Redirect to Another Application

String APP_PACKAGE_NAME = "com.example.demo";

Intent intent;

     try {

            PackageManager pm = getPackageManager();

            intent = pm.getLaunchIntentForPackage(APP_PACKAGE_NAME);

            startActivity(intent);

                                       

     } catch (Exception e) {

            

            startActivity(new Intent(Intent.ACTION_VIEW,

                 Uri.parse("market://details?id=" + APP_PACKAGE_NAME)));

     }

Note :

• APP_PACKAGE_NAME is the package name of 2nd  Application.
• If 2nd application is not install then it redirect to playstore for install that application.