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Android Studio - PDFRendererBasic - Failed to replace sample.pdf?

Every time I edit java code PDFRendererBasicFragment

mFileDescriptor = context.getAssets().openFd("sample.pdf").getParcelFileDescriptor();

to another PDF file placed in the resource folder, the application crashes.

Logcat reports:

 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

Why is this happening? I even tried renaming my PDF to sample.pdf before creating it, and it will work anyway. Everything works fine with the source code, just won't let me replace the PDF.

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; } } } }
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2 answers

Downgrade gradle from version 2.2.0 to 2.1.2 and the crash will disappear.

In build.gradle (Project) replace

 classpath 'com.android.tools.build:gradle:2.2.0'

with

 classpath 'com.android.tools.build:gradle:2.1.2'
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The same issue you were talking about is reported and described here . The problem seems to be related to how Android Studio creates the final apk file. Although the solution for manually repackaging the apk file is provided in this link, it is not very practical. The error does not seem to have another simple solution.

EDIT

Here is the solution from the link provided. However, the mentioned issue mentions a slightly different error message, so this may not work.

  • Launch Android Studio
  • Click Import Android Sample Code
  • Choose Graphics> Pdf Renderer Basic
  • Click "Next"
  • Click Finish.
  • Click Run> Run Application

Running the application implicitly creates the file Application / build / output / apk / Application-debug.apk.

6.a: Health Check: Make sure the META-INF records are at the end of the file:

 $ unzip -lv Application/build/outputs/apk/Application-debug.apk ... 1569 Defl:N 702 55% 12-16-14 17:35 c7cb7a03 META-INF/MANIFEST.MF 1598 Defl:N 724 55% 12-16-14 17:35 034c0dfc META-INF/CERT.SF 776 Defl:N 605 22% 12-16-14 17:35 2be8b27c META-INF/CERT.RSA -------- ------- --- ------- 1565085 849785 46% 21 files

  1. Manually re-sign the package using jarsigner. The purpose of this is to have META-INF records at the beginning of .apk:

    $ yes android | keytool -genkey -v -keystore demo.keystore -alias demo -keyalg RSA -keysize 2048 -validity 10000 -dname "CN = Mark Smith" $ cp Application / assembly / outputs / apk / Application-debug.apk A.apk $ zip -d A.apk META-INF / MANIFEST.MF $ zip -d A.apk META-INF / CERT.SF $ zip -d A.apk META-INF / CERT.RSA $ jarsigner -keystore demo.keystore -storepass android \ -keypass android -digestalg SHA1 -sigalg md5withRSA \ -signedjar A-unaligned.apk A.apk \ demo $ zipalign 4 A-unaligned.apk A-aligned.apk

  2. Install the re-signed package:

    $ adb uninstall com.example.android.pdfrendererbasic $ adb install A-aligned.apk

  3. Run the new package:

    $ adb shell am start com.example.android.pdfrendererbasic / .MainActivity

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Source: https://habr.com/ru/post/1242797/

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