Android入门第十五篇之ActivityGroup实现Tab分页标签

很 多客户端软件和浏览器软件都喜欢用Tab分页标签来管理内容，除了可以用TabHost控件，还可以用ImageButton + ActivityGroup实现Tab分页标签。使用ImageButton + ActivityGroup实现Tab分页标签，主要是把一个Sub Activity(子Activity)的Window作为View添加到ActivityGroup所指定的容器中，本文使用LinearLayout 作为容器装载Sub Activity。

接下来贴出本例运行的效果图 ：

以下是切换时Sub Activity的生存周期的状态变化：

从subActivity1切换到subActivity2的时候，会彻底释放subActivity1的资源。

主Activity的main.xml的源码如下：

 <? xml   version = "1.0"   encoding = "utf-8" ?>
 < LinearLayout   xmlns:android = "http://schemas.android.com/apk/res/android"
     android:orientation = "vertical"   android:layout_width = "fill_parent"
     android:layout_height = "fill_parent" >
     < LinearLayout   android:id = "@+id/LinearLayout01"
         android:layout_height = "wrap_content"   android:layout_width = "fill_parent" >
         < ImageButton   android:layout_width = "wrap_content"
             android:layout_height = "wrap_content"   android:id = "@+id/ibtnTab1"
             android:background = "@drawable/png1298" > </ ImageButton >
         < ImageButton   android:layout_width = "wrap_content"
             android:layout_height = "wrap_content"   android:id = "@+id/ibtnTab2"
             android:background = "@drawable/png1292" > </ ImageButton >
     </ LinearLayout >
     < LinearLayout   android:id = "@+id/LinearLayout02"
         android:layout_width = "fill_parent"   android:layout_height = "fill_parent" > </ LinearLayout >
 </ LinearLayout >

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:id="@+id/LinearLayout01" android:layout_height="wrap_content" android:layout_width="fill_parent"> <ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ibtnTab1" android:background="@drawable/png1298"></ImageButton> <ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/ibtnTab2" android:background="@drawable/png1292"></ImageButton> </LinearLayout> <LinearLayout android:id="@+id/LinearLayout02" android:layout_width="fill_parent" android:layout_height="fill_parent"></LinearLayout> </LinearLayout>

Sub Activity的XML源码(listview.xml)如下：

 <? xml   version = "1.0"   encoding = "utf-8" ?>
 < LinearLayout   android:id = "@+id/LinearLayout01"
     xmlns:android = "http://schemas.android.com/apk/res/android"
     android:layout_width = "fill_parent"   android:layout_height = "fill_parent" >
     < ListView   android:id = "@+id/MyListView"   android:layout_width = "fill_parent"
         android:layout_height = "fill_parent" >
     </ ListView >
 </ LinearLayout >

<?xml version="1.0" encoding="utf-8"?> <LinearLayout android:id="@+id/LinearLayout01" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent"> <ListView android:id="@+id/MyListView" android:layout_width="fill_parent" android:layout_height="fill_parent"> </ListView> </LinearLayout>

testActivityGroup.java源码如下：

 package  com.testActivityGroup;

 import  android.app.ActivityGroup;
 import  android.content.Intent;
 import  android.os.Bundle;
 import  android.view.View;
 import  android.view.Window;
 import  android.widget.ImageButton;
 import  android.widget.LinearLayout;
 import  android.widget.ListView;

 public   class  testActivityGroup  extends  ActivityGroup {
     /** Called when the activity is first created. */
     LinearLayout container;//装载sub Activity的容器
     ImageButton ibtnTab1,ibtnTab2;
     @Override
     public   void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
         setContentView(R.layout.main);

         container = (LinearLayout) findViewById(R.id.LinearLayout02);
         ibtnTab1=(ImageButton)this .findViewById(R.id.ibtnTab1);
         ibtnTab1.setOnClickListener(new  ClickEvent());
         ibtnTab2=(ImageButton)this .findViewById(R.id.ibtnTab2);
         ibtnTab2.setOnClickListener(new  ClickEvent());
     }

     class  ClickEvent  implements  View.OnClickListener{

         @Override
         public   void  onClick(View v) {
             container.removeAllViews();
             Intent intent=new  Intent(testActivityGroup. this , subActivity. class );
             intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
             String[] str=new  String[ 12 ];
             if (v==ibtnTab1)
             {
                 for ( int  i= 0 ;i<str.length;i++)
                     str[i]="单选" +String.valueOf(i);
                 intent.putExtra("Name" ,  "subActivity1" );
                 intent.putExtra("Strings" , str);
                 intent.putExtra("ChoiceMode" , ListView.CHOICE_MODE_SINGLE); //通过参数设置列表式样
             }
             else   if (v==ibtnTab2)
             {
                 for ( int  i= 0 ;i<str.length;i++)
                     str[i]="复选" +String.valueOf(i);
                 intent.putExtra("Name" ,  "subActivity2" );
                 intent.putExtra("Strings" , str);
                 intent.putExtra("ChoiceMode" , ListView.CHOICE_MODE_MULTIPLE); //通过参数设置列表式样
             }

