Android(安卓)pdf viewer在android studio应用问题说明详解

之前一直是做.NET开发的，最近需要弄一个新闻app，能力有限，只能借助HTML5 WebAPP+android studio来完成这项工作。
android studio主要用WebView来加载发布好的WebApp，打包生产APP。

其中由于显示一些pdf文档，所以研究了一下，记录一下心得，同时也希望帮助到新手们。

android 显示网络pdf，基本原理：先将pdf文件通过DownloadManager下载到手机sdk某个文件夹中，然后通过android-pdf-viewer插件进行显示。

android-pdf-viewer插件可以直接到github上下载，地址：https://github.com/barteksc/AndroidPdfViewer
或者直接到发布好的页面下载：https://github.com/barteksc/AndroidPdfViewer/releases
我下载的是：AndroidPdfViewer-2.1.0版本zip包

将下载AndroidPdfViewer-2.1.0包解压出来，再你的app项目中，打开 File -> New -> Import Module 选择到刚才解压的文件夹

本人目录是：D:\AndroidStudioProjects\AndroidPdfViewer-2.1.0\android-pdf-viewer

完成后，回提示先ERROR：

Error:Plugin with id ‘com.github.dcendents.android-maven' not found.

解决方法：

点击你的工程Gradle Scripts目录下的bulid.gradle (Project:你的工程名)

在

buildscript { repositories { jcenter() } dependencies { classpath ‘com.android.tools.build:gradle:2.0.0' } }

中dependencies的下添加 classpath ‘com.github.dcendents:android-maven-gradle-plugin:1.3'，

Mark Modules之后，出现新的ERROR：

Error:Plugin with id ‘com.jfrog.bintray' not found.

此时同样在dependencies下添加：classpath “com.jfrog.bintray.gradle:gradle-bintray-plugin:1.0”

再次Mark Modules就不会报错了。

先就可以开始使用 android-pdf-viewer 插件了，

别忘记引用权限问题哦

先代码为项目中report activity.java,实现了接收另外一个activity跳转过来同时传递参数pdf地址，然后通过DownloadManager下载完成之后，显示pdf。

