android - Explain the code beow -


i learning how use listview in android development. example uses list of contacts on user's phone. there code, cant figure out. appreciated.

static final string selection = "((" +          contactscontract.data.display_name + " notnull) , (" +         contactscontract.data.display_name + " != '' ))";

i can't figure out doing. tutorial android.dev.com thank you

that tutorial using cursorloader dinamically retrieve data database , use fill views in list view.

that string search criteria... tells cursorloader content must retrieve database.


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