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Android Telephony分析(一) ---- Phone详解

目录:

  Phone的继承关系与PhoneFactory(GsmCdmaPhone、ImsPhone、SipPhone)

  Phone进程的启动

  Phone对象的初始化(DefaultPhoneNotifier和RIL对象,将作为创建GsmCdmaPhone参数

  为Phone实例注册监听事件(CM,注册与注销)

  Phone有什么作用(监听、上报消息、modem交互)

1、在Android N中,Phone的继承关系:

Android中有三种PhoneFactory:
PhoneFactory.java ——–>用于创建GsmCdmaPhone对象;
ImsPhoneFactory.java ——–>用于创建ImsPhone对象;
SipPhoneFactory.java ——–>用于创建SipPhone对象。
其中,GsmCdmaPhone对象是在Phone进程启动之后创建的(步骤1~6);之后,等到ImsService启动之后,就会创建ImsPhone(步骤7~11)。

 2.1 Phone进程的启动


在Android中进程名一般对应的是该APP的包名,所以我们可以在源码中找package=”com.android.phone”。
接着你就会在/packages/services/Telephony/AndroidManifest.xml文件中看到:

<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:androidprv
="http://schemas.android.com/apk/prv/res/android"
package
="com.android.phone"
coreApp
="true"
android:sharedUserId
="android.uid.phone"
android:sharedUserLabel
="@string/phoneAppLabel" >

 

<application android:name="PhoneApp" 
//在系统启动之时,ActivityManagerService的systemReady() 会加载所有persistent为true的应用
android:persistent
="true"
android:label
="@string/phoneAppLabel"
android:icon
="@mipmap/ic_launcher_phone"
android:allowBackup
="false"
android:supportsRtl
="true"
android:usesCleartextTraffic
="true">

2.2 Phone对象的初始化

在PhoneFactory.java的makeDefaultPhone方法中(时序图中的步骤3)

 

    public static void makeDefaultPhone(Context context) {
        ......
        //创建DefaultPhoneNotifier对象 sPhoneNotifier = new DefaultPhoneNotifier();

        //根据待机模式计算出要创建Phone对象的数量
        int numPhones = TelephonyManager.getDefault().getPhoneCount();
        //创建networkMode、PhoneProxy、RIL的数组,用于存储对应的对象
        int[] networkModes = new int[numPhones];
        //Android 6.0
        //sProxyPhones = new PhoneProxy[numPhones];
      //Android N中没有了PhoneProxy,所以通过getDefaultPhone()得到的就是Phone实例
        sPhones = new Phone[numPhones];
        sCommandsInterfaces = new RIL[numPhones];

        for (int i = 0; i < numPhones; i++) {
            // reads the system properties and makes commandsinterface
            // Get preferred network type.
            networkModes[i] = RILConstants.PREFERRED_NETWORK_MODE;
            Rlog.i(LOG_TAG, "Network Mode set to " + Integer.toString(networkModes[i]));
            //创建RIL,此时的i对应的是PhoneID。
            sCommandsInterfaces[i] = new RIL(context, networkModes[i],
                            cdmaSubscription, i);
        }
        ......
        for (int i = 0; i < numPhones; i++) {
              Phone phone = null;
              //根据不用的类型,创建不同的Phone对象
              int phoneType = TelephonyManager.getPhoneType(networkModes[i]);
              if (phoneType == PhoneConstants.PHONE_TYPE_GSM) {
                  phone = new GsmCdmaPhone(context,
                          sCommandsInterfaces[i], sPhoneNotifier, i,
                          PhoneConstants.PHONE_TYPE_GSM,
                     //Android N中新增TelephonyComponentFactory类,主要用来
                   //初始化CallTracker、ServiceStateTracker、DcTracker等对象
                          TelephonyComponentFactory.getInstance());
             } else if (phoneType == PhoneConstants.PHONE_TYPE_CDMA) {
                  phone = new GsmCdmaPhone(context,
                          sCommandsInterfaces[i], sPhoneNotifier, i,
                          PhoneConstants.PHONE_TYPE_CDMA_LTE,
                          TelephonyComponentFactory.getInstance());
             }
             Rlog.i(LOG_TAG, "Creating Phone with type = " + phoneType + " sub = " + i);

            sPhones[i] = phone;
        } 
        .....
        // Start monitoring after defaults have been made.
        // Default phone must be ready before ImsPhone is created
        // because ImsService might need it when it is being opened.
        for (int i = 0; i < numPhones; i++) {
            //开始监听ImsService,如果ImsService已启动,进而执行创建ImsPhone对象
            sPhones[i].startMonitoringImsService();
        }
    }

