Android 如何将 pdf 文档显示到 Webview 中？
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How can I display a pdf document into a Webview?
提问by shriya
I want to display pdf contents on webview. Here is my code:
我想在 webview 上显示 pdf 内容。这是我的代码：
WebView webview = new WebView(this);
setContentView(webview);
webview.getSettings().setJavaScriptEnabled(true);
webview.loadUrl("http://www.adobe.com/devnet/acrobat/pdfs/pdf_open_parameters.pdf");
I am getting a blank screen. I have set internet permission also.
我得到一个空白屏幕。我也设置了互联网权限。
回答by anticafe
You can use Google PDF Viewer to read your pdf online:
您可以使用 Google PDF Viewer 在线阅读您的 pdf：
WebView webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
String pdf = "http://www.adobe.com/devnet/acrobat/pdfs/pdf_open_parameters.pdf";
webview.loadUrl("https://drive.google.com/viewerng/viewer?embedded=true&url=" + pdf);
回答by slott
If you use the view only url the user is not propted to login to there google account.
如果您使用仅查看 url，则用户不会登录到那里的 google 帐户。
https://docs.google.com/viewer?url=http://my.domain.com/yourPdfUrlHere.pdf
回答by JDenais
Opening a pdf using google docs is a bad idea in terms of user experience. It is really slow and unresponsive.
就用户体验而言，使用 google docs 打开 pdf 是一个坏主意。它真的很慢而且反应迟钝。
Solution after API 21
API 21 之后的解决方案
Since api 21, we have PdfRendererwhich helps converting a pdf to Bitmap. I've never used it but is seems easy enough.
从 api 21 开始，我们有了PdfRenderer，它可以帮助将 pdf 转换为位图。我从未使用过它，但似乎很容易。
Solution for any api level
任何api级别的解决方案
Other solution is to download the PDF and pass it via Intent to a dedicated PDF app which will do a banger job displaying it. Fast and nice user experience, especially if this feature is not central in your app.
其他解决方案是下载 PDF 并通过 Intent 将其传递给专用的 PDF 应用程序，该应用程序将显示它。快速和良好的用户体验，特别是如果此功能不是您的应用程序的核心。
Use this code to download and open the PDF
使用此代码下载并打开 PDF
public class PdfOpenHelper {
public static void openPdfFromUrl(final String pdfUrl, final Activity activity){
Observable.fromCallable(new Callable<File>() {
@Override
public File call() throws Exception {
try{
URL url = new URL(pdfUrl);
URLConnection connection = url.openConnection();
connection.connect();
// download the file
InputStream input = new BufferedInputStream(connection.getInputStream());
File dir = new File(activity.getFilesDir(), "/shared_pdf");
dir.mkdir();
File file = new File(dir, "temp.pdf");
OutputStream output = new FileOutputStream(file);
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
total += count;
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
return file;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<File>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(File file) {
String authority = activity.getApplicationContext().getPackageName() + ".fileprovider";
Uri uriToFile = FileProvider.getUriForFile(activity, authority, file);
Intent shareIntent = new Intent(Intent.ACTION_VIEW);
shareIntent.setDataAndType(uriToFile, "application/pdf");
shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
if (shareIntent.resolveActivity(activity.getPackageManager()) != null) {
activity.startActivity(shareIntent);
}
}
});
}
}
}
For the Intent to work, you need to create a FileProviderto grant permission to the receiving app to open the file.
