webview不会在链接点击时加载pdf文件

Question

我开发了一个Web应用程序,显示Web服务器上托管的pdf文档列表.这个应用程序嵌入在Android的webview应用程序中,但是当我在手机上加载应用程序时,选择pdf链接什么都不做.我究竟做错了什么？谢谢

继承人的java代码:

package com.hellowebview;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class HellowebviewActivity extends Activity {
/** Called when the activity is first created. */

private WebView mWebView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mWebView = (WebView) findViewById(R.id.webview);
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.loadUrl("http://aipnz.webs.com");
    mWebView.setWebViewClient(new HelloWebViewClient());
    mWebView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);

}
private class HelloWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView webview, String url)
    {
        webview.loadUrl(url);
        return true;
    }
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
    if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack())
    {
        mWebView.goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}
}

Answer 1

如果您要加载pdf,可以使用Google文档加载它.

String googleDocs = "https://docs.google.com/viewer?url=";
String pdf_url = "http://kronox.org/documentacion/Hello.Android.new.pdf";  

webView.loadUrl(googleDocs + pdf_url);

注意:您在清单文件中需要android.permission.INTERNET

Answer 2

只需在shouldOverrideUrlLoading方法中创建一个Intent:

    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if ( urlIsPDF(url)){
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.parse(url), "application/pdf");
            try{
                view.getContext().startActivity(intent);
            } catch (ActivityNotFoundException e) {
                //user does not have a pdf viewer installed
            }
        } else {
            webview.loadUrl(url);
        }
        return true;
    }

然后,只要用户单击webview中页面中的PDF链接,该文件就会在外部PDF应用程序中打开.

Answer 3

这是我使用的解决方案:

@Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if (url.endsWith(".pdf")){
            String pdfUrl = googleDocs + url;
            view.loadUrl(pdfUrl);
        } else {
            view.loadUrl(url);
        }
        return true;
    }

同

private final String googleDocs = "https://docs.google.com/viewer?url=";

Answer 4

您必须覆盖WebClient 中的shouldOverrideUrlLoading方法。我将这种方法与 Intent 和 Google Docs 结合使用作为备份：

/* You might want to move this string definition somewhere else */
final String googleDocs = "https://docs.google.com/viewer?url=";

WebView webView = new WebView(getContext());
//webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient() {
    @Override
    public boolean shouldOverrideUrlLoading(WebView webView, String url) {
        if (url.endsWith(".pdf")) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.parse(url), "application/pdf");
            /* Check if there is any application capable to process PDF file. */
            if (intent.resolveActivity(getPackageManager()) != null) {
                startActivity(intent);
            } else {
                /* If not, show PDF in Google Docs instead. */
                view.loadUrl(googleDocs + url);
            }
        } else {
            webView.loadUrl(url);
        }
        return true;
    }
});

您可能需要更改传递上下文和访问startActivity方法，但除此之外，它应该按原样运行。

另请注意，自 API 24 起，shouldOverrideUrlLoading您可以覆盖2种方法。正如@CommonsWare在此处所述，可以覆盖已弃用的方法。

Answer 5

webView.setWebViewClient(new WebViewClient() {
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        if (url.endsWith(".pdf")) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.setDataAndType(Uri.parse(url), "application/pdf");
            try {
                view.getContext().startActivity(intent);
            } catch (ActivityNotFoundException e) {
                //user does not have a pdf viewer installed
            }
        } else {
            webView.loadUrl(url);
        }

        return true;
    }
}