

1. public class ChatAdapter implements ListAdapter{
2. private ArrayList<ChatEntity> list;
3. private Context ctx;
5. public ChatAdapter(Context context ,ArrayList<ChatEntity> list) {
6. ctx = context;
7. this.list = list;
8. }
10. public boolean areAllItemsEnabled() {
11. return false;
12. }
13. public boolean isEnabled(int arg0) {
14. return false;
15. }
16. public int getCount() {
17. return list.size();
18. }
19. public Object getItem(int position) {
20. return list.get(position);
21. }
22. public long getItemId(int position) {
23. return position;
24. }
25. public int getItemViewType(int position) {
26. return position;
27. }
28. public View getView(int position, View convertView, ViewGroup parent) {
29. ChatEntity entity = list.get(position);
30. int itemLayout = entity.getLayoutID();
32. LinearLayout layout = new LinearLayout(ctx);
33. LayoutInflater vi = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
34. vi.inflate(itemLayout, layout,true);
36. TextView txvName = (TextView) layout.findViewById(R.id.txvName);
37. txvName.setText(entity.getName());
39. TextView txvText = (TextView) layout.findViewById(R.id.txvInfo);
40. txvText.setText(entity.getInfo());
41. return layout;
42. }
43. public int getViewTypeCount() {
44. return list.size();
45. }
46. public boolean hasStableIds() {
47. return false;
48. }
49. public boolean isEmpty() {
50. return false;
51. }
52. public void registerDataSetObserver(DataSetObserver observer) {
53. }
54. public void unregisterDataSetObserver(DataSetObserver observer) {
55. }
57. }