sendmessage Service的工作过程使用Android O(8.0) A(10)

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这段代码最为关键int res = ActivityManager.getService().bindService(

mMainThread.getApplicationThread(), getActivityToken(), service,

service.resolveTypeIfNeeded(getContentResolver()),

sd, flags, getOpPackageName(), user.getIdentifier());

  public int bindService(IApplicationThread caller, IBinder token, Intent service,
            String resolvedType, IServiceConnection connection, int flags, String callingPackage,
            int userId) throws TransactionTooLargeException {
        enforceNotIsolatedCaller("bindService");

        // Refuse possible leaked file descriptors
        if (service != null && service.hasFileDescriptors() == true) {
            throw new IllegalArgumentException("File descriptors passed in Intent");
        }

        if (callingPackage == null) {
            throw new IllegalArgumentException("callingPackage cannot be null");
        }

        synchronized(this) {
            return mServices.bindServiceLocked(caller, token, service,
                    resolvedType, connection, flags, callingPackage, userId);
        }
    }

接下来会调用ActiveServices的bindServiceLocked

    int bindServiceLocked(IApplicationThread caller, IBinder token, Intent service,
            String resolvedType, final IServiceConnection connection, int flags,
            String callingPackage, final int userId) throws TransactionTooLargeException {

                                    try {
                                        bringUpServiceLocked(serviceRecord,
                                                serviceIntent.getFlags(),
                                                callerFg, false, false);

        return 1;
    }

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