5
Jedesmal, wenn ich den Java-CodeAndroid Studio - PDFRendererBasic - sample.pdf kann nicht ersetzt werden?
mFileDescriptor = context.getAssets().openFd("sample.pdf").getParcelFileDescriptor();
auf einen anderen pdf PDFRendererBasicFragment bearbeiten im Anlagenordner, stürzt die Anwendung platziert ..
Logcat Berichte:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.pdfrendererbasic/com.example.android.pdfrendererbasic.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.pdf.PdfRenderer.getPageCount()' on a null object reference
Warum ist das passiert? Ich habe sogar versucht, mein PDF in sample.pdf umzubenennen, bevor es gebaut wird, und es stürzt immer noch ab. Alles funktioniert gut mit dem ursprünglichen Code, ich werde das PDF einfach nicht ersetzen.
Stack Trace:
02-11 11:11:50.130 18201-18201/com.example.android.pdfrendererbasic I/art: Not late-enabling -Xcheck:jni (already on)
02-11 11:11:50.130 18201-18201/com.example.android.pdfrendererbasic I/art: Late-enabling JIT
02-11 11:11:50.132 18201-18201/com.example.android.pdfrendererbasic I/art: JIT created with code_cache_capacity=2MB compile_threshold=1000
02-11 11:11:50.201 18201-18201/com.example.android.pdfrendererbasic W/System: ClassLoader referenced unknown path: /data/app/com.example.android.pdfrendererbasic-1/lib/x86
02-11 11:11:50.252 18201-18201/com.example.android.pdfrendererbasic W/System.err: java.io.IOException: cannot create document. Error: 3
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.graphics.pdf.PdfRenderer.nativeCreate(Native Method)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.graphics.pdf.PdfRenderer.<init>(PdfRenderer.java:153)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at com.example.android.pdfrendererbasic.PdfRendererBasicFragment.openRenderer(PdfRendererBasicFragment.java:141)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at com.example.android.pdfrendererbasic.PdfRendererBasicFragment.onAttach(PdfRendererBasicFragment.java:108)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.Fragment.onAttach(Fragment.java:1380)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:932)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.BackStackRecord.run(BackStackRecord.java:793)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.FragmentController.execPendingActions(FragmentController.java:325)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.Activity.performStart(Activity.java:6252)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.ActivityThread.-wrap11(ActivityThread.java)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.os.Handler.dispatchMessage(Handler.java:102)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.os.Looper.loop(Looper.java:148)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5417)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at java.lang.reflect.Method.invoke(Native Method)
02-11 11:11:50.253 18201-18201/com.example.android.pdfrendererbasic W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
02-11 11:11:50.254 18201-18201/com.example.android.pdfrendererbasic W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
02-11 11:11:51.082 18201-18201/com.example.android.pdfrendererbasic D/AndroidRuntime: Shutting down VM
02-11 11:11:51.082 18201-18201/com.example.android.pdfrendererbasic E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.android.pdfrendererbasic, PID: 18201
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.pdfrendererbasic/com.example.android.pdfrendererbasic.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.pdf.PdfRenderer.getPageCount()' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.pdf.PdfRenderer.getPageCount()' on a null object reference
at com.example.android.pdfrendererbasic.PdfRendererBasicFragment.showPage(PdfRendererBasicFragment.java:163)
at com.example.android.pdfrendererbasic.PdfRendererBasicFragment.onViewCreated(PdfRendererBasicFragment.java:101)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:988)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1148)
at android.app.BackStackRecord.run(BackStackRecord.java:793)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1535)
at android.app.FragmentController.execPendingActions(FragmentController.java:325)
at android.app.Activity.performStart(Activity.java:6252)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2379)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
PDFRendererBasicFragment.java:
/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.example.android.pdfrendererbasic;
import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.pdf.PdfRenderer;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.IOException;
/**
* This fragment has a big {@ImageView} that shows PDF pages, and 2 {@link android.widget.Button}s to move between
* pages. We use a {@link android.graphics.pdf.PdfRenderer} to render PDF pages as {@link android.graphics.Bitmap}s.
*/
public class PdfRendererBasicFragment extends Fragment implements View.OnClickListener {
/**
* Key string for saving the state of current page index.
*/
private static final String STATE_CURRENT_PAGE_INDEX = "current_page_index";
/**
* File descriptor of the PDF.
*/
private ParcelFileDescriptor mFileDescriptor;
/**
* {@link android.graphics.pdf.PdfRenderer} to render the PDF.
*/
private PdfRenderer mPdfRenderer;
/**
* Page that is currently shown on the screen.
*/
private PdfRenderer.Page mCurrentPage;
/**
* {@link android.widget.ImageView} that shows a PDF page as a {@link android.graphics.Bitmap}
*/
private ImageView mImageView;
/**
* {@link android.widget.Button} to move to the previous page.
*/
private Button mButtonPrevious;
/**
* {@link android.widget.Button} to move to the next page.