             Window subActivity=getLocalActivityManager().startActivity("subActivity" ,intent);
             container.addView(subActivity.getDecorView());
         }

     }
 }

package com.testActivityGroup; import android.app.ActivityGroup; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.Window; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.ListView; public class testActivityGroup extends ActivityGroup { /** Called when the activity is first created. */ LinearLayout container;//装载sub Activity的容器 ImageButton ibtnTab1,ibtnTab2; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); container = (LinearLayout) findViewById(R.id.LinearLayout02); ibtnTab1=(ImageButton)this.findViewById(R.id.ibtnTab1); ibtnTab1.setOnClickListener(new ClickEvent()); ibtnTab2=(ImageButton)this.findViewById(R.id.ibtnTab2); ibtnTab2.setOnClickListener(new ClickEvent()); } class ClickEvent implements View.OnClickListener{ @Override public void onClick(View v) { container.removeAllViews(); Intent intent=new Intent(testActivityGroup.this, subActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); String[] str=new String[12]; if(v==ibtnTab1) { for(int i=0;i<str.length;i++) str[i]="单选"+String.valueOf(i); intent.putExtra("Name", "subActivity1"); intent.putExtra("Strings", str); intent.putExtra("ChoiceMode", ListView.CHOICE_MODE_SINGLE);//通过参数设置列表式样 } else if(v==ibtnTab2) { for(int i=0;i<str.length;i++) str[i]="复选"+String.valueOf(i); intent.putExtra("Name", "subActivity2"); intent.putExtra("Strings", str); intent.putExtra("ChoiceMode", ListView.CHOICE_MODE_MULTIPLE);//通过参数设置列表式样 } Window subActivity=getLocalActivityManager().startActivity("subActivity",intent); container.addView(subActivity.getDecorView()); } } }

subActivity.java源码如下：

 package  com.testActivityGroup;

 import  android.app.Activity;
 import  android.os.Bundle;
 import  android.util.Log;
 import  android.widget.ArrayAdapter;
 import  android.widget.ListView;

 public   class  subActivity  extends  Activity {
     String name;

     public   void  onCreate(Bundle savedInstanceState) {
         super .onCreate(savedInstanceState);
         setContentView(R.layout.listview);

         // 读取列表内容
         name = this .getIntent().getStringExtra( "Name" );
         String[] str = this .getIntent().getStringArrayExtra( "Strings" );
         int  choiceMode =  this .getIntent().getIntExtra( "ChoiceMode" ,
                 ListView.CHOICE_MODE_NONE);

         ListView listView = (ListView) findViewById(R.id.MyListView);

         // 设置列表的式样
         int  itemID = android.R.layout.simple_list_item_1;
         if  (choiceMode == ListView.CHOICE_MODE_MULTIPLE) // 主Activity要求多选
             itemID = android.R.layout.simple_list_item_multiple_choice;
         else   if  (choiceMode == ListView.CHOICE_MODE_SINGLE) // 主Activity要求单选
             itemID = android.R.layout.simple_list_item_single_choice;

         ArrayAdapter<String> arrayAdapter = new  ArrayAdapter<String>( this ,
                 itemID, str);
         listView.setAdapter(arrayAdapter);

         listView.setChoiceMode(choiceMode);

         Log.e(name, "onCreate" ); // 显示当前状态，onCreate与onDestroy对应
     }
     @Override
     public   void  onDestroy() {
         super .onDestroy();
         Log.e(name, "onDestroy" ); // 显示当前状态，onCreate与onDestroy对应
     }

     @Override
     public   void  onStart() {
         super .onStart();
         Log.e(name, "onStart" ); // 显示当前状态，onStart与onStop对应
     }

     @Override
     public   void  onStop() {
         super .onStop();
         Log.e(name, "onStop" ); // 显示当前状态，onStart与onStop对应
     }

     @Override
     public   void  onRestart() {
         super .onRestart();
         Log.e(name, "onRestart" );
     }

     @Override
     public   void  onResume() {
         super .onResume();
         Log.e(name, "onResume" ); // 显示当前状态，onPause与onResume对应
     }

     @Override
     public   void  onPause() {
         super .onResume();
         Log.e(name, "onPause" ); // 显示当前状态，onPause与onResume对应
     }
 }