android开发之Spinner组件

android开发之Spinner组件

Spinner组件组要用显示一个下拉列表，在使用中需要用到适配器Adapter，下面是一个该组件的使用示例

首先是布局文件main.xml：

Java代码

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical"android:layout_width="fill_parent"
4. android:layout_height="fill_parent">
5. <Spinnerandroid:id="@+id/spinner1"android:layout_width="fill_parent"
6. android:layout_height="wrap_content"/>
7. <Spinnerandroid:id="@+id/spinner2"android:layout_width="fill_parent"
8. android:layout_height="wrap_content"android:layout_marginTop="20dp"/>
9. </LinearLayout>

由于用到simpAdapter所以要写子项Item的布局如下 item。xml：

Java代码

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="horizontal"android:layout_width="fill_parent"
4. android:layout_height="wrap_content">
5. <ImageViewandroid:id="@+id/ivLogo"android:layout_width="60dp"
6. android:layout_height="60dp"android:src="@drawable/icon"
7. android:paddingLeft="10dp"/>
9. <TextViewandroid:id="@+id/tvApplicationName"android:textColor="#000"
10. android:layout_width="wrap_content"android:layout_height="fill_parent"
11. android:textSize="16dp"android:gravity="center_vertical"
12. android:paddingLeft="10dp"/>
14. </LinearLayout>

下面是代码：

Java代码

1. importjava.util.ArrayList;
2. importjava.util.HashMap;
3. importjava.util.List;
4. importjava.util.Map;
5. importandroid.app.Activity;
6. importandroid.app.AlertDialog;
7. importandroid.os.Bundle;
8. importandroid.view.View;
9. importandroid.widget.AdapterView;
10. importandroid.widget.ArrayAdapter;
11. importandroid.widget.SimpleAdapter;
12. importandroid.widget.Spinner;
13. importandroid.widget.AdapterView.OnItemSelectedListener;
15. publicclassMainextendsActivity
16. {
17. @Override
18. publicvoidonCreate(BundlesavedInstanceState)
19. {
20. super.onCreate(savedInstanceState);
21. setContentView(R.layout.main);
22. //获取对象
23. Spinnerspinner1=(Spinner)findViewById(R.id.spinner1);
24. String[]applicationNames=newString[]
25. {"多功能日历","eoeMarket客户端","耐玩的重力消砖块","白社会","程序终结者"};
26. ArrayAdapter<String>aaAdapter=newArrayAdapter<String>(this,
27. android.R.layout.simple_spinner_item,applicationNames);
28. //将如下代码可以使列表项带RadioButton组件
29. //aaAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
30. spinner1.setAdapter(aaAdapter);
32. Spinnerspinner2=(Spinner)findViewById(R.id.spinner2);
33. finalList<Map<String,Object>>items=newArrayList<Map<String,Object>>();
34. Map<String,Object>item1=newHashMap<String,Object>();
35. item1.put("ivLogo",R.drawable.calendar);
36. item1.put("tvApplicationName","多功能日历");
37. Map<String,Object>item2=newHashMap<String,Object>();
38. item2.put("ivLogo",R.drawable.eoemarket);
39. item2.put("tvApplicationName","eoeMarket客户端");
40. items.add(item1);
41. items.add(item2);
42. SimpleAdaptersimpleAdapter=newSimpleAdapter(this,items,
43. R.layout.item,newString[]
44. {"ivLogo","tvApplicationName"},newint[]
45. {R.id.ivLogo,R.id.tvApplicationName});
46. spinner2.setAdapter(simpleAdapter);
47. //为Spinner2加上监听事件
48. spinner2.setOnItemSelectedListener(newOnItemSelectedListener()
49. {
51. @Override
52. publicvoidonItemSelected(AdapterView<?>parent,Viewview,
53. intposition,longid)
54. {
55. newAlertDialog.Builder(view.getContext()).setTitle(
56. items.get(position).get("tvApplicationName")
57. .toString()).setIcon(
58. Integer.parseInt(items.get(position).get("ivLogo")
59. .toString())).show();
60. }
62. @Override
63. publicvoidonNothingSelected(AdapterView<?>parent)
64. {
66. }
67. });
69. }
70. }
    

转： http://294460620.iteye.com/blog/1176100