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* 1.自定义监听类*

/** 
* 短信**，用于自动填充验证码 
*/  
public class SMSContentObserver extends ContentObserver {  

    public final String SMS_URI_INBOX = "content://sms/inbox";//收信箱  
    private Activity activity = null;  
    private String smsContent = "";//验证码  
    private EditText verifyText = null;//验证码编辑框  
    private String SMS_ADDRESS_PRNUMBER = "10690329013589";//短息发送提供商  
    private String smsID = "";  
    //短信观察者 收到一条短信时 onchange方法会执行两次，所以比较短信id，如果一致则不处理  
    public SMSContentObserver(Activity activity, Handler handler, EditText verifyText) {  
        super(handler);  
        this.activity = activity;  
        this.verifyText = verifyText;  
    }  

    @Override  
    public void onChange(boolean selfChange) {  
        super.onChange(selfChange);  
        Cursor cursor = null;// 光标  
        // 读取收件箱中指定号码的短信  
        cursor = activity.getContentResolver().query(Uri.parse(SMS_URI_INBOX),  
            new String[]{"_id", "address", "body", "read"}, //要读取的属性  
            "address=? and read=?", //查询条件是什么  
            new String[]{SMS_ADDRESS_PRNUMBER, "0"},//查询条件赋值  
            "date desc");//排序  

        if (cursor != null) {  
            cursor.moveToFirst();  
            if (cursor.moveToFirst()) {  
                //比较和上次接收到短信的ID是否相等  
                if (!smsID.equals(cursor.getString(cursor.getColumnIndex("_id")))) {  
                    String smsbody = cursor.getString(cursor.getColumnIndex("body"));  
                    //用正则表达式匹配验证码  
                    Pattern pattern = Pattern.compile("[0-9]{6}");  
                    Matcher matcher = pattern.matcher(smsbody);  
                    if (matcher.find()) {//匹配到6位的验证码  
                        smsContent = matcher.group();  
                        if (verifyText != null && null != smsContent && !"".equals(smsContent)) {  
                            verifyText.requestFocus();//获取焦点  
                            verifyText.setText(smsContent);//设置文本  
                            verifyText.setSelection(smsContent.length());//设置光标位置  
                        }  
                    }  
                    smsID = cursor.getString(cursor.getColumnIndex("_id"));  
                }  
            }  
        }  

    }  

}  

2.在登录页面事件化监听类

Java代码

//实例化短信**  
SMSContentObserver mObserver = new SMSContentObserver(getActivity(), new Handler(), mEt_auth_code);  
// 注册短信变化监听  
mContext.getContentResolver().registerContentObserver(Uri.parse("content://sms/"), true, mObserver);  

> 3.声明读取短信权限

<uses-permission android:name="android.permission.RECEIVE_SMS" />  
<uses-permission android:name="android.permission.READ_SMS" />  
<uses-permission android:name="android.permission.WRITE_SMS" />  

4.为了防止内存泄漏，记得注销监听

Java代码

@Override  
public void onDestroy() {  
super.onDestroy();  
   //注销短信监听       
   mContext.getContentResolver().unregisterContentObserver(mObserver);  
}  

小结：

去短信库获取短信比较不容易被拦截