Launching Android app, within an app?

I'm writing a basic application. One of the features I'm interested in trying to do is to launch another app, INSIDE the app already running.

Eg. I have an app with 3 menu options, 1 and 2 do 开发者_StackOverflow中文版certain tasks as part of this parent app, menu option 3 launches another app that's installed on the phone. I'm not sure if this is possible?

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This is possible with the Intents mechanism.

The exact Intent you'll have to write depend on various factors:

• do you have to provide some data to the launched application?
• do you target a specific application or do you want to let the user choose the application he prefers for that task (in case he has several applications able to do what you need)?
• do you want to ensure that the application is available? (that would be better)
• do you know if the other app provides specific intent-filters to do some tasks?

Edit:

Then, you should be able to start the second application with the following code:

Intent i = new Intent(Intent.ACTION_MAIN);
i.addCategory(Intent.CATEGORY_LAUNCHER);
i.setPackage("com.otherapp.package");
startActivity(i);

Place this code in the OnClickListener of your button and that should be enough.