Hide a preference screen in android

问题:

I have a preference xml ..

first im loading the preferences from an XML resource

 addPreferencesFromResource(R.xml.preferences); 

and setting some default values to it... After setting the default values , i need to hide (not to remove) one of my preference screen

My preference XML is

<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Preference
                android:title="Account Settings"
                 android:key="customPref" />

    <PreferenceScreen android:title="@string/account_1"
                    android:key="account">
            <EditTextPreference
                android:key="username"
                android:title="@string/settings_username"
                android:singleLine="true" />
            <EditTextPreference
                android:key="password"
                android:title="@string/settings_password"
                android:password="true"
                android:singleLine="true" />
                </PreferenceScreen>


    <PreferenceScreen android:title="@string/account_2"
                android:key="account1">
            <EditTextPreference
                android:key="username1"
                android:title="@string/settings_username"
                android:singleLine="true" />
            <EditTextPreference
                android:key="password1"
                android:title="@string/settings_password"
                android:password="true"
                android:singleLine="true" />
                </PreferenceScreen>
</PreferenceScreen>

I need to hide the PreferenceScreen having

title ="@string/account_2

回答1:

easy as:

Preference preference = (Preference) findPreference("pref");
PreferenceScreen preferenceScreen = (PreferenceScreen) findPreference("pref_screen");
PreferenceCategory preferenceCategory = (PreferenceCategory) findPreference("pref_category");

To hide the Preference:

PreferenceGroup preferenceParent = getParent(preference);
preferenceParent.removePreference(preference);

To hide the PreferenceScreen:

PreferenceGroup preferenceScreenParent = getParent(preferenceScreen);
preferenceScreenParent.removePreference(preferenceScreen);

To hide the PreferenceCategory:

PreferenceGroup preferenceCategoryParent = getParent(preferenceCategory);
preferenceCategoryParent.removePreference(preferenceCategory);

And the same manner goes to EditTextPreference, CheckBoxPreference, .....

回答2:

You can duplicate your XML. Then remove the second part like this:

<PreferenceScreen
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Preference
                android:title="Account Settings"
                 android:key="customPref" />

    <PreferenceScreen android:title="@string/account_1"
                    android:key="account">
            <EditTextPreference
                android:key="username"
                android:title="@string/settings_username"
                android:singleLine="true" />
            <EditTextPreference
                android:key="password"
                android:title="@string/settings_password"
                android:password="true"
                android:singleLine="true" />
                </PreferenceScreen>
</PreferenceScreen>

Then you check your preference to see if it has already been initialized.

If yes, you load the XML above, otherwise the first one.

回答3:

If you have a reference to both the Preference, and its parent (a PreferenceCategory, or PreferenceScreen)

myPreferenceScreen.remove(myPreference);