Android6.0 源码修改之屏蔽系统短信功能和来电功能

一、屏蔽系统短信功能

1、屏蔽所有短信

android 4.2 短信发送流程分析可参考这篇 戳这

源码位置 vendor\mediatek\proprietary\packages\apps\Mms\src\com\android\mms\transaction\SmsReceiverService.java

private void handleSmsReceived(Intent intent, int error) {
    //2018-10-09 cczheng  add for intercept mms notifications  start
    if (true) {
        Log.i("SmsReceived", "handleSmsReceived");
        return;
    }
    //2018-10-09 cczheng add for intercept mms notifications  end

    SmsMessage[] msgs = Intents.getMessagesFromIntent(intent);
    /// M:Code analyze 022, check null @{
    if (msgs == null) {
        MmsLog.e(MmsApp.TXN_TAG, "getMessagesFromIntent return null.");
        return;
    }
    MmsLog.d(MmsApp.TXN_TAG, "handleSmsReceived SmsReceiverService");
    /// 
    ......
}

在handleSmsReceived（）方法中直接return即可，不去解析和分发短信消息，同时这样操作 短信将不会记录到短信数据库中,插入短信消息到数据库的方法见下文insertMessage（)方法。

2、屏蔽特定的短信(特定的短信号码或者短信内容)

源码位置同上

• SmsMessage.getOriginatingAddress() 获取短信号码

• SmsMessage.getMessageBody() 获取短信内容

    private void handleSmsReceived(Intent intent, int error) {
        SmsMessage[] msgs = Intents.getMessagesFromIntent(intent);
        .....
  
        /// M:Code analyze 024, print log @{
        SmsMessage tmpsms = msgs[0];
        MmsLog.d(MmsApp.TXN_TAG, "handleSmsReceived" + (tmpsms.isReplace() ? "(replace)" : "")
            + " messageUri: " + messageUri
            + ", address: " + tmpsms.getOriginatingAddress()
            + ", body: " + tmpsms.getMessageBody());
        /// @
  
        //2018-10-09 cczheng add for intercept mms notifications  start
        if ("10010".equals(tmpsms.getOriginatingAddress()) || "话费".contains(tmpsms.getMessageBody())) {
            Log.i("SmsReceived", "handleSmsReceived");
            return;
        }
        //2018-10-09 cczheng  add for intercept mms notifications  end
  
        ....
    }

是否插入短信消息到数据库,insertMessage（)方法在handleSmsReceived()中调用

private Uri insertMessage(Context context, SmsMessage[] msgs, int error, String format) {
    // Build the helper classes to parse the messages.
    if (msgs == null) {
        MmsLog.e(MmsApp.TXN_TAG, "insertMessage:getMessagesFromIntent return null.");
        return null;
    }
    /// @}
    SmsMessage sms = msgs[0];

    if (sms.getMessageClass() == SmsMessage.MessageClass.CLASS_0) {
        MmsLog.d(MmsApp.TXN_TAG, "insertMessage: display class 0 message!");
        displayClassZeroMessage(context, msgs, format);
        return null;
    } else if (sms.isReplace()) {
        MmsLog.d(MmsApp.TXN_TAG, "insertMessage: is replace message!");
        return replaceMessage(context, msgs, error);
    } else {
        MmsLog.d(MmsApp.TXN_TAG, "insertMessage: stored directly!");
        return storeMessage(context, msgs, error);
    }
}

3、应用层拦截短信(不用修改android源码，原理就是用你的app去替代系统默认的短信app，过程略繁琐)

需要添加SmsReceiver，MmsReceiver，ComposeSmsActivity，HeadlessSmsSendService这几个类，并在AndroidManifest中进行相应配置，具体流程可参考这篇 戳这

二、屏蔽系统来电响铃和通知提示

屏蔽系统来电可分为三个步骤

1.来电静音，不响铃

2.来电挂断，不出现IncallActivity

3、拦截未接来电通知，不显示在状态栏StatusBar中

ps：此种修改方式的弊端在于来电时网络数据会离线2s左右

好，现在我们开始按这三个步骤来修改源码

1.来电静音，不响铃

源码位置 packages/services/Telecomm/src/com/android/server/telecom/Ringer.java

private void updateRinging(Call call) {
    if (mRingingCalls.isEmpty()) {
        stopRinging(call, "No more ringing calls found");
        stopCallWaiting(call);
    } else {
        //2018-10-10 cczheng add  anotation function startRingingOrCallWaiting() for silent call start
        Log.d("callRinging", "silent call, will not play ringtone");
        // startRingingOrCallWaiting(call);
        //2018-10-10 cczheng add  anotation function startRingingOrCallWaiting() for silent call end
    }
}

