Android入门之ImageButton（纯Java）

Android入门之ImageButton（纯Java）

1. import Android.app.Activity;  
2. import android.os.Bundle;  
3. import android.view.View;  
4. import android.view.View.OnClickListener;  
5. import android.widget.*;  
6.   
7. public class ImageButtonTest extends Activity {  
8.       
9.     private RelativeLayout mainLayout=null; //主容器   
10.     private TextView tv=null;               //文本   
11.     private Button button=null;             //普通文字按钮   
12.     private ImageButton ib=null;            //图片按钮   
13.       
14.     public void onCreate(Bundle savedInstanceState) {  
15.         super.onCreate(savedInstanceState);  
16.         mainLayout_init();  
17.         setContentView(mainLayout);//显示mainLayout   
18.     }  
19.     /*mainLayout初始化*/  
20.     void mainLayout_init(){  
21.         mainLayout=new RelativeLayout(this);  
22.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-1,-1);  
23.         mainLayout.setLayoutParams(lp);  
24.         tv_init();  
25.         button_init();  
26.         ib_init();  
27.         mainLayout.addView(tv);  
28.         mainLayout.addView(button);  
29.         mainLayout.addView(ib);  
30.     }  
31.     /*tv初始化*/  
32.     void tv_init(){  
33.         tv=new TextView(this);  
34.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-1, -2);  
35.         lp.addRule(RelativeLayout.CENTER_VERTICAL);//垂直居中   
36.         tv.setLayoutParams(lp);  
37.         tv.setText("这里显示案件相应");  
38.     }  
39.     /*buton初始化*/  
40.     void button_init(){  
41.         button=new Button(this);  
42.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);  
43.         button.setLayoutParams(lp);  
44.         //设定文字   
45.         button.setText("普通文字按钮");  
46.         //绑定单击监听   
47.         button.setOnClickListener(new OnClickListener(){  
48.             public void onClick(View v) {  
49.                 tv.setText("你单击了普通文字按钮");  
50.             }  
51.         });  
52.     }  
53.     /*ib初始化*/  
54.     void ib_init(){  
55.         ib=new ImageButton(this);  
56.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2, -2);  
57.         lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);//居底   
58.         lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);//居右   
59.         ib.setLayoutParams(lp);  
60.         //设定图片   
61.         ib.setImageResource(this.getResources().getIdentifier("icon", "drawable", getPackageName()));  
62.         //绑定单击监听   
63.         ib.setOnClickListener(new OnClickListener(){  
64.             public void onClick(View v) {  
65.                 tv.setText("你单击了图片按钮");  
66.             }  
67.         });  
68.     }  
69. }