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我正在尝试实现一个程序来读取 pdf 文件，但是当我这样做时，我无法在第一次和第二次显示页面时显示几个带有重叠单词的页面。我不明白出了什么问题任何人都可以建议我该怎么办？

public class MainActivity extends ListActivity {

String[] pdflist;
File[] imagelist;

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

    File images = Environment.getExternalStorageDirectory();
    System.out.println("images" + images);
    imagelist = images.listFiles(new FilenameFilter() {
        public boolean accept(File dir, String name) {
            return ((name.endsWith(".pdf")));
        }
    });
    pdflist = new String[imagelist.length];
    for (int i = 0; i < imagelist.length; i++) {
        pdflist[i] = imagelist[i].getName();
    }
    this.setListAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, pdflist));
}

protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
    String path = imagelist[(int) id].getAbsolutePath();
    openPdfIntent(path);
}

private void openPdfIntent(String path) {
    try {
        final Intent intent = new Intent(MainActivity.this, Second.class);
        intent.putExtra(PdfViewerActivity.EXTRA_PDFFILENAME, path);
        startActivity(intent);
    } catch (Exception e) {
        e.printStackTrace();
    }
}
}

日志详细信息：

02-04 13:14:09.232: E/PDFVIEWER(1123): null
02-04 13:14:09.232: E/PDFVIEWER(1123): java.nio.BufferUnderflowException
02-04 13:14:09.232: E/PDFVIEWER(1123):  at java.nio.Buffer.checkGetBounds(Buffer.java:177)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at java.nio.DirectByteBuffer.get(DirectByteBuffer.java:41)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at java.nio.MappedByteBufferAdapter.get(MappedByteBufferAdapter.java:144)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at java.nio.ByteBuffer.get(ByteBuffer.java:384)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at net.sf.andpdf.nio.NioByteBuffer.get(NioByteBuffer.java:99)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.decode.FlateDecode.decode(FlateDecode.java:68)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.decode.PDFDecoder.decodeStream(PDFDecoder.java:92)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.PDFObject.decodeStream(PDFObject.java:334)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.PDFObject.getStreamBuffer(PDFObject.java:307)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.PDFFile.dereference(PDFFile.java:272)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.PDFObject.dereference(PDFObject.java:686)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.PDFObject.getDictRef(PDFObject.java:508)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.PDFFile.findPage(PDFFile.java:1696)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at com.sun.pdfview.PDFFile.getPage(PDFFile.java:1569)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at net.sf.andpdf.pdfviewer.PdfViewerActivity.showPage(PdfViewerActivity.java:779)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at net.sf.andpdf.pdfviewer.PdfViewerActivity.access$12(PdfViewerActivity.java:769)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at net.sf.andpdf.pdfviewer.PdfViewerActivity$3.run(PdfViewerActivity.java:259)
02-04 13:14:09.232: E/PDFVIEWER(1123):  at java.lang.Thread.run(Thread.java:856)

二等：

package com.syntel.pdfviewer;

import android.os.Bundle;
import net.sf.andpdf.pdfviewer.PdfViewerActivity;

public class Second extends PdfViewerActivity {

@Override
public void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
}

public int getPreviousPageImageResource() {
    return R.drawable.ic_launcher;
}

public int getNextPageImageResource() {
    return R.drawable.ic_launcher;
}

public int getZoomInImageResource() {
    return R.drawable.ic_launcher;
}

public int getZoomOutImageResource() {
    return R.drawable.ic_launcher;
}

@Override
public int getPdfPageNumberEditField() {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public int getPdfPageNumberResource() {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public int getPdfPasswordEditField() {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public int getPdfPasswordExitButton() {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public int getPdfPasswordLayoutResource() {
    // TODO Auto-generated method stub
    return 0;
}

@Override
public int getPdfPasswordOkButton() {
    // TODO Auto-generated method stub
    return 0;
}

/*
 * public int getPdfPasswordLayoutResource() { return R.layout.ic_launcher;
 * }
 * 
 * public int getPdfPageNumberResource() { return
 * R.layout.dialog_pagenumber; }
 * 
 * public int getPdfPasswordEditField() { return R.id.etPassword; }
 * 
 * public int getPdfPasswordOkButton() { return R.id.btOK; }
 * 
 * public int getPdfPasswordExitButton() { return R.id.btExit; }
 * 
 * public int getPdfPageNumberEditField() { return R.id.pagenum_edit; }
 */
}
4

1 回答 1

1

尝试这个：

让我们使用PDFViewer.jar以下位置的文件：

http://www.filecrop.com/pdf-viewer.jar.html

只要让我知道它是否对你有用。

更新：

如果要从资产文件夹加载文件，只需获取该文件夹的路径，例如：

File mFile = new File("file:///android_asset/yourFilename.pdf");

于 2014-02-05T05:16:10.553 回答