本流程圖基於MTK平臺 Android 7.0，普通來電，本流程只作爲溝通學習使用

前面介紹了一下來電界面的一些信息，接下來我們繼續分析，看看通話界面中的 CallButtonFragment 的功能和作用。

整體界面

上圖紅框中的部分就是本次講解的界面 CallButtonFragment ，這裏目前只考慮普通語音（voice）電話，我們可以看到其中包含了audio、mute、dialpad、hold、add_call、record等幾個按鈕，下面我們就會分別對它們的功能流程做介紹。

Audio

整體流程圖

這裏主要介紹了 audio 相關的流程，這裏其實還是有點兒繞的，因爲這裏涉及到了多個狀態，包括：通過藍牙傳遞聲音，通過有線耳機傳遞聲音，通過揚聲器傳遞聲音，通過聽筒傳遞聲音等，在這個流程中，CallAudioRouteStateMachine 這個類很重要，因爲這些狀態的區分以及各自的邏輯都寫在這個類裏面，讀者可以認真去看看這個類收穫應該會很多。
我們這裏就只畫了從聽筒變爲揚聲器的過程，最終會調用到 AudioManager 中去，audio相關的具體實現我這邊沒有具體詳跟，有興趣的同學可以自己再追下去看看。

部分細節方法

//CallAudioRouteStateMachine.ActiveSpeakerRoute.enter 設置一些狀態
        public void enter() {
            Log.i("michael","ActiveSpeakerRoute enter");
            super.enter();
            mWasOnSpeaker = true;
            setSpeakerphoneOn(true); //打開speaker
            setBluetoothOn(false); 
            CallAudioState newState = new CallAudioState(mIsMuted, ROUTE_SPEAKER,
                    mAvailableRoutes);
            setSystemAudioState(newState);
            updateInternalCallAudioState();
        }

Mute

整體流程圖

整體流程比較簡單，通過上層一直調用到 AudioService 然後通過 JNI 的方法調用底層的具體實現。

部分細節方法

//CallAudioRouteStateMachine.setSystemAudioState 改變 statusbar 的圖標和audio的狀態
    private void setSystemAudioState(CallAudioState newCallAudioState) {
        ///M: ALPS02797725 @{
        // show mute and speaker icon in status bar
        mStatusBarNotifier.notifyMute(newCallAudioState.isMuted());
        mStatusBarNotifier.notifySpeakerphone(newCallAudioState.getRoute() ==
            CallAudioState.ROUTE_SPEAKER);
        /// @}
        setSystemAudioState(newCallAudioState, false);
    }
//CallAudioRouteStateMachine.updateInternalCallAudioState 改變audio的狀態供外部使用
    /**
     * Updates the CallAudioState object from current internal state. The result is used for
     * external communication only.
     */
    private void updateInternalCallAudioState() {
        IState currentState = getCurrentState();
        if (currentState == null) {
            Log.e(this, new IllegalStateException(), "Current state should never be null" +
                    " when updateInternalCallAudioState is called.");
            mCurrentCallAudioState = new CallAudioState(
                    mIsMuted, mCurrentCallAudioState.getRoute(), mAvailableRoutes);
            return;
        }
        int currentRoute = mStateNameToRouteCode.get(currentState.getName());
        mCurrentCallAudioState = new CallAudioState(mIsMuted, currentRoute, mAvailableRoutes);
    }

Dialpad

整體流程圖

這個流程主要是顯示 dialpadfragment 界面的過程，比較簡單，但是裏面涉及到的一些動畫還是比較有趣的。

部分細節方法

//DialpadView.animateShow 創建動畫
    public void animateShow() {
        // This is a hack; without this, the setTranslationY is delayed in being applied, and the
        // numbers appear at their original position (0) momentarily before animating.
        final AnimatorListenerAdapter showListener = new AnimatorListenerAdapter() {};

        for (int i = 0; i < mButtonIds.length; i++) {
            int delay = (int)(getKeyButtonAnimationDelay(mButtonIds[i]) * DELAY_MULTIPLIER);
            int duration =
                    (int)(getKeyButtonAnimationDuration(mButtonIds[i]) * DURATION_MULTIPLIER);
            final DialpadKeyButton dialpadKey = (DialpadKeyButton) findViewById(mButtonIds[i]);

            ViewPropertyAnimator animator = dialpadKey.animate();
            if (mIsLandscape) {
                // Landscape orientation requires translation along the X axis.
                // For RTL locales, ensure we translate negative on the X axis.
                dialpadKey.setTranslationX((mIsRtl ? -1 : 1) * mTranslateDistance);
                animator.translationX(0);
            } else {
                // Portrait orientation requires translation along the Y axis.
                dialpadKey.setTranslationY(mTranslateDistance);
                animator.translationY(0);
            }
            animator.setInterpolator(AnimUtils.EASE_OUT_EASE_IN)
                    .setStartDelay(delay)
                    .setDuration(duration)
                    .setListener(showListener)
                    .start();
        }
    }
//CallCardFragment.updateFabPosition 更新hangupbutton的大小和位置
    private void updateFabPosition() {
        /**
         * M: skip update Fab position with animation when FAB is not visible and size is 0X0,
         * hwui will throw exception when draw view size is 0 and hardware layertype. @{
         */
....省略部分代碼
        mFloatingActionButtonController.align(
                FloatingActionButtonController.ALIGN_MIDDLE /* align base */,
                0 /* offsetX */,
                offsetY,
                true);
        mFloatingActionButtonController.resize(
                mIsDialpadShowing ? mFabSmallDiameter : mFabNormalDiameter, true);
    }
//ProximitySensor.updateProximitySensorMode  更新P-sensor的狀態
 ....省略部分代碼 
            /// M: disable Proximity Sensor during VT Call
            if (mIsPhoneOffhook && !screenOnImmediately && !isVideoCall) {
                Log.d(this, "Turning on proximity sensor");
                // Phone is in use!  Arrange for the screen to turn off
                // automatically when the sensor detects a close object.

                /// M: for ALPS01275578 @{
                // when reject a incoming call, the call state is INCALL, but we should NOT
                // acquire wake lock in this case
                if (!shouldSkipAcquireProximityLock()) {
                    turnOnProximitySensor();
                }

            } else {
                Log.d(this, "Turning off proximity sensor");
                // Phone is either idle, or ringing.  We don't want any special proximity sensor
                // behavior in either case.

                /// M: For ALPS01769498 @{
                // Screen on immediately for incoming call, this give user a chance to notice
                // the new incoming call when speaking on an existed call.
                if (InCallPresenter.getInstance().getPotentialStateFromCallList(callList)
                        == InCallState.INCOMING) {
                    Log.d(this, "Screen on immediately for incoming call");
                    screenOnImmediately = true;
                }
                /// @}
                turnOffProximitySensor(screenOnImmediately);
            }
....省略部分代碼

Hold

整體流程圖

這個流程比較簡單，從上層一層層的調用到 RILJ 然後執行hold操作。

部分細節方法

//CallsManager.holdCall 這裏有個細節，如果存在兩路通話，一個hold一個activity，並且是屬於兩個不同的phoneaccount，那麼hold 其中一個，另外一個就會unhold

    public void holdCall(Call call) {
        if (!mCalls.contains(call)) {
            Log.d(this, "Unknown call (%s) asked to be put on hold", call);
        } else {
            Log.d(this, "Putting call on hold: (%s)", call);
            call.hold();
        }
        /// M: When have active call and hold call in different account, hold operation will
        // swap the two call.
        Call heldCall = getHeldCall();
        Log.i("michael"," call ="+call.getTargetPhoneAccount()+" "+" heldCall ="+heldCall.getTargetPhoneAccount());
        if (heldCall != null &&
                !Objects.equals(call.getTargetPhoneAccount(), heldCall.getTargetPhoneAccount())) {
            Log.i("michael"," into heldCall");
            heldCall.unhold();
        }
        /// @}
    }

//TelephonyConnection.performHold 如果存在一個call waiting 的來電，那麼就不執行hold操作，讓用戶可以去接聽來電
    public void performHold() {
        Log.v(this, "performHold");
        // TODO: Can dialing calls be put on hold as well since they take up the
        // foreground call slot?
        if (Call.State.ACTIVE == mConnectionState) {
            Log.v(this, "Holding active call");
            try {
                Phone phone = mOriginalConnection.getCall().getPhone();
                Call ringingCall = phone.getRingingCall();

                // Although the method says switchHoldingAndActive, it eventually calls a RIL method
                // called switchWaitingOrHoldingAndActive. What this means is that if we try to put
                // a call on hold while a call-waiting call exists, it'll end up accepting the
                // call-waiting call, which is bad if that was not the user's intention. We are
                // cheating here and simply skipping it because we know any attempt to hold a call
                // while a call-waiting call is happening is likely a request from Telecom prior to
                // accepting the call-waiting call.
                // TODO: Investigate a better solution. It would be great here if we
                // could "fake" hold by silencing the audio and microphone streams for this call
                // instead of actually putting it on hold.
                if (ringingCall.getState() != Call.State.WAITING) {
                    phone.switchHoldingAndActive();
                }
  ....省略部分代碼

Add_call 和 Record

整體流程圖

Add_call

流程圖中紅色方框部分就是 addcall 按鈕的執行過程，我們可以看到其實邏輯很簡單，就是再次打開 dialer 應用讓用戶啓動第二路通話MO流程

部分細節方法

//TelecomAdapter.addCall 具體實現啓動dialer的過程
    void addCall() {
        if (mInCallService != null) {
            Intent intent = new Intent(Intent.ACTION_DIAL);//ACTION_DIAL = "android.intent.action.DIAL"
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

            // when we request the dialer come up, we also want to inform
            // it that we're going through the "add call" option from the
            // InCallScreen / PhoneUtils.
            intent.putExtra(ADD_CALL_MODE_KEY, true);
            try {
                Log.d(this, "Sending the add Call intent");
                mInCallService.startActivity(intent);
            } catch (ActivityNotFoundException e) {
                // This is rather rare but possible.
                // Note: this method is used even when the phone is encrypted. At that moment
                // the system may not find any Activity which can accept this Intent.
                Log.e(this, "Activity for adding calls isn't found.", e);
            }
        }
    }

Record

上面流程圖中，除了紅色方框的部分其它都是 record 的流程邏輯，乍一看感覺比較複雜，其實還是很簡單，只是跨越類很多，最終通過 MediaRecorder 類以 JNI 的形式調用底層 C/C++ 的具體實現代碼，這裏還畫出了，當 record 的狀態發生了變化通過一層層的 listener，最終通知fragment 顯示 record 的紅色錄製圖標，以及將button的text內容從“Start recording”變成“Stop recording”的過程。

部分細節方法

//StorageManagerEx.getDefaultPath 拿到默認存儲錄音的路徑
    /**
     * Returns default path for writing.
     * @hide
     * @internal
     */
    public static String getDefaultPath() {
        String path = "";
        boolean deviceTablet = false;
        boolean supportMultiUsers = false;

        try {
            path = SystemProperties.get(PROP_SD_DEFAULT_PATH);
            //Log.i(TAG, "get path from system property, path=" + path);
        } catch (IllegalArgumentException e) {
            Log.e(TAG, "IllegalArgumentException when get default path:" + e);
        }

        // Property will be empty when first boot, should set to default
        // For OTA upgrade, path is invalid, need update default path
        if (path.equals("")
                || path.equals(STORAGE_PATH_SD1_ICS) || path.equals(STORAGE_PATH_SD1)
                || path.equals(STORAGE_PATH_SD2_ICS) || path.equals(STORAGE_PATH_SD2)) {
            //Log.i(TAG, "DefaultPath invalid! " + "path = " + path + ", set to default.");
            try {
                IMountService mountService =
                  IMountService.Stub.asInterface(ServiceManager.getService("mount"));
                if (mountService == null) {
                    Log.e(TAG, "mount service is not initialized!");
                    return "";
                }
                int userId = UserHandle.myUserId();
                VolumeInfo[] volumeInfos = mountService.getVolumes(0);
                for (int i = 0; i < volumeInfos.length; ++i) {
                    VolumeInfo vol = volumeInfos[i];
                    if (vol.isVisibleForWrite(userId) && vol.isPrimary()) {
                        path = vol.getPathForUser(userId).getAbsolutePath();
                        //Log.i(TAG, "Find primary and visible volumeInfo, "
                        //+ "path=" + path + ", volumeInfo:" + vol);
                        break;
                    }
                }
                setDefaultPath(path);
...省略部分代碼
        return path;
    }

//Recorder.startRecording 創建文件，開始錄音，並往裏面寫入數據
    public void startRecording(int outputfileformat, String extension) throws IOException {
        log("startRecording");

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd_HH.mm.ss");
        String prefix = dateFormat.format(new Date());
        File sampleDir = new File(StorageManagerEx.getDefaultPath());
....省略部分代碼
            mRecorder.prepare();
            mRecorder.start();
            mSampleStart = System.currentTimeMillis();
            setState(RECORDING_STATE);
....省略部分代碼
    }

//CallCardFragment.updateVoiceRecordIcon  顯示或者隱藏錄音的紅色圖標，並帶有一閃一閃的動畫
    public void updateVoiceRecordIcon(boolean show) {
        mVoiceRecorderIcon.setVisibility(show ? View.VISIBLE : View.INVISIBLE);
        AnimationDrawable ad = (AnimationDrawable) mVoiceRecorderIcon.getDrawable();
        if (ad != null) {
            if (show && !ad.isRunning()) {
                ad.start();
            } else if (!show && ad.isRunning()) {
                ad.stop();
            }
        }
        /// M:[RCS] plugin API @{
        ExtensionManager.getRCSeCallCardExt().updateVoiceRecordIcon(show);
        /// @}
    }
//CallButtonFragment.configRecordingButton 更新button 和 button 的text 內容
    /**
     * M: configure recording button.
     */
    @Override
    public void configRecordingButton() {
        boolean isRecording = InCallPresenter.getInstance().isRecording();
        //update for tablet and CT require.
        mRecordVoiceButton.setSelected(isRecording);

        mRecordVoiceButton
                .setContentDescription(getString(isRecording ? R.string.stop_record
                        : R.string.start_record));

        if (mOverflowPopup == null) {
            return;
        }
        String recordTitle = isRecording ? getString(R.string.stop_record)
                : getString(R.string.start_record);
        updatePopMenuItemTitle(BUTTON_SWITCH_VOICE_RECORD, recordTitle);//更新button的text 內容

    }

Android N 通話界面_CallButtonFragment

相關類圖

整體界面

Audio

整體流程圖

部分細節方法

Mute

整體流程圖

部分細節方法

Dialpad

整體流程圖

部分細節方法

Hold

整體流程圖

部分細節方法

Add_call 和 Record

整體流程圖

Add_call

部分細節方法

Record

部分細節方法

java-StringBuffer的操作及其用法範例

java String常用方法

StringBuffer類

Android N 來電流程（MT）

android N 撥打電話流程（MO）

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