用ActivityGroup解决TabHost中多个Activity跳转问题

下面图片是测试程序的效果图

 

  

 

 

两个选项卡的实现

 

   布局文件  main.xml

 

 <?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">

     <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="wrap_content"
                 android:layout_weight="3">

             </FrameLayout>


         </LinearLayout>
     </TabHost>

 </LinearLayout>

 

 

    Java代码实现  MainActivity.java

 

 package hkp.test;

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

 public class MainActivity extends TabActivity {

     private  TabHost tabHost;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);

         tabHost = getTabHost();

         tabHost.addTab(tabHost.newTabSpec("tab1")
                 .setIndicator("First")
                 .setContent(new Intent(this,FirstGroupTab.class)));//第一个选项卡使用一个ActivityGroup
         tabHost.addTab(tabHost.newTabSpec("tab2")
                 .setIndicator("Second")
                 .setContent(new Intent(this, SecondTab.class)));//第二个选项卡是一个Activity

         tabHost.setCurrentTab(0);
     }

 }

 

    使用 ActivityGroup的管理

 

 package hkp.test;

 import android.app.ActivityGroup;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.Window;

 /**
  * @author HuangKaipeng hkp2006@gmail.com
  * 2011-10-5
  *
  */
 public class FirstGroupTab extends ActivityGroup {

     /**
      * 一个静态的ActivityGroup变量，用于管理本Group中的Activity
      */
     public static ActivityGroup group;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);

         group = this;

     }

     @Override
     public void onBackPressed() {
         // TODO Auto-generated method stub
 //      super.onBackPressed();
         //把后退事件交给子Activity处理
         group.getLocalActivityManager()
             .getCurrentActivity().onBackPressed();
     }

     @Override
     protected void onResume() {
         // TODO Auto-generated method stub
         super.onResume();
         //把界面切换放到onResume方法中是因为，从其他选项卡切换回来时，
         //调用搞得是onResume方法

         //要跳转的界面
         Intent intent = new Intent(this, FirstActivity.class).
                   addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
         //把一个Activity转换成一个View
         Window w = group.getLocalActivityManager().startActivity("FirstActivity",intent);
         View view = w.getDecorView();
         //把View添加大ActivityGroup中
         group.setContentView(view);
     }

 

    ActivityGroup中的第一个Activity

 

 

 package hkp.test;

 import android.app.Activity;
 import android.content.Intent;
 import android.os.Bundle;
 import android.view.View;
 import android.view.Window;
 import android.view.View.OnClickListener;
 import android.widget.Button;

 /**
  * @author HuangKaipeng hkp2006@gmail.com
  * 2011-10-5
  *
  */
 public class FirstActivity extends Activity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         // TODO Auto-generated method stub
         super.onCreate(savedInstanceState);
         setContentView(R.layout.first_activity);

         //跳转到第二个界面
         Button btn = (Button) findViewById(R.id.btn);
         btn.setOnClickListener(new OnClickListener() {

             @Override
             public void onClick(View v) {
                 // TODO Auto-generated method stub
                 Intent intent = new Intent(FirstActivity.this, SecondActivity.class).
                           addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                 //把一个Activity转换成一个View
                 Window w = FirstGroupTab.group.getLocalActivityManager()
                         .startActivity("SecondActivity",intent);
                 View view = w.getDecorView();
                 //把View添加大ActivityGroup中
                 FirstGroupTab.group.setContentView(view);
             }
         });
     }

 }

 

 

    XML

 

 <?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"
     >
 <TextView
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text="这个是ActivityGroup中的第一个界面！"
     />
     <Button android:id="@+id/btn"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:text="跳转到本组中的另一个Activity中"/>
 </LinearLayout>