自由手記

if(file.getPath().endsWith(".apk")){
        String filePath = file.getPath();
        PackageInfo packageInfo = context.getPackageManager().getPackageArchiveInfo(filePath,PackageManager.GET_ACTIVITIES);
        if(packageInfo !=null){
            ApplicationInfo appInfo = packageInfo.applicationInfo;
            if(Build.VERSION.SDK_INT >=8){
                appInfo.sourceDir = filePath;
                appInfo.publicSourceDir = filePath;
            }
            Drawable icon = appInfo.loadIcon(context.getPackageManager());
            bmpIcon =((BitmapDrawable) icon).getBitmap();
        }
    }

The most important line is appInfo.publicSourceDir = filePath;

This is a bug. See http://code.google.com/p/android/issues/detail?id=9151

The null check packageInfo != null is there in case the .apk is not parsed correctly.

FROM:

http://stackoverflow.com/questions/5674683/how-to-show-icon-of-apk-in-my-file-manager