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"/>