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：
