Android(安卓)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：

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