in android code
i want fetch contact's name,email , phone number as json , want display.
here code:
public class mainactivity extends activity { public textview outputtext; string[] phonenumber; string[] email; string name; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); outputtext = (textview) findviewbyid(r.id.textview1); try { //fetchcontacts(); outputtext.settext(fetchcontacts()); } catch (jsonexception e) { // todo auto-generated catch block e.printstacktrace(); } } public string fetchcontacts() throws jsonexception { uri content_uri = contactscontract.contacts.content_uri; string _id = contactscontract.contacts._id; string display_name = contactscontract.contacts.display_name; string has_phone_number = contactscontract.contacts.has_phone_number; uri phonecontent_uri = contactscontract.commondatakinds.phone.content_uri; string phone_contact_id = contactscontract.commondatakinds.phone.contact_id; string number = contactscontract.commondatakinds.phone.number; uri emailcontent_uri = contactscontract.commondatakinds.email.content_uri; string emailcontact_id = contactscontract.commondatakinds.email.contact_id; string data = contactscontract.commondatakinds.email.data; contentresolver contentresolver = getcontentresolver(); cursor cursor = contentresolver.query(content_uri, null, null, null, null); list<contact> contacts = new arraylist<contact>(); gson gson = new gson(); // loop every contact in phone if (cursor.getcount() > 0) { while (cursor.movetonext()) { string contact_id = cursor .getstring(cursor.getcolumnindex(_id)); name = cursor.getstring(cursor.getcolumnindex(display_name)); int hasphonenumber = integer.parseint(cursor.getstring(cursor .getcolumnindex(has_phone_number))); if (hasphonenumber > 0) { int p = 0; // query , loop every phone number of contact cursor phonecursor = contentresolver.query( phonecontent_uri, null, phone_contact_id + " = ?", new string[] { contact_id }, null); while (phonecursor.movetonext()) { phonenumber[p] = phonecursor.getstring(phonecursor .getcolumnindex(number)); p++; } phonecursor.close(); int q = 0; // query , loop every email of contact cursor emailcursor = contentresolver.query( emailcontent_uri, null, emailcontact_id + " = ?", new string[] { contact_id }, null); while (emailcursor.movetonext()) { email[q] = emailcursor.getstring(emailcursor .getcolumnindex(data)); q++; } emailcursor.close(); contacts.add(new contact(name, phonenumber, email)); } } } return gson.tojson(contacts); } } but getting nullpointer exception error :
java.lang.runtimeexception: unable start activity componentinfo{com.example.contactdemo/com.example.contactdemo.mainactivity}: java.lang.nullpointerexception error found in below line of code:
phonenumber[p] = phonecursor.getstring(phonecursor.getcolumnindex(number)); here storing phonenumber , email array.is there array initialization problem ?? idea guys?
you can use these approach finds contact contact list
class fetchdevicecontact extends asynctask<void, integer, string> { protected void onpreexecute (){ constant.showprogressdialog(adddevicecontactscreeen.this); } protected string doinbackground(void...arg0) { arraylist.clear(); contentresolver cr = adddevicecontactscreeen.this.getcontentresolver(); cursor cur = adddevicecontactscreeen.this.getcontentresolver().query(contactscontract.contacts.content_uri, null, null, null, null); while (cur.movetonext()) { string id = cur.getstring(cur.getcolumnindex(contactscontract.data._id)); string name = cur.getstring(cur.getcolumnindex(contactscontract.data.display_name)); string photouri = cur.getstring(cur.getcolumnindex(contactscontract.data.photo_thumbnail_uri)); bitmap my_btmp = bitmapfactory.decoderesource(getresources(), r.drawable.ic_arrow_up_blue); string email = null; string phoneno = null; cursor phonecur = adddevicecontactscreeen.this.getcontentresolver().query(contactscontract.commondatakinds.phone.content_uri, null, contactscontract.commondatakinds.phone.contact_id + " = ?", new string[]{id}, null); if (photouri != null) { uri my_contact_uri = uri.parse(photouri); try { my_btmp = mediastore.images.media.getbitmap(adddevicecontactscreeen.this.getcontentresolver(), my_contact_uri); } catch (filenotfoundexception e) { // todo auto-generated catch block e.printstacktrace(); } catch (ioexception e) { // todo auto-generated catch block e.printstacktrace(); } } if (phonecur.getcount() > 0) { while (phonecur.movetonext()) { phoneno = phonecur.getstring(phonecur.getcolumnindex(contactscontract.commondatakinds.phone.number)); } } cursor emailcur = cr.query( contactscontract.commondatakinds.email.content_uri, null, contactscontract.commondatakinds.email.contact_id + " = ?", new string[]{id}, null); while (emailcur.movetonext()) { // contact names // = cur1.getstring(cur1.getcolumnindex(contactscontract.commondatakinds.email.data) email = emailcur.getstring(emailcur.getcolumnindex(contactscontract.commondatakinds.email.data)); if (email != null) { system.out.println("email============== :" + email); } } emailcur.close(); contactbean bean = new contactbean(); bean.setname(name); bean.setemail(email); bean.setimage(my_btmp); bean.setphone_number(phoneno); if (phoneno == null || email == null) { } else { arraylist.add(bean); } } return ""; } protected void onprogressupdate(integer...a){ } protected void onpostexecute(string result) { constant.canceldialog(); } } new fetchdevicecontact().execute(); create getter , setter class it:-
public class contactbean { string name; string email; bitmap image; string phone_number; public string getname() { return name; } public void setname(string name) { this.name = name; } public string getemail() { return email; } public void setemail(string email) { this.email = email; } public bitmap getimage() { return image; } public void setimage(bitmap image) { this.image = image; } public string getphone_number() { return phone_number; } public void setphone_number(string phone_number) { this.phone_number = phone_number; } } 
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