public class MsgcontactActivity extends Activity {

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);  
}

EditText phoneTxt;
TextView tv;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    tv=(TextView) findViewById(R.id.textView1);
    String xx=phoneTxt.getText().toString();
    Toast.makeText(getApplicationContext(), xx,Toast.LENGTH_LONG ).show();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
{  
     String phone="";
     Cursor contacts=null;
     try
     {
        if (resultCode == RESULT_OK) 
        {  
            switch (requestCode) 
            {  
                case CONTACT_PICKER_RESULT:  
                    Uri result = data.getData();
                    String id = result.getLastPathSegment(); 
                    contacts=getContentResolver().query(Phone.CONTENT_URI, null, Phone.CONTACT_ID + "=?", new String[] { id },  null);
                    int phoneIdx = contacts.getColumnIndex(Phone.DATA); 
                    if (contacts.moveToFirst()) 
                    {
                       phone = contacts.getString(phoneIdx);  
                       EditText phoneTxt=(EditText)findViewById(R.id.phoneno);
                       phoneTxt.setText(phone);
                    } 
                    else 
                    {  
                       Toast.makeText(this, "error", 100).show();
                    }  
                    break;  
                }
            }
            else 
            {
                Toast.makeText(this, "Warning: activity result not ok",50).show();
            }  
        }
        catch (Exception e) 
        {  
            Toast.makeText(this, e.getMessage(), 50).show();  
        } 
        finally 
        {  
            if (contacts != null) 
            {  
                contacts.close();  
            }
        }
    }
}
	
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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"/>
<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"/>
<TextView 
    android:text="TextView" 
    android:layout_width="wrap_content" 
    android:id="@+id/textView1" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/phoneno" 
    android:layout_alignParentLeft="true"/>