在我的应用程序中，我必须在 android 中显示来自 sdcard 的 PDF 文件。该应用程序使用选项卡功能，因此我在我的应用程序中使用了片段。那么如何在片段中显示pdf文件呢？我使用了 pdfviewer.jar，但我无法在片段中显示，它只适用于活动。
另一个问题是我想显示具有多缩放和垂直页面滚动的 pdf 以查看下一页/上一页，而不是通过手动单击缩放图标和箭头图标来查看 pdfviewer.jar 中使用的下一页。
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2 回答
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我在下面给出了该更改片段的完整代码。我在 3 年前做过，那时使用了 Sherlock 库。我认为现在你必须用 appcompat 库替换它。
package net.sf.andpdf.pdfviewer;
import java.io.*;
import java.nio.channels.FileChannel;
import android.app.Activity;
import android.content.res.Configuration;
import android.graphics.*;
import android.widget.ImageView;
import android.widget.TextView;
import net.sf.andpdf.nio.ByteBuffer;
import net.sf.andpdf.pdfviewer.gui.TouchImageView;
import net.sf.andpdf.refs.HardReference;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.sun.pdfview.PDFFile;
import com.sun.pdfview.PDFImage;
import com.sun.pdfview.PDFPage;
import com.sun.pdfview.PDFPaint;
import com.sun.pdfview.decrypt.PDFAuthenticationFailureException;
import com.sun.pdfview.decrypt.PDFPassword;
import com.sun.pdfview.font.PDFFont;
public class PdfViewerFragment extends SherlockFragment {
private static final int STARTPAGE = 1;
private static float STARTZOOM = 1f;
private static final String TAG = "PDFVIEWER";
private static final String FTAG = "PDFVIEWERFRG";
public static final String EXTRA_PDFFILENAME = "net.sf.andpdf.extra.PDFFILENAME";
public static final String EXTRA_SHOWIMAGES = "net.sf.andpdf.extra.SHOWIMAGES";
public static final String EXTRA_ANTIALIAS = "net.sf.andpdf.extra.ANTIALIAS";
public static final String EXTRA_USEFONTSUBSTITUTION = "net.sf.andpdf.extra.USEFONTSUBSTITUTION";
public static final String EXTRA_KEEPCACHES = "net.sf.andpdf.extra.KEEPCACHES";
public static final boolean DEFAULTSHOWIMAGES = true;
public static final boolean DEFAULTANTIALIAS = true;
public static final boolean DEFAULTUSEFONTSUBSTITUTION = false;
public static final boolean DEFAULTKEEPCACHES = true;
private String pdffilename;
private PDFFile mPdfFile;
private int mPage;
private float mZoom;
private File mTmpFile;
private ProgressDialog progress;
private TextView tv_page_no;
String imgFileName;
private ImageView rightArrow;
private ImageView leftArrow;
private PDFPage mPdfPage;
private Thread backgroundThread;
private Activity activity;
TouchImageView tiv;
@Override
public void onAttach(Activity activity) {
Log.i(FTAG, "PDFFragment.onAttatch");
this.activity = activity;
super.onAttach(activity);
}
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Display display = activity.getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();
if(activity.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE )
{
STARTZOOM = (1f*width)/800.0f;
}
else
{
STARTZOOM = (1f*height)/800.0f;
}
Log.i(FTAG, "PDFFragment: onCreate");
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.i(FTAG, "PDFFragment: onCreateView");
View docView = inflater.inflate(R.layout.doc_viewer, container, false);
setRetainInstance(true);
boolean showImages = activity.getIntent().getBooleanExtra(PdfViewerFragment.EXTRA_SHOWIMAGES, PdfViewerFragment.DEFAULTSHOWIMAGES);
PDFImage.sShowImages = showImages;
boolean antiAlias = activity.getIntent().getBooleanExtra(PdfViewerFragment.EXTRA_ANTIALIAS, PdfViewerFragment.DEFAULTANTIALIAS);
PDFPaint.s_doAntiAlias = antiAlias;
boolean useFontSubstitution = activity.getIntent().getBooleanExtra(PdfViewerFragment.EXTRA_USEFONTSUBSTITUTION, PdfViewerFragment.DEFAULTUSEFONTSUBSTITUTION);
PDFFont.sUseFontSubstitution= useFontSubstitution;
