1. 写入缓存：建立文件夹，把list集合里面的数组转换为JSON数组，存入文件夹 2. 读取缓存：把JSON数组从文件夹里面读取出来，然后放入list集合，返回list集合 private final static File filefolder=new File("/sdcard/myData"); private final static File filename=new File("/sdcard/myData/tem.txt"); public static boolean writeCache(List list) { if(!filefolder.exists()) filefolder.mkdirs(); try { JSONArray array=new JSONArray(); for(int i=0;i readCache() throws JSONException,IOException { if(!filefolder.exists()) filefolder.mkdir(); List list=new ArrayList(); if(filename.exists()) { FileInputStream in=new FileInputStream(filename); String line=null; StringBuffer sb=new StringBuffer(""); BufferedReader br=new BufferedReader(new InputStreamReader(in)); while((line=br.readLine())!=null) sb.append(line); br.close(); in.close(); JSONArray array=new JSONArray(sb.toString()); for(int i=0;i