Opera Mini for Java is a more compact version of the independent Opera web browser experience. The software is written in Java language which is platform agnostic with a Java runtime package available for numerous computing platforms. However, primarily Opera Mini is used on various mobile computing platforms that have limited memory or processor capacity and need a web browser that will run on an older mobile platform. This coupled with the fact that some older phones already run a Java-based operating system making them ideal recipients for the Opera Mini for Java software.
Over 250 million people now use Opera Mini instead of the full blown Opera web browser, Firefox, Chrome or other alternative browser. The lack of ad tracking whilst running in a similar fashion to Chrome makes Opera Mini a preferred choice for many who dislike the way Chrome tracks usage and Gmail usage, then changes display ads based on activity and interests of the user.
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The browser also focused on minimal use of screen real estate as many phones using Java have limited size screens. Web pages can be crunched down to load faster and display quicker. Enhanced button navigation to make navigating around web sites on a small screen easier. Share favorite pages easily with friends. Strong security and privacy for data.
Opera Mini for Java will not display the web sites using bleeding edge design technologies but it is perfectly adequate for older phones that want light web browsing served quickly and without too much overhead.
Opera Mini is a mobile web browser made by Opera. It was primarily designed for the Java ME platform, as a low-end sibling for Opera Mobile, but as of 2022[update] only the Android build was still under active development. It had previously been developed for iOS, Windows 10 Mobile, Windows Phone 8.1, BlackBerry, Symbian, and Bada.
Opera Mini requests web pages through Opera Software's compression proxy server. The compression server processes and compresses requested web pages before sending them to the mobile phone. The compression ratio is 90% and the transfer speed is increased by two to three times as a result. The pre-processing increases compatibility with web pages not designed for mobile phones. However, interactive sites which depend upon the device processing JavaScript do not work properly.
In July 2012, Opera Software reported that Opera Mini had 168.8 million users as of March 2012.[11] In February 2013, Opera reported 300 million unique Opera Mini active users and 150 billion page views served during that month. This represented an increase of 25 million users from September 2012.[12]
Opera Mini was derived from the Opera web browser for personal computers, which has been publicly available since 1996.[13] Opera Mini was originally intended for use on mobile phones not capable of running a conventional Web browser.[14] It was introduced on 10 August 2005, as a pilot project in cooperation with the Norwegian television station TV 2,[15] and only available to TV 2 customers. The beta version was made available in Sweden, Denmark, Norway, and Finland on 20 October 2005.[16] After the final version was launched in Germany on 10 November 2005,[17] and quietly released to all countries through the Opera Mini website in December, the browser was officially launched worldwide on 24 January 2006.[18]On 3 May 2006, Opera Mini 2.0 was released. It included new features such as the ability to download files, new custom skins, more search engine options on the built-in search bar, a speed dial option, new search engines, and improved navigation.[19]On 1 November 2006, Opera Mini 3 beta introduced secure browsing, RSS feeds, photo uploading and content folding.[20] Content folding works by folding long lists such as navigation bars into a single line that can be expanded as needed. A second beta was released on 22 November,[21] and on 28 November, the final version of Opera Mini 3 was released.[22]
On 7 November 2007, Opera Mini 4 was released. According to Johan Schn, technical lead of Opera Mini development, the entire code had been rewritten.[23] Opera Mini 4 includes the ability to view web pages similarly to a desktop based browser by introducing Overview and Zoom functions, and a landscape view setting. In Overview mode, the user can scroll a zoomed-out version of certain web pages.[24] Using a built-in pointer, the user can zoom into a portion of the page to provide a clearer view; this is similar to the functionality of Opera's Nintendo-based web browsers. This version also includes the ability to synchronise with Opera on a personal computer.[25][26]Prior to Opera Mini 4, the browser was offered in two editions: Opera Mini Advanced for high-memory MIDP 2 phones, and Opera Mini Basic for low-memory MIDP 1 phones.[27] Opera Mini 4 replaced Opera Mini Advanced.[28] Originally, Google was the default search engine on Opera Mini.[29] On 8 January 2007, Opera Software and Yahoo! announced a partnership to make Yahoo! search the default instead.[30] On 27 February 2008, Opera Software announced that Google would henceforth be the default search engine for Opera Mini and Opera Mobile.A version for the Android operating system was announced on 10 April 2008. Rather than port the code to Android, a wrapper was created to translate Java ME API calls to Android API calls.[31]
On 3 September 2014, Opera started taking registrations for the beta version of Opera Mini for Windows Phone.[38] The browser was released for Windows Phone on 9 September 2014, as a public beta,[39] the first Opera version for Microsoft's mobile platform since the discontinuation of Windows Mobile.
