Icon pack makers wanting to implement 'apply icon pack' functionality for Action Launcher should just include this snippet as appropriate.

gistfile1.txt

Button actionLauncherButton = (Button) findViewById(R.id.action_launcher_button);
actionLauncherButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        // Check Action Launcher is installed
        Intent intent = getPackageManager().getLaunchIntentForPackage("com.actionlauncher.playstore");
        if (intent != null) {
            // TODO BY YOU: set this package name as appropriate. Eg "kov.theme.stark"
            String yourPackageName = ;
            intent.putExtra("apply_icon_pack",yourPackageName);
            startActivity(intent);    // Action Launcher will take it from here...
        } else {
            // Direct users to get Action Launcher Pro
            String playStoreUrl = "https://play.google.com/store/apps/details?id=com.actionlauncher.playstore";
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(playStoreUrl)));
        }
    }
});