生活中的Design.

PDFViewer on Android

Android
字数统计: 620阅读时长: 2 min
2019/12/11 Share

Android中显示PDF

iOS的WebView能从线上url直接显示pdf,而Android的WebView不能直接显示,
Android的WebView要显示pdf需要拼接url到google的一个url显示,国内需要翻墙…所以这条路肯定走不通了

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urlWebView.loadUrl("http://docs.google.com/gview?embedded=true&url="  
                   + "YOUR_DOC_URL_HERE");

github上有一个控件形式的PDF显示器PDFView
https://github.com/barteksc/AndroidPdfViewer/issues
可以通过Uri / File / byte数组 /输入流 /DocumentSource 几个形式显示PDf到PDFView上
并且支持许多回调和自定义设置

可以用HttpURLConnection从url中获取流,再传入PdfView显示

  • 在xml中使用
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    <com.github.barteksc.pdfviewer.PDFView
            android:id="@+id/pdfView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"/>
  • 通过流读取pdf到View
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    url = new URL(url);
                urlConnection = (HttpURLConnection) url.openConnection();
                urlConnection.setConnectTimeout(30000);
                urlConnection.setReadTimeout(30000);
                urlConnection.setRequestMethod("GET");
                urlConnection.connect();
                if (urlConnection.getResponseCode() == 200) {
                    PDFView.Configurator configurator = vPdfView.fromStream(urlConnection.getInputStream())
                            .enableSwipe(true) // allows to block changing pages using swipe
                            .swipeHorizontal(false)
                            .enableDoubletap(true)
                            .defaultPage(0)
                            .onLoad(nbPages -> showLoading(false))
                            // allows to draw something on the current page, usually visible in the middle of the screen
                            .enableAnnotationRendering(false) // render annotations (such as comments, colors or forms)
                            .password(null)
                            .scrollHandle(null)
                            .enableAntialiasing(true) // improve rendering a little bit on low-res screens
                            // spacing between pages in dp. To define spacing color, set view background
                            .spacing(15)
                            .load();

注意把网络请求放在子线程中进行,PdfView的load()方法需要放在主线程中进行,否则没法显示pdf,

PDFView的Configurator设置

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.pages(0, 2, 1, 3, 3, 3) // 选择显示那些page
    .enableSwipe(true) // 是否允许滑动切换page
    .swipeHorizontal(false)//水平滑动
    .enableDoubletap(true)//双击放大
    .defaultPage(0)//默认显示page
    // allows to draw something on the current page, usually visible in the middle of the screen
    .onDraw(onDrawListener)//可以在onDraw中绘制自定义图形到当前页
    // allows to draw something on all pages, separately for every page. Called only for visible pages
    .onDrawAll(onDrawListener)//绘制自定义图形到所有页面
    .onLoad(onLoadCompleteListener) // 在加载完成后调用,调用后开始onRender
    .onPageChange(onPageChangeListener)//page切换监听
    .onPageScroll(onPageScrollListener)//page滚动监听
    .onError(onErrorListener)//错误时回调
    .onPageError(onPageErrorListener)//page加载错误
    .onRender(onRenderListener) // called after document is rendered for the first time 首次渲染后回调
    // called on single tap, return true if handled, false to toggle scroll handle visibility
    .onTap(onTapListener)//单击监听
    .enableAnnotationRendering(false) // render annotations (such as comments, colors or forms) 是否渲染注解:评论/颜色/forms
    .password(null)
    .scrollHandle(null)
    .enableAntialiasing(true) // improve rendering a little bit on low-res screens
    // spacing between pages in dp. To define spacing color, set view background
    .spacing(0) //page间隔
    .linkHandler(DefaultLinkHandler) //pdf中链接处理
    .pageFitPolicy(FitPolicy.WIDTH) //page适应策略,宽度优先还是高度优先 3.0.0才有
    .load()//加载pdf

注意处理与Activity生命周期相关比如缓存和数据清理

原文作者：Apm29

原文链接：https://apm29.github.io/2019/12/11/PDFViewerInAndroid/

发表日期：December 11th 2019, 9:11:20 pm

更新日期：December 18th 2019, 4:51:02 pm

版权声明：本文采用知识共享署名-非商业性使用 4.0 国际许可协议进行许可

CATALOG
  1. 1. Android中显示PDF
    1. 1.1. 可以用HttpURLConnection从url中获取流,再传入PdfView显示
    2. 1.2. PDFView的Configurator设置
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