Most Opera Mini versions use only the server-based compression method, with maximal compression but some issues with interactive web apps. Opera Mini can operate in three compression modes: "mini" (or "extreme" on Android versions), "turbo" (or "high" on Android versions) and uncompressed.[5][40] The turbo and mini modes reduce the amount of data transferred, thereby also increasing speed on slower connections.[5]
The functionality of the Mini mode is somewhat different from a conventional Web browser, with the amount of data which has to be transferred much reduced, but with some loss to functionality. Unlike straightforward web browsers, Opera Mini fetches all content through a proxy server, renders it using the Presto layout engine,[5] and reformats web pages into a format more suitable for small screens.[41] A page is compressed, then delivered to the phone in an interpreted markup language called Opera Binary Markup Language (OBML) supported by Opera Mini.[42] According to Opera Software, the data compression makes transfers about two to three times faster[24] and uses less data, and the pre-processing improves the display of web pages not designed for small screens.[43] The turbo mode was added later, and is similar to Mini mode but bypasses compression for interactive functionality, at the expense of less extreme data compression. The turbo and uncompressed modes use the "WebView" on Android and the WebKit layout engine on iOS.[5]
The Java ME and Windows Phone versions only have access to the mini compression mode.[5] Other versions can switch between various modes, gaining functionality at the cost of lower or no compression.[44] Opera Software claims that Opera Mini reduced the amount of data transmitted up to 90% in the mini (extreme) mode; in turbo (high) mode, it reduced amount up to 60%, similar to Google Chrome's Reduced Data mode.[40][45][46]
When a user requests a Web page using Opera Mini, the request is sent, via the connectivity used by the device to access the Internet (typically mobile broadband or Wi-Fi), to a proxy server run by the Opera Software company, which retrieves, processes and compresses the full page, and sends the smaller processed page back to the client's device.
By default, Opera Mini opens one connection to the proxy servers, which it keeps open and re-uses as required. This improves transfer speed and enables the servers to quickly synchronize changes to bookmarks stored in Opera Mini server. [47]
From 16 March 2015, Opera Mini's extreme compression mode uses an upgraded version of the Presto layout engine that is included in Opera 12.[48] Consequently, Opera Mini supports most of the web standards supported in Opera 12. Presto's development has continued for Opera Mini and further support was added for HTML5 input types, CSS Flexbox model, CSS rem units and ECMAScript 5.[48] However, unlike the desktop edition of Opera, frames are flattened because of client limitations, and dotted or dashed borders are displayed as solid borders due to bandwidth and memory issues.[49] As Opera Mini reformats web pages, it does not pass the Acid2 standards compliance test.[50][51] Opera Mini supports bi-directional text and can correctly display right-to-left scripts such as Arabic and Hebrew in addition to languages written left-to-right. However, it will not display right-to-left text if the font size is set to small or very small.[23] Indic and Chinese scripts are supported only if an appropriate font is installed on the device as the default system font.
For devices with screens 128 pixels wide or smaller, the default rendering mode is Small-Screen Rendering (SSR). In this mode, the page is reformatted into a single vertical column so that it only needs to be scrolled vertically.[24] Long lists and navigation bars are automatically collapsed (hiding most of the list or bar) by a feature known as "content folding". A plus (+) sign is displayed next to the collapsed content; when clicked, it toggles