android原生打開pdf檔案方法有多種,但都不是很友善的樣子,經過比較個人選用通過pdf.js這種方法來打開pdf檔案
直接上代碼
1.在src/main檔案夾下面建立assest檔案夾
建立pdf.html檔案和pdf.js檔案
<!DOCTYPE html>
<html >
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width,initial-scale=1.0,maximum-scale=2.0,user-scalable=yes"/>
<title>Document</title>
<style type="text/css">
canvas {
width: 100%;
height: 100%;
border: 1px solid black;
}
</style>
<script src="https://unpkg.com/[email protected]/build/pdf.min.js"></script>
<script type="text/javascript" src="pdf.js"></script>
</head>
<body>
</body>
</html>
上面為pdf.html内容,下面為pdf.js内容
var url = location.search.substring(1);
pdfjsLib.cMapUrl = 'https://unpkg.com/[email protected]/cmaps/';
pdfjsLib.cMapPacked = true;
var pdfDoc = null;
function createPage() {
var div = document.createElement("canvas");
document.body.appendChild(div);
return div;
}
function renderPage(num) {
pdfDoc.getPage(num).then(function (page) {
var viewport = page.getViewport({scale:2.0});
var canvas = createPage();
var ctx = canvas.getContext('2d');
canvas.height = viewport.height;
canvas.width = viewport.width;
page.render({
canvasContext: ctx,
viewport: viewport
});
});
}
pdfjsLib.getDocument(url).then(function (pdf) {
pdfDoc = pdf;
for (var i = 1; i <= pdfDoc.numPages; i++) {
renderPage(i)
}
});
2.在activity 通過webview控件來加載,需要設定支援相應功能
webview需設定
WebView mWebView = (WebView) findViewById(R.id.web_view);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setAllowFileAccessFromFileURLs(true);
webSettings.setAllowUniversalAccessFromFileURLs(true);
webSettings.setSupportZoom(true);
webSettings.setBuiltInZoomControls(true);
webSettings.setDisplayZoomControls(true); 3.webview加載本地pdf檔案
//打開assets檔案下的pdf檔案
//mWebView.loadUrl("file:///android_asset/xxx.pdf");
//打開網絡下載下傳儲存在本地的pdf檔案,filePath儲存在緩存檔案下的格式 /data/user/0/xxx/cache/xxx.pdf
mWebView.loadUrl("file:///android_asset/pdf.html?" + filePath);
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