原文地址:https://blog.csdn.net/bit_kaki/article/details/76984503

这里使用geodatebase文件来初始化离线地图：
https://www.jianshu.com/p/514eb67ac1ca

图例显示

思路:图例是地图展示里常用的辅助展示工具。曾经我采用过将图例截成图片转为2进制保存到数据库里，然后在加载图层时候调取对应图片作为图例展示。但是后来知道geodatabase数据其实就是个空间数据库，如果是通过geodatabase数据加载图层，图斑都是geodatabase数据里的空间数据Geometry根据样式Symbol进行动态渲染，所以这个Symbol如果能提取出来，也就是我们要的图例了。

if (layer instanceof FeatureLayer) {
    FeatureLayer featureLayer = (FeatureLayer) layer;
    GeodatabaseFeatureTable geoTable = (GeodatabaseFeatureTable) featureLayer.getFeatureTable();

    String typeFileid = geoTable.getTypeIdField();
    if (typeFileid.equalsIgnoreCase("")) {//TypeIdField没有值
    //获取图层中的FeatureTemplate
    List<FeatureTemplate> templates = geoTable.getFeatureTemplates();

    LayerLegendInfo titleLegend = new LayerLegendInfo();
    titleLegend.setName(featureLayer.getName());
    titleLegend.setType(LayerLegendInfo.Type.TITLE);
    legendInfoList.add(titleLegend);
    //从templates构造出图例
    for (FeatureTemplate template : templates) {
    try {
        //根据FeatureTemplate生成GdbFeature
        //GeodatabaseFeature feature = geoTable.createFeatureWithTemplate(template, null);
        //Renderer renderer = featureLayer.getRenderer();
        ////获取符号
        //Symbol symbol = renderer.getSymbol(feature);
        Symbol symbol = featureLayer.createPopupInfo().createSymbolFromTemplate(template);
        //得到代表图例的图片
        Bitmap bitmap = createBitmapFromSymbol(symbol, layer);
        String name = template.getName();
        LayerLegendInfo legend = new LayerLegendInfo();
        legend.setName(name);
        legend.setType(LayerLegendInfo.Type.ITEM);
        legend.setBitmap(bitmap);
        legendInfoList.add(legend);
        //设置图例的布局和点击事件
        // populateTemplateView(layerTemplate,bitmap,template,symbol,(FeatureLayer)layer);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

 } else {//TypeIdField有值
    List<FeatureType> featureTypes = geoTable.getFeatureTypes();

    LayerLegendInfo titleLegend = new LayerLegendInfo();
    titleLegend.setName(featureLayer.getName());
    titleLegend.setType(LayerLegendInfo.Type.TITLE);
    legendInfoList.add(titleLegend);

    for (FeatureType featureType : featureTypes) {
        FeatureTemplate[] templates = featureType.getTemplates();
        for (FeatureTemplate template : templates) {
            try {
                //根据FeatureTemplate生成GeodatabaseFeature
                //GeodatabaseFeature feature = geoTable.createFeatureWithTemplate(template, null);
                //Renderer renderer = ((FeatureLayer) layer).getRenderer();
                ////获取符号
                //Symbol symbol = renderer.getSymbol(feature);
                Symbol symbol = featureLayer.createPopupInfo().createSymbolFromTemplate(template);
                //得到代表图例的图片
                Bitmap bitmap = createBitmapFromSymbol(symbol, layer);
                String name = template.getName();
                LayerLegendInfo legend = new LayerLegendInfo();
                legend.setName(name);
                legend.setBitmap(bitmap);
                legend.setType(LayerLegendInfo.Type.ITEM);
                legendInfoList.add(legend);
                //设置图例的布局和点击事件
                //populateTemplateView(layerTemplate,bitmap,template,symbol,(FeatureLayer)layer);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

图例显示效果图：

图例显示效果.png