boolean keepCaches = activity.getIntent().getBooleanExtra(PdfViewerFragment.EXTRA_KEEPCACHES, PdfViewerFragment.DEFAULTKEEPCACHES);
HardReference.sKeepCaches= keepCaches;
Bundle args = getArguments();
if (args != null) {
Log.i(FTAG, "Args Value: "+args.getString(EXTRA_PDFFILENAME));
pdffilename = args.getString(EXTRA_PDFFILENAME);;
} else {
// TODO: open a default document
pdffilename = "/mnt/sdcard/documents/3.pdf";
}
tiv = (TouchImageView) docView.findViewById(R.id.imageView);
leftArrow = (ImageView) docView.findViewById(R.id.leftArrow);
rightArrow = (ImageView) docView.findViewById(R.id.rightArrow);
leftArrow.setVisibility(View.GONE);
rightArrow.setVisibility(View.GONE);
if (pdffilename == null)
{
pdffilename = "No file selected";
}
else if(pdffilename.contains(".pdf"))
{
imgFileName= pdffilename.substring(0, pdffilename.lastIndexOf("."))+"_1.jpg";
mPage = STARTPAGE;
mZoom = STARTZOOM;
progress = ProgressDialog.show(activity, "Loading", "Loading PDF Page", true, true);
leftArrow.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
prevPage();
}
});
rightArrow.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
nextPage();
}
});
tv_page_no = (TextView) docView.findViewById(R.id.navigationText);
tiv.setParent(this);
setContent(null);
}
else if(pdffilename.contains(".jpg") || pdffilename.contains(".jpeg") || pdffilename.contains(".png") || pdffilename.contains(".gif") || pdffilename.contains(".bmp"))
{
imgFileName = pdffilename;
tiv.setImageLocation(imgFileName);
}
else
{
pdffilename = "Invalid file extension";
}
return docView;
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
Log.i(FTAG, "PDFFragment: onViewCreated");
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.i(FTAG, "PDFFragment: onActivityCreated");
}
@Override
public void onStart() {
Log.i(FTAG, "PDFFragment.onStart");
super.onStart();
//Bundle args = getArguments();
}
@Override
public void onResume() {
Log.i(FTAG, "PDFFragment.onResume");
super.onResume();
}
@Override
public void onPause() {
Log.i(FTAG, "PDFFragment.onPause");
super.onPause();
}
@Override
public void onSaveInstanceState(Bundle outState) {
Log.i(FTAG, "PDFFragment.onSaveInstanceState");
super.onSaveInstanceState(outState);
}
@Override
public void onStop() {
Log.i(FTAG, "PDFFragment.onStop");
super.onStop();
}
@Override
public void onDestroyView() {
Log.i(FTAG, "PDFFragment.onDestroyView");
super.onDestroyView();
}
@Override
public void onDestroy() {
Log.i(FTAG, "PDFFragment.onDestroy");
super.onDestroy();
if (mTmpFile != null) {
mTmpFile.delete();
mTmpFile = null;
}
}
@Override
public void onDetach() {
Log.i(FTAG, "PDFFragment.onDetach");
super.onDetach();
}
private boolean setContent(String password) {
try {
parsePDF(pdffilename, password);
if(new File(imgFileName).exists())
{
tiv.setImageLocation(imgFileName);
updateTexts(1);
progress.dismiss();
}
else
startRenderThread(mPage, mZoom);
}
catch (PDFAuthenticationFailureException e) {
} catch (Exception e) {
}
return true;
}
public synchronized void startRenderThread(final int page, final float zoom) {
if (backgroundThread != null)
return;
backgroundThread = new Thread(new Runnable() {
public void run() {
try {
if (mPdfFile != null) {
generatePDFPage(page, zoom);
}
} catch (Exception e) {
Log.e(TAG, e.getMessage(), e);
}
backgroundThread = null;
}
});
backgroundThread.start();
}
public void nextPage() {
if (mPdfFile != null) {
if (mPage < mPdfFile.getNumPages()) {
mPage += 1;
imgFileName= pdffilename.substring(0, pdffilename.lastIndexOf("."))+"_"+String.valueOf(mPage)+".jpg";
if(new File(imgFileName).exists())
{
tiv.setImageLocation(imgFileName);
updateTexts(mPage);
progress.dismiss();
