Is it possible to have a chrome extension on android chrome? - android

I've been searching but all I can find is a reference to download another browser called yandex and install the chrome extensions I have on that.
I want to create an app that uses a chrome extension in android to allow the user to download images and store them in a folder.
E.g. My app: the user will search google images and each image that the user views, an icon will appear top right on the image which provides the user with a menu to download to a specific folder.
But the only extensions I've been able to download are for desktop.
Can I achieve what I want with my app?

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How to launch my downloader app when chrome encounters a download link on android?

I am making a download manager app. I need an activity (assume MainActivity) to popup when user is trying to download a file from his default browser (say chrome).
Basically I need to grab a download from chrome.
How to do this?

Create shortcut icon for locally stored web app for Firefox Android

I have created a local web app for Android that I want to use with Firefox. My problem is that I'm not able to get the desktop shortcut to have the app icon, and even on the tabs in FF, a white S on a green background is displayed (it's the same icon used for the shortcut).
Chrome is able to display the icon but due to various reasons (http vs https restrictions, inability to access external SD card storage, inability to create desktop shortcut for local web apps...) I have to use Firefox.
I have used the content generated with https://realfavicongenerator.net to no avail. Websites, though, do display their icons both in tabs and when a shortcut is created on the desktop, so FF is not broken on the device.
I have read through some of the questions here on SO (this and this) as well as the FAQ on realfavicongenerator.net but nothing points specifically to locally stored web apps and FF.

Use Google search by Image uploading an image from gallery

I'm trying to create an Android application to recognize an image by Google images search. I want that a user provides an image to Google (by uploading it from the gallery) and Google returns the web page with the best guess for the loaded image.
I would open the google images search page (https://www.google.it/imghp?hl=it&tab=wi&ei=ZzCGWIW9EcyuswHu7KroDA&ved=0EKouCBYoAQ) inside of my activity.
But, in this page, in order to see the camera icon next to the search bar that lets you upload images, you must set your browser with the "pc view".
So how can I open in my activity this page directly in "view PC" mode? In addition there is a way to directly execute the image search using Google image search without opening the associated page but through an http request?
I am also interested in different approaches to the problem.
Thanks in advance.
To open the page in PC mode, you could set the user agent to that of a desktop browser
webview.getSettings().setUserAgentString("DESKTOP_USERAGENT");
An alternative would be to send the image to Chrome and allow the user to perform the reverse image search using the built-in menu, but that is no longer a native solution.

Allow download of PDFs or Images from iOS or Android app

In my iOS app, I have PDFs shown in a webview that are hosted online. How can I allow users to download/save these PDFs to their devices from within the app?
I also want android users to be able to download the content, but the content is hosted as an image, because android's PDF viewing capabilities were not good. So what do I need to do to allow users to download an image from within the app (also in a webview)?

Android: downloading files through In-App-Purchase

I am developing an app in which user can browse through images. There is an upgrade button. When user clicks the upgrade button I want to download some more images on the device to browse.
Where should I put those extra images for user to download?
Can I put those images in Google Play itself, so that I don't have to access any server?
EDIT:
In ios we can add .pkg file and we can put images, database in this .pkg file. When the user will upgrade the app, this .pkg file will be available on his/her device and we can access it there.
Can we achieve something like this in Android?

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