I have this webview code and I want to make it possible to have the PDF files opened when a user clicks on a PDF link. Here is the code, can you tell me what I have to put inside the PDF area of this? I've tried many different ways and I cannot get the PDF to view at all. Thanks for the help.
webview.setWebViewClient ( new WebViewClient() {
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// do your handling codes here, which url is the requested url
// probably you need to open that url rather than redirect:
if (url.startsWith("tel:")) {
startActivity(new Intent(Intent.ACTION_DIAL, Uri.parse(url)));
} else if (url.startsWith("mailto:")) {
url = url.replaceFirst("mailto:", "");
url = url.trim();
Intent i = new Intent(Intent.ACTION_SEND);
i.setType("plain/text").putExtra(Intent.EXTRA_EMAIL,
new String[]{url});
startActivity(i);
} else if (url.startsWith("geo:")) {
try {
} catch (Exception e) {
System.out.println(e);
}
} else if (url.endsWith("pdf")) {
try {
} catch (Exception e) {
System.out.println(e);
}
} else {
view.loadUrl(url);
}
return true;
// then it is not handled by default action
}
});
This could be as simple as:
try
{
Intent intentUrl = new Intent(Intent.ACTION_VIEW);
intentUrl.setDataAndType(url, "application/pdf");
intentUrl.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
myActivity.startActivity(intentUrl);
}
catch (ActivityNotFoundException e)
{
Toast.makeText(myActivity, "No PDF Viewer Installed", Toast.LENGTH_LONG).show();
}
though I've not tried this.
In our apps, we DOWNLOAD the PDF to the apps file system, make it world readable, then pass the path in an Intent to open a PDF viewing app (e.g. Acrobat Reader). Please note that you'd also need to also be concerned with cleaning up these downloaded PDF's!
in your try block put
new DownloadPDFTask().execute(url);
DownloadPDFTask class:
public class DownloadPDFTask extends AsyncTask<String, Void, Integer>
{
protected ProgressDialog mWorkingDialog; // progress dialog
protected String mFileName; // downloaded file
protected String mError; // for errors
@Override
protected Integer doInBackground(String... urls)
{
try
{
byte[] dataBuffer = new byte[4096];
int nRead = 0;
// set local filename to last part of URL
String[] strURLParts = urls[0].split("/");
if (strURLParts.length > 0)
mFileName = strURLParts[strURLParts.length - 1];
else
mFileName = "REPORT.pdf";
// download URL and store to strFileName
// connection to url
java.net.URL urlReport = new java.net.URL(urls[0]);
URLConnection urlConn = urlReport.openConnection();
InputStream streamInput = urlConn.getInputStream();
BufferedInputStream bufferedStreamInput = new BufferedInputStream(streamInput);
FileOutputStream outputStream = myActivity.openFileOutput(mFileName,Context.MODE_WORLD_READABLE); // must be world readable so external Intent can open!
while ((nRead = bufferedStreamInput.read(dataBuffer)) > 0)
outputStream.write(dataBuffer, 0, nRead);
streamInput.close();
outputStream.close();
}
catch (Exception e)
{
Log.e("myApp", e.getMessage());
mError = e.getMessage();
return (1);
}
return (0);
}
//-------------------------------------------------------------------------
// PreExecute - UI thread setup
//-------------------------------------------------------------------------
@Override
protected void onPreExecute()
{
// show "Downloading, Please Wait" dialog
mWorkingDialog = ProgressDialog.show(myActivity, "", "Downloading PDF Document, Please Wait...", true);
return;
}
//-------------------------------------------------------------------------
// PostExecute - UI thread finish
//-------------------------------------------------------------------------
@Override
protected void onPostExecute (Integer result)
{
if (mWorkingDialog != null)
{
mWorkingDialog.dismiss();
mWorkingDialog = null;
}
switch (result)
{
case 0: // a URL
// Intent to view download PDF
Uri uri = Uri.fromFile(myActivity.getFileStreamPath(mFileName));
try
{
Intent intentUrl = new Intent(Intent.ACTION_VIEW);
intentUrl.setDataAndType(uri, "application/pdf");
intentUrl.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
myActivity.startActivity(intentUrl);
}
catch (ActivityNotFoundException e)
{
Toast.makeText(myActivity, "No PDF Viewer Installed", Toast.LENGTH_LONG).show();
}
break;
case 1: // Error
Toast.makeText(myActivity, mError, Toast.LENGTH_LONG).show();
break;
}
}
}
any reference to "myActivity" must be replaced with a reference to your Activity class
Please checkout the example for handling redirect urls and open PDF without download, in webview.