package cn.cgrs.myphone;import android.app.DownloadManager;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.content.SharedPreferences;import android.database.Cursor;import android.net.Uri;import android.os.Environment;import android.preference.PreferenceManager;import android.provider.OpenableColumns;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.webkit.MimeTypeMap;import android.webkit.WebSettings;import android.webkit.WebView;import android.widget.TextView;import android.widget.Toast;import com.github.barteksc.pdfviewer.listener.OnLoadCompleteListener;import com.github.barteksc.pdfviewer.listener.OnPageChangeListener;import com.github.barteksc.pdfviewer.scroll.DefaultScrollHandle;import com.shockwave.pdfium.PdfDocument;import java.io.File;import java.io.UnsupportedEncodingException;import java.net.URLEncoder;import java.util.List;public class Report extends AppCompatActivity implements OnPageChangeListener, OnLoadCompleteListener {private com.github.barteksc.pdfviewer.PDFView pdfView ;private TextView textView;private DownloadManager downloadManager;private SharedPreferences prefs;private static String DL_ID = "downloadId";Integer pageNumber = 0;String pdfFileName = "yyy.pdf";Uri uri;String AUrl;private Boolean isDown = false;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_report);Intent intent = getIntent(); // 获取 IntentAUrl = intent.getStringExtra("url"); // 获取 String 值Log.e("接收url:",AUrl);//AUrl = "http://www.tyyq.cn/xhsapp/download/a03790b7f27243eeada01537a2ce2f77.pdf";String[] exts = AUrl.split("/");pdfFileName = exts[exts.length-1];Log.e("pdf文件名：",pdfFileName);String pdfName = Environment.getExternalStorageDirectory() +"/download";File file = new File(pdfName, pdfFileName);pdfView = (com.github.barteksc.pdfviewer.PDFView)findViewById(R.id.pdfView);textView = (TextView) findViewById(R.id.textView);if(file.exists()){Log.e("Tip：","报告已经存在！");//文件已经存在，则直接显示uri = Uri.fromFile(file);displayFromUri(uri);textView.setVisibility(View.GONE);pdfView.setVisibility(View.VISIBLE);}else{isDown = true;}//Log.e("prefs字符串：",prefs.toString());}@Overrideprotected void onResume(){super.onResume();if(isDown){try{Log.e("Tip：","报告不存在,需要下载！");DL_ID = pdfFileName;//文件不存在需要先下载downloadManager = (DownloadManager)getSystemService(DOWNLOAD_SERVICE);prefs = PreferenceManager.getDefaultSharedPreferences(this);StartReport();}catch (Exception ex){Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show();}}}@Overrideprotected void onPause() {// TODO Auto-generated method stubsuper.onPause();//unregisterReceiver(receiver);try {unregisterReceiver(receiver);} catch (IllegalArgumentException e) {if (e.getMessage().contains("Receiver not registered")) {// Ignore this exception. This is exactly what is desired} else {// unexpected, re-throwthrow e;}}}//下载报告启动函数protected void StartReport() {// TODO Auto-generated method stubif(!prefs.contains(DL_ID) || true) { //// String url = AUrl;//Log.e("-----",AUrl);//String[] exts = url.split("/");//pdfFileName = "97b49c0822c14a01b3ebc273679bc6bf.pdf";//exts[exts.length-1];String url = AUrl;//"http://www.tyyq.cn/RollImage/11.pdf";Log.e("开始下载url：",AUrl);//开始下载Uri resource = Uri.parse(encodeGB(url));DownloadManager.Request request = new DownloadManager.Request(resource);request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_MOBILE | DownloadManager.Request.NETWORK_WIFI);request.setAllowedOverRoaming(false);//设置文件类型MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(url));request.setMimeType(mimeString);//在通知栏中显示//设置通知栏标题request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE);request.setDescription("舆情报告正在下载");//request.setShowRunningNotification(true);request.setVisibleInDownloadsUi(true);//sdcard的目录下的download文件夹request.setDestinationInExternalPublicDir("/download/", pdfFileName);request.setTitle("舆情报告");long id = downloadManager.enqueue(request);//保存idprefs.edit().putLong(DL_ID, id).commit();} else {Log.e("提示：","下载已经开始，检查状态");//下载已经开始，检查状态queryDownloadStatus();}registerReceiver(receiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));}/*** 如果服务器不支持中文路径的情况下需要转换url的编码。* @param string* @return*/public String encodeGB(String string){//转换中文编码String split[] = string.split("/");for (int i = 1; i < split.length; i++) {try {split[i] = URLEncoder.encode(split[i], "GB2312");} catch (UnsupportedEncodingException e) {e.printStackTrace();}split[0] = split[0]+"/"+split[i];}split[0] = split[0].replaceAll("\\+", "%20");//处理空格return split[0];}private BroadcastReceiver receiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {//这里可以取得下载的id，这样就可以知道哪个文件下载完成了。适用与多个下载任务的监听Log.v("intent", ""+intent.getLongExtra(DownloadManager.EXTRA_DOWNLOAD_ID, 0));queryDownloadStatus();}};private void queryDownloadStatus() {DownloadManager.Query query = new DownloadManager.Query();query.setFilterById(prefs.getLong(DL_ID, 0));Cursor c = downloadManager.query(query);if(c.moveToFirst()) {int status = c.getInt(c.getColumnIndex(DownloadManager.COLUMN_STATUS));switch(status) {case DownloadManager.STATUS_PAUSED:Log.v("down", "STATUS_PAUSED");case DownloadManager.STATUS_PENDING:Log.v("down", "STATUS_PENDING");case DownloadManager.STATUS_RUNNING://正在下载，不做任何事情Log.v("down", "STATUS_RUNNING");break;case DownloadManager.STATUS_SUCCESSFUL://完成Log.v("down", "下载完成");String pdfName = Environment.getExternalStorageDirectory() +"/download";File file = new File(pdfName, pdfFileName);uri = Uri.fromFile(file);Log.e("----",uri.toString());displayFromUri(uri);textView.setVisibility(View.GONE);pdfView.setVisibility(View.VISIBLE);break;case DownloadManager.STATUS_FAILED://清除已下载的内容，重新下载Log.v("down", "STATUS_FAILED");downloadManager.remove(prefs.getLong(DL_ID, 0));prefs.edit().clear().commit();break;}}}/*pdf显示函数集合*/private void displayFromUri(Uri urii) {//pdfFileName = getFileName(urii);pdfView.fromUri(urii).defaultPage(pageNumber).onPageChange(this).enableAnnotationRendering(true).onLoad(this).scrollHandle(new DefaultScrollHandle(this)).load();}public void onResult(int resultCode, Intent intent) {if (resultCode == RESULT_OK) {uri = intent.getData();displayFromUri(uri);}}@Overridepublic void onPageChanged(int page, int pageCount) {pageNumber = page;setTitle(String.format("%s %s / %s", pdfFileName, page + 1, pageCount));}public String getFileName(Uri uri) {String result = null;if (uri.getScheme().equals("content")) {Cursor cursor = getContentResolver().query(uri, null, null, null, null);try {if (cursor != null && cursor.moveToFirst()) {result = cursor.getString(cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME));}} finally {if (cursor != null) {cursor.close();}}}if (result == null) {result = uri.getLastPathSegment();}return result;}@Overridepublic void loadComplete(int nbPages) {PdfDocument.Meta meta = pdfView.getDocumentMeta();printBookmarksTree(pdfView.getTableOfContents(), "-");}public void printBookmarksTree(List tree, String sep) {for (PdfDocument.Bookmark b : tree) {// Log.e(TAG, String.format("%s %s, p %d", sep, b.getTitle(), b.getPageIdx()));if (b.hasChildren()) {printBookmarksTree(b.getChildren(), sep + "-");}}}}

以上所述是小编给大家介绍的Android pdf viewer在android studio应用问题说明详解，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！

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