Android选项卡的几种实现方法

最近在解决TabActivity过期的问题时，发现Android中选项卡有几种实现方法：继承TabActivity，继承ActivityGroup，直接继承Activity和继承FragmentActivity。其中TabActivity在API 13（Android 3.2）被标记为过期，ActivityGroup在API 14（Android 4.0）被标记为过期，目前google推荐使用的是Fragment，也就是继承FragmentActivity。虽然TabActivity和ActivityGroup被标记为过期，已经不推荐使用，但在要求不是很高的时候用起来还是比使用Fragment要方便。

使用TabActivity实现选项卡可以不需要定义布局文件，实现案例如下：

[java]

package  yuchu.appmanager;

import  android.app.TabActivity;
import  android.content.Intent;
import  android.os.Bundle;
import  android.view.Window;
import  android.widget.TabHost;

@SuppressWarnings ( "deprecation" )
public  class  MainTabActivity  extends  TabActivity {

    private  Intent mAIntent;
    private  Intent mBIntent;

    public  void  onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        this .requestWindowFeature(Window.FEATURE_NO_TITLE);

        this .mAIntent =  new  Intent( this , ShowAppGrid. class );
        this .mBIntent =  new  Intent( this , ShowRunApps. class );

        TabHost tabhost = getTabHost();

        tabhost.addTab(tabhost.newTabSpec( "tab1" ).setIndicator( "所有资源" ).setContent( this .mAIntent));
        tabhost.addTab(tabhost.newTabSpec( "tab2" ).setIndicator( "正在运行" ).setContent( this .mBIntent));
    }
}
package  yuchu.appmanager;
import  android.app.TabActivity;
import  android.content.Intent;
import  android.os.Bundle;
import  android.view.Window;
import  android.widget.TabHost;
@SuppressWarnings ( "deprecation" )
public  class  MainTabActivity  extends  TabActivity {
private  Intent mAIntent;
private  Intent mBIntent;
public  void  onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
this .requestWindowFeature(Window.FEATURE_NO_TITLE);
this .mAIntent =  new  Intent( this , ShowAppGrid. class );
this .mBIntent =  new  Intent( this , ShowRunApps. class );
TabHost tabhost = getTabHost();
tabhost.addTab(tabhost.newTabSpec( "tab1" ).setIndicator( "所有资源" ).setContent( this .mAIntent));
tabhost.addTab(tabhost.newTabSpec( "tab2" ).setIndicator( "正在运行" ).setContent( this .mBIntent));
}
}

使用ActivityGroup实现选项卡也相当方便，布局文件如下：

[html]

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

代码如下：

[java]

package  yuchu.appmanager;

import  android.app.ActivityGroup;
import  android.content.Intent;
import  android.os.Bundle;
import  android.view.LayoutInflater;
import  android.view.Window;
import  android.widget.TabHost;

@SuppressWarnings ( "deprecation" )
public  class  MainTabActivity  extends  ActivityGroup {
    private  TabHost tabHost;
    private  Intent mAIntent;
    private  Intent mBIntent;
    @Override
    public  void  onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        this .requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.maintabs);

        this .mAIntent =  new  Intent( this , ShowAppGrid. class );
        this .mBIntent =  new  Intent( this , ShowRunApps. class );
        tabHost=(TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();
        tabHost.setup( this .getLocalActivityManager());
        LayoutInflater inflater = LayoutInflater.from( this );
        inflater.inflate(R.layout.showgrid, tabHost.getTabContentView());
        inflater.inflate(R.layout.showrunning, tabHost.getTabContentView());

        tabHost.addTab(tabHost.newTabSpec( "tab1" ).setIndicator( "所有资源" ).setContent( this .mAIntent));
        tabHost.addTab(tabHost.newTabSpec( "tab2" ).setIndicator( "正在运行" ).setContent( this .mBIntent));
    }
}
package  yuchu.appmanager;
import  android.app.ActivityGroup;
import  android.content.Intent;
import  android.os.Bundle;
import  android.view.LayoutInflater;
import  android.view.Window;
import  android.widget.TabHost;
@SuppressWarnings ( "deprecation" )
public  class  MainTabActivity  extends  ActivityGroup {
private  TabHost tabHost;
private  Intent mAIntent;
private  Intent mBIntent;
    @Override
    public  void  onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        this .requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.maintabs);

        this .mAIntent =  new  Intent( this , ShowAppGrid. class );
this .mBIntent =  new  Intent( this , ShowRunApps. class );
        tabHost=(TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();
        tabHost.setup( this .getLocalActivityManager());
        LayoutInflater inflater = LayoutInflater.from( this );
        inflater.inflate(R.layout.showgrid, tabHost.getTabContentView());
        inflater.inflate(R.layout.showrunning, tabHost.getTabContentView());

        tabHost.addTab(tabHost.newTabSpec( "tab1" ).setIndicator( "所有资源" ).setContent( this .mAIntent));
tabHost.addTab(tabHost.newTabSpec( "tab2" ).setIndicator( "正在运行" ).setContent( this .mBIntent));
    }
}