*/
private Button mButtonNext;
public PdfRendererBasicFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_pdf_renderer_basic, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// Retain view references.
mImageView = (ImageView) view.findViewById(R.id.image);
mButtonPrevious = (Button) view.findViewById(R.id.previous);
mButtonNext = (Button) view.findViewById(R.id.next);
// Bind events.
mButtonPrevious.setOnClickListener(this);
mButtonNext.setOnClickListener(this);
// Show the first page by default.
int index = 0;
// If there is a savedInstanceState (screen orientations, etc.), we restore the page index.
if (null != savedInstanceState) {
index = savedInstanceState.getInt(STATE_CURRENT_PAGE_INDEX, 0);
}
showPage(index);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
openRenderer(activity);
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(activity, "Error! " + e.getMessage(), Toast.LENGTH_SHORT).show();
activity.finish();
}
}
@Override
public void onDetach() {
try {
closeRenderer();
} catch (IOException e) {
e.printStackTrace();
}
super.onDetach();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (null != mCurrentPage) {
outState.putInt(STATE_CURRENT_PAGE_INDEX, mCurrentPage.getIndex());
}
}
/**
* Sets up a {@link android.graphics.pdf.PdfRenderer} and related resources.
*/
private void openRenderer(Context context) throws IOException {
// In this sample, we read a PDF from the assets directory.
mFileDescriptor = context.getAssets().openFd("sample.pdf").getParcelFileDescriptor();
// This is the PdfRenderer we use to render the PDF.
mPdfRenderer = new PdfRenderer(mFileDescriptor);
}
/**
* Closes the {@link android.graphics.pdf.PdfRenderer} and related resources.
*
* @throws java.io.IOException When the PDF file cannot be closed.
*/
private void closeRenderer() throws IOException {
if (null != mCurrentPage) {
mCurrentPage.close();
}
mPdfRenderer.close();
mFileDescriptor.close();
}
/**
* Shows the specified page of PDF to the screen.
*
* @param index The page index.
*/
private void showPage(int index) {
if (mPdfRenderer.getPageCount() <= index) {
return;
}
// Make sure to close the current page before opening another one.
if (null != mCurrentPage) {
mCurrentPage.close();
}
// Use `openPage` to open a specific page in PDF.
mCurrentPage = mPdfRenderer.openPage(index);
// Important: the destination bitmap must be ARGB (not RGB).
Bitmap bitmap = Bitmap.createBitmap(mCurrentPage.getWidth(), mCurrentPage.getHeight(),
Bitmap.Config.ARGB_8888);
// Here, we render the page onto the Bitmap.
// To render a portion of the page, use the second and third parameter. Pass nulls to get
// the default result.
// Pass either RENDER_MODE_FOR_DISPLAY or RENDER_MODE_FOR_PRINT for the last parameter.
mCurrentPage.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
// We are ready to show the Bitmap to user.
mImageView.setImageBitmap(bitmap);
updateUi();
}
/**
* Updates the state of 2 control buttons in response to the current page index.
*/
private void updateUi() {
int index = mCurrentPage.getIndex();
int pageCount = mPdfRenderer.getPageCount();
mButtonPrevious.setEnabled(0 != index);
mButtonNext.setEnabled(index + 1 < pageCount);
getActivity().setTitle(getString(R.string.app_name_with_index, index + 1, pageCount));
}
/**
* Gets the number of pages in the PDF. This method is marked as public for testing.
*
* @return The number of pages.
*/
public int getPageCount() {
return mPdfRenderer.getPageCount();
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.previous: {
// Move to the previous page
showPage(mCurrentPage.getIndex() - 1);
break;
}
case R.id.next: {
// Move to the next page
showPage(mCurrentPage.getIndex() + 1);
break;
}
}
}
}
ich meine ursprüngliche Frage bearbeitet haben, um den Code zu enthalten. es befindet sich am unteren Rand des PDFRendererBasic.java. Ich habe auch alle Logcat enthalten. Dies sollte in der Lage sein, den Fehler in Ihrer Umgebung zu replizieren. Laden Sie einfach https://github.com/googlesamples/android-PdfRendererBasic herunter und versuchen Sie, die PDF-Datei zu ersetzen. – emvee
Ok, ich konnte das PDF bekommen, nachdem ich das PDF von einem .doc neu erstellt habe. Aber jetzt ist die Formatierung beschädigt. Beachten Sie, dass die PDF-Datei in Adobe angezeigt wird. Es gibt eine Reihe von "M" anstelle von Text. Dieses PDF enthält Tabellen und Foren sowie Hyperlinks. Ich habe versucht, die Hyperlinks zu entfernen, aber es zeigt sich immer noch bei Frau. Ich werde versuchen, die Formatierung und dann die Tabellen zu entfernen, um zu sehen, was das Problem verursacht. Aber diese Klasse funktioniert nicht mit allen PDFs out of the box. – emvee
diese Klasse scheint sehr buggy, jetzt kann ich nicht mehr ein PDF anzeigen, das nur angezeigt wurde ... ausspucken gleichen Fehler wie in meinem OG-Post veröffentlicht. – emvee