File caching (with JSON array) _android

1. Write cache: Create a folder, convert the array in the list to a JSON array, and store it in a folder

2. Read cache: The JSON array is read from the folder, and then put into the list collection, return to the list collection

 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<data> List) {if (!filefolder.exists ()) filefolder.mkdirs ();
      try {jsonarray array=new jsonarray ();
        for (int i=0;i<list.size (); i++) {Data data=list.get (i);
        Jsonobject ob=new jsonobject ();
        Ob.put ("Name", Data.getname ());
        Ob.put ("Reason", Data.getreason ());
      Array.put (OB);
      FileWriter fw=new FileWriter (filename);
      Fw.write (Array.tostring ());
    Fw.close ();
      catch (Exception e) {e.printstacktrace ();
    return false;
  return true; public static list<data> Readcache () throws Jsonexception,ioexception {if (!filefolder.exists ()) fil
    Efolder.mkdir ();
    List<data> list=new arraylist<data> (); 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<array.length (); i++) {jsonobject ob=new jsonobject ();
        Ob=array.getjsonobject (i);
        Data data=new data ();
        Data.setname (ob.getstring ("name"));
        Data.setreason (ob.getstring ("Reason"));
      List.add (data);
  } return list; }

The above is a small series to introduce the file cache (with JSON array), I hope to help you, if you have any questions welcome to my message, small series will promptly reply to everyone!