Java Android-在webview中加载PDF
我有这个webview代码，我想让用户点击PDF链接时打开PDF文件成为可能。这是代码，你能告诉我我必须把什么放在这个PDF区域吗？我尝试了许多不同的方法，但我根本无法查看PDF。谢谢你的帮助Java Android-在webview中加载PDF,java,android,pdf,webview,webviewclient,Java,Android,Pdf,Webview,Webviewclient,我有这个webview代码，我想让用户点击PDF链接时打开PDF文件成为可能。这是代码，你能告诉我我必须把什么放在这个PDF区域吗？我尝试了许多不同的方法，但我根本无法查看PDF。谢谢你的帮助 webview.setWebViewClient ( new WebViewClient() { public boolean shouldOverrideUrlLoading(WebView view, String url) { // do your handling code
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
}
});
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);
这可以简单到：
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();
}
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);
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);
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);
new DownloadPDFTask().execute(url);
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);
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;
}
}
}
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);
公共类下载PDFTASK扩展异步任务
{
受保护的ProgressDialog mWorkingDialog；//进度对话框
受保护的字符串mFileName；//下载的文件
受保护的字符串mError；//用于查找错误
@凌驾
受保护的整数doInBackground（字符串…URL）
{
尝试
{
字节[]数据缓冲=新字节[4096]；
int nRead=0；
//将本地文件名设置为URL的最后一部分
字符串[]strURLParts=URL[0]。拆分（“/”；
如果（strURLParts.length>0）
mFileName=strURLParts[strURLParts.length-1]；
其他的
mFileName=“REPORT.pdf”；
//下载URL并存储到strFileName
//连接到url
java.net.URL urlReport=新的java.net.URL（URL[0]）；
URLConnection urlConn=urlReport.openConnection（）；
InputStreamInput=urlConn.getInputStream（）；
BufferedInputStream bufferedStreamInput=新的BufferedInputStream（streamInput）；
FileOutputStream outputStream=myActivity.openFileOutput（mFileName，Context.MODE_WORLD_READABLE）；//必须是世界可读的，以便可以打开外部意图！
而（（nRead=bufferedStreamInput.read（dataBuffer））>0）
write（dataBuffer，0，nRead）；
streamInput.close（）；
outputStream.close（）；
}
捕获（例外e）
{
Log.e（“myApp”，e.getMessage（））；
mError=e.getMessage（）；
申报表（1）；
}
返回（0）；
}
//-------------------------------------------------------------------------
//预执行-UI线程设置
//-------------------------------------------------------------------------
@凌驾
受保护的void onPreExecute（）
{
//显示“正在下载，请稍候”对话框
mWorkingDialog=ProgressDialog.show（myActivity，“，“正在下载PDF文档，请稍候…”，true）；
返回；
}
//-------------------------------------------------------------------------
//PostExecute-UI线程完成
//-------------------------------------------------------------------------
@凌驾
受保护的void onPostExecute（整数结果）
{
if（mWorkingDialog！=null）
{
mWorkingDialog.Disclose（）；
mWorkingDialog=null；
}
开关（结果）
{
案例0://一个URL
//意图查看下载PDF
Uri=Uri.fromFile（myActivity.getFileStreamPath（mFileName））；
尝试
{
Intent intentur=新意图（Intent.ACTION\u视图）；
intentUrl.setDataAndType（uri，“application/pdf”）；
intentur.setFlags（Intent.FLAG\u ACTIVITY\u CLEAR\u TOP）；
myActivity.startActivity（强度）；
}
捕获（ActivityNotFounde异常）
{
Toast.makeText（myActivity，“未安装PDF查看器”，Toast.LENGTH_LONG.show（）；
}
打破
案例1://错误
Toast.makeText（myActivity，mError，Toast.LENGTH_LONG）.show（）；
打破
}
}
}
任何对“myActivity”的引用都必须替换为对活动类的引用我正试图处理完全相同的场景。我想出的解决办法如下
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;
}
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);
我需要确保它能够处理pdf链接，即使有查询字符串。尽管cleanUrl需要以“pdf”结尾，但还是有点黑客味，但只要这是真的，它就应该可以工作。如果您通过php脚本或其他方式提供pdf，您可能需要更深入地挖掘，根据MIME类型或其他方式处理问题。FWIW，mozilla有一个apache许可的。如果你不介意加码的话，也许值得一看。这样，您就可以在浏览器中执行所有操作，而不必依赖第三方PDF阅读器。在网络视图中加载PDF：
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-将成为您的pdf链接请在webview中查看处理重定向URL的示例，并在不下载的情况下打开pdf
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);
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;
}
}
是否可以只在webview中显示PDF文件而不运行异步下载任务？否，与iOS上的UIWebView不同，Android webview不显示PDF内容。您可以尝试直接调用intent（即，无AsyncDownloadTask），尽管无论发生什么情况，您都会离开活动。嗯，所以在android中，最好的方法是调用async来下载文件并保存它。您知道该进程是否可以自动找到文件名并在SD卡上另存为该名称吗？我在使用时总是指定名称。谢谢我会尝试将您的http://{file}.pdf url传递给intent，我认为pdf查看器程序（例如Acrobat）会处理其余的内容。如果没有，下载任务应该给你一个好的起点。这部分代码处理文件命名，它从URL://将本地文件名设置为URL字符串[]strURLParts=URL[0]的最后一部分提取文件名。拆分（“/”；如果（strURLParts.length>0）mFileName=strURLParts[strURLParts.length-1]；else mFileName=“REPORT.pdf”；