Opening pdf file Error: This file could not be accessed. Check your location or network and try again. Android 6 Marshmallow

Question

I am trying to get a file from external storage, then I have to send this file to PDF readers using intentions. Previously, the code below worked fine, but after installing Android 6 (Marshmallow Update), my code does not work and receives a message with a toast

" Failed to access this file. Check your location or network and try again ."

(This is due to the new runtime permissions for Android). I just tried all the solutions (content providers, etc., but didn't work) Any solutions?

 File file = new File(getFilesDir(), "myfile.pdf");
 Intent intent = new Intent(Intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(file), "application/pdf");
        intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
        Intent intentChooser = Intent.createChooser(intent, "Choose Pdf Application");
        try {
            startActivity(intentChooser);
        } catch (ActivityNotFoundException e) {
            //com.adobe.reader
            startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://play.google.com/store/apps/details?id=com.adobe.reader")));
        }

Answer 1

, Android:

1: SampleContentProvider

import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.ParcelFileDescriptor;

import java.io.File;
import java.io.FileNotFoundException;

/**
 * Created by naveed on 7/2/16.
 */
public class SampleContentProvider extends ContentProvider {

    @Override
    public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
        File privateFile = new File(uri.getPath());
        return ParcelFileDescriptor.open(privateFile, ParcelFileDescriptor.MODE_READ_ONLY);
    }

    @Override
    public boolean onCreate() {
        return false;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        return null;
    }

    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        return 0;
    }
}

2: :

<provider
        android:name=".SampleContentProvider"
        android:authorities="your_package_name"
        android:exported="true" />

3: , , Uri

  Intent intent = new Intent(Intent.ACTION_VIEW);
        File file = new File(getFilesDir(), "myfile.pdf");
        String absoluteFilePath = file.getAbsolutePath();
        String mimeType = "application/pdf";
        Uri uri = Uri.parse("content://"+"Your_package_name"+"/" + absoluteFilePath);
        intent.setDataAndType(uri, mimeType);
        Intent intentChooser = Intent.createChooser(intent, "Choose Pdf Application");
        startActivity(intentChooser);

, . .

Answer 2

FileProvider ( Android Nougat - android.os.FileUriExposedException), , :

Uri uri = FileProvider.getUriForFile(
                                context,
                                context.getApplicationContext().getPackageName(), myFile);

                        Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
                        pdfIntent.setDataAndType(apkURI, "application/pdf");
                        pdfIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                        pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                        grantAllUriPermissions(context, pdfIntent, apkURI);

grantAllUriPermissions():

private void grantAllUriPermissions(Context context, Intent intent, Uri uri) {
        List<ResolveInfo> resInfoList = context.getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
        for (ResolveInfo resolveInfo : resInfoList) {
            String packageName = resolveInfo.activityInfo.packageName;
            context.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
        }
}

Answer 3

After considering the answers above, the simplest solution is as follows.

    Uri pdf = FileProvider.getUriForFile(this, this.getApplicationContext().getPackageName() + ".provider", file);

    Intent pdfOpenintent = new Intent(Intent.ACTION_VIEW);
    pdfOpenintent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_ACTIVITY_CLEAR_TOP);
    pdfOpenintent.setDataAndType(pdf, "application/pdf");

    try {
        startActivity(pdfOpenintent);
    } catch (ActivityNotFoundException e) {
        // handle no application here....
    }

The key must simultaneously set FLAG_GRANT_READ_URI_PERMISSION and FLAG_ACTIVITY_CLEAR_TOP.

Make sure your provider is listed in ApplicationManifest.xml

<provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths"/>
    </provider>

Hers - provider_paths file

<?xml version="1.0" encoding="utf-8"?>
<paths>
    <external-path name="external_files" path="."/>
</paths>

Answer 4

Fires intend to process files of known types mime, Code:

private void openFile(Uri fileUri) {

    String mimeType = mModel.getMimeType(fileUri);

    if (mimeType != null) { //we have determined a mime type and can probably handle the file.
        try {
            /*Implicit intent representing the action we want.  The system will determine is it
            can handle the request.*/
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setDataAndType(fileUri, mimeType);

            //We ask the Activity to start this intent.
            mView.getActivity().startActivity(i);
        } catch (ActivityNotFoundException e) {
            /*If we have figured out the mime type of the file, but have no application installed
            to handle it, send the user a message.
             */
            Toast.makeText(mView.getActivity(), "The System understands this file type," +
                            "but no applications are installed to handle it.",
                    Toast.LENGTH_LONG).show();
        }
    } else {
        /*if we can't figure out the mime type of the file, let the user know.*/
        Toast.makeText(mView.getActivity(), "System doesn't know how to handle that file type!",
                Toast.LENGTH_LONG).show();
    }
}