Javascript for window.print is not working in WebView

Hi, i had create a Xamarin PCL project and I add WebView in my main page. I test my android phone and run the webview to test, it work but till when I click on print button, it didn't response anything, I only get the error message is "I/HwSecImmHelper(32681): mSecurityInputMethodService is null" and I already set the permission as below:
uses-permission android:name="android.permission.BIND_PRINT_SERVICE"
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
uses-permission android:name="android.permission.INTERNET"
uses-permission android:name="android.permission.BIND_INPUT_METHOD"
but still cannot display print dialog, I try chrome app, it enable to prompt out the printer dialog...

Can anyone help me on this?

Thanks for advanced.