OnScreen keyboard opens automatically when Activity starts

If you want to do it editing the AndroidManifest:

        <activity
        android:name=".Dades"
        android:label="@string/app_name" 
        android:windowSoftInputMode="stateHidden">

the line android:windowSoftInputMode="stateHidden" is the one that prevents the keyboard focus.

Android opens the OnScreenKeyboard automatically if you have an EditText focussed when the Activity starts.

You can prevent that by adding following into your Activity's onCreate method.

 getWindow().setSoftInputMode(
    WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);