update升级包版本信息的读取

android设备在用U盘升级的时候，要先判断U盘中的升级包是否匹配此机型，是否高于当前版本。如果这些都成立的话，那么才刷机。这里我列出一个读取U盘版本信息的例子，只要运用了ZipInputStream  ZipEntry 。 

  public String getUdiskVersion() {

 Log.e(TAG, "--> getUdiskVersion()");
 String zipFile = "mnt/udisk/usb/USB_DISK0/udisk0/update.zip";
 File f = new File(zipFile) ;
 if(!f.exists()){
     return "" ;
 }
 FileInputStream fis = null;
 try {
     fis = new FileInputStream(f);
 } catch (FileNotFoundException e1) {
     // TODO Auto-generated catch block
     e1.printStackTrace();
 }
 BufferedReader reader = null;
 String str = "";
 String version = "";
 ZipEntry ze = null;
 ZipInputStream zis = null;

 try {
     zis = new ZipInputStream(fis);
     while ((ze = zis.getNextEntry()) != null) {
         if (ze.getName().equals("system/build.prop")) {
             Log.e(TAG, "找到了" + "路径是：" + ze.getName());
             break;
         }
     }

     reader = new BufferedReader(new InputStreamReader(zis, "GBK"));
     while ((str = reader.readLine()) != null) {
         if (str.startsWith("ro.product.model")) {
             version = str.substring(str.indexOf('=') + 1);
             Toast.makeText(this, version, 0);
             Log.e(TAG, "--> str = " + str);
         }
     }
 } catch (IOException e) {
     e.printStackTrace();
 } finally {
     try {
         reader.close();
         ze.clone();
         zis.close();
         fis.close();
     } catch (IOException e) {
         e.printStackTrace();
     }
 }
 return version;

转载自：http://www.verydemo.com/demo_c89_i41744.html