My project is a web based app and loaded by android webview.
I want to call camera by clicking one button on my web page, then catch image back and set back into web page.
Currently I use MediaStore.ACTION_IMAGE_CAPTURE to catch a picture by camera. And then convert the image to base64 string (myImgStr). These steps are fine.
But when I use webview.LoadUrl("javascript:handleCameraResult('+ myImgStr +')") to send image string back into web page, there is null in web page.
Do you guys know what the issue is and how to fix it?
Thanks!
Finally I've got the answer. That is:
Base64 string received by MediaStore.ACTION_IMAGE_CAPTURE contains some "\n" which block the entire string inserted through javascript call.
My solution is to remove those "\n" then call wevview.LoadUrl. Everything works well now.
Related
Case: User should be able to view and print pdf
My solution: I am opening PDF inside Webview with the help of docs.google.com/gview. Below is my code
Set up Webview
string url = "http://www.africau.edu/images/default/sample.pdf";
string gview = $"https://docs.google.com/gview?embedded=true&url={url}";
mWebView.LoadUrl(gview);
Print PDF
var printMgr = (PrintManager)GetSystemService(PrintService);
printMgr.Print("print", mWebView.CreatePrintDocumentAdapter("print"), null);
Below is the screenshot. As you can see PDF loads just fine
Problem
When I want to print PDF, all the PDF pages are printed in one paper which you can see below
I would appreciate any suggestion, including different library for displaying/printing pdf or suggestion in Java or Kotlin, I can convert them to C#.
I would not print the web page but print the PDF directly as when printing the web page it just sees it as a longer web page and knows nothing about the content.
Use a custom print adapter instead, but instead of drawing a PDF to print you can just use the existing PDF you already have.
See for details https://developer.android.com/training/printing/custom-docs.html
Hi i have data that contains HTML image tag and some text. To display this content i am using webView by following approach:
String getProductDetailsTechSpec = "<img src="http://myhost.com/myimages/image.jpg"/></br>Here is the content of my article. Yada Yada. Etc. Etc."
getProductDetailsTechSpec.loadDataWithBaseURL("", getTechSpec,
"text/html", "UTF-8", "");
when device is connected to the wi-fi or mobile data, image is displying properly and when user turn off the wi-fi/Mobile data after some time image does not displaying(it works for few mins because webview get cached the image but after some time it doesn't) . But text is still is working. Please give me suggestion hot to get rid of this problem.
Thanks in advance.
The text is working because simply the webview is able to draw the HTML tags that you're writing even if there is no internet connection .. just like if your write that HTML to a text file and run in with the browser in your computer ..
But for the image the webview displays it from a URL which needs connection to display it
if your're looking for a way to cache the image , you might wanna check out that link
It's weird, but till yesterday i was able to get the gplus user's image in my app but today it's just not coming. Nothing simply blank. And just appears at some time..
I have been using the urls specified in Getting Google+ profile picture url with user_id but these all seem invalid and gives 404 Error.
https://plus.google.com/s2/photos/profile/116018066779980863044?sz=100
If anybody could help me out why this weird behaviour. The Profile pic appears seldom. But mostly it's blank.
The image URL you were using was never a public API and so there was no guarantee it would continue to work. The recommended practice going forward is to use the people.get API method to get the profile => image => url value instead. That URL could stop working if the user changes their avatar so you might want to fetch the actual image and cache it on your own servers.
I think the Image url has been updated.
Inorder to get that, we can use the PlusClient objects methods:
imageURL = mPlusClient.getCurrentPerson().getImage().getUrl()
{Returns a String - Image Url as String}
imageURL = mPlusClient.getCurrentPerson().getImage()
{Returns an instance of Image object}
I used graph API Json Response of Facebook Wall Post Images and display in my APP i successfully got it. But the wall images look very Blur how to resolve? i used this code for get wall picture
URL url=new URL(hashMap.get("picture_url"));
bitmap=BitmapFactory.decodeStream(url.openConnection().getInputStream());
((ImageView)view.findViewById(R.id.imageView_FullImage)).setImageBitmap(bitmap)
The Facebook Graph API as well as the FQL data set always returns the Picture URL of a thumbnail. If you look at the URL it returns, it will have one of these ending (right before the image extension .jpg, .png, etc) _t., _a.. For example, if the URL is to a JPG file, it could have an ending _t.jpg
The idea is to swap the ending and choose a normal size for the image that is returned. To do this, use the code below that will replace the endings with the one for normal sized images (that should have the _n.)
By the way, I don't think the tag you are looking for is picture_url. It should be just picture. But regardless, get the source URL as shown below, replace the endings and then pass it to the this line in your code:
// THIS SHOULD BE AFTER THE if....else code block
bitmap=BitmapFactory.decodeStream(url.openConnection().getInputStream());
CODE TO REPLACE THE VARIOUS THUMBNAIL IMAGES: By the way, this is production code and works perfect.
String PICTURE_URL;
String getPicture = JOFeeds.getString("picture");
if (getPicture.contains("_t.")) {
PICTURE_URL = getPicture.replaceAll("_t.", "_n.");
} else if (getPicture.contains("_a.")) {
PICTURE_URL = getPicture.replaceAll("_a.", "_n.");
} else if (getPicture.contains("_s.")) {
PICTURE_URL = getPicture.replaceAll("_s.", "_n.");
} else if (getPicture.contains("_q.")) {
PICTURE_URL = getPicture.replaceAll("_q.", "_n.");
}
Note: However, in some cases, like a Video preview or a Link preview, it will not always have a bigger image available. Nothing much you can do about it nor can Facebook I suspect. These typically come from posts that are shared by users from other websites.
Is there a way to download just the icons that are stored in a particular application from Google Play/Market without downloading the entire APK and installing it?
You can do this but it would require downloading he page source and then parsing it.
What you could do is first download the webpage, i like JSoup. Like
Document d = null;
try {
d = Jsoup.connect("https://play.google.com/store/apps/details?id=" + packageName).get();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
Then you should parse that document for the following tag ""
Elements div = d.getElementsByAttributeValueContaining("class", "doc-banner-icon");
String path = div.get(0).attr("src");
This path variable should be the path for the image to download. I have not tested this.
Nope
There is no official API for market content. Be it to retrieve icons or anything else.
If you are just interested in getting the image files you can download them manually via the web front end to the Market. But I wouldn't write code to do this, as it is very likely that they will make a change to the web front end that will result in your code breaking. p.s. I am no lawyer, but also I don't think there is very much that you would be "allowed" to do with these images even if you did download them (without permission from each developer of course)
The answer by Jug6ernaut will no longer work. This works as of November 2016:
#WorkerThread public static String scrapeGooglePlayIcon(#NonNull String packageName) throws IOException {
return Jsoup.connect("https://play.google.com/store/apps/details?id=" + packageName).get()
.select("div[class=details-info] > div[class=cover-container] > img[class=cover-image]")
.attr("abs:src");
}
I created a small library that web scrapes the Google Play store. If this stops working in the future, please comment or create an issue on the GitHub project: https://github.com/jaredrummler/GooglePlayScraper
You could create a Yahoo Pipes like this http://kcy.me/hylg it will parse the page for you and extract a JSON in wich you could read the sinlge image URL.
http://kcy.me/hylj
You can parameterize the pipe in order to receive the link to the app you want to extract the image.
The simple solution is that just right click on the icon of the app from Chrom browser and save image as, this will save the icon with webp extension, now use this Conver webp to png
to convert the icon to PNG.