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Show PDF in Android

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android

pdf

In my onCreate() I do this check:

//
// check if we have a PDF viewer, else bad things happen
//
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setType("application/pdf");

List<ResolveInfo> intents = getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);

if (intents == null || intents.size() == 0) {
       // display message then...
       finish();
}

On my HTC Desire, this doesn't return a match, even though I have Adobe's PDF viewer. An answer to this question android: open a pdf from my app using the built in pdf viewer mentions that Adobe may not have any public Intents, so the above check will obviously return nothing.

Can anyone verify whether you should be able launch Acrobat from an intent, or is there some other method or PDF viewer to use.

The actual use case is downloading copies of invoices and storing them on local storage using code such as:

 URL url = new URL(data);
 InputStream myInput = url.openConnection().getInputStream();

 FileOutputStream fos = openFileOutput(fname, Context.MODE_WORLD_READABLE);

 // transfer bytes from the input file to the output file
 byte[] buffer = new byte[8192];
 int length;
 while ((length = myInput.read(buffer)) > 0) {
    fos.write(buffer, 0, length);
    progressDialog.setProgress(i++);
 }
 fos.close();

and then to show

// read from disk, and call intent
openFileInput(fname);   // will throw FileNotFoundException

File dir = getFilesDir();       // where files are stored
File file = new File(dir, fname);   // new file with our name

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.fromFile(file));
intent.setType("application/pdf");

startActivity(intent);
like image 359
BJB Avatar asked Sep 14 '10 05:09

BJB


People also ask

Why can't I see PDF files on my phone?

Check the file format and ensure that you have installed an appropriate app to open the file. Download and install such an app from AppGallery or Google Play Store. For example, Microsoft Office or Adobe Acrobat needs to be installed to open PDF files.

How can I view a PDF on my Android without downloading it?

Google Drive Viewer allows files to be viewed (without downloading) in Google Chrome for Android. By default, the file will open in a new tab.

How do I find my default PDF viewer on Android?

Go to Settings. Go to Apps. Select the other PDF app, that always open up automatically. Scroll down to "Launch By Default" or "Open by default".


1 Answers

Connect your phone to you PC, start Eclipse and open the LogCat. Then download a PDF file with the browser and open it. You should see a line such as (I used the HTC desire):

09-14 17:45:58.152: INFO/ActivityManager(79): Starting activity: Intent { act=android.intent.action.VIEW dat=file:///sdcard/download/FILENAME.pdf typ=application/pdf flg=0x4000000 cmp=com.htc.pdfreader/.ActPDFReader }

Have a go with an explicit intent using the component information. Docs say here:

> component -- Specifies an explicit name of a component class to use for the intent. Normally this is determined by looking at the other information in the intent (the action, data/type, and categories) and matching that with a component that can handle it. If this attribute is set then none of the evaluation is performed, and this component is used exactly as is. By specifying this attribute, all of the other Intent attributes become optional.

Downside is you will be bound to the htc reader. But you could try an implicit intent first and if that fails try the explicit intent as a fallback.

like image 86
PaulF Avatar answered Oct 05 '22 23:10

PaulF