NumberPicker is set to the characters "Off" and a number between 1 and 60.
The soft keyboard when you press and hold this NumberPicker is in Japanese character input mode.
I want to set the initial display value of this soft keyboard to numeric input mode, but I don't know how.

<NumberPicker
            android: id = "@ + id/np_fadeIn"
            android: layout_width = "wrap_content"
            android: layout_height = "wrap_content"
            android: theme = "@ style/PickerText"
            android: layout_marginLeft = "20dp"
            android: layout_marginRight = "20dp"
            android: layout_gravity = "center" />

// initial setting of number picker
        np_fadeIn = layout.findViewById (R.id.np_fadeIn);
        // Set the number picker
        String [] pref;
        pref = new String [61];
        pref [0] = getString (R.string.off);
        for (int i = 1;i<= 60;i ++) {
            pref [i] = String.valueOf (i);
        }
        // Specify minimum and maximum array index
        np_fadeIn.setMinValue (0);
        np_fadeIn.setMaxValue (60);
        // Set the array to numberPicker
        np_fadeIn.setDisplayedValues ​​(pref);

Android Studio3.4
API level 14 to 28