String filePath = "/sdcard/feijiedemo.apk";  
    PackageManager packageManager = getPackageManager();  
    PackageInfo packageInfo = packageManager.getPackageArchiveInfo(filePath, PackageManager.GET_ACTIVITIES);  
    Log.d("name", packageInfo.packageName);  
    Log.d("uid", packageInfo.sharedUserId);  
    Log.d("vname", packageInfo.versionName);  
    Log.d("code", packageInfo.versionCode+"");  

android-获得".apk"文件的相关信息。包名、版本号等等