Disabling home-button-slide to search by Google now.

As I trying to make an android app for my autism kid, I wanted to disable any button to escape the app without inserting password.
I killed homebutton as making it to be a HOME application, I found that my kid sometimes accidentally wonders into other apps through google search by sliding home button.
I finally disables (or rather overwrites) it by capturing its intent.
The trick is very easy. Just add one line to AndroidManifest.
<intent-filter>
  <action always="always" android:name="android.intent.action.ASSIST />
    ....
First time adding this, sliding home button makes you to choose what to do, so choose your own app and makes it "always".

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