android网易顶部导航栏demo·下

      具体宽度样式大家可以自己调节，然后看一下核心类：

1. import android.app.ActivityGroup;  
2. import android.app.AlertDialog;  
3. import android.app.LocalActivityManager;  
4. import android.content.Context;  
5. import android.content.DialogInterface;  
6. import android.content.Intent;  
7. import android.os.Bundle;  
8. import android.view.KeyEvent;  
9. import android.view.View;  
10. import android.view.animation.Animation;  
11. import android.view.animation.AnimationUtils;  
12. import android.widget.Button;  
13. import android.widget.LinearLayout;  
14. import android.widget.RadioGroup;  
15. import android.widget.TextView;  
16. import android.widget.RadioGroup.OnCheckedChangeListener;  
17. public class AddExamActivity extends ActivityGroup {  
18.     protected Button btn_leftTop, btn_rightTop;  
19.     protected TextView tv_head;  
20.     private  static LocalActivityManager manager;  
21.     private  RadioGroup radioGroup;  
22.     private  static LinearLayout container;  
23.     public  static Context context;  
24.     @Override  
25.     protected void onCreate(Bundle savedInstanceState) {  
26.         // TODO Auto-generated method stub  
27.         super.onCreate(savedInstanceState);  
28.         setContentView(R.layout.addexam);  
29.         context=this;  
30.         initHead();  
31.         manager=getLocalActivityManager();  
32.         container= (LinearLayout)findViewById(R.id.container);  
33.         radioGroup=(RadioGroup) this.findViewById(R.id.add_tab_group);  
34.         container.removeAllViews();  
35.         container.addView(manager.startActivity(  
36.                 "PAGE_0",  
37.                 new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
38.                 .getDecorView());  
39.         radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {  
40.             @Override  
41.             public void onCheckedChanged(RadioGroup group, int checkedId) {  
42.                 // TODO Auto-generated method stub  
43.                 switch (checkedId) {  
44.                 case R.id.main_tab_addExam://添加考试  
45.                     container.removeAllViews();  
46.                     container.addView(manager.startActivity(  
47.                             "PAGE_0",  
48.                             new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
49.                             .getDecorView());  
50.                     break;  
51.                 case R.id.main_tab_myExam://我的考试  
52.                     container.removeAllViews();  
53.                     container.addView(manager.startActivity(  
54.                             "PAGE_1",  
55.                             new Intent(context, MyMessageActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
56.                             .getDecorView());  
57.                     break;  
58.                 case R.id.main_tab_message://我的通知  
59.                     container.removeAllViews();  
60.                     container.addView(manager.startActivity(  
61.                             "PAGE_2",  
62.                             new Intent(context, SettingActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
63.                             .getDecorView());  
64.                     break;  
65.                 case R.id.main_tab_testing://测试  
66.                     container.removeAllViews();  
67.                     container.addView(manager.startActivity(  
68.                             "PAGE_3",  
69.                             new Intent(context, TestingActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
70.                             .getDecorView());  
71.                     break;  
72.                 case R.id.main_tab_settings://设置  
73.                     container.removeAllViews();  
74.                     container.addView(manager.startActivity(  
75.                             "PAGE_4",  
76.                             new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
77.                             .getDecorView());  
78.                     break;  
79.                 default:  
80.                     //tabHost.setCurrentTabByTag("我的考试");  
81.                     break;  
82.                 }  
83.             }  
84.         });  
85.     }  
86.     public static void changeTo(){  
87.         Animation slideLeftIn = AnimationUtils.loadAnimation(context, R.anim.slide_bottom_in_no_alpha);  
88.         container.removeAllViews();  
89.         container.addView(manager.startActivity(  
90.                 "PAGE_4",  
91.                 new Intent(context, MyExamActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))  
92.                 .getDecorView());  
93.         container.startAnimation(slideLeftIn);  
94.     }  
95.     protected void initHead() {  
96.         btn_leftTop = (Button) findViewById(R.id.btn_leftTop);  
97.         btn_rightTop = (Button) findViewById(R.id.btn_rightTop);  
98.         tv_head = (TextView) findViewById(R.id.tv_head);  
99.         btn_leftTop.setVisibility(View.INVISIBLE);  
100.         tv_head.setText("添加考试");  
101.     }  
102.    @Override  
103.     public boolean onKeyDown(int keyCode, KeyEvent event) {  
104.         // TODO Auto-generated method stub  
105.         if (keyCode == KeyEvent.KEYCODE_BACK) {  
106.             AlertDialog.Builder builder = new AlertDialog.Builder(getParent());  
107.             builder.setMessage("你确定退出吗？")  
108.                     .setCancelable(false)  
109.                     .setPositiveButton("确定",  
110.                             new DialogInterface.OnClickListener() {  
111.                                 public void onClick(DialogInterface dialog,  
112.                                         int id) {  
113.                                     finish();  
114.                                     System.exit(0);  
115.                                 }  
116.                             })  
117.                     .setNegativeButton("返回",  
118.                             new DialogInterface.OnClickListener() {  
119.                                 public void onClick(DialogInterface dialog,  
120.                                         int id) {  
121.                                     dialog.cancel();  
122.                                 }  
123.                             });  
124.             AlertDialog alert = builder.create();  
125.             alert.show();  
126.             return true;  
127.         }  
128.         return super.onKeyDown(keyCode, event);  
129.     }  
130. }  

      这里继承了ActivityGroup，没有使用过的朋友从百度搜索下就明白了。

     使用了LocalActivityManager启动子activity，这里Context和LinearLayout使用了static静态的，这是因为变态的需求使我不得不这样做，希望大家不要把这两个变量设置成static的，因为static的生命周期很长特别是Context不要设置成static，这样的话当前的activity很难被销毁的。其实使用tabhost完全可以实现，但是为什么没使用tabhost的我相信大家都明白，如果不考虑内存的话我也会使用，哈哈！

      最后附上源码下载地址，有兴趣大家自己下载吧！点击打开链接