3 SIMPLE STEPS IN ANDROID TO ACCESS CONTACTS

This post helps you to access contacts in android and get the selected phone number from the contacts


Step 1: Create your User Interface using layout file


For this example two controls are required, A EditText field named phoneno to display selected phone number and a Button named Contacts to launch contact picker.
<RelativeLayout
        android:id="@+id/relativeLayout3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <EditText  
        android:layout_height="wrap_content"  
        android:id="@+id/phoneno"  
        android:inputType="text|phone"  
        android:layout_width="wrap_content"  
        android:layout_toLeftOf="@+id/Contacts"  
        android:layout_alignParentLeft="true"></EditText>  
    <Button  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:id="@+id/Contacts"  
        android:text="Contacts"  
        android:layout_alignParentRight="true" 
        android:onClick="doLaunchContactPicker"></Button>  
    </RelativeLayout>

Step 2: doLaunchContactPicker will launch the contacts. Here's code for its implementation
import android.provider.ContactsContract.CommonDataKinds.Phone;

import android.provider.ContactsContract.Contacts;  

[Import statements are must]

private static final int CONTACT_PICKER_RESULT = 1001;

public void doLaunchContactPicker(View view) 

    {  

        Intent contactPickerIntent = new Intent(Intent.ACTION_PICK,Contacts.CONTENT_URI);  

        startActivityForResult(contactPickerIntent, CONTACT_PICKER_RESULT);  

        

    }

 Intent is used along with the startActivityForResult() method to launch another Android application and retrieve the result.  

Step 3: Handle results by implementing onActivityResult()

1. protected void onActivityResult(int requestCode, int resultCode, Intent data) 
2.     {  
3.      String phone="";
4.      Cursor contacts=null;
5.      try
6.      {
7.         if (resultCode == RESULT_OK) 
8.         {  
9.             switch (requestCode) 
10.             {  
11.             case CONTACT_PICKER_RESULT:  
12.                 // gets the uri of selected contact
13.              Uri result = data.getData();
14.              // get the contact id from the Uri (last part is contact id) 
15.              String id = result.getLastPathSegment(); 
16.                  //queries the contacts DB for phone no
17.              contacts=getContentResolver().query(Phone.CONTENT_URI, null, Phone.CONTACT_ID + "=?", new String[] { id },  null);
18.                 //gets index of phone no
19.              int phoneIdx = contacts.getColumnIndex(Phone.DATA); 
20.              if (contacts.moveToFirst()) 
21.              {
22.                    //gets the phone no  
23.                    phone = contacts.getString(phoneIdx);  
24.                    EditText phoneTxt=(EditText)findViewById(R.id.phoneno);
25.                    //assigns phone no to EditText field phoneno
26.                    phoneTxt.setText(phone);                   
27.                 } 
28.              else 
29.              {  
30.              Toast.makeText(this, "error", 100).show();
31.                 }  
32.              break;  
33.             }  
34.       
35.         } 
36.         else 
37.         {  
38.             // gracefully handle failure  
39.             Toast.makeText(this, "Warning: activity result not ok",50).show();  
40.         }  
41.     }
42.      catch (Exception e) 
43.      {  
44.         Toast.makeText(this, e.getMessage(), 50).show();  
45.         } 
46.      finally 
47.      {  
48.         if (contacts != null) 
49.         {  
50.             contacts.close();  
51.         }
52.      }
53.     }

NOTE: For detailed explanation on this topic visit http://mobile.tutsplus.com/tutorials/android/android-essentials-using-the-contact-picker/