是的，注释掉startRingingOrCallWaiting(call);方法就ok啦

2.来电挂断，不出现IncallActivity

思路：监听PhoneState，当监听到响铃时，直接通过反射调用endcall方法挂断电话。监听PhoneStateListener可以写到广播中，当收到开机广播时，开始监听phoneState，这样和系统保持同步。以下是参考代码

public class PhoneStartReceiver extends BroadcastReceiver {

    private static final String TAG = "PhoneStartReceiver";
    private PhoneCallListener mPhoneCallListener;
    private TelephonyManager mTelephonyManager;

    @Override
    public void onReceive(final Context context, final Intent intent) {
        String action = intent.getAction();

        if (action.equals(Intent.ACTION_BOOT_COMPLETED)) {
            // endCall when CALL_STATE_RINGING
            initPhoneCallListener(context);
        } 
    }

    private void initPhoneCallListener(Context context){
        mPhoneCallListener = new PhoneCallListener();
        mTelephonyManager = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);
        mTelephonyManager.listen(mPhoneCallListener, PhoneCallListener.LISTEN_CALL_STATE);
    }

    public class PhoneCallListener extends PhoneStateListener {
        @Override
        public void onCallStateChanged(int state, String incomingNumber) {
            Log.v(TAG, "onCallStateChanged-state: " + state);
            Log.v(TAG, "onCallStateChanged-incomingNumber: " + incomingNumber);
            switch (state)  {
                case TelephonyManager.CALL_STATE_RINGING:
                     endCall();
                    break;
                default:
                    break;
            }
            super.onCallStateChanged(state, incomingNumber);
        }
    }


    private void endCall() {
        try {
            Method m1 = mTelephonyManager.getClass().getDeclaredMethod("getITelephony");
            if (m1 != null) {
                m1.setAccessible(true);
                Object iTelephony = m1.invoke(mTelephonyManager);

                if (iTelephony != null) {
                    Method m2 = iTelephony.getClass().getDeclaredMethod("silenceRinger");
                    if (m2 != null) {
                        m2.invoke(iTelephony);
                        Log.v(TAG, "silenceRinger......");
                    }
                    Method m3 = iTelephony.getClass().getDeclaredMethod("endCall");
                    if (m3 != null) {
                        m3.invoke(iTelephony);
                        Log.v(TAG, "endCall......");
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            Log.e(TAG, "endCallError", e);
        }
    }

}

3.拦截未接来电通知，不显示在状态栏StatusBarr中

源码位置 packages/apps/InCallUI/src/com/android/incallui/StatusBarNotifier.java

private void updateInCallNotification(final InCallState state, CallList callList) {
   ...

    final Call call = getCallToShow(callList);
    
    //2018-10-10 cczheng add intercept incoming notification start
    if (true) {
        if (call != null) {
            Log.v("InCallNotification", "phoneNumber = " + call.getNumber());
        }
      return;
    }
    //2018-10-10 cczheng add  intercept incoming notification end

    if (call != null) {
        showNotification(call);
    } else {
        cancelNotification();
    }

  ...
}

其实核心方法就是showNotification(call)，发送通知当statusBar收到通知就处理并显示在状态栏。

当你发现这样处理完后，重新mm，然后push替换Dialer.apk重启后，你会坑爹的发现状态栏那个未接来电图标依旧显示，无fa可说，继续跟踪日志揪出罪魁祸首，最终发现另一处奇葩的地方。

源码位置 packages/services/Telecomm/src/com/android/server/telecom/ui/MissedCallNotifierImpl.java

诺，就是这了，看注释就明白了吧 Create a system notification for the missed call

/**
 * Create a system notification for the missed call.
 *
 * @param call The missed call.
 */
@Override
public void showMissedCallNotification(Call call) {
    ////2018-10-10 cczheng hide missed call notification [S]
    if (true) {
        android.util.Log.i("misscall", "showMissedCallNotification......");
        return;
    }
    ///2018-10-10 cczheng hide missed call notification [E]
    mMissedCallCount++;

    final int titleResId;
    final String expandedText;  // The text in the notification's line 1 and 2.
    ....
}

ok，这样我们就搞定了来电功能。

三、隐藏短信应用和电话应用在launcher中显示(去除AndroidManifest中的category)

四、总结

Android源码修改没有大家想象的那么难，毕竟Google工程师都已经给我们标注了详细的注释说明，只是框架和封装的思路难以理解，这就考验我们的耐心了，Log是个好东西，多加日志，多分析，这样很容易上手。

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