android CallCard.java/updateState(Phone phone)分析

CallCard.java----->void updateState(Phone phone)----->根据当点电话的状态选择执行下列更新函数，1,updateRingCall(phone)/ 2,updateForegroundCall(phone)/ 3, updateNoCallphone()

    1,
        updateRingCall(phone)----->a, displayMainCallStatus(phone, ringingCall)  && b, displayOnholdingCallStatus(phone, bgCall) &&  c, displayOngoingCallStatus(phone, fgoingCall)
        a, displayMainCallStatus(phone ringingCall)----->｛假如无来电，返回， 确定是否横屏状态,蓝牙状态， 如果当前电话已经接通，根据横屏状态和蓝牙状态拿到当前CallCard背景图片资>源，即callCardBackgroundResid, 更新时钟信息，就是打电话的时候屏幕下方计时的时钟， 而如果是保持状态，挂断状态（DISCONNECTED），拨打等待（DIALING）状态,警告状态（ALERTING）,来电状态(INCOMING)，等待状态（WAITING）,也拿到对应的callCardBackgroundResid, 取消计时，空闲状态下，什么也不做 ｝， 设置好callCardBackgroundResid(就是装头像的那个背景)后，然后进入updat
eCallCardTitleWidgets(Phone phone, Call call), 设置一些widget, getTitleForCallCard(call), 给当前状态找一个条题目，比如“正在拨号”“来电”“当前通话”等等， ｛如果当前是的Call是激活的也就是接通的，根据蓝牙状态给当前通话找一个图标，设置文字颜色，如果是挂断状态，也配置好图标和字串显示在屏幕上，然后根据挂断与否，显示时钟｝，到这里为止，显示的都是背景阿，文字什>么的， 当前通话人的信息，比如头像名字还没找出来，接写来就干这个了， 如果当前是会议通话，更新会议界面，否则查找个人信息，如相片，电话号码，名字等，显示在界面上不详细解释.
        b,c 不详细解释
    2，
        updateForgroundCall(phone), 如果当前电话空闲，且有新连接，则displayMainCallStatus(), 然后执行1里面的动作
    3，
        updateNoCallPhone, 也是执行，1里面的三个更新函数，只不过，不同状态下，参数不一样，比如电话在完全空闲状态下，没有新来电，也没有挂起的电话，也没有去电，则参数，ringCall, bgCall, ongoingCall 都为null.

 

源代码如下：

void updateState(Phone phone) {
        if (DBG) log("updateState(" + phone + ")...");

        // Update some internal state based on the current state of the phone.
        // TODO: This code, and updateForegroundCall() / updateRingingCall(),
        // can probably still be simplified some more.

        Phone.State state = phone.getState();  // IDLE, RINGING, or OFFHOOK
        if (state == Phone.State.RINGING) {
            // A phone call is ringing *or* call waiting
            // (ie. another call may also be active as well.)
            updateRingingCall(phone);
        } else if (state == Phone.State.OFFHOOK) {
            // The phone is off hook. At least one call exists that is
            // dialing, active, or holding, and no calls are ringing or waiting.
            updateForegroundCall(phone);
        } else {
            // The phone state is IDLE!
            //
            // The most common reason for this is if a call just
            // ended: the phone will be idle, but we *will* still
            // have a call in the DISCONNECTED state:
            Call fgCall = phone.getForegroundCall();
            Call bgCall = phone.getBackgroundCall();
            if ((fgCall.getState() == Call.State.DISCONNECTED)
                || (bgCall.getState() == Call.State.DISCONNECTED)) {
                // In this case, we want the main CallCard to display
                // the "Call ended" state.  The normal "foreground call"
                // code path handles that.
                updateForegroundCall(phone);
            } else {
                updateNoCall(phone);
            }
        }
    }