Android中實現底部Tabhost【附源碼】

這個主要是實現底部的tabhost方式，tabhost就是有幾個標簽滑動的一個控件。activity繼承TabActivity
其他不多說了，直接上代碼

1. public class main extends TabActivity {   
2.     private TabHost tabHost;   
3.     private TabWidget tabWidget;   
4.     Field mBottomLeftStrip;   
5.     Field mBottomRightStrip;   
6.   
7.     @Override  
8.     public void onCreate(Bundle savedInstanceState) {   
9.         super.onCreate(savedInstanceState);   
10.         setContentView(R.layout.main);   
11.   
12.         makeTab();   
13.     }   
14.   
15.     public void makeTab() {   
16.         if (this.tabHost == null) {   
17.             tabHost = getTabHost();   
18.             tabWidget = getTabWidget();   
19.             tabHost.setup();   
20.             tabHost.bringToFront();   
21.   
22.             TabSpec firsttab = tabHost.newTabSpec("firsttab");   
23.             TabSpec sencondtab = tabHost.newTabSpec("sencondtab");   
24.             TabSpec thirdtab = tabHost.newTabSpec("thirdtab");   
25.   
26.             firsttab.setIndicator("first",   
27.                     getResources().getDrawable(R.drawable.first)).setContent(   
28.                     new Intent(this, first.class));   
29.             sencondtab.setIndicator("second",   
30.                     getResources().getDrawable(R.drawable.second)).setContent(   
31.                     new Intent(this, second.class));   
32.             thirdtab.setIndicator("third",   
33.                     getResources().getDrawable(R.drawable.third)).setContent(   
34.                     new Intent(this, third.class));   
35.   
36.             tabHost.addTab(firsttab);   
37.             tabHost.addTab(sencondtab);   
38.             tabHost.addTab(thirdtab);   
39.   
40.             if (Integer.valueOf(Build.VERSION.SDK) <= 7) {   
41.                 try {   
42.                     mBottomLeftStrip = tabWidget.getClass().getDeclaredField(   
43.                             "mBottomLeftStrip");   
44.                     mBottomRightStrip = tabWidget.getClass().getDeclaredField(   
45.                             "mBottomRightStrip");   
46.                     if (!mBottomLeftStrip.isAccessible()) {   
47.                         mBottomLeftStrip.setAccessible(true);   
48.                     }   
49.                     if (!mBottomRightStrip.isAccessible()) {   
50.                         mBottomRightStrip.setAccessible(true);   
51.                     }   
52.                     mBottomLeftStrip.set(tabWidget,   
53.                             getResources().getDrawable(R.drawable.linee));   
54.                     mBottomRightStrip.set(tabWidget, getResources()   
55.                             .getDrawable(R.drawable.linee));   
56.   
57.                 } catch (Exception e) {   
58.                     e.printStackTrace();   
59.                 }   
60.             } else {   
61.                 try {   
62.                     mBottomLeftStrip = tabWidget.getClass().getDeclaredField(   
63.                             "mLeftStrip");   
64.                     mBottomRightStrip = tabWidget.getClass().getDeclaredField(   
65.                             "mRightStrip");   
66.                     if (!mBottomLeftStrip.isAccessible()) {   
67.                         mBottomLeftStrip.setAccessible(true);   
68.                     }   
69.                     if (!mBottomRightStrip.isAccessible()) {   
70.                         mBottomRightStrip.setAccessible(true);   
71.                     }   
72.                     mBottomLeftStrip.set(tabWidget,   
73.                             getResources().getDrawable(R.drawable.linee));   
74.                     mBottomRightStrip.set(tabWidget, getResources()   
75.                             .getDrawable(R.drawable.linee));   
76.                 } catch (Exception e) {   
77.                     e.printStackTrace();   
78.                 }   
79.             }   
80.   
81.             for (int i = 0; i < tabWidget.getChildCount(); i++) {   
82.   
83.                 View view = tabWidget.getChildAt(i);   
84.                 if (tabHost.getCurrentTab() == i) {   
85.                     view.setBackgroundDrawable(getResources().getDrawable(   
86.                             R.drawable.focus));   
87.                 } else {   
88.                     view.setBackgroundDrawable(getResources().getDrawable(   
89.                             R.drawable.unfocus));   
90.                 }   
91.             }   
92.   
93.             tabHost.setOnTabChangedListener(new OnTabChangeListener() {   
94.   
95.                 @Override  
96.                 public void onTabChanged(String tabId) {   
97.                     for (int i = 0; i < tabWidget.getChildCount(); i++) {   
98.                         View view = tabWidget.getChildAt(i);   
99.                         Toast.makeText(main.this, tabId, Toast.LENGTH_SHORT).show();   
100.                         if (tabHost.getCurrentTab() == i) {   
101.                             view.setBackgroundDrawable(getResources()   
102.                                     .getDrawable(R.drawable.focus));   
103.                         } else {   
104.                             view.setBackgroundDrawable(getResources()   
105.                                     .getDrawable(R.drawable.unfocus));   
106.                         }   
107.                     }   
108.                 }   
109.             });   
110.         }   
111.     }   
112. }