1.主界面代碼（activity_main.xml）：
<TextView android:id="@+id/et_validateCode" android:layout_width="wrap_content" android:layout_height="wrap_content" android:hint="請輸入驗證碼" android:textSize="30dp" />2.這里面寫了在你指定的號碼發來的短信截取驗證碼（MainActivity.java）:
@Override PRotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = (TextView) findViewById(R.id.et_validateCode); handler = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); Bundle bundle=msg.getData(); textView.setText(bundle.getString("number")); } }; this.getContentResolver().registerContentObserver(Uri.parse("content://sms"),true,new MyObserver(handler)); }//繼承ContentObserver 必須重載一個onChange去處理回調 class MyObserver extends ContentObserver{ public MyObserver(Handler handler) { super(handler); } @Override public void onChange(boolean selfChange) { Cursor cursor=MainActivity.this.getContentResolver().query(Uri.parse("content://sms/inbox"),null,null,null,"date desc"); if(cursor!=null) { if (cursor.moveToNext()) { //我在這里寫的一個死的電話號，判斷是否是這個手機號，然后在判斷是有否有（驗證碼） if (cursor.getString(cursor.getColumnIndex("address")).equals("+8615074833565") && cursor.getString(cursor.getColumnIndex("body")).contains("驗證碼")) { String date = cursor.getString(cursor.getColumnIndex("body")); int star = date.indexOf(":"); //在這里判斷要截取多少位 String data = date.substring(star + 1, star + 5); Message ms = new Message(); Bundle bundle = new Bundle(); bundle.putString("number", data); ms.setData(bundle); handler.sendMessage(ms); } } } } }3.記得要加短信的權限：
<uses-permission android:name="android.permission.RECEIVE_SMS"></uses-permission> <uses-permission android:name="android.permission.READ_SMS"/>新聞熱點
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