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+"");  
 

記錄一下。說不定以後就用到了。