截取短信验证码，实现自动填写验证码

一个小功能实现短线验证码验自动填写功能。

拿到这个功能时，首先需要怎么去拦截获取手机短信。就用观察着来观察系统里的短消息的数据库的变化，“表“内容观察者，只要数据库发生变化，都会出发该ContentObserver 的派生类。

  于是，首先需要一个SMSContentObserver的监听类：

import android.content.Context;import android.database.ContentObserver;import android.database.Cursor;import android.database.CursorIndexOutOfBoundsException;import android.net.Uri;import android.os.Handler;import net.panatrip.debugtoolbox.log.Log;import net.panatrip.biqu.manager.SMSManager;import java.lang.ref.WeakReference;//用来观察系统里短消息的数据库变化  ”表“内容观察者,只要信息数据库发生变化，都会触发该ContentObserver 派生类  public class SMSContentObserver extends ContentObserver {    private static String TAG = "SMSContentObserver";    private WeakReference<Context> mContext;    private Handler mHandler;   //更新UI线程    public SMSContentObserver(Context context, Handler handler) {        super(handler);        mContext = new WeakReference<Context>(context);        mHandler = handler;    }    /**     * 当所监听的Uri发生改变时，就会回调此方法     *     * @param selfChange 此值意义不大 一般情况下该回调值false     */    @Override    public void onChange(boolean selfChange) {        //查询收件箱里的内容        Uri outSMSUri = Uri.parse("content://sms/inbox");        Cursor c = mContext.get().getContentResolver().query(outSMSUri, null, null, null,"date desc");        if (c != null && c.moveToFirst()) {            try{                Log.e(TAG, "the number of send is" + c.getString(c.getColumnIndex("address")) + "  " + c.getString(c.getColumnIndex("body")));                StringBuilder sb = new StringBuilder();                sb.append(c.getString(c.getColumnIndex("body")));                mHandler.obtainMessage(SMSManager.MSG_OUTBOXCONTENT, sb.toString()).sendToTarget();            }catch (CursorIndexOutOfBoundsException ex){                ex.printStackTrace();            }finally {                c.close();            }        }    }}  

然后，我们需要一个接口回调去把拦截消息显示出去，需要一个开关去接受消息和关闭消息

public class SMSManager {    private SMSContentObserver smsContentObserver;    public static int MSG_OUTBOXCONTENT = 2;    public static String ACTION = "android.provider.Telephony.SMS_RECEIVED";    private static volatile SMSManager _instance = null;    private IntentFilter intentFilter;    private boolean startFlag = false;    private  MessageListener mMessageListener;    //回调接口    public interface MessageListener {        public void onReceived(String message);    }    private Handler mHandler = new Handler() {        public void handleMessage(Message msg) {            String outbox = (String) msg.obj;            mMessageListener.onReceived(outbox);        }    };    private SMSManager(){    }    public static SMSManager getInstance() {        if (_instance == null) {            synchronized (SMSManager.class) {                if (_instance == null) {                    _instance = new SMSManager();                }            }        }        return _instance;    }    /**     * 开始接收     *     * @param context     */    public void startReceiveSMS(Context context,MessageListener listener) {        smsContentObserver = new SMSContentObserver(context, mHandler);        mMessageListener = listener;        Uri smsUri = Uri.parse("content://sms");        context.getContentResolver().registerContentObserver(smsUri, true,smsContentObserver );    }    /**     * 停止接收     *     * @param context     */    public void stopReceiveSMS(Context context) {      if(smsContentObserver!=null) {            context.getContentResolver().unregisterContentObserver(smsContentObserver);            smsContentObserver=null;        }    }

页面的调用

    SMSManager.getInstance().startReceiveSMS(getApplicationContext(), new SMSManager.MessageListener() {        @Override        public void onReceived(String message) {            String code = BQUtils.patternCode(message);            etCode.setText(code);        }    });}