Downloading A Pdf And Displaying It (fileuriexposedexception)

As a preface, I am familiar with coding (2 years in highschool) but am a complete novice when it comes to Android Studio (and Java, in general). I've been searching for solutions f

Solution 1:

If your targetSdkVersion >= 24, then we have to use FileProvider class to give access to the particular file or folder to make them accessible for other apps.

1) First Add a FileProvider tag in AndroidManifest.xml under tag as below:

<?xml version="1.0" encoding="utf-8"?><manifestxmlns:android="http://schemas.android.com/apk/res/android"...
    <application...
        <providerandroid:name=".GenericFileProvider"android:authorities="${applicationId}.my.package.name.provider"android:exported="false"android:grantUriPermissions="true"><meta-dataandroid:name="android.support.FILE_PROVIDER_PATHS"android:resource="@xml/provider_paths"/></provider></application></manifest>

2) Then create a provider_paths.xml file in res/xml folder. Folder may be needed to created if it doesn't exist.

<paths><external-pathname="external_files"path="."/></paths>

3) Now create PdfDownload.java class file and paste below code:

publicclassPdfDownloadextendsActivity {
    TextView tv_loading;
    Context context;

    intdownloadedSize=0, totalsize;
    floatper=0;

    @OverrideprotectedvoidonCreate(Bundle savedInstanceState) {
        isStoragePermissionGranted();
        super.onCreate(savedInstanceState);

        tv_loading = newTextView(this);
        tv_loading.setGravity(Gravity.CENTER);
        tv_loading.setTypeface(null, Typeface.BOLD);
        setContentView(tv_loading);
        downloadAndOpenPDF();
    }


    publicstatic String getLastBitFromUrl(final String url) {
        return url.replaceFirst(".*/([^/?]+).*", "$1");
    }

    voiddownloadAndOpenPDF() {
        finalStringdownload_file_url= getIntent().getStringExtra("url");
        newThread(newRunnable() {
            publicvoidrun() {
                Uripath= Uri.fromFile(downloadFile(download_file_url));
                try {
                    Intentintent=newIntent(Intent.ACTION_VIEW);
                    intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    Uriuri= FileProvider.getUriForFile(PdfDownload.this, BuildConfig.APPLICATION_ID, downloadFile(download_file_url));
                    intent.setDataAndType(uri, "application/pdf");
                    startActivity(intent);
                    finish();


                } catch (ActivityNotFoundException e) {
                    tv_loading
                            .setError("PDF Reader application is not installed in your device");
                }
            }
        }).start();

    }

    File downloadFile(String dwnload_file_path) {
        Filefile=null;
        try {
            URLurl=newURL(dwnload_file_path);
            HttpURLConnectionurlConnection= (HttpURLConnection) url
                    .openConnection();

            urlConnection.connect();

            Stringtest= getLastBitFromUrl(dwnload_file_path);
            Stringdest_file_path= test.replace("%20", "_");
            // set the path where we want to save the fileFileSDCardRoot= Environment.getExternalStorageDirectory();
            // // create a new file, to save the downloaded file
            file = newFile(SDCardRoot, dest_file_path);
            if (file.exists()) {
                return file;
            }
            FileOutputStreamfileOutput=newFileOutputStream(file);

            // Stream used for reading the data from the internetInputStreaminputStream= urlConnection.getInputStream();

            // this is the total size of the file which we are// downloading
            totalsize = urlConnection.getContentLength();
            setText("Starting PDF download...");

            // create a buffer...byte[] buffer = newbyte[1024 * 1024];
            intbufferLength=0;

            while ((bufferLength = inputStream.read(buffer)) > 0) {
                fileOutput.write(buffer, 0, bufferLength);
                downloadedSize += bufferLength;
                per = ((float) downloadedSize / totalsize) * 100;
                if ((totalsize / 1024) <= 1024) {
                    setText("Total PDF File size  : " + (totalsize / 1024)
                            + " KB\n\nDownloading PDF " + (int) per + "% complete");
                } else {
                    setText("Total PDF File size  : " + (totalsize / 1024) / 1024
                            + " MB\n\nDownloading PDF " + (int) per + "% complete");
                }
                // setText("configuring your book pleease wait a moment");
            }
            // close the output stream when complete //
            fileOutput.close();
            // setText("Download Complete. Open PDF Application installed in the device.");
            setText("configuaration is completed now your book is ready to read");
        } catch (final MalformedURLException e) {
            setTextError("Some error occured. Press back and try again.",
                    Color.RED);
        } catch (final IOException e) {
            setTextError("Some error occured. Press back and try again.",
                    Color.RED);
        } catch (final Exception e) {
            setTextError(
                    "Failed to download image. Please check your internet connection.",
                    Color.RED);
        }
        return file;
    }

    voidsetTextError(final String message, finalint color) {
        runOnUiThread(newRunnable() {
            publicvoidrun() {
                tv_loading.setTextColor(color);
                tv_loading.setText(message);
            }
        });
    }

    voidsetText(final String txt) {
        runOnUiThread(newRunnable() {
            publicvoidrun() {
                tv_loading.setText(txt);
            }
        });

    }

    privatestaticfinalStringTAG="MyActivity";

    publicbooleanisStoragePermissionGranted() {
        if (Build.VERSION.SDK_INT >= 23) {
            if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                    == PackageManager.PERMISSION_GRANTED) {
                Log.v(TAG, "Permission is granted");
                returntrue;
            } else {

                Log.v(TAG, "Permission is revoked");
                ActivityCompat.requestPermissions(this, newString[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
                returnfalse;
            }
        } else { //permission is automatically granted on sdk<23 upon installation
            Log.v(TAG, "Permission is granted");
            returntrue;
        }


    }


    @OverridepublicvoidonRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            Log.v(TAG, "Permission: " + permissions[0] + "was " + grantResults[0]);

        }
    }

}