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android用存到缓存的方法来保存ListView里的数据
对于这样的数据:
<?xml version="1.0" encoding="utf-8" ?> <rss><sid>77f265bb46de068e78f35afbadec62af</sid><count>3</count><control>0</control> <mblog><uid>1195224593</uid><favid>3436952795</favid><mblogid>5xtaJR</mblogid><mblogidnum>3436952795</mblogidnum><mblogtype>0</mblogtype><mlevel>0</mlevel><feedid>5xtaJR</feedid><nick>马艳丽</nick><portrait>http://tp2.sinaimg.cn/1195224593/50/5614100014/0</portrait><vip>1</vip><vipsubtype>0</vipsubtype><member_type>13</member_type><remark></remark><level>2</level><rtnum>11</rtnum><commentnum>25</commentnum><attitudenum>0</attitudenum><attitudeid>0</attitudeid><attitudes_status>0</attitudes_status><attitudes_count>0</attitudes_count><mblogtypename></mblogtypename><visible><type>0</type><list_id>0</list_id></visible><content>婚礼在北海美丽的北海公园举行…好美好浪漫的地方… </content><pic>http://ss12.sinaimg.cn/wap240/473dae11494344debfc5b</pic><time>1288852274</time><source>彩信</source></mblog></rss>
首先我们把从服务器取到的数据,里面有个主要的对象mblog,我们用一个对象来存储:
public class MBlog implements <strong>Serializable</strong> { //保证这个对象是可以序列化的 private static final long serialVersionUID = -3514924369786543050L; public String uid; public String favid; public String mblogid; public String nick; public String portrait; public boolean vip; public String content; public String rtrootuid; public String rtrootid; public String rtrootnick; public boolean rtrootvip; public String rtreason; public int rtnum; public int commentnum; public Date time; public String pic; public String src; public String longitude;// 经度 public String latitude;// 纬度 public boolean equals(Object o) { if (o == null) return false; if (o == this) return true; Class<?> cla = o.getClass(); if (cla == getClass()) { MBlog other = (MBlog) o; if (other.mblogid.equals(mblogid)) return true; } return false; } public int hashCode() { return mblogid.hashCode() * 101 >> 12; } }
在Activity取到缓存的Path: mCacheDir = this.getCacheDir().getPath();
一般是/data/data/com.example.weibotest/cache
这个是save方法:
public static void save(Object obj, String path) { try { File f = new File(path); /*if(f != null){ f.mkdirs(); f.createNewFile(); }*/ FileOutputStream fos = new FileOutputStream(f); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(obj); oos.flush(); oos.close(); } catch (IOException e) { } }
读取方法:
public static Object load(String path) { Object obj = null; File file = new File(path); try { /*if(file != null){ file.mkdirs(); }*/ if (file.exists()) { FileInputStream fis = new FileInputStream(file); ObjectInputStream ois = new ObjectInputStream(fis); try { obj = ois.readObject(); } catch (ClassNotFoundException e) { } ois.close(); } }catch (IOException e) { } return obj; }
这样来调用:
public void parseAssertData() { InputStream is = null; try { is = this.getAssets().open("11.xml", Context.MODE_PRIVATE); int length = is.available(); byte[] buffer = new byte[length]; is.read(buffer); String temp = new String(buffer); try { Object[] array = ParseData.getMBlogList(temp); List<MBlog> list = (List<MBlog>)array[1]; FileUtils.save(list, mCacheDir+'/'+"001_fav"); List<MBlog> list1 = (List<MBlog>)FileUtils.load(mCacheDir+'/'+"001_fav"); MBlog blog = list1.get(1); System.out.println("===size="+blog.src); } catch (Exception e) { e.printStackTrace(); } } catch (IOException ex) { ex.printStackTrace(); } }
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