android: spinner及setDropDownViewResource的使用及自定义Spinner样式

Spinner下拉列表

一般使用非常简单。直接上代码

1.布局文件

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:background="#eeeeee"
 6      android:orientation="vertical">
 7     <LinearLayout 
 8     android:layout_width="match_parent"
 9     android:layout_height="wrap_content">
10 
11         <RelativeLayout
12             android:id="@+id/relativeLayout1"
13             android:layout_width="fill_parent"
14             android:layout_height="40dp"
15             android:background="#3366CC"
16             android:gravity="center" >
17 
18 
19             <Spinner
20                 android:id="@+id/Title_Spinner"
21                 android:layout_width="wrap_content"
22                 android:layout_height="wrap_content"
23                 android:layout_alignParentTop="true"
24                 android:layout_centerHorizontal="true" />
25 
26 
27         </RelativeLayout>
28     </LinearLayout>
29 
30     <RelativeLayout
31         android:layout_width="match_parent"
32         android:layout_height="fill_parent" >
33 
34         <TextView
35             android:id="@+id/textView1"
36             android:layout_width="wrap_content"
37             android:layout_height="wrap_content"
38             android:layout_centerHorizontal="true"
39             android:layout_centerVertical="true"
40             android:text="TextView" />
41 
42     </RelativeLayout>
43 
44 </LinearLayout>

2.Activity

 1 public class MainActivity extends Activity {
 2     private Spinner mSpinner;
 3     private TextView mTextView;
 4 
 5     private List<String> listItem ;
 6 
 7     @Override
 8     public void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.activity_main);
11 
12         getViews();
13         initSpinner();
14     }
15 
16     private void initSpinner() {
17         getData();
18         ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_spinner_item,listItem);
19         //setDropDownViewResource设置弹出样式
20 //        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
21         mSpinner.setAdapter(adapter);
22     }
23     private void getData(){
24         listItem = new ArrayList<String>();
25         for(int i=0;i<6;i++)
26             listItem.add("item_"+i);
27     }
28 
29     private void getViews() {
30         mSpinner = (Spinner) findViewById(R.id.Title_Spinner);
31         mTextView = (TextView) findViewById(R.id.textView1);
32     }
33 
34     @Override
35     public boolean onCreateOptionsMenu(Menu menu) {
36         getMenuInflater().inflate(R.menu.activity_main, menu);
37         return true;
38     }
39 
40 }

使用adapter.setDropDownViewResource时效果是

不使用时效果：

接下来自定义Spinner样式

只需修改一下MainActivity.java

 1 public class MainActivity extends Activity {
 2     private Spinner mSpinner;
 3     private TextView mTextView;
 4 
 5     private List<String> listItem ;
 6 
 7     @Override
 8     public void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.activity_main);
11 
12         getViews();
13         initSpinner();
14     }
15 
16     private void initSpinner() {
17         getData();
18         //使用自定义的Adapter
19         MySpinnerAdapter adapter = new MySpinnerAdapter();
20         mSpinner.setAdapter(adapter);
21     }
22     private void getData(){
23         listItem = new ArrayList<String>();
24         for(int i=0;i<6;i++)
25             listItem.add("item_"+i);
26     }
27 
28     private void getViews() {
29         mSpinner = (Spinner) findViewById(R.id.Title_Spinner);
30         mTextView = (TextView) findViewById(R.id.textView1);
31     }
32 
33     @Override
34     public boolean onCreateOptionsMenu(Menu menu) {
35         getMenuInflater().inflate(R.menu.activity_main, menu);
36         return true;
37     }
38     
39     /**
40      * 自定义Adapter
41      */
42     class MySpinnerAdapter extends BaseAdapter{
43         public MySpinnerAdapter() {
44         }
45 
46         @Override
47         public int getCount() {
48             return listItem.size();
49         }
50         
51         @Override
52         public Object getItem(int position) {
53             return listItem.get(position);
54         }
55 
56         @Override
57         public long getItemId(int position) {
58             return position;
59         }
60 
61         @Override
62         public View getView(int position, View convertView, ViewGroup parent) {
63             // 动态生成每个下拉项对应的View，每个下拉项View由LinearLayout
64             // 中包含一个ImageView及一个TextView构成
65             // 初始化LinearLayout
66             LinearLayout ll = new LinearLayout(MainActivity.this);
67             ll.setOrientation(LinearLayout.HORIZONTAL);
68             // 初始化TextView
69             TextView tv = new TextView(MainActivity.this);
70             tv.setText(listItem.get(position));
71             tv.setTextSize(18);
72             tv.setTextColor(Color.LTGRAY);
73             ll.addView(tv);
74             return ll;
75         }
76         
77     }
78 }

效果。可以自己定义一些布局

posted on 2012-11-02 19:53 mathore 阅读(4415) 评论(0) 编辑收藏举报