Android采取ContentObserver方式自动获取验证码

/**
 * Created by weifeiyang on 2016/7/29 0029.
 */

import android.app.Activity;
import android.content.SharedPreferences;
import android.database.ContentObserver;
import android.database.Cursor;
import android.net.Uri;
import android.os.Handler;
import android.text.TextUtils;
import android.widget.EditText;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 读取短信验证码，并设置验证码
 * Created by cool on 2016/1/4.
 */
public class ReadSmsContent extends ContentObserver {
 private Cursor cursor = null;
 private Activity mActivity;
 private EditText mEditText;

 public ReadSmsContent(Handler handler, Activity activity, EditText editText) {
  super(handler);
  this.mActivity = activity;
  this.mEditText = editText;
 }

 @Override
 public void onChange(boolean selfChange, Uri uri) {

 /*
  第一次回调 不是我们想要的 直接返回
  目前发现每次收到新短信都会走好几次onChange(),
  可以通过这个方法来使得onChange中的方法只走一次
 */
  if (uri.toString().equals("content://sms/raw")) {
   return;
  }

  /*
   读取收件箱中的短信

   address 发件人手机号码:
   body 信息内容:
   read 是否查看:
   date 发送时间:
   */
  cursor = mActivity.getContentResolver().query(Uri.parse("content://sms/inbox"),
    new String[]{"_id", "address", "body", "read"}, null, null, "_id desc");//按降序排列

//  指定号码
//  mActivity.managedQuery(Uri.parse("content://sms/inbox"),
//    new String[]{"_id", "address", "body", "read"}, "address=? and read=?", new String[]{"10086", "0"}, "_id desc");

  if (null != cursor && cursor.getCount() > 0) {
   cursor.moveToNext();//指向首位
   int smsbodyColumn = cursor.getColumnIndex("body");//body位置
   String smsBody = cursor.getString(smsbodyColumn);//获取内容
   String verifyCode = getDynamicPassword(smsBody);
   if (TextUtils.isEmpty(verifyCode)) {
    return;
   }
   if (mEditText == null) {
    throw new RuntimeException("你传的EditText为空");
   }
   if (verifyCode.contains("你从服务器上获取到的验证码"))) {
    mEditText.setText(verifyCode);
    //EditText获取焦点，3个属性必须同时设置
    mEditText.setFocusable(true);
    mEditText.setFocusableInTouchMode(true);
    mEditText.requestFocus();
    mEditText.setSelection(verifyCode.length());//设置光标位置
   }

  }
  if (!cursor.isClosed()) {
   cursor.close();
  }
 }

 /**
  * 从字符串中截取连续4位数字
  * 用于从短信中获取动态密码
  *
  * @param str 短信内容
  * @return 截取得到的4位动态密码
  */
 public static String getDynamicPassword(String str) {
  Pattern continuousNumberPattern = Pattern.compile("[0-9\\.]+");
  Matcher m = continuousNumberPattern.matcher(str);
  String dynamicPassword = "";
  while (m.find()) {
   if (m.group().length() == 4) {
    dynamicPassword = m.group();
   }
  }

  return dynamicPassword;
 }
}

 /**
  * 初始化短信监听数据库
  */
 private void initSmSContentObserver() {
  readSmsContent = new ReadSmsContent(new Handler(), this, seCodeEditText);
  //注册短信内容监听
  this.getContentResolver().registerContentObserver(Uri.parse("content://sms/"), true, readSmsContent);

 }