Just use these following two lines, so you can launch any installed application whose package name is known:
Intent launchIntent = getPackageManager().getLaunchIntentForPackage("com.example.abc");
startActivity( launchIntent );
If you don't know the package name of application that you wanted to launch then try your hand on:
PackageManager pm;
pm = getPackageManager();
// get a list of installed apps.
packages = pm.getInstalledApplications(0);
For more information, refer to this link: Using Package Manager.
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