由联系人失去号码

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    /** Layouting */
    this.mGetMobileNumberButton = (Button)findViewById(R.id.getMobileNumberButton);
    this.mNameTextView = (TextView)findViewById(R.id.nameTextView);
    this.mMobileNumberTextView = (TextView)findViewById(R.id.mobileNumberTextView);


    /** onClick getContactInfos*/
   this.mGetMobileNumberButton.setOnClickListener(new OnClickListener() {
      public void onClick(View v){ 
          Intent intent = new Intent(Intent.ACTION_PICK, ContactsContract.Contacts.CONTENT_URI);
          startActivityForResult(intent, 1);        
      } 
    });
}

@Override
public void onActivityResult(int reqCode, int resultCode, Intent data) {
    super.onActivityResult(reqCode, resultCode, data);
    if (resultCode == Activity.RESULT_OK) {
 Uri uri = data.getData();
Cursor cursor=ctx.getContentResolver().query(uri, null, null, null, null);

   while (cursor.moveToNext()) { 
   String contactId = cursor.getString(cursor.getColumnIndex( 
     ContactsContract.Contacts._ID)); 
   String hasPhone = cursor.getString(cursor.getColumnIndex( 
     ContactsContract.Contacts.HAS_PHONE_NUMBER)); 
   if (Boolean.parseBoolean(hasPhone)) { 
                // You know have the number so now query it like this
Cursor phones = getContentResolver().query( 
  ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
  null, 
  ContactsContract.CommonDataKinds.Phone.CONTACT_ID +" = "+ contactId, 
      null, null); 
    while (phones.moveToNext()) { 
     String phoneNumber = phones.getString( 
       phones.getColumnIndex( 
         ContactsContract.CommonDataKinds.Phone.NUMBER));                 
    } 
    phones.close(); 
   } 
 }