android基于arcgis开发中，加载shp文件出错

try {
    ShapefileFeatureTable shapefileFeatureTable = new ShapefileFeatureTable(file_ok_filePath); if(featureLayer!=null){ mMapView.removeLayer(featureLayer); } featureLayer = new FeatureLayer(shapefileFeatureTable); Symbol symbol = new SimpleFillSymbol(Color.BLUE); Renderer renderer = new SimpleRenderer(symbol); featureLayer.setRenderer(renderer); mMapView.addLayer(featureLayer); mLog("shp文件加载成功"); } catch (Exception e) {
    mLog("shp文件加载失败：" + e.getMessage()); }