Android入门之Spinner（纯Java）

Android入门之Spinner（纯Java）

1. import Android.app.Activity;  
2. import android.os.Bundle;  
3. import android.view.View;  
4. import android.widget.*;  
5. import android.widget.AdapterView.OnItemSelectedListener;  
6.   
7. public class SpinnerTest extends Activity {  
8.       
9.     private LinearLayout mainLayout=null;  
10.     private TextView tv1=null;  
11.     private Spinner spinner1=null;  
12.     private TextView tv2=null;  
13.     private Spinner spinner2=null;  
14.     private TextView tv3=null;  
15.       
16.     public void onCreate(Bundle savedInstanceState) {  
17.         super.onCreate(savedInstanceState);  
18.         mainLayout_init();  
19.         setContentView(mainLayout);  
20.     }  
21.       
22.     void mainLayout_init(){  
23.         mainLayout=new LinearLayout(this);  
24.         LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-1);  
25.         mainLayout.setLayoutParams(lp);  
26.         mainLayout.setOrientation(LinearLayout.VERTICAL);  
27.         tv1_init();  
28.         mainLayout.addView(tv1);  
29.         spinner1_init();  
30.         mainLayout.addView(spinner1);  
31.         tv2_init();  
32.         mainLayout.addView(tv2);  
33.         spinner2_init();  
34.         mainLayout.addView(spinner2);  
35.         tv3=new TextView(this);  
36.         tv3.setText("显示");  
37.         mainLayout.addView(tv3);  
38.     }  
39.     /*tv1初始化*/  
40.     void tv1_init(){  
41.         tv1=new TextView(this);  
42.         LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);  
43.         tv1.setLayoutParams(lp);  
44.         tv1.setText("Spinner测试");  
45.     }  
46.     /*spinner初始化*/  
47.     void spinner1_init(){  
48.         spinner1=new Spinner(this);  
49.         LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -2);  
50.         spinner1.setLayoutParams(lp);  
51.         spinner1.setPrompt("这是标题");  
52.         String s[]={"选项一","选项二","选项三"};  
53.         ArrayAdapter<String> aa=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,s);  
54.         //设置为下拉式Item格式   
55.         aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);  
56.         spinner1.setAdapter(aa);  
57.         //添加监听   
58.         OnItemSelectedListener otsc=new OnItemSelectedListener(){  
59.             public void onItemSelected(AdapterView<?> arg0, View arg1,int arg2, long arg3) {  
60.                 tv3.setText("选项"+String.valueOf(arg2+1)+"被你选中了");  
61.             }  
62.             public void onNothingSelected(AdapterView<?> arg0) {  
63.                   
64.             }  
65.         };  
66.         spinner1.setOnItemSelectedListener(otsc);  
67.     }  
68.     /**/  
69.     void tv2_init(){  
70.         tv2=new TextView(this);  
71.         LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);  
72.         tv2.setLayoutParams(lp);  
73.         tv2.setText("换一种风格");  
74.     }  
75.     /**/  
76.     void spinner2_init(){  
77.         //   
78.         spinner2=new Spinner(this);  
79.         LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1, -2);  
80.         spinner2.setLayoutParams(lp);  
81.         //spinner2.setPrompt("这是标题");   
82.         String s[]={"选项一","选项二","选项三"};  
83.         ArrayAdapter<String> aa=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,s);  
84.         //另一种风格   
85.         aa.setDropDownViewResource(android.R.layout.simple_spinner_item);  
86.         spinner2.setAdapter(aa);  
87.     }  
88. }