android通过apk包得到apk包信息

　　　　//安装包路径
        String weicharFilePath="sdcard/weichar.apk";
        PackageManager pm = getPackageManager();
        PackageInfo info = pm.getPackageArchiveInfo(weicharFilePath, PackageManager.GET_ACTIVITIES);
        if(info != null){
            ApplicationInfo appInfo = info.applicationInfo;
            String appName = pm.getApplicationLabel(appInfo).toString();
          //得到安装包名称
            String packageName = appInfo.packageName;
          //得到版本信息
            String version=info.versionName;
            //得到图标信息
            Drawable icon = pm.getApplicationIcon(appInfo);
        }