How to enable and disable a component?

Question

My initial question was basically something along the lines of this: Clearing and setting the default home application

That question was answered to my satisfaction,

Answer 1

By using package manager you can enable or disable component declared in manifest file There are two flag PackageManager.COMPONENT_ENABLED_STATE_DISABLED for disable component and PackageManager.COMPONENT_ENABLED_STATE_ENABLED for enable component.

PackageManager pm = getApplicationContext().getPackageManager();
ComponentName componentName = new ComponentName("com.app",
    ".broadcast_receivers.OnNetworkChangedReceiver");
pm.setComponentEnabledSetting(componentName,
    PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
    PackageManager.DONT_KILL_APP);

Android manifest:

Official documentation: setComponentEnabledSetting