ArcGIS for Android 100.2.1怎么加载移动地图包mmpk文件的所有图层

mmpk文件打包应该没问题，单独作为底图时可以添加成功。

private void loadMapPackage2() { 

 private void loadMapPackage() {

        mMobileMapPackage = new MobileMapPackage(mmpkFilePath);

        mMobileMapPackage.loadAsync();

        mMobileMapPackage.addDoneLoadingListener(new Runnable() {

            @Override

            public void run() {

                LoadStatus mainLoadStatus = mMobileMapPackage.getLoadStatus();

                if (mainLoadStatus == LoadStatus.LOADED) {

                    List<ArcGISMap> mArcGISMapList = mMobileMapPackage.getMaps();

                    ArcGISMap mainArcGISMapMMPK = mArcGISMapList.get(0);

                    LayerList mainMMPKLL = mainArcGISMapMMPK.getOperationalLayers();

                    int valueCount = mainMMPKLL.size();

                    for(int i = 0 ; i<valueCount; i++ ) {

                        FeatureLayer mainFeatureLayer = (FeatureLayer) mainMMPKLL.get(i); 

                        LayerList mLayerList = mainArcGISMap.getOperationalLayers();

                        mLayerList.add(mainFeatureLayer);

                    }

                }

            }

        });

    }

mainMMPKLL里面有13个图层，

断点到mLayerList.add(mainFeatureLayer);这里总是崩掉

请问是什么原因？该怎么添加多图层的mmpk呢？跟geodatabase文件不大一样啊