重写CursorLoader导致的问题

在重写CursorLoader的时候，我执行了对Uri的监听，但是发现当其改变时候并没有执行onloadfininshed的方法，经查阅源码得知

loadinbackground方法里面数据改变却没有新的的对象产生的时候不会触发callOnLoadFinished，从而不会触发onLoadFinished！

源码如下LoaderManager.java

  public void onLoadComplete(Loader<Object> loader, Object data) {
            if (DEBUG) Log.v(TAG, "onLoadComplete: " + this);
            
            if (mDestroyed) {
                if (DEBUG) Log.v(TAG, "  Ignoring load complete -- destroyed");
                return;
            }


            if (mLoaders.get(mId) != this) {
                // This data is not coming from the current active loader.
                // We don't care about it.
                if (DEBUG) Log.v(TAG, "  Ignoring load complete -- not active");
                return;
            }
            
            LoaderInfo pending = mPendingLoader;
            if (pending != null) {
                // There is a new request pending and we were just
                // waiting for the old one to complete before starting
                // it.  So now it is time, switch over to the new loader.
                if (DEBUG) Log.v(TAG, "  Switching to pending loader: " + pending);
                mPendingLoader = null;
                mLoaders.put(mId, null);
                destroy();
                installLoader(pending);
                return;
            }
            
            // Notify of the new data so the app can switch out the old data before
            // we try to destroy it.
            if (mData != data || !mHaveData) {
                mData = data;
                mHaveData = true;
                if (mStarted) {
                    callOnLoadFinished(loader, data);
                }
            }


            //if (DEBUG) Log.v(TAG, "  onLoadFinished returned: " + this);


            // We have now given the application the new loader with its
            // loaded data, so it should have stopped using the previous
            // loader.  If there is a previous loader on the inactive list,
            // clean it up.
            LoaderInfo info = mInactiveLoaders.get(mId);
            if (info != null && info != this) {
                info.mDeliveredData = false;
                info.destroy();
                mInactiveLoaders.remove(mId);
            }


            if (mActivity != null && !hasRunningLoaders()) {
                mActivity.mFragments.startPendingDeferredFragments();
            }
        }


        void callOnLoadFinished(Loader<Object> loader, Object data) {
            if (mCallbacks != null) {
                String lastBecause = null;
                if (mActivity != null) {
                    lastBecause = mActivity.mFragments.mNoTransactionsBecause;
                    mActivity.mFragments.mNoTransactionsBecause = "onLoadFinished";
                }
                try {
                    if (DEBUG) Log.v(TAG, "  onLoadFinished in " + loader + ": "
                            + loader.dataToString(data));
                    mCallbacks.onLoadFinished(loader, data);
                } finally {
                    if (mActivity != null) {
                        mActivity.mFragments.mNoTransactionsBecause = lastBecause;
                    }
                }
                mDeliveredData = true;
            }
        }