<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 >

 <EditText 
 android:id="@+id/ed_smsVaild"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:hint="輸入驗證碼"/>
</LinearLayout>

public class MainActivity extends Activity {

 public static final int SMSCODE = 1 ;

 SmsObserver smsObserver;

 private EditText editText;
 /**
 * 一個handle用于更新主ui中的Edittext
 */
 private Handler mHandler = new Handler(){
 public void handleMessage(android.os.Message msg) {

  if (msg.what == SMSCODE) {
  String codeString = (String)msg.obj;
  editText.setText(codeString);
  }

 };
 };

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 editText = (EditText) findViewById(R.id.ed_smsVaild);
 //創(chuàng)建內(nèi)容觀察者的對象
 smsObserver = new SmsObserver(MainActivity.this, mHandler);
 //短信的uri為content://sms
 Uri uri = Uri.parse("content://sms");
 //注冊內(nèi)容觀察者
 this.getContentResolver().registerContentObserver(uri, true, smsObserver);
 }
 /**
 * 不用的時候?qū)?nèi)容觀察者手動撤銷
 */
 @Override
 protected void onPause() {
 getContentResolver().unregisterContentObserver(smsObserver);
 }


}

public class SmsObserver extends ContentObserver{

 private Context mContext;
 private Handler mHandler;

 /**
 * 實現(xiàn)構(gòu)造方法，context用于獲得上下文，handle用于發(fā)送消息，便于更新ui
 * @param context
 * @param handler
 */
 public SmsObserver(Context context,Handler handler){
 super(handler);
 this.mContext = context;
 this.mHandler = handler;
 }

 /**
 * 重寫onchange()方法
 */
 @Override
 public void onChange(boolean selfChange, Uri uri) {

 String code = "";

 Log.i("Info", "sms has changed");
 Log.i("Info", uri.toString());
 /**
  * 當(dāng)uri的內(nèi)容為content://sms/raw時，這個短信是不存在數(shù)據(jù)庫中的，
  * 只有第二次的時候才寫入數(shù)據(jù)庫
  */
 if (uri.toString().equals("content://sms/raw")) {
  return;
 }
 //收件箱的uri
 Uri inboxUri = Uri.parse("content://sms/inbox");
 //查詢短信，按時間降序進行排序
 Cursor cursor = mContext.getContentResolver().query(inboxUri, null, null, null, "date desc");
 if (cursor != null) {
  if (cursor.moveToFirst()) {
  //讀出發(fā)件人和短信內(nèi)容
  String address = cursor.getString(cursor.getColumnIndex("address"));
  String body = cursor.getString(cursor.getColumnIndex("body"));
  Log.i("info", "發(fā)件人為："+address +""+"短信內(nèi)容為"+body);
  //正則表達式d{6}的意思是連續(xù)6位是數(shù)字的就提取出來
  Pattern pattern = Pattern.compile("(\\d{6})");
  //對短信的內(nèi)容進行匹配
  Matcher matcher = pattern.matcher(body);
  if (matcher.find()) {
   code = matcher.group(0);
   Log.i("Info", code);
   //將code發(fā)送到主線程
   Message msMessage = new Message();
   msMessage.what = MainActivity.SMSCODE;
   msMessage.obj = code;
   mHandler.sendMessage(msMessage);
  }
  }
  cursor.close();

 }
 }

}

if(!address.equals("XXXXXXXXXXXX")){
 return;
}