前两天用到PDF加载功能，需求是从url加载，本以为很简单的事，只需一个webview就解决了，没想到webview不支持，网上找了一些解决方案都不太理想，于是想自己封装一个。

开源的库基本没有支持url加载的（或者我没找到），我的实现思路是先把文件下载下来，再从已加载本地file的形式加载出来，开源库选择

barteksc/AndroidPdfViewer

   public void loadFromUrl(){
            final String SDPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"/PDFViewCache/";
            int index = fileUrl.lastIndexOf("/");
            String fileName = fileUrl.substring(index);
            final File file = new File(SDPath, fileName);
            if(file.exists()){
                //文件存在
                if(onFileDownloadCompleteListener!=null){
                    onFileDownloadCompleteListener.onDownloadComplete(file);
                }
                PDFView.this.fromFile(file);
                load();
            }else{
                DownloadUtil.get().download(fileUrl, SDPath, new DownloadUtil.OnDownloadListener() {
                    @Override
                    public void onDownloadSuccess(File file) {
                        if(onFileDownloadCompleteListener!=null){
                            onFileDownloadCompleteListener.onDownloadComplete(file);
                        }
                        PDFView.this.fromFile(file);
                        load();
                    }

                    @Override
                    public void onDownloading(int progress) {

                    }

                    @Override
                    public void onDownloadFailed() {

                    }
                });
            }
        }

使用方法

Step 1. Add the JitPack repository to your build file

Add it in your root build.gradle at the end of repositories:

allprojects {
	repositories {
		...
		maven { url 'https://jitpack.io' }
	}
}

Step 2. Add the dependency

dependencies {
        compile 'com.github.shxdos:AndroidPdfViewer:2.7.0-beta.2'
}

pdfView.fromUrl("http://www.anweitong.com/upload/document/standard/national_standards/138793918364316200.pdf")
                        .enableSwipe(true) // allows to block changing pages using swipe
                        .defaultPage(0)
                        .onLoad(this) // called after document is loaded and starts to be rendered
                        .onPageChange(this)
                        .swipeHorizontal(false)
                        .enableAntialiasing(true)
                        .onFileDownload(this)
                        .loadFromUrl();

源码下载 http://download.csdn.net/detail/shaohongxuan/9908649