}
else
{
progress = ProgressDialog.show(activity, "Loading", "Loading PDF Page " + mPage, true, true);
startRenderThread(mPage, STARTZOOM);
}
}
}
}
public void prevPage() {
if (mPdfFile != null) {
if (mPage > 1) {
mPage -= 1;
imgFileName= pdffilename.substring(0, pdffilename.lastIndexOf("."))+"_"+String.valueOf(mPage)+".jpg";
if(new File(imgFileName).exists())
{
tiv.setImageLocation(imgFileName);
updateTexts(mPage);
progress.dismiss();
}
else
{
progress = ProgressDialog.show(activity, "Loading", "Loading PDF Page " + mPage, true, true);
startRenderThread(mPage, STARTZOOM);
}
}
}
}
protected void updateTexts(int pageNo) {
if (mPdfFile != null) {
tv_page_no.setText("Page "+pageNo+"/"+mPdfFile.getNumPages());
if(mPdfFile.getNumPages() > 1)
{
if(pageNo==1)
leftArrow.setVisibility(View.GONE);
else
leftArrow.setVisibility(View.VISIBLE);
if(pageNo == mPdfFile.getNumPages())
rightArrow.setVisibility(View.GONE);
else
rightArrow.setVisibility(View.VISIBLE);
}
}
}
public void generatePDFPage(final int page, float zoom) throws Exception {
try {
// Only load the page if it's a different page (i.e. not just changing the zoom level)
if (mPdfPage == null || mPdfPage.getPageNumber() != page) {
mPdfPage = mPdfFile.getPage(page, true);
}
float width = mPdfPage.getWidth();
float height = mPdfPage.getHeight();
RectF clip = null;
Bitmap bmp = mPdfPage.getImage((int)(width*zoom), (int)(height*zoom), clip, true, true);
//imgFileName += String.valueOf(page)+".jpg";
FileOutputStream fo = null;
try {
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 50, bytes);
File f = new File(imgFileName);
f.createNewFile();
fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
} catch (Exception ex) {
} finally {
if (fo != null) {
try {
fo.close();
} catch (IOException e) {
e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
}
}
}
activity.runOnUiThread(new Runnable() {
public void run() {
tiv.setImageLocation(imgFileName);
//tiv.setImageBitmap(BitmapFactory.decodeFile(imgFileName));
updateTexts(page);
if (progress != null)
progress.dismiss();
}
});
} catch (Throwable e) {
Log.e(TAG, e.getMessage(), e);
}
}
public void parsePDF(String filename, String password) throws PDFAuthenticationFailureException {
pdffilename = filename;
try {
File f = new File(filename);
long len = f.length();
if (len == 0) {
}
else {
openFile(f, password);
}
}
catch (PDFAuthenticationFailureException e) {
throw e;
} catch (Throwable e) {
e.printStackTrace();
}
}
/**
* <p>Open a specific pdf file. Creates a DocumentInfo from the file,
* and opens that.</p>
*
* <p><b>Note:</b> Mapping the file locks the file until the PDFFile
* is closed.</p>
*
* @param file the file to open
* @throws IOException
*/
public void openFile(File file, String password) throws IOException {
// first open the file for random access
RandomAccessFile raf = null;
try
{
raf = new RandomAccessFile(file, "r");
// extract a file channel
FileChannel channel = raf.getChannel();
// now memory-map a byte-buffer
ByteBuffer bb = ByteBuffer.NEW(channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size()));
// create a PDFFile from the data
if (password == null)
mPdfFile = new PDFFile(bb);
else
mPdfFile = new PDFFile(bb, new PDFPassword(password));
} catch (Exception ex)
{
} finally {
raf.close();
}
}
}
于 2015-11-26T07:33:01.330 回答
0
这是在片段中使用 PDFViewer 加载 PDF
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_keluarga, container, false);
pdfView = (PDFView) v.findViewById(R.id.keluargaPdf);
pdfView.fromAsset("tiga.pdf").load();
// Inflate the layout for this fragment
return v;
}
于 2018-07-09T11:49:25.760 回答