java - How do I do "sub-categories" in Preferences -


i have preference page 3 options "indented" or sort of subcategories under "custom flashcards" preference. right under each other , seem different settings. how make seem subcategories of "custom flashcards" preference. 3 options become enabled when custom flashcards checked. thank you! 

<?xml version="1.0" encoding="utf-8"?> <preferencescreen xmlns:android="http://schemas.android.com/apk/res/android"> <   preferencecategory android:title="flashcard selection" android:key="flashcard_selection"> <checkboxpreference     android:key="all_flashcards"     android:summary="display flashcards"     android:title="all flashcards"     android:defaultvalue="true"      /> <checkboxpreference     android:key="custom_flashcards"     android:summary="display customized list of flashcards"     android:title="custom flashcards"     android:defaultvalue="false"/>     <checkboxpreference         android:key="red_flashcards"         android:dependency="custom_flashcards"         android:summary="display red flashcards"         android:title="red"         android:defaultvalue="false"         />     <checkboxpreference         android:key="yellow_flashcards"         android:summary="display yellow flashcards"         android:title="yellow"         android:defaultvalue="false"         android:dependency="custom_flashcards"         />     <checkboxpreference         android:key="green_flashcards"         android:summary="display green flashcards"         android:title="green"         android:defaultvalue="false"         android:dependency="custom_flashcards"         />     <listpreference         android:key="frontside_preference"         android:summary="choose want on front side"         android:title="front side"         android:entries= "@array/frontside_selection_array"         android:entryvalues ="@array/frontside_selection_values"         android:defaultvalue="1"  />    </preferencecategory>  </preferencescreen>

one option create subcategory use nested preference screen switching custom flashcards checkboxpreference tag preferencescreen tag , closing after 3 custom options. when custom flashcard option clicked, new screen appear 3 checkbox options.

<preferencecategory     android:key="flashcard_selection"     android:title="flashcard selection">     <checkboxpreference         android:defaultvalue="true"         android:key="all_flashcards"         android:summary="display flashcards"         android:title="all flashcards" />     <preferencescreen         android:defaultvalue="false"         android:key="custom_flashcards"         android:summary="display customized list of flashcards"         android:title="custom flashcards" >          <checkboxpreference             android:defaultvalue="false"             android:dependency="custom_flashcards"             android:key="red_flashcards"             android:summary="display red flashcards"             android:title="red" />         <checkboxpreference             android:defaultvalue="false"             android:dependency="custom_flashcards"             android:key="yellow_flashcards"             android:summary="display yellow flashcards"             android:title="yellow" />         <checkboxpreference             android:defaultvalue="false"             android:dependency="custom_flashcards"             android:key="green_flashcards"             android:summary="display green flashcards"             android:title="green" />       </preferencescreen>  </preferencecategory>


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