sendmessage Service的工作过程使用Android O(8.0) A(2)

具体实现是在ActivityManagerService

  ComponentName startServiceInPackage(int uid, Intent service, String resolvedType,
            boolean fgRequired, String callingPackage, int userId)
            throws TransactionTooLargeException {
        synchronized(this) {
            if (DEBUG_SERVICE) Slog.v(TAG_SERVICE,
                    "startServiceInPackage: " + service + " type=" + resolvedType);
            final long origId = Binder.clearCallingIdentity();
            ComponentName res;
            try {
                res = mServices.startServiceLocked(null, service,
                        resolvedType, -1, uid, fgRequired, callingPackage, userId);
            } finally {
                Binder.restoreCallingIdentity(origId);
            }
            return res;
        }
    }

在上述代码中AMS会mServices.startServiceLocked来调用，其中mServices为ActiveServices类型，来进行Service的管理，包括启动、绑定和停止等。

   ComponentName startServiceLocked(IApplicationThread caller, Intent service, String resolvedType,
            int callingPid, int callingUid, boolean fgRequired, String callingPackage, final int userId)
            throws TransactionTooLargeException {
     ...
        ComponentName cmp = startServiceInnerLocked(smap, service, r, callerFg, addToStarting);
        return cmp;
    }

在最后会调用startServiceInnerLocked方法

  ComponentName startServiceInnerLocked(ServiceMap smap, Intent service, ServiceRecord r,
            boolean callerFg, boolean addToStarting) throws TransactionTooLargeException {
        ServiceState stracker = r.getTracker();
        if (stracker != null) {
            stracker.setStarted(true, mAm.mProcessStats.getMemFactorLocked(), r.lastActivity);
        }
        r.callStart = false;
        synchronized (r.stats.getBatteryStats()) {
            r.stats.startRunnined();
        }
        String error = bringUpServiceLocked(r, service.getFlags(), callerFg, false, false);
        if (error != null) {
            return new ComponentName("!!", error);
        }
    ...
        return r.name;
    }

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