Android 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

<uses-permission android:name="android.permission.access_network_state" />
<uses-permission android:name="android.permission.access_wifi_state" />
<uses-permission android:name="android.permission.internet" />
<uses-permission android:name="android.permission.write_external_storage"/>
<uses-permission android:name="android.permission.read_external_storage" />
<uses-permission android:name="android.permission.download_without_notification"/>
<uses-permission android:name="android.permission.install_packages" />

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;
@override
protected void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_report);
intent intent = getintent(); // 获取 intent
aurl = 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());
}
@override
protected 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();
}
}
}
@override
protected void onpause() {
// todo auto-generated method stub
super.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-throw
throw e;
}
}
}
//下载报告启动函数
protected void startreport() {
// todo auto-generated method stub
if(!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id
prefs.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() {
@override
public 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);
}
}
@override
public 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;
}
@override
public void loadcomplete(int nbpages) {
pdfdocument.meta meta = pdfview.getdocumentmeta();
printbookmarkstree(pdfview.gettableofcontents(), "-");
}
public void printbookmarkstree(list<pdfdocument.bookmark> 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