Read contacts based on the first character of the contact name

1  Packagecom.zzw.contacts;2 3 Importjava.util.ArrayList;4 5 Importandroid.app.ListActivity;6 ImportAndroid.content.ContentResolver;7 ImportAndroid.content.Context;8 ImportAndroid.database.Cursor;9 ImportAndroid.net.Uri;Ten ImportAndroid.os.Bundle; One Importandroid.provider.ContactsContract; A ImportAndroid.view.LayoutInflater; - ImportAndroid.view.View; - ImportAndroid.view.ViewGroup; the ImportAndroid.widget.ArrayAdapter; - ImportAndroid.widget.ListView; - ImportAndroid.widget.TextView; -  +  Public classMainactivityextendslistactivity { -  + @Override A     protected voidonCreate (Bundle savedinstancestate) { at         Super. OnCreate (savedinstancestate); -         //Setcontentview (r.layout.activity_main); -  -arraylist<contact> contacts =NewArraylist<contact>(); - readcontacts (contacts); -  inListView ListView = This. Getlistview (); -  toarrayadapter<contact> adapter =NewMyadapter ( This, Android. R.layout.simple_list_item_2, contacts); + Listview.setadapter (adapter); -     } the  *     Private classMyadapterextendsArrayadapter<contact> { $ Panax Notoginseng         Private intresource; -         PrivateLayoutinflater Inflater; the         PrivateArraylist<contact>contacts; +  A          PublicMyadapter (Context context,intResource, arraylist<contact>contacts) { the             Super(context, resource, contacts); +              This. Resource =resource; -              This. Contacts =contacts; $Inflater =(Layoutinflater) Getsystemservice (context.layout_inflater_service); $         } -  - @Override the          Public intGetCount () { -             returncontacts.size ();Wuyi         } the  - @Override Wu          PublicContact GetItem (intposition) { -             returnContacts.get (position); About         } $  - @Override -          PublicView GetView (intposition, View Convertview, ViewGroup parent) { -  A             if(Convertview = =NULL) { +Convertview = inflater.inflate (Resource,NULL); the             } -  $Contact Contact =GetItem (position); the  theTextView Text1 =(TextView) Convertview.findviewbyid (Android. R.ID.TEXT1); theTextView Text2 =(TextView) Convertview.findviewbyid (Android. R.ID.TEXT2); the  -             //the first character, the basis of the grouping in Text1.settext (Contact.firstletterofname ()); the  the             //Details AboutText2.settext (Contact.name + "" +contact.getphonenumbers ()); the             returnConvertview; the         } the  +     } -  the     //General method for reading device contacts. The approximate process is this, the templated operation code. Bayi     Private voidReadcontacts (arraylist<contact>contacts) { theUri uri = uri.parse ("Content://com.android.contacts/contacts"); theContentresolver resolver = This. Getcontentresolver (); -  -         //here we pass in a sort_key_primary to query the         //tell Contentresolver the results are sorted alphabetically by the first letter of the contact name thecursor cursor = resolver.query (URI,NULL,NULL,NULL, the Android.provider.ContactsContract.Contacts.SORT_KEY_PRIMARY); the  -          while(Cursor.movetonext ()) { the             //Contact ID theString ID =cursor.getstring (Cursor.getcolumnindex (android.provider.contactscontract.contacts._id)); the             //Sort key, the read contact is grouped by name from A->z94String sork_key_primary =cursor the . GetString (Cursor.getcolumnindex (Android.provider.ContactsContract.Contacts.SORT_KEY_PRIMARY));  the             //get name of contact person theString name =cursor98 . GetString (Cursor.getcolumnindex (Android.provider.ContactsContract.Contacts.DISPLAY_NAME)); About  -Contact Mcontact =NewContact ();101Mcontact.id =ID;102Mcontact.sort_key_primay =sork_key_primary;103Mcontact.name =name;104  the             //get the phone number of the contact person106Cursor phone = resolver.query (ContactsContract.CommonDataKinds.Phone.CONTENT_URI,NULL,107ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + ID,NULL,NULL);108             //Get a phone number (there may be multiple numbers)109             //because under the same name, the user may have more than one number the             //Traverse111Arraylist<string> phonenumbers =NewArraylist<string>(); the              while(Phone.movetonext ()) {113                 intPhonefieldcolumnindex =Phone.getcolumnindex (ContactsContract.CommonDataKinds.Phone.NUMBER); theString PhoneNumber =phone.getstring (phonefieldcolumnindex); the Phonenumbers.add (phonenumber); the             }117 118Mcontact.phonenumbers =phonenumbers;119 Contacts.add (mcontact); -         }121     }122 123     //used to mount data read from the contact database. 124     //structured data for easy data manipulation and access.  the     Private classContact {126          PublicString ID;127          PublicString name; -          PublicString Sort_key_primay;129          PublicArraylist<string>phonenumbers; the 131         //get the first letter of a contact's first name.  the         //For example, if a person's name is "Android", then this person's initials are: a133          PublicString Firstletterofname () {134String s = Sort_key_primay.charat (0) + "";135 136             returns.touppercase ();137         }138 139          PublicString getphonenumbers () { $String phones = "";141              for(inti = 0; I < phonenumbers.size (); i++) {142Phones + = ":" +Phonenumbers.get (i);143             }144             returnphones;145         }146     }147}

Permissions:

1 <!--  - 2     <android:name= " Android.permission.WRITE_CONTACTS "/>3     <!---- >4     <android:name= "Android.permission.READ_ CONTACTS "/>

Read contacts based on the first character of the contact name