Android entry 15th ActivityGroup implement Tab

Many client software and browser software like to use Tab pages to manage content. In addition to the TabHost control, you can also use ImageButton + ActivityGroup to implement Tab pages. You can use ImageButton + ActivityGroup to implement Tab tabs. You can add a Sub Activity Window as a View to the container specified by ActivityGroup, this article uses LinearLayout as the container to load Sub Activity.

Next, paste the example running:

 

The following is the status change of the Sub Activity lifecycle during switchover:

 

When switching from subActivity1 to subActivity2, the resources of subActivity1 will be completely released.

The source code of main. xml of the main Activity is as follows:

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<? 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>
 

The XML source code of Sub Activity (listview. xml) is as follows:

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<? 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>

The source code of testActivityGroup. java is as follows:

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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; // container for loading sub Activity
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 imple