Not able to open pdf in new activity

问题

I'm using this github source for my project. I've a listview with 10 elements and 10 different PDFs in assets folder. In 1 activity, I'm using listview and onItemClickListener as shown below:

ArrayAdapter arrayAdapter = new ArrayAdapter<>(this, R.layout.activity_policy_list, mobileArray);
        ListView listView = (ListView) findViewById(R.id.policy_list);
        listView.setAdapter(arrayAdapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Intent intent = new Intent(PolicyActivity.this, PdfViewerActivity.class);
                intent.putExtra(PdfViewerActivity.EXTRA_PDFFILENAME, getAssets() + "/dummy.pdf");
                startActivity(intent);
            }
        });

Code for PdfViewerActivity class is as given below:

package com.dell.eventapp.ui.activity;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import com.dell.eventapp.R;

public class PdfViewerActivity extends net.sf.andpdf.pdfviewer.PdfViewerActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_pdf_viewer);
    }

    @Override
    public int getPreviousPageImageResource() {
        return R.drawable.left_arrow;
    }

    @Override
    public int getNextPageImageResource() {
        return R.drawable.right_arrow;
    }

    @Override
    public int getZoomInImageResource() {
        return R.drawable.zoom_in;
    }

    @Override
    public int getZoomOutImageResource() {
        return R.drawable.zoom_out;
    }

    @Override
    public int getPdfPasswordLayoutResource() {
        return 0;
    }

    @Override
    public int getPdfPageNumberResource() {
        return 0;
    }

    @Override
    public int getPdfPasswordEditField() {
        return 0;
    }

    @Override
    public int getPdfPasswordOkButton() {
        return 0;
    }

    @Override
    public int getPdfPasswordExitButton() {
        return 0;
    }

    @Override
    public int getPdfPageNumberEditField() {
        return 0;
    }
}

When I click on any item in list view, new activity should open up and PDF should be viewed in new activity. When I run my code, I always get this error:

02-23 18:19:48.033 8982-8982/com.dell.eventapp I/PDFVIEWER: ST='file 'android.content.res.AssetManager@817d40c/dummy.pdf' not found'

I came across this this issue in github repo's issues. It says that PDF cannot be loaded from Assets folder. You should copy it on sdcard before opening it. How can I work around it?

回答1:

intent.putExtra(PdfViewerActivity.EXTRA_PDFFILENAME, getAssets() + "/dummy.pdf");

getAssets() returns an AssetManager. getAssets() + "/dummy.pdf" calls toString() on the AssetManager instance, and then appends /dummy.pdf to it. This is why you wind up with android.content.res.AssetManager@817d40c/dummy.pdf. toString() on AssetManager does not somehow magically give you a filesystem path to an asset... in part because assets are not files on the device.

How can I work around it?

Either:

Follow the instructions in that issue and copy the asset to a file, or
Modify that library to support an asset, or
Do not use that library, but use something else that does support displaying a PDF from an asset

FWIW, I have sample apps demonstrating the use of pdf.js and pdfium for displaying PDFs from assets.

来源：https://stackoverflow.com/questions/48948625/not-able-to-open-pdf-in-new-activity

标签

android

pdf

render