Android - Load PDF/PDF Viewer

Android - Load PDF / PDF Viewer

Finally, i got a solution, actually i made a trick to load a pdf file using Google Docs inside a webview:

webview.loadUrl("http://docs.google.com/gview?embedded=true&url=http://myurl.com/demo.pdf");

Show PDF file in App

Android provides PDF API now with which it is easy to present pdf content inside application.

you can find details here

Below is the sample snippet to render from a pdf file in assets folder.

    private void openRenderer(Context context) throws IOException {
    // In this sample, we read a PDF from the assets directory.
    File file = new File(context.getCacheDir(), FILENAME);
    if (!file.exists()) {
        // Since PdfRenderer cannot handle the compressed asset file directly, we copy it into
        // the cache directory.
        InputStream asset = context.getAssets().open(FILENAME);
        FileOutputStream output = new FileOutputStream(file);
        final byte[] buffer = new byte[1024];
        int size;
        while ((size = asset.read(buffer)) != -1) {
            output.write(buffer, 0, size);
        }
        asset.close();
        output.close();
    }
    mFileDescriptor = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
    // This is the PdfRenderer we use to render the PDF.
    if (mFileDescriptor != null) {
        mPdfRenderer = new PdfRenderer(mFileDescriptor);
    }
}

update: This snippet is from google developers provided samples.

Android open pdf file

The problem is that there is no app installed to handle opening the PDF. You should use the Intent Chooser, like so:

File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath() +"/"+ filename);
Intent target = new Intent(Intent.ACTION_VIEW);
target.setDataAndType(Uri.fromFile(file),"application/pdf");
target.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);

Intent intent = Intent.createChooser(target, "Open File");
try {
    startActivity(intent);
} catch (ActivityNotFoundException e) {
    // Instruct the user to install a PDF reader here, or something
}   

How to show a pdf file from storage using AndroidPdfViewer library?

I have tested your code and it works just fine on Android 10 device. Your are missing something from the below:

1.In Android Manifest File add the READ_EXTERNAL_STORAGE permission

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

and inside application tag add requestLegacyExternalStorage to true to be able to have access on External Storage on Android 10 device and above.

<application
        android:requestLegacyExternalStorage="true"

2.Verify that the pdf exists on the device under "/Download/Pdfs/myfile.pdf" path.

3.Change your activity using the below code by requesting External Storage permission at runtime first in onCreate method:

public class PdfViewActivity2 extends AppCompatActivity {

    private static final int READ_STORAGE_PERMISSION_REQUEST_CODE = 1000;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //check if Read External Storage permission was granded
        boolean granded = checkPermissionForReadExtertalStorage();
        if(!granded){
            requestPermissionForReadExtertalStorage();
        }
        else {
           readPdf();
        }
    }

    public boolean checkPermissionForReadExtertalStorage() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            int result = checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE);
            return result == PackageManager.PERMISSION_GRANTED;
        }
        return false;
    }

    public void requestPermissionForReadExtertalStorage() {
        try {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, READ_STORAGE_PERMISSION_REQUEST_CODE);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case READ_STORAGE_PERMISSION_REQUEST_CODE: {
                // If request is cancelled, the result arrays are empty.
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // permission was granted. Read Pdf from External Storage
                    readPdf();
                } else {
                    // permission denied. Disable the functionality that depends on this permission.
                }
            }
        }
    }

    private void readPdf(){
        File path = new File(Environment.getExternalStorageDirectory().getPath() + "/Download/Pdfs/myfile.pdf");
        PDFView pdfView = findViewById(R.id.pdfView);
        pdfView.fromFile(path).load();
    }
}

Display PDF file inside my android application

Maybe you can integrate MuPdf in your application. Here is I've described how to do this: Integrate MuPDF Reader in an app

android: open a pdf from my app using the built in pdf viewer

AFAIK, Adobe has not documented any public Intents it wants developers to use.

You can try an ACTION_VIEW Intent with a Uri pointing to the file (either on the SD card or MODE_WORLD_READABLE in your app-local file store) and a MIME type of "application/pdf".

Android - Load PDF file without downloading or using google docs?

I've seen good results in some apps I've worked on, using AndroidPdfViewer. It adds some MB to your final APK, but trust me it's worth it. It can render just about any pdf file and has great performance. You'll have to download the PDF to the device, but you can delete it afterwards.

It's currently the best way, and most compatible with older android versions, of loading pdf files without leaving the app.

You can read here about the pros and cons of all the currently available solutions, and how AndroidPdfViewer is king among them :D

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