Android Question kiosk-mode variant

Sub Activity_Create(FirstTime As Boolean)
   Dim jo As JavaObject
   jo.InitializeContext
   jo.RunMethod("lockScreen", Null)
End Sub

#if Java
import android.content.Context;
import android.graphics.PixelFormat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.View.OnKeyListener;
import android.widget.RelativeLayout;
public void lockScreen() {
 RelativeLayout mRl = new RelativeLayout(this);
    mRl.setBackgroundColor(0x80000000);
    mRl.setOnKeyListener(new OnKeyListener(){

    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
    Log.d("LockScreen", "keyCode = "+keyCode);
    return true;
    }

    });

    WindowManager.LayoutParams mParams = new WindowManager.LayoutParams(
    WindowManager.LayoutParams.FILL_PARENT,
    WindowManager.LayoutParams.FILL_PARENT,
    WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,

    // Draws over status bar
    WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
    | WindowManager.LayoutParams.FLAG_FULLSCREEN,
    PixelFormat.TRANSLUCENT);
    WindowManager
    mWindowManager = (WindowManager) this
    .getSystemService(Context.WINDOW_SERVICE);
    mWindowManager.addView(mRl, mParams);
   }
#End If

AddPermission(android.permission.SYSTEM_ALERT_WINDOW)