ListView 惯用方法

ListView 常用方法

ListView是比较常用的控件，但一直都觉得创建ListView步骤有点繁琐，故在此总结一下，方便查阅。

程序效果是实现一个ListView,ListView里面有标题，内容和图片，并加入点击和长按响应。

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首先在xml里面定义一个ListView

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1. <?xml?version="1.0"?encoding="utf-8"?>??
2. <LinearLayout???
3. ????android:id="@+id/LinearLayout01"???
4. ????android:layout_width="fill_parent"???
5. ????android:layout_height="fill_parent"???
6. ????xmlns:android="http://schemas.android.com/apk/res/android">??
7. <ListView?android:layout_width="wrap_content"???
8. ??????????android:layout_height="wrap_content"???
9. ??????????android:id="@+id/ListView01"??
10. ??????????/>??
11. </LinearLayout>??

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定义ListView每个条目的Layout，用RelativeLayout实现：

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1. <?xml?version="1.0"?encoding="utf-8"?>??
2. <RelativeLayout???
3. ????android:id="@+id/RelativeLayout01"???
4. ????android:layout_width="fill_parent"???
5. ????xmlns:android="http://schemas.android.com/apk/res/android"???
6. ????android:layout_height="wrap_content"???
7. ????android:paddingBottom="4dip"???
8. ????android:paddingLeft="12dip"??
9. ????android:paddingRight="12dip">??
10. <ImageView???
11. ????android:paddingTop="12dip"??
12. ????android:layout_alignParentRight="true"??
13. ????android:layout_width="wrap_content"???
14. ????android:layout_height="wrap_content"???
15. ????android:id="@+id/ItemImage"??
16. ????/>???
17. <TextView???
18. ????android:text="TextView01"???
19. ????android:layout_height="wrap_content"???
20. ????android:textSize="20dip"???
21. ????android:layout_width="fill_parent"???
22. ????android:id="@+id/ItemTitle"??
23. ????/>??
24. <TextView???
25. ????android:text="TextView02"???
26. ????android:layout_height="wrap_content"???
27. ????android:layout_width="fill_parent"???
28. ????android:layout_below="@+id/ItemTitle"???
29. ????android:id="@+id/ItemText"??
30. ????/>??
31. </RelativeLayout>??

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?最后在Activity里面调用和加入Listener,具体见注释：

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1. package?com.ray.test;??
2. ??
3. import?java.util.ArrayList;??
4. import?java.util.HashMap;??
5. ??
6. import?android.app.Activity;??
7. import?android.os.Bundle;??
8. import?android.view.ContextMenu;??
9. import?android.view.MenuItem;??
10. import?android.view.View;??
11. import?android.view.ContextMenu.ContextMenuInfo;??
12. import?android.view.View.OnCreateContextMenuListener;??
13. import?android.widget.AdapterView;??
14. import?android.widget.ListView;??
15. import?android.widget.SimpleAdapter;??
16. import?android.widget.AdapterView.OnItemClickListener;??
17. ??
18. public?class?TestListView?extends?Activity?{??
19. ????@Override??
20. ????public?void?onCreate(Bundle?savedInstanceState)?{??
21. ????????super.onCreate(savedInstanceState);??
22. ????????setContentView(R.layout.main);??
23. ????????//绑定Layout里面的ListView??
24. ????????ListView?list?=?(ListView)?findViewById(R.id.ListView01);??
25. ??????????
26. ????????//生成动态数组，加入数据??
27. ????????ArrayList<HashMap<String,?Object>>?listItem?=?new?ArrayList<HashMap<String,?Object>>();??
28. ????????for(int?i=0;i<10;i++)??
29. ????????{??
30. ????????????HashMap<String,?Object>?map?=?new?HashMap<String,?Object>();??
31. ????????????map.put("ItemImage",?R.drawable.checked);//图像资源的ID??
32. ????????????map.put("ItemTitle",?"Level?"+i);??
33. ????????????map.put("ItemText",?"Finished?in?1?Min?54?Secs,?70?Moves!?");??
34. ????????????listItem.add(map);??
35. ????????}??
36. ????????//生成适配器的Item和动态数组对应的元素??
37. ????????SimpleAdapter?listItemAdapter?=?new?SimpleAdapter(this,listItem,//数据源???
38. ????????????R.layout.list_items,//ListItem的XML实现??
39. ????????????//动态数组与ImageItem对应的子项??????????
40. ????????????new?String[]?{"ItemImage","ItemTitle",?"ItemText"},???
41. ????????????//ImageItem的XML文件里面的一个ImageView,两个TextView?ID??
42. ????????????new?int[]?{R.id.ItemImage,R.id.ItemTitle,R.id.ItemText}??
43. ????????);??
44. ?????????
45. ????????//添加并且显示??
46. ????????list.setAdapter(listItemAdapter);??
47. ??????????
48. ????????//添加点击??
49. ????????list.setOnItemClickListener(new?OnItemClickListener()?{??
50. ??
51. ????????????@Override??
52. ????????????public?void?onItemClick(AdapterView<?>?arg0,?View?arg1,?int?arg2,??
53. ????????????????????long?arg3)?{??
54. ????????????????setTitle("点击第"+arg2+"个项目");??
55. ????????????}??
56. ????????});??
57. ??????????
58. ??????//添加长按点击??
59. ????????list.setOnCreateContextMenuListener(new?OnCreateContextMenuListener()?{??
60. ??????????????
61. ????????????@Override??
62. ????????????public?void?onCreateContextMenu(ContextMenu?menu,?View?v,ContextMenuInfo?menuInfo)?{??
63. ????????????????menu.setHeaderTitle("长按菜单-ContextMenu");?????
64. ????????????????menu.add(0,?0,?0,?"弹出长按菜单0");??
65. ????????????????menu.add(0,?1,?0,?"弹出长按菜单1");?????
66. ????????????}??
67. ????????});???
68. ????}??
69. ??????
70. ????//长按菜单响应函数??
71. ????@Override??
72. ????public?boolean?onContextItemSelected(MenuItem?item)?{??
73. ????????setTitle("点击了长按菜单里面的第"+item.getItemId()+"个项目");???
74. ????????return?super.onContextItemSelected(item);??
75. ????}??
76. }