Android Read contacts

First Step: Register permissions

<uses-permission android:name= "Android.permission.READ_CONTACTS"/>

Step two: Receive the Model class

public class Contactmodel {    private String name;    Private arraylist<string > list;    Public String GetName () {        return name;    }    public void SetName (String name) {        this.name = name;    }    Public arraylist<string> getList () {        return list;    }    public void setlist (arraylist<string> list) {        this.list = list;    }}

Step Three: Mian--activity

public class Mainactivity extends appcompatactivity {private button button;    Private ListView ListView;    Static final String TAG = "mainactivity";    Arraylist<contactmodel>datalist = new arraylist<contactmodel> ();        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.activity_main);        ListView = (ListView) Findviewbyid (R.id.contrcts_view);        Readcontacts ();        Mainadapter adapter = new Mainadapter (this,datalist);    Listview.setadapter (adapter);           } private void Readcontacts () {cursor cursor = NULL;                       try {cursor = This.getcontentresolver (). Query (ContactsContract.Contacts.CONTENT_URI,               NULL, NULL, NULL, or NULL);               int contactidindex = 0;               int nameindex = 0; if (Cursor.getcount () > 0) {contactidindex = Cursor.getcolumnindex (Contactscontract.contacTS._ID);               Nameindex = Cursor.getcolumnindex (ContactsContract.Contacts.DISPLAY_NAME);               } Contactmodel model = NULL;                   while (Cursor.movetonext ()) {model = new Contactmodel ();                   String contactId = cursor.getstring (Contactidindex);                   String name = cursor.getstring (nameindex);//LOG.I (TAG, contactId);                   LOG.I (TAG, "==============:" + name);            Model.setname (name); /* * Find the contact's phone information */Cursor phones = this.getcontentresolver (). Query (CONTACTSC Ontract. CommonDataKinds.Phone.CONTENT_URI, NULL, Contactscontract.commondataki Nds.                   phone.contact_id + "=" + contactId, NULL, NULL);                   int phoneindex = 0; if (Phones.getcount () > 0) {phoneindex = Phones.getcolumnindeX (ContactsContract.CommonDataKinds.Phone.NUMBER);                   } ArrayList <string>list = new arraylist<string> ();                       while (Phones.movetonext ()) {String PhoneNumber = phones.getstring (Phoneindex);                       LOG.I (TAG, "==============:" + phonenumber);                   List.add (PhoneNumber);                   } model.setlist (list);               Datalist.add (model);           }}catch (Exception e) {log.e (tag,e.tostring ());               }finally {if (cursor! = NULL) {cursor.close (); }           }    }}

  Fourth Step: Adapter

public class Mainadapter extends Baseadapter {private context context;    Private list<contactmodel> List;        Public Mainadapter (context context, list<contactmodel>list) {this.context = context;    This.list = list;    } @Override public int getcount () {return this.list.size ();    } @Override public Object getItem (int i) {return this.list.get (i);    } @Override public long getitemid (int i) {return i;        } @Override public View getView (int i, view view, ViewGroup viewgroup) {Viewholder holder;            if (view = = null) {view = Layoutinflater.from (This.context). Inflate (R.layout.item_main,null);            Holder = new Viewholder ();            Holder.nametv = (TextView) View.findviewbyid (r.id.name);            Holder.phonetv = (TextView) View.findviewbyid (R.id.phone);        View.settag (holder);        }else{holder = (viewholder) view.gettag (); } Contactmodel model = this. List.get (i);        Holder.nameTV.setText (Model.getname ());       StringBuffer buffer = new StringBuffer ();           for (int j=0;j<model.getlist (). Size (); j + +) {if (j==0) {buffer.append (Model.getlist (). Get (j));           }else {buffer.append ("\ n" +model.getlist (). Get (j));        }} holder.phoneTV.setText (Buffer.tostring ());    return view;        } class viewholder{TextView Nametv;    TextView Phonetv; }}

Fifth Step: Item layout

<?xml version= "1.0" encoding= "Utf-8"? ><linearlayout xmlns:android= "http://schemas.android.com/apk/res/ Android "    android:layout_width=" match_parent "    android:layout_height=" wrap_content "    android:o rientation= "vertical" >    <textview        android:layout_width= "match_parent"        android:layout_height= " Wrap_content "        android:text=" Tom "        android:layout_margin=" 5DP "        android:id=" @+id/name "/>    < TextView        android:layout_width= "match_parent"        android:layout_height= "wrap_content"        android:text= "18580633453"        android:layout_margin= "5DP"        android:id= "@+id/phone"/>    <view        android: Layout_width= "Match_parent"        android:layout_height= "1DP"        android:background= "#d6d6d6"        /></ Linearlayout>

The layout of main is a ListView, and if not, I need to be quiet.

Android Read contacts