Disabling Activity (after verifying purchase)

gistfile1.java

try {
    ComponentName componentName = new ComponentName(getPackageName(), YourActivity.class.getName());
    PackageManager packageManager = getApplicationContext().getPackageManager();
    if (licenseState == LICENSE_VALID) {
        if (packageManager.getComponentEnabledSetting(componentName) != PackageManager.COMPONENT_ENABLED_STATE_DISABLED) {
            packageManager.setComponentEnabledSetting(componentName, PackageManager.COMPONENT_ENABLED_STATE_DISABLED, PackageManager.DONT_KILL_APP);
        }
    } else if (licenseState == LICENSE_INVALID) {
        packageManager.setComponentEnabledSetting(componentName, PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
    }
} catch (Exception ex) {
    // Be sure to trap any and all potential issues with the above code.
    // It's not critical that it succeeds.
    Log.d(TAG, "Disabling component failed", ex);
}