Android入门之ImageSwitcher（纯Java)

Android入门之ImageSwitcher（纯Java)

1. import Android.app.Activity;  
2. import android.os.Bundle;  
3. import android.view.View;  
4. import android.view.Window;  
5. import android.view.View.OnClickListener;  
6. import android.widget.*;  
7. import android.widget.ImageView.ScaleType;  
8. import android.widget.ViewSwitcher.ViewFactory;  
9.   
10. public class ImageSwitcherTest extends Activity {  
11.       
12.     private ImageSwitcherTest ist=this;     //ist   
13.       
14.     private LinearLayout mainLayout=null;   //定义一个线性布局，主布局   
15.     private ImageSwitcher is=null;          //定义图片切换控件   
16.     private RelativeLayout layout=null;     //定义一个相对布局，用于盛放两个按钮   
17.     private TextView tv=null;               //定义一个文本   
18.     private Button preButton=null;          //按钮，上一张   
19.     private Button nextButton=null;         //按钮，下一张   
20.     private int[] imageList={ R.drawable.p1,R.drawable.p2,R.drawable.p3,R.drawable.p4};//图片资源数组   
21.     private int index=0;                    //图片索引   
22.       
23.     public void onCreate(Bundle savedInstanceState) {  
24.         super.onCreate(savedInstanceState);  
25.         requestWindowFeature(Window.FEATURE_NO_TITLE);//隐藏标题   
26.         mainLayout_init();  
27.         setContentView(mainLayout);  
28.     }  
29.     /*mianLayout初始化*/  
30.     void mainLayout_init(){  
31.         mainLayout=new LinearLayout(this);  
32.         LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-1);  
33.         mainLayout.setLayoutParams(lp);  
34.         mainLayout.setOrientation(LinearLayout.VERTICAL);  
35.         is_init();  
36.         mainLayout.addView(is);  
37.         layout_init();  
38.         mainLayout.addView(layout);  
39.     }  
40.     /*is初始化*/  
41.     void is_init(){  
42.         is=new ImageSwitcher(this);  
43.         LinearLayout.LayoutParams lp=new LinearLayout.LayoutParams(-1,-2);  
44.         is.setLayoutParams(lp);  
45.         is.setFactory(new ViewFactory(){  
46.             /* 
47.              * 此处ViewFacktroy是一个接口，类似于OnClickeLisnter之类的 
48.              * 我们可以新建一个ViewFactroy，也可以让Activity implements ViewFactory 
49.              */  
50.             public View makeView() {  
51.                 ImageView iv=new ImageView(ist);  
52.                 iv.setScaleType(ScaleType.FIT_CENTER);  
53.                 iv.setLayoutParams(new ImageSwitcher.LayoutParams(-1,-1));  
54.                 return iv;  
55.             }  
56.         });  
57.         is.setImageResource(imageList[index]);  
58.     }  
59.     /*layout初始化*/  
60.     void layout_init(){  
61.         layout=new RelativeLayout(this);  
62.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-1,-2);  
63.         layout.setLayoutParams(lp);  
64.         tv_init();  
65.         layout.addView(tv);  
66.         preButton_init();  
67.         layout.addView(preButton);  
68.         nextButton_init();  
69.         layout.addView(nextButton);  
70.     }  
71.     /*tv初始化*/  
72.     void tv_init(){  
73.         tv=new TextView(this);  
74.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2,-2);  
75.         lp.addRule(RelativeLayout.CENTER_HORIZONTAL);  
76.         tv.setLayoutParams(lp);  
77.         tv.setText(String.valueOf(index+1)+"/4");  
78.     }  
79.     /*preButton初始化*/  
80.     void preButton_init(){  
81.         preButton=new Button(this);  
82.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2,-2);  
83.         lp.addRule(RelativeLayout.ALIGN_PARENT_LEFT);  
84.         preButton.setLayoutParams(lp);  
85.         preButton.setText("上一张");  
86.         preButton.setEnabled(false);  
87.         preButton.setOnClickListener(new OnClickListener(){  
88.             public void onClick(View v) {  
89.                 if(index==3){  
90.                     nextButton.setEnabled(true);  
91.                 }  
92.                 if(index>0){  
93.                     index--;  
94.                     is.setImageResource(imageList[index]);  
95.                     if(index==0){  
96.                         preButton.setEnabled(false);  
97.                     }  
98.                 }  
99.                 tv.setText(String.valueOf(index+1)+"/4");  
100.             }  
101.         });  
102.     }  
103.     /*nextButton初始化*/  
104.     void nextButton_init(){  
105.         nextButton=new Button(this);  
106.         RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(-2,-2);  
107.         lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);  
108.         nextButton.setLayoutParams(lp);  
109.         nextButton.setText("下一张");  
110.         nextButton.setOnClickListener(new OnClickListener(){  
111.             public void onClick(View v) {  
112.                 if(index==0){  
113.                     preButton.setEnabled(true);  
114.                 }  
115.                 if(index<3){  
116.                     index++;  
117.                     is.setImageResource(imageList[index]);  
118.                     if(index==3){  
119.                         nextButton.setEnabled(false);  
120.                     }  
121.                 }  
122.                 tv.setText(String.valueOf(index+1)+"/4");  
123.             }  
124.         });  
125.     }  
126. }