How to block (intercept) The Home button and other buttons in the Android App

Write an Acitivity, as shown below:
Key Aspect 1: block the HOME button and set FLAG_HOMEKEY_DISPATCHED in onAttachedToWindow.
Key Aspect 2: shield the buttons except Power and Home, overwrite the dispatchKeyEvent method, and return true.
Public class LockByKeyGuard extends Activity {
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. main );
}
@ Override
Public void onAttachedToWindow (){
// Key: Set FLAG_HOMEKEY_DISPATCHED in onAttachedToWindow.
This. getWindow (). addFlags (WindowManager. LayoutParams. FLAG_HOMEKEY_DISPATCHED );
Super. onAttachedToWindow ();
}
 
@ Override
Public boolean dispatchKeyEvent (KeyEvent event ){
// Return true without responding to other keys
Return true;
}