InCallUI初步解析（一）

InCallUI负责显示来电界面，通话界面等信息，InCallUI主要显示界面是InCallActivity，有多个Fragment是附着在InCallActivity上。这些Fragment分别是CallCardFragment、CallButtonFragment、DialpadFragment、AnswerFragment、ConferenceManagerFragment、VideoCallFragment。
CallCardFragment：用于显示联系人信息及通话时间等；
CallButtonFragment：通话界面下方的控制按钮。
DialpadFragment：拨号盘显示控件。
AnswerFragment：来电控制控件，用于操作接听/拒接/短信快捷回复。
ConferenceManagerFragment：会议电话的界面。
VideoCallFragment：视屏通话控件。

我们可以先看一下InCallActivity的布局：

在InCallActivity中有着控制显示与隐藏Fragment的方法，如下所示：

private void showFragment(String tag, boolean show, boolean executeImmediately) {
        Trace.beginSection("showFragment - " + tag);
        final FragmentManager fm = getFragmentManagerForTag(tag);

        if (fm == null) {
            Log.w(TAG, "Fragment manager is null for : " + tag);
            return;
        }

        Fragment fragment = fm.findFragmentByTag(tag);
        if (!show && fragment == null) {
            // Nothing to show, so bail early.
            return;
        }

        final FragmentTransaction transaction = fm.beginTransaction();
        if (show) {
            if (fragment == null) {
                fragment = createNewFragmentForTag(tag);
                transaction.add(getContainerIdForFragment(tag), fragment, tag);
            } else {
                transaction.show(fragment);
            }
        } else {
            transaction.hide(fragment);
        }

        transaction.commitAllowingStateLoss();
        if (executeImmediately) {
            fm.executePendingTransactions();
        }
        Trace.endSection();
    }

private Fragment createNewFragmentForTag(String tag) {
        if (TAG_DIALPAD_FRAGMENT.equals(tag)) {
            mDialpadFragment = new DialpadFragment();
            return mDialpadFragment;
        } else if (TAG_ANSWER_FRAGMENT.equals(tag)) {
            mAnswerFragment = new AnswerFragment();
            return mAnswerFragment;
        } else if (TAG_CONFERENCE_FRAGMENT.equals(tag)) {
            mConferenceManagerFragment = new ConferenceManagerFragment();
            return mConferenceManagerFragment;
        } else if (TAG_CALLCARD_FRAGMENT.equals(tag)) {
            mCallCardFragment = new CallCardFragment();
            return mCallCardFragment;
        }
        throw new IllegalStateException("Unexpected fragment: " + tag);
    }

 private FragmentManager getFragmentManagerForTag(String tag) {
        if (TAG_DIALPAD_FRAGMENT.equals(tag)) {
            return mChildFragmentManager;
        } else if (TAG_ANSWER_FRAGMENT.equals(tag)) {
            return mChildFragmentManager;
        } else if (TAG_CONFERENCE_FRAGMENT.equals(tag)) {
            return getFragmentManager();
        } else if (TAG_CALLCARD_FRAGMENT.equals(tag)) {
            return getFragmentManager();
        }
        throw new IllegalStateException("Unexpected fragment: " + tag);
    }

 private int getContainerIdForFragment(String tag) {
        if (TAG_DIALPAD_FRAGMENT.equals(tag)) {
            return R.id.answer_and_dialpad_container;
        } else if (TAG_ANSWER_FRAGMENT.equals(tag)) {
            return R.id.answer_and_dialpad_container;
        } else if (TAG_CONFERENCE_FRAGMENT.equals(tag)) {
            return R.id.main;
        } else if (TAG_CALLCARD_FRAGMENT.equals(tag)) {
            return R.id.main;
        }
        throw new IllegalStateException("Unexpected fragment: " + tag);
    }

从getContainnerIdForFragment方法我们得知CallCardFragment与ConferenceManagerFragment是依附于InCallActivity的布局，至于AnswerFragment与DialpadFragement是依附于CallCardFragment的布局中，我们可以看一下CallCardFragment的布局：

从中可以看到id为answer_and_dialpad_container的布局，也可以看到CallButtonFragment，ConfereneceManagerFragment是依附在CallCardFragment中。

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