Android 通过findViewById方式创建TabHost
使用TabHost可以通过继承TabHost的方式，也可以通过继承ActivityGroup的方式。
通过extends TabHost比较简单，这里就不介绍了，以下是介绍通过extends ActivityGroup的方式使用TabHost，也就是通过findViewById方式创建TabHost对象的方式，这种方式大家可能会遇到以下错误提示：
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)，原因是也是未正确使用setup()
3、java.lang.IllegalStateException: Activities can't be added until the containing group has been created.，原因是未继承ActivityGroup，如果只是extends Activity是不行的，必须extends ActivityGroup
4、其它错误......
原因都是因为没有按正确的方法调用TabHost，附上代码：
1、AndroidManifest.xml
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.shuxiang.tabhostsample" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="15" /> <application android:label="@string/app_name"> <activity android:name=".MainActivity" android:label="@string/title_activity_main" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name="Tab1" android:launchMode="singleInstance" android:screenOrientation="user" android:configChanges="orientation|keyboardHidden"> <intent-filter> <action android:name="org.shuxiang.tabhostsample.Tab1" /> </intent-filter> </activity> <activity android:name="Tab2" android:launchMode="singleInstance" android:screenOrientation="user" android:configChanges="orientation|keyboardHidden"> <intent-filter> <action android:name="org.shuxiang.tabhostsample.Tab2" /> </intent-filter> </activity> <activity android:name="Tab3" android:launchMode="singleInstance" android:screenOrientation="user" android:configChanges="orientation|keyboardHidden"> <intent-filter> <action android:name="org.shuxiang.tabhostsample.Tab3" /> </intent-filter> </activity> </application></manifest>
layout下的布局文件：
2、tabhost.xml
<?xml version="1.0" encoding="utf-8"?><TabHost android:id="@android:id/tabhost" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:id="@+id/LinearLayout01" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical"> <TabWidget android:id="@android:id/tabs" android:layout_height="wrap_content" android:layout_width="fill_parent" /> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" /></LinearLayout></TabHost>
3、tabhost1.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal"> <TextView android:id="@+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第一个" android:padding="10px"/> </LinearLayout>
4、tabhost2.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal"> <TextView android:id="@+id/TextView02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第二个" android:padding="10px"/> </LinearLayout>
5、tabhost3.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal"> <TextView android:id="@+id/TextView02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第三个" android:padding="10px"/> </LinearLayout>
value下的文件：
6、strings.xml
<resources> <string name="app_name">TabHostSample</string> <string name="hello_world">Hello world!</string> <string name="menu_settings">Settings</string> <string name="title_activity_main">MainActivity</string></resources>
类文件：
7、MainActivity.java
package org.shuxiang.tabhostsample;import android.os.Bundle;import android.app.ActivityGroup;import android.content.Intent;import android.widget.TabHost;public class MainActivity extends ActivityGroup{private String tabHost1 = "A";private String tabHost2 = "B";private String tabHost3 = "C";private TabHost tabHost; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.tabhost); tabHost = (TabHost) findViewById(android.R.id.tabhost); tabHost.setup(getLocalActivityManager()); tabHost.setCurrentTab(0); tabHost.addTab(tabHost.newTabSpec(tabHost1) .setIndicator(tabHost1). setContent(new Intent(MainActivity.this, Tab1.class))); tabHost.addTab(tabHost.newTabSpec(tabHost2) .setIndicator(tabHost2) .setContent(new Intent(MainActivity.this, Tab2.class))); tabHost.addTab(tabHost.newTabSpec(tabHost3) .setIndicator(tabHost3) .setContent(new Intent(MainActivity.this, Tab3.class))); }}
8、Tab1.java
package org.shuxiang.tabhostsample;import android.app.Activity;import android.os.Bundle;public class Tab1 extends Activity{@Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.tabhost1);}}
9、Tab2.java
package org.shuxiang.tabhostsample;import android.app.Activity;import android.os.Bundle;public class Tab2 extends Activity{@Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.tabhost2);}}
10、Tab3.java
package org.shuxiang.tabhostsample;import android.app.Activity;import android.os.Bundle;public class Tab3 extends Activity{@Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.tabhost3);}}
附上效果图：