为了使 Intent 工作，您需要创建一个FileProvider来授予接收应用程序打开文件的权限。
Here is how you implement it: In your Manifest:
以下是您的实现方式： 在您的清单中：
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
Finally create a file_paths.xml file in the resources foler
最后在资源文件夹中创建一个file_paths.xml文件
<?xml version="1.0" encoding="utf-8"?>
<paths>
<files-path name="shared_pdf" path="shared_pdf"/>
</paths>
Hope this helps =)
希望这会有所帮助 =)
回答by Athira
Use this code:
使用此代码：
private void pdfOpen(String fileUrl){
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setPluginState(WebSettings.PluginState.ON);
//---you need this to prevent the webview from
// launching another browser when a url
// redirection occurs---
webView.setWebViewClient(new Callback());
webView.loadUrl(
"http://docs.google.com/gview?embedded=true&url=" + fileUrl);
}
private class Callback extends WebViewClient {
@Override
public boolean shouldOverrideUrlLoading(
WebView view, String url) {
return (false);
}
}
回答by Naveen Kumar M
Here load with progressDialog. Need to give WebClient otherwise it force to open in browser:
这里加载progressDialog。需要给 WebClient 否则它会强制在浏览器中打开：
final ProgressDialog pDialog = new ProgressDialog(context);
pDialog.setTitle(context.getString(R.string.app_name));
pDialog.setMessage("Loading...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
WebView webView = (WebView) rootView.findViewById(R.id.web_view);
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
pDialog.show();
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
pDialog.dismiss();
}
});
String pdf = "http://www.adobe.com/devnet/acrobat/pdfs/pdf_open_parameters.pdf";
webView.loadUrl("https://drive.google.com/viewerng/viewer?embedded=true&url=" + pdf);
回答by Paulo Fidalgo
回答by Dion
Actually all of the solutions were pretty complex, and I found a really simple solution (I'm not sure if it is available for all sdk versions). It will open the pdf document in a preview window where the user is able to view and save/share the document:
实际上所有的解决方案都非常复杂，我找到了一个非常简单的解决方案（我不确定它是否适用于所有 sdk 版本）。它将在预览窗口中打开 pdf 文档，用户可以在其中查看和保存/共享文档：
webView.setDownloadListener(DownloadListener { url, userAgent, contentDisposition, mimetype, contentLength ->
val i = Intent(Intent.ACTION_QUICK_VIEW)
i.data = Uri.parse(url)
if (i.resolveActivity(getPackageManager()) != null) {
startActivity(i)
} else {
val i2 = Intent(Intent.ACTION_VIEW)
i2.data = Uri.parse(url)
startActivity(i2)
}
})
(Kotlin)
（科特林）
回答by jaigish
String webviewurl = "http://test.com/testing.pdf";
webView.getSettings().setJavaScriptEnabled(true);
if(webviewurl.contains(".pdf")){
webviewurl = "http://docs.google.com/gview?embedded=true&url=" + webviewurl; }
webview.loadUrl(webviewurl);
回答by Mightian
This is the actual usage limitthat google allows before you get the error mentioned in the comments, if it's a once in a lifetime pdf that the user will open in app then i feel its completely safe. Although it is advised to to follow the the native approach using the built in framework in Android from Android 5.0 / Lollipop, it's called PDFRenderer.
这是在您收到评论中提到的错误之前谷歌允许的实际使用限制，如果用户将在应用程序中打开一生一次的pdf，那么我觉得它是完全安全的。尽管建议使用 Android 5.0 / Lollipop 中的 Android 内置框架遵循本机方法，但它称为PDFRenderer。
回答by Deepshikha Puri
Download source code from here (Open pdf in webview android)
从这里下载源代码（在 webview android 中打开 pdf）
activity_main.xml
活动_main.xml
<RelativeLayout android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<WebView
android:layout_width="match_parent"
android:background="#ffffff"
android:layout_height="match_parent"
android:id="@+id/webview"></WebView>
</RelativeLayout>
MainActivity.java
主活动.java
package com.pdfwebview;
import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
WebView webview;
ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
listener();
}
private void init() {
webview = (WebView) findViewById(R.id.webview);
webview.getSettings().setJavaScriptEnabled(true);
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setTitle("PDF");
pDialog.setMessage("Loading...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
webview.loadUrl("https://drive.google.com/file/d/0B534aayZ5j7Yc3RhcnRlcl9maWxl/view");
}
private void listener() {
webview.setWebViewClient(new WebViewClient() {
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
pDialog.show();
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
pDialog.dismiss();
}
});
}
}
