android p IntentService有关stopSelf

IntentService stopSelf 为什么要所有的事务处理完成之后才能stop service

在IntentService　中　处理完onHandleIntent会调用stopSelf

    private final class ServiceHandler extends Handler {        public ServiceHandler(Looper looper) {            super(looper);        }        @Override        public void handleMessage(Message msg) {            onHandleIntent((Intent)msg.obj);            stopSelf(msg.arg1);        }    }

    /**     * Old version of {@link #stopSelfResult} that doesn't return a result.     *       * @see #stopSelfResult     */    public final void stopSelf(int startId) {        if (mActivityManager == null) {            return;        }        try {        //调用ＡＭＳ　stopService            mActivityManager.stopServiceToken(                    new ComponentName(this, mClassName), mToken, startId);        } catch (RemoteException ex) {        }    }

    @Override    public boolean stopServiceToken(ComponentName className, IBinder token,            int startId) {        synchronized(this) {            return mServices.stopServiceTokenLocked(className, token, startId);        }    }

  boolean stopServiceTokenLocked(ComponentName className, IBinder token,            int startId) {        if (DEBUG_SERVICE) Slog.v(TAG_SERVICE, "stopServiceToken: " + className                + " " + token + " startId=" + startId);        ServiceRecord r = findServiceLocked(className, token, UserHandle.getCallingUserId());        if (r != null) {            if (startId >= 0) {                // Asked to only stop if done with all work.  Note that                // to avoid leaks, we will take this as dropping all                // start items up to and including this one.                ServiceRecord.StartItem si = r.findDeliveredStart(startId, false, false);                if (si != null) {                    while (r.deliveredStarts.size() > 0) {                        ServiceRecord.StartItem cur = r.deliveredStarts.remove(0);                        cur.removeUriPermissionsLocked();                        if (cur == si) {                            break;                        }                    }                }                if (r.getLastStartId() != startId) {//这里如果ｓｔａｒｔｉｄ不知最新的就不ｓｔｏｐ                    return false;                }                if (r.deliveredStarts.size() > 0) {                    Slog.w(TAG, "stopServiceToken startId " + startId                            + " is last, but have " + r.deliveredStarts.size()                            + " remaining args");                }            }            synchronized (r.stats.getBatteryStats()) {                r.stats.stopRunningLocked();            }            r.startRequested = false;            if (r.tracker != null) {                r.tracker.setStarted(false, mAm.mProcessStats.getMemFactorLocked(),                        SystemClock.uptimeMillis());            }            r.callStart = false;            final long origId = Binder.clearCallingIdentity();            bringDownServiceIfNeededLocked(r, false, false);            Binder.restoreCallingIdentity(origId);            return true;        }        return false;    }

首先ｓｅｒｖｉｃｅ在启动的时候，　会从ＡＭＳ中传startId 的参数

    @Override    public int onStartCommand(@Nullable Intent intent, int flags, int startId) {        onStart(intent, startId);        return mRedelivery ? START_REDELIVER_INTENT : START_NOT_STICKY;    }

如果一个每次在startService是会调用ActiveService.java 中的
realStartServiceLocked接口，

        // If the service is in the started state, and there are no        // pending arguments, then fake up one so its onStartCommand() will        // be called.        if (r.startRequested && r.callStart && r.pendingStarts.size() == 0) {            r.pendingStarts.add(new ServiceRecord.StartItem(r, false, r.makeNextStartId(),                    null, null, 0));        }

ServiceRecord.java

    public int makeNextStartId() {        lastStartId++;        if (lastStartId < 1) {            lastStartId = 1;        }        return lastStartId;    }

IntentService stopSelf 为什么要所有的事务处理完成之后才能stop service

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