、从SD卡等路劲获取某安装包（apk文件）的版本信息

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/**

• 获取apk包的信息：版本号，名称，图标等
• @param absPath apk包的绝对路径
• @param context
  /
  public void apkInfo(String absPath,Context context) {
  PackageManager pm = context.getPackageManager();
  PackageInfo pkgInfo = pm.getPackageArchiveInfo(absPath,PackageManager.GET_ACTIVITIES);
  if (pkgInfo != null) {
  ApplicationInfo appInfo = pkgInfo.applicationInfo;
  / 必须加这两句，不然下面icon获取是default icon而不是应用包的icon /
  appInfo.sourceDir = absPath;
  appInfo.publicSourceDir = absPath;
  String appName = pm.getApplicationLabel(appInfo).toString();// 得到应用名
  String packageName = appInfo.packageName; // 得到包名
  String version = pkgInfo.versionName; // 得到版本信息
  / icon1和icon2其实是一样的 */
  Drawable icon1 = pm.getApplicationIcon(appInfo);// 得到图标信息
  Drawable icon2 = appInfo.loadIcon(pm);
  String pkgInfoStr = String.format("PackageName:%s, Vesion: %s, AppName: %s", packageName, version, appName);
  Log.i(TAG, String.format("PkgInfo: %s", pkgInfoStr));
  }
  }