start application knowing package name

Try using PackageManager and getLaunchIntentForPackage()

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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