个人代码收集：持续整理中

1.获取应用软件版本

private PackageManager pm ;
 
     /**
     * 获取应用软件版本
     * @return
     */
    private String  getAppVersion(){
        pm = getPackageManager();
        try {
            PackageInfo pinfo  = pm.getPackageInfo("com.math.client", 0);
            String version = pinfo.versionName;
            return version;
        } catch (NameNotFoundException e) {
            e.printStackTrace();
            // can't reach
            return "";
        }
    }

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