Pdf files as part of Android .apk

问题:

I have to build an Android application which shows a list of pdf files. These pdf files should be secured, in other words - the user of the app should not be able to get a copy of the pdf content by any means (copy/cut/print...etc). My questions now are

1. How should I ship the content of the pdf file along with .apk file.
2. If we send the content of the file in a diff format (raw/byte code), how should I convert the file back to pdf and where should I place the file on the installed machine such that it is secure.

FYI, I will be locking down current version of Adobe Redaer as the pdf viewer to view the pdf files as it doesn't allow copy/paste/print.

This is the first Android app that I am developing. So, I'm a kind of Android newbie. Any help would be greatly appreciated.

Thanks, Navin

回答1:

Probably you should store it in the res/raw folder

回答2:

You can copy this(these) pdf file(s) into assets folder, thus your files will be the part of your application and can not be accessible outside, and you can also treat them as normal files (i.e. open with any pdf viewer in your case). Whenever you want to get access to context file you can call context.getAssets() .

Hope this information helps.

Update : Here is the code I am using to open a file in downloads directory, this code can open the pdf file in any compatible pdf reader if installed on phone, Tested with Adobe Reader. You will need a URI of the pdf file in assets folder to run the code.

String fileName = pdfUrl.substring(pdfUrl.lastIndexOf("/"));

        Log.i("fileName", "" + fileName);
        File file = new File("/sdcard/download" + fileName);
        // File file = new
        // File("/sdcard/download/airtel_latest000.mp3");

        Intent intent;
        if (file.exists()) {

            Uri path = Uri.fromFile(file);

            intent = new Intent(Intent.ACTION_VIEW);

            intent.setDataAndType(path, "application/pdf");

            intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

            downloaded = true;

        } else {

            intent = new Intent(Intent.ACTION_VIEW);

            intent.setData(Uri.parse(pdfUrl));

            downloaded = false;
        }
        try {
            startActivityForResult(intent, 5);

        } catch (ActivityNotFoundException e) {
            Toast.makeText(this, "No Application Available to View PDF",
                    Toast.LENGTH_SHORT).show();
        }