new AlertDialog.Builder(context)       .setTitle("Blocked!")
                .setMessage("This application is restricted by administrator")
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        Intent startHomescreen=new Intent(Intent.ACTION_MAIN);
                        startHomescreen.addCategory(Intent.CATEGORY_HOME);
                        startHomescreen.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
                        startActivity(startHomescreen);
                    }
                })       .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // do nothing
                    }
                })
                .setIcon(android.R.drawable.ic_dialog_alert)
                .show();

context.startActivity(startHomescreen);

context.startActivity(startHomescreen);