带有 PDF 加载的 Android webview

Question

我正在 webview 中加载一个页面

webView.getSettings().setJavaScriptEnabled(true);
webView.loadUrl("https://www.xxxxxxxxx/howtoguide.aspx");

然后在 webview 里面我有几个函数可以点击下面的事件

            @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {

            if (url.contains("concierge@xxxx.com.sg")) {
                final Intent eIntent = new Intent(
                        android.content.Intent.ACTION_SEND);
                eIntent.setType("plain/text");
                eIntent.putExtra(android.content.Intent.EXTRA_EMAIL,
                        new String[]{"xxxxxx"});
                eIntent.putExtra(android.content.Intent.EXTRA_SUBJECT,
                        "");
                eIntent.putExtra(android.content.Intent.EXTRA_TEXT,
                        "Text to be send");
                startActivity(Intent.createChooser(eIntent,
                        "Send mail..."));

            } else if (url.startsWith("tel:")) {

            Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
                startActivity(intent);
                view.reload();

            } else if (url.contains(".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
            //}
            // view.loadUrl("https://docs.google.com/viewer?url=" + url);
               view.loadUrl("http://drive.google.com/viewerng/viewer?embedded=true&url=" + url);               
            } else {
                view.loadUrl(url);
            }
            return true;
        }

在这个 webview 中有一个 PDF 的点击事件。因此，如果我单击此 PDF 将不会加载

Answer 1

view.loadUrl("http://drive.google.com/viewerng/viewer?embedded=true&url=" + url);

当我调用在 webview 中加载时，此方法调用对我有用。所以这个 webview 布局高度应该是 match_parent。

点击链接打开浏览器，然后像下面的代码一样简单地传递 URL。

 Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse(url));
                startActivity(intent);

这解决了我的问题。

Answer 2

表示使用这些方法需要登录谷歌。

其他方式使用pdf.js

您必须将pdf文件保存到sdcard并在webview中加载。

将 pdfjs 文件添加到您的资产目录

 else if (url.contains(".pdf"))
        {
           File file = new File(Environment.getExternalStorageDirectory() + "/test.pdf");

   view.loadUrl("file:///android_asset/pdfjs/web/viewer.html?file=" + file.getAbsolutePath() + "#zoom=page-width"); 
        }

Full sample project

Answer 3

请检查以下示例代码以满足您的要求

private void init()
{
    WebView webview = (WebView) findViewById(R.id.webview);
    WebSettings settings = webview.getSettings();
    settings.setJavaScriptEnabled(true);
    webview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);

    MyWebViewClient webViewClient = new MyWebViewClient(this, webview);
    webViewClient.loadUrl(YOUR_URL);
}

private class MyWebViewClient extends WebViewClient
{
    private static final String TAG = "MyWebViewClient";
    private static final String PDF_EXTENSION = ".pdf";
    private static final String PDF_VIEWER_URL = "https://drive.google.com/viewerng/viewer?embedded=true&url=";

    private Context mContext;
    private WebView mWebView;
    private ProgressDialog mProgressDialog;
    private boolean isLoadingPdfUrl;

    public MyWebViewClient(Context context, WebView webView)
    {
        mContext = context;
        mWebView = webView;
        mWebView.setWebViewClient(this);
    }

    public void loadUrl(String url)
    {
        mWebView.stopLoading();

        if (!TextUtils.isEmpty(url))
        {
            isLoadingPdfUrl = isPdfUrl(url);
            if (isLoadingPdfUrl)
            {
                mWebView.clearHistory();
            }

            showProgressDialog();
        }

        mWebView.loadUrl(url);
    }

    @SuppressWarnings("deprecation")
    @Override
    public boolean shouldOverrideUrlLoading(WebView webView, String url)
    {
        return shouldOverrideUrlLoading(url);
    }

    @SuppressWarnings("deprecation")
    @Override
    public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl)
    {
        handleError(errorCode, description.toString(), failingUrl);
    }

    @TargetApi(Build.VERSION_CODES.N)
    @Override
    public boolean shouldOverrideUrlLoading(WebView webView, WebResourceRequest request)
    {
        final Uri uri = request.getUrl();
        return shouldOverrideUrlLoading(webView, uri.toString());
    }

    @TargetApi(Build.VERSION_CODES.N)
    @Override
    public void onReceivedError(final WebView webView, final WebResourceRequest request, final WebResourceError error)
    {
        final Uri uri = request.getUrl();
        handleError(error.getErrorCode(), error.getDescription().toString(), uri.toString());
    }

    @Override
    public void onPageFinished(final WebView view, final String url)
    {
        Log.i(TAG, "Finished loading. URL : " + url);
        dismissProgressDialog();
    }

    private boolean shouldOverrideUrlLoading(final String url)
    {
        Log.i(TAG, "shouldOverrideUrlLoading() URL : " + url);

        if (url.contains("concierge@xxxx.com.sg"))
        {
            Intent eIntent = new Intent(android.content.Intent.ACTION_SEND);
            eIntent.setType("plain/text");
            eIntent.putExtra(android.content.Intent.EXTRA_EMAIL, new String[]{"xxxxxx"});
            eIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");
            eIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Text to be send");
            startActivity(Intent.createChooser(eIntent, "Send mail..."));
            return true;
        }
        else if (url.startsWith("tel:"))
        {
            Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));
            startActivity(intent);
            return true;
        }
        else if (!isLoadingPdfUrl && isPdfUrl(url))
        {
            mWebView.stopLoading();

            final String pdfUrl = PDF_VIEWER_URL + url;

            new Handler().postDelayed(new Runnable()
            {
                @Override
                public void run()
                {
                    loadUrl(pdfUrl);
                }
            }, 300);

            return true;
        }

        return false; // Load url in the webView itself
    }

    private void handleError(final int errorCode, final String description, final String failingUrl)
    {
        Log.e(TAG, "Error : " + errorCode + ", " + description + " URL : " + failingUrl);
    }

    private void showProgressDialog()
    {
        dismissProgressDialog();
        mProgressDialog = ProgressDialog.show(mContext, "", "Loading...");
    }

    private void dismissProgressDialog()
    {
        if (mProgressDialog != null && mProgressDialog.isShowing())
        {
            mProgressDialog.dismiss();
            mProgressDialog = null;
        }
    }

    private boolean isPdfUrl(String url)
    {
        if (!TextUtils.isEmpty(url))
        {
            url = url.trim();
            int lastIndex = url.toLowerCase().lastIndexOf(PDF_EXTENSION);
            if (lastIndex != -1)
            {
                return url.substring(lastIndex).equalsIgnoreCase(PDF_EXTENSION);
            }
        }
        return false;
    }
}

在 web 视图中查看用于处理重定向 url 和打开 PDF 而不下载的示例代码。 https://gist.github.com/ashishdas09/014a408f9f37504eb2608d98abf49500