RecyclerView添加header

[{"title":"（ 101 个子文件 3.4MB ） RecyclerView添加header","children":[{"title":"proguard-rules.pro <span style='color:#111;'> 674B </span>","children":null,"spread":false},{"title":"recyclerviewheader.iml <span style='color:#111;'> 7.35KB </span>","children":null,"spread":false},{"title":"ApplicationTest.java <span style='color:#111;'> 372B </span>","children":null,"spread":false},{"title":"menu_main.xml <span style='color:#111;'> 314B </span>","children":null,"spread":false},{"title":"ic_launcher.png <span style='color:#111;'> 3.34KB </span>","children":null,"spread":false},{"title":"......","children":null,"spread":false},{"title":"<span style='color:steelblue;'>文件过多，未全部展示</span>","children":null,"spread":false}],"spread":true}]