Android PDF阅读

在米多财富的时候遇到PDF阅读的问题，搞了很久，显示效果都不怎么样，后来放弃在APP中显示

在世纪保众又遇到了这个PDF阅读的需求，通过查阅Android官方的API发现了

显示的效果

主要代码：

/** 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() {}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {return inflater.inflate(R.layout.fragment_pdf_renderer_basic, container, false);}@Overridepublic 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);}@Overridepublic 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();}}@Overridepublic void onDetach() {try {closeRenderer();} catch (IOException e) {e.printStackTrace();}super.onDetach();}@Overridepublic 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();}@Overridepublic void onClick(View view) {switch (view.getId()) {case R.id.previous: {// Move to the previous pageshowPage(mCurrentPage.getIndex() - 1);break;}case R.id.next: {// Move to the next pageshowPage(mCurrentPage.getIndex() + 1);break;}}}}

资源下载地址:http://download.csdn.net/detail/qq_18833399/9522929

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