Question

I have defined the layout of my settings activity like this:

<?xml version="1.0" encoding="utf-8"?>

<PreferenceCategory 
    android:title="Second Category"
    android:key="second_category">

    <EditTextPreference
        android:id="@+id/pcnSetting"
        android:key="pcn"
        android:title="Set Canton Digits" 
        android:summary="Define your canton digits"
        android:dialogTitle="Set Canton Digits"
        android:dialogMessage="Please add your canton digits"
        android:inputType="number"
        android:imeOptions="actionDone"
        android:maxLength="4"/>

</PreferenceCategory>

I want to import the EditTextPreference to my java code, just to be sure that the user typed in at least and maximum 4 digits.

This is how I try to get the EditTextPreference into java

    canton = (EditTextPreference)findViewById(R.id.pcnSetting); 

But Eclipse gives me this error:

Cannot cast from View to EditTextPreference

Why does this happend? And how can I check if the user typed in at least and maximum 4 int's?

Answer 1

EditTextPreference is not a View, it is a preference. So you have to use findPreference() in your PreferenceActivity. You can then do EditTextPreference.getEdittext to get the view from this preference