2.3 为Phone实例注册监听事件

PhoneGlobals.java的onCreate()方法中

 

    public void onCreate() {
        if (mCM == null) {
            // Initialize the telephony framework
            //先创建Phone实例
            PhoneFactory.makeDefaultPhones(this);
            mCM = CallManager.getInstance();
            for (Phone phone : PhoneFactory.getPhones()) {
                //把新创建的Phone实例传递进来
                mCM.registerPhone(phone);
            }
        }
    }

由CallManager来管理这些Phone实例并且为它们注册监听事件。

 

    // list of registered phones, which are PhoneBase objs
    private final ArrayList<Phone> mPhones;

    public boolean registerPhone(Phone phone) {
        Phone basePhone = getPhoneBase(phone);

        if (basePhone != null && !mPhones.contains(basePhone)) {

            if (DBG) {
                Rlog.d(LOG_TAG, "registerPhone(" +
                        phone.getPhoneName() + " " + phone + ")");
            }
            if (mPhones.isEmpty()) {
                mDefaultPhone = basePhone;
            }
            //管理Phone实例
            mPhones.add(basePhone);
            mRingingCalls.add(basePhone.getRingingCall());
            mBackgroundCalls.add(basePhone.getBackgroundCall());
            mForegroundCalls.add(basePhone.getForegroundCall());
            //为Phone实例注册监听事件
            registerForPhoneStates(basePhone);
            return true;
        }
        return false;
    }
    private void registerForPhoneStates(Phone phone) {
        ......
        phone.registerForDisconnect(handler, EVENT_DISCONNECT,mRegistrantidentifier);
        phone.registerForIncomingRing(handler, EVENT_INCOMING_RING,mRegistrantidentifier);
        ......
    }

 

3. Phone有什么作用


回忆第2小节创建GsmCdmaPhone对象时

      sPhoneNotifier = new DefaultPhoneNotifier();
      sCommandsInterfaces[i] = new RIL(context, networkModes[i],
                            cdmaSubscription, i);

      phone = new GsmCdmaPhone(context,
              sCommandsInterfaces[i], sPhoneNotifier, i,
              PhoneConstants.PHONE_TYPE_GSM,
              TelephonyComponentFactory.getInstance());

初始化了DefaultPhoneNotifier和RIL对象,将它们作为参数,再创建GsmCdmaPhone。
所以在GsmCdmaPhone中可以直接操纵这两个对象的方法。
DefaultPhoneNotifier实现了PhoneNotifier接口,PhoneNotifier接口中定义了很多notifyXXX的接口,所以DefaultPhoneNotifier主要的作用就是上报消息

 

public interface PhoneNotifier {

    public void notifyPhoneState(Phone sender);
    public void notifyServiceState(Phone sender);
    ...
}

而RIL对象主要作用是跟modem交互。
因此,Phone实例就间接地拥有了跟modem交互的能力和上报消息的能力,再加上Phone实例自身就有监听事件的能力,所以Phone的作用就是:
1.注册监听事件,及时上报消息(Call状态变化、Service状态变化、新来电等等)
2.间接地为其他类提供跟modem交互的服务。

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版权声明:本文为CSDN博主「linyongan」的原创文章,遵循undefined版权协议,转载请附上原文出处链接及本声明。
原文链接:https://blog.csdn.net/linyongan/article/details/51994817

 

posted on 2019-12-10 15:53  思否学否  阅读(3847)  评论(0编辑  收藏  举报