Android 通過findViewById方式創建TabHost

使用TabHost可以通過繼承TabHost的方式，也可以通過繼承ActivityGroup的方式。

通過extends TabHost比較簡單，這裡就不介紹了，以下是介紹通過extends ActivityGroup的方式使用TabHost，也就是通過findViewById方式創建TabHost對象的方式，這種方式大家可能會遇到以下錯誤提示：

1、java.lang.IllegalStateException: Did you forget to call 'public void setup，原因是未使用setup()

2、Android Exception: Did you forget to call 'public void setup (LocalActivityManager activityGroup)，原因是也是未正確使用setup()

3、java.lang.IllegalStateException: Activities can't be added until the containing group has been created.，原因是未繼承ActivityGroup，如果只是extends Activity是不行的，必須extends ActivityGroup

4、其它錯誤......

原因都是因為沒有按正確的方法調用TabHost，附上代碼：

1、AndroidManifest.xml

1. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
2. package="org.shuxiang.tabhostsample"
3. android:versionCode="1"
4. android:versionName="1.0" >
6. <uses-sdk
7. android:minSdkVersion="7"
8. android:targetSdkVersion="15" />
10. <application android:label="@string/app_name">
11. <activity
12. android:name=".MainActivity"
13. android:label="@string/title_activity_main" >
14. <intent-filter>
15. <action android:name="android.intent.action.MAIN" />
17. <category android:name="android.intent.category.LAUNCHER" />
18. </intent-filter>
19. </activity>
21. <activity android:name="Tab1" android:launchMode="singleInstance" android:screenOrientation="user" android:configChanges="orientation|keyboardHidden">
22. <intent-filter>
23. <action android:name="org.shuxiang.tabhostsample.Tab1" />
24. </intent-filter>
25. </activity>
27. <activity android:name="Tab2" android:launchMode="singleInstance" android:screenOrientation="user" android:configChanges="orientation|keyboardHidden">
28. <intent-filter>
29. <action android:name="org.shuxiang.tabhostsample.Tab2" />
30. </intent-filter>
31. </activity>
33. <activity android:name="Tab3" android:launchMode="singleInstance" android:screenOrientation="user" android:configChanges="orientation|keyboardHidden">
34. <intent-filter>
35. <action android:name="org.shuxiang.tabhostsample.Tab3" />
36. </intent-filter>
37. </activity>
38. </application>
40. </manifest>

layout下的布局文件：

2、tabhost.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <TabHost android:id="@android:id/tabhost" xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent" android:layout_height="fill_parent">
4. <LinearLayout android:id="@+id/LinearLayout01" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical">
5. <TabWidget android:id="@android:id/tabs" android:layout_height="wrap_content" android:layout_width="fill_parent" />
6. <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" />
7. </LinearLayout>
8. </TabHost>

3、tabhost1.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="horizontal">
7. <TextView android:id="@+id/TextView01"
8. android:layout_width="wrap_content"
9. android:layout_height="wrap_content"
10. android:text="第一個"
11. android:padding="10px"/>
13. </LinearLayout>

4、tabhost2.xml

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="horizontal">
7. <TextView android:id="@+id/TextView02"
8. android:layout_width="wrap_content"
9. android:layout_height="wrap_content"
10. android:text="第二個"
11. android:padding="10px"/>
13. </LinearLayout>

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="horizontal">
7. <TextView android:id="@+id/TextView02"
8. android:layout_width="wrap_content"
9. android:layout_height="wrap_content"
10. android:text="第三個"
11. android:padding="10px"/>
13. </LinearLayout>

value下的文件：

6、strings.xml

1. <resources>
2. <string name="app_name">TabHostSample</string>
3. <string name="hello_world">Hello world!</string>
4. <string name="menu_settings">Settings</string>
5. <string name="title_activity_main">MainActivity</string>
6. </resources>

7、MainActivity.java

1. package org.shuxiang.tabhostsample;
3. import android.os.Bundle;
4. import android.app.ActivityGroup;
5. import android.content.Intent;
6. import android.widget.TabHost;
8. public class MainActivity extends ActivityGroup
9. {
10. private String tabHost1 = "A";
11. private String tabHost2 = "B";
12. private String tabHost3 = "C";
13. private TabHost tabHost;
15. @Override
16. public void onCreate(Bundle savedInstanceState) {
17. super.onCreate(savedInstanceState);
18. setContentView(R.layout.tabhost);
20. tabHost = (TabHost) findViewById(android.R.id.tabhost);
22. tabHost.setup(getLocalActivityManager());
24. tabHost.setCurrentTab(0);
25. tabHost.addTab(tabHost.newTabSpec(tabHost1)
26. .setIndicator(tabHost1).
27. setContent(new Intent(MainActivity.this, Tab1.class)));
28. tabHost.addTab(tabHost.newTabSpec(tabHost2)
29. .setIndicator(tabHost2)
30. .setContent(new Intent(MainActivity.this, Tab2.class)));
31. tabHost.addTab(tabHost.newTabSpec(tabHost3)
32. .setIndicator(tabHost3)
33. .setContent(new Intent(MainActivity.this, Tab3.class)));
35. }
38. }

8、Tab1.java

1. package org.shuxiang.tabhostsample;
3. import android.app.Activity;
4. import android.os.Bundle;
6. public class Tab1 extends Activity
7. {
8. @Override
9. public void onCreate(Bundle savedInstanceState)
10. {
11. super.onCreate(savedInstanceState);
12. setContentView(R.layout.tabhost1);
13. }
14. }

9、Tab2.java

1. package org.shuxiang.tabhostsample;
3. import android.app.Activity;
4. import android.os.Bundle;
6. public class Tab2 extends Activity
7. {
8. @Override
9. public void onCreate(Bundle savedInstanceState)
10. {
11. super.onCreate(savedInstanceState);
12. setContentView(R.layout.tabhost2);
13. }
14. }

10、Tab3.java

1. package org.shuxiang.tabhostsample;
3. import android.app.Activity;
4. import android.os.Bundle;
6. public class Tab3 extends Activity
7. {
8. @Override
9. public void onCreate(Bundle savedInstanceState)
10. {
11. super.onCreate(savedInstanceState);
12. setContentView(R.layout.tabhost3);
13. }
14. }

附上效果圖：