安卓通话状态监控

<span style="font-size:14px;">case STOP_RING:
                            if (DBG) log("mRingHandler: STOP_RING...");
                            r = (Ringtone) msg.obj;
                            if (r != null) {
                                r.stop();
                            } else {
                                if (DBG) log("- STOP_RING with null ringtone!  msg = " + msg);
                            }
                            getLooper().quit();
                            break;</span>

这边是当对方接听前挂电话或者对方没有能力接电话后，本机的提示音会随之变化，关键在与这个stop——ring这个消息的来源是

<span style="font-size:14px;">  public void handleMessage(Message msg) {
                    Ringtone r = null;
                    switch (msg.what) {
                        case PLAY_RING_ONCE:</span>

关键的问题在与找到这个message是在哪里被发的，看起来所有的message在发送的时候都会带上特定的handle。

 void stopRing() {
        synchronized (this) {
            if (DBG) log("stopRing()...");

            try {
                mPowerManager.setAttentionLight(false, 0x00000000);
            } catch (RemoteException ex) {
                // the other end of this binder call is in the system process.
            }

            if (mRingHandler != null) {
                mRingHandler.removeCallbacksAndMessages(null);
                Message msg = mRingHandler.obtainMessage(STOP_RING);
                msg.obj = mRingtone;
              <span style="color:#66FF99;"> <span style="color:#FF6666;"> mRingHandler.sendMessage(msg);</span></span>
                PhoneUtils.setAudioMode();
                mRingThread = null;
                mRingHandler = null;
                mRingtone = null;
                mFirstRingEventTime = -1;
                mFirstRingStartTime = -1;
            } else {
                if (DBG) log("- stopRing: null mRingHandler!");
            }

            if (mVibratorThread != null) {
                if (DBG) log("- stopRing: cleaning up vibrator thread...");
                mContinueVibrating = false;
                mVibratorThread = null;
            }
            // Also immediately cancel any vibration in progress.
            mVibrator.cancel();
        }
    }

看msg

  public void handleMessage(Message msg) {
        switch(msg.what) {
            case CallStateMonitor.PHONE_NEW_RINGING_CONNECTION:
                Log.i(TAG, "[CORE][MODELER] PHONE_NEW_RINGING_CONNECTION");
                // We let the CallNotifier handle the new ringing connection first. When the custom
                // ringtone and send_to_voicemail settings are retrieved, CallNotifier will directly
                // call CallModeler's onNewRingingConnection.
                break;
            case CallStateMonitor.PHONE_DISCONNECT:
                Log.i(TAG, "[CORE][MODELER] PHONE_DISCONNECT");
                onDisconnect((Connection) ((AsyncResult) msg.obj).result);
                break;
            case CallStateMonitor.PHONE_UNKNOWN_CONNECTION_APPEARED:
                // fall through
            case CallStateMonitor.PHONE_STATE_CHANGED:
                Log.i(TAG, "[CORE][MODELER] PHONE_STATE_CHANGED/PHONE_UNKNOWN_CONNECTION_APPEARED");
                onPhoneStateChanged((AsyncResult) msg.obj);
                break;
            case CallStateMonitor.PHONE_ON_DIAL_CHARS:
                Log.i(TAG, "[CORE][MODELER] PHONE_ON_DIAL_CHARS");
                onPostDialChars((AsyncResult) msg.obj, (char) msg.arg1);
                break;
            case CallStateMonitor.PHONE_SUPP_SERVICE_NOTIFY:
                Log.i(TAG, "[CORE][MODELER] PHONE_SUPP_SERVICE_NOTIFY");

                if (msg.obj != null && ((AsyncResult) msg.obj).result != null) {
                    mSuppSvcNotification =
                            (SuppServiceNotification) (((AsyncResult) msg.obj).result);
                    if (mSuppSvcNotification.code == SuppServiceNotification.MT_CODE_CALL_ON_HOLD
                            || mSuppSvcNotification.code
                            == SuppServiceNotification.MT_CODE_CALL_RETRIEVED) {
                        onPhoneStateChanged(null);
                    }
                }
                break;
            case CallStateMonitor.PHONE_ACTIVE_SUBSCRIPTION_CHANGE:
                Log.i(TAG, "[CORE][MODELER] PHONE_ACTIVE_SUBSCRIPTION_CHANGE");
                onActiveSubChanged((AsyncResult) msg.obj);
                break;
            default:
                break;
        }
    }

关于

public void onCreate() {
        super.onCreate();
        mCM = CallManager.getInstance();
        if (TelephonyConstants.IS_DSDS) {
            mCM1 = CallManager.getInstance();
            mCM2 = CallManager.getInstance2();
        }

 mCM.getDefaultPhone().registerForServiceStateChanged(mHandler,
                                                             SERVICE_STATE_CHANGED, null);
        mCM.registerForPreciseCallStateChanged(mHandler,
                                               PRECISE_CALL_STATE_CHANGED, null);