Android SDCard操作-2

/**
     * 判断该应用在手机中的安装情况
     * @param PackageManager pm  ,String packageName int ,versionCode
     * @param packageName  要判断应用的包名
     * @param versionCode     要判断应用的版本号
     */
    private int doType(PackageManager pm, String packageName, int versionCode)
    {
        List<PackageInfo> pakageinfos = pm.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);
        for (PackageInfo pi : pakageinfos)
        {
            String pi_packageName = pi.packageName;
            int pi_versionCode = pi.versionCode;
            //如果这个包名在系统已经安装过的应用中存在
            if (packageName.endsWith(pi_packageName))
            {
                //Log.i("test","此应用安装过了");
                if (versionCode == pi_versionCode)
                {
                    CommonUtil.log(packageName+"已经安装，不用更新，可以卸载该应用");
                    return INSTALLED;
                }
                else if (versionCode > pi_versionCode)
                {
                    CommonUtil.log(packageName+"已经安装，有更新");
                    return INSTALLED_UPDATE;
                }
            }
        }
        CommonUtil.log("未安装该应用，可以安装");
        return UNINSTALLED;
    }
   
    public static Intent openFile(String filePath)
    {
       
        File file = new File(filePath);
        if (!file.exists())
            return null;
        /* 取得扩展名 */
        String end = file.getName()
                .substring(file.getName().lastIndexOf(".") + 1,
                        file.getName().length())
                .toLowerCase();
        /* 依扩展名的类型决定MimeType */
        if (end.equals("m4a") || end.equals("mp3") || end.equals("mid")
                || end.equals("xmf") || end.equals("ogg") || end.equals("wav"))
        {
            return getAudioFileIntent(filePath);
        }
        else if (end.equals("3gp") || end.equals("mp4"))
        {
            return getAudioFileIntent(filePath);
        }
        else if (end.equals("jpg") || end.equals("gif") || end.equals("png")
                || end.equals("jpeg") || end.equals("bmp"))
        {
            return getImageFileIntent(filePath);
        }
        else if (end.equals("apk"))
        {
            return getApkFileIntent(filePath);
        }
        else if (end.equals("ppt"))
        {
            return getPptFileIntent(filePath);
        }
        else if (end.equals("xls"))
        {
            return getExcelFileIntent(filePath);
        }
        else if (end.equals("doc"))
        {
            return getWordFileIntent(filePath);
        }
        else if (end.equals("pdf"))
        {
            return getPdfFileIntent(filePath);
        }
        else if (end.equals("chm"))
        {
            return getChmFileIntent(filePath);
        }
        else if (end.equals("txt"))
        {
            return getTextFileIntent(filePath, false);
        }
        else
        {
            return getAllIntent(filePath);
        }
    }
   
    //Android获取一个用于打开APK文件的intent
    public static Intent getAllIntent(String param)
    {
       
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setAction(android.content.Intent.ACTION_VIEW);
        Uri uri = Uri.fromFile(new File(param));
        intent.setDataAndType(uri, "*/*");
        return intent;
    }