private void init()
{
WebView webview = (WebView) findViewById(R.id.webview);
WebSettings settings = webview.getSettings();
settings.setJavaScriptEnabled(true);
webview.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
PdfWebViewClient pdfWebViewClient = new PdfWebViewClient(this, webview);
pdfWebViewClient.loadPdfUrl(
"https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwjgwIfp3KXSAhXrhFQKHQqEDHYQFggZMAA&url=http%3A%2F%2Fwww.orimi.com%2Fpdf-test.pdf&usg=AFQjCNERYYcSfMLS5ukBcT2Qy11YxEhXqw&cad=rja");
}
private class PdfWebViewClient extends WebViewClient
{
private static final String TAG = "PdfWebViewClient";
private static final String PDF_EXTENSION = ".pdf";
private static final String PDF_VIEWER_URL = "http://docs.google.com/gview?embedded=true&url=";
private Context mContext;
private WebView mWebView;
private ProgressDialog mProgressDialog;
private boolean isLoadingPdfUrl;
public PdfWebViewClient(Context context, WebView webView)
{
mContext = context;
mWebView = webView;
mWebView.setWebViewClient(this);
}
public void loadPdfUrl(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 (!isLoadingPdfUrl && isPdfUrl(url))
{
mWebView.stopLoading();
final String pdfUrl = PDF_VIEWER_URL + url;
new Handler().postDelayed(new Runnable()
{
@Override
public void run()
{
loadPdfUrl(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;
}
}
I was trying to handle this exact same scenario. The solution I came up with is below.
public boolean shouldOverrideUrlLoading(WebView view, String url) {
String cleanUrl = url;
if (url.contains("?")) {
// remove the query string
cleanUrl = url.substring(0,url.indexOf("?"));
}
if (cleanUrl.endsWith("pdf")) {
try {
Uri uriUrl = Uri.parse(cleanUrl);
Intent intentUrl = new Intent(Intent.ACTION_VIEW, uriUrl);
startActivity(intentUrl);
return true;
} catch (Exception e) {
System.out.println(e);
Toast.makeText(context,"No PDF Viewer Installed", Toast.LENGTH_LONG).show();
}
}
return false;
}
I needed to make sure it would handle pdf links, even if there was a query string. Still a bit hacky as the cleanUrl needs to end in "pdf", but so long as that is true, this should work. If you're serving up pdf's through a php script or something, you might want to dig a little deeper, handle things based on MIME type or something.
Loading pdf within a webview:
WebView wv = (WebView) view.findViewById(R.id.webPage);
wv.getSettings().setJavaScriptEnabled(true);
wv.setWebViewClient(new WebClient());
wv.loadUrl("http://drive.google.com/viewerng/viewer?embedded=true&url=" + mUrl);
wv.getSettings().setBuiltInZoomControls(true);
mUrl - will be your pdf link
FWIW, mozilla has a PDF-reader-entirely-in-JavaScript that's apache licensed. Might be worth looking into if you don't mind the extra size. That way you can do everything in-browser and won't have to rely on a 3rd party PDF reader.
来源：https://stackoverflow.com/questions/10520009/android-load-pdf-inside-webview