call other applications inside another android application

Have reached a block while programming on android.Is there any way to change the default desktop in the android emulator? The only thing i have achieved till now is uninstalling the system applications.I understand that only an application can have an icon...right? Is there any way that an application when launched displays a set of icons (which may or may not be separate applications)开发者_如何学编程? On clicking these icons either an application or an activity is launched....any help on this matter would be highly appreciated.

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This answer gives more information.

The Home application in the Android open source project can only be built as part of a firmware image. It is not designed to be compiled just using the SDK. There is a sample Home application in your SDK, though, that builds with the SDK.

So, if your goal is to create a replacement home screen standalone app, use the Home app in your SDK as a starting point. If your goal is to create replacement firmware, download the entire firmware and build it that way.

Here is a link to the Home sample app.

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there is an example in the samples included with the SDK, here is a little more info:

http://developer.android.com/resources/samples/Home/index.html

be sure to add these lines to your AndroidManifest.xml in the intent filters:

            <category android:name="android.intent.category.HOME"/>
            <category android:name="android.intent.category.DEFAULT" />

when you hit the "home" button you should have two options; the Android launcher, and the one you've programmed as a replacement. i believe there, you can choose the default. you can change the default by clearing the settings under settings/apps/manage apps/launcher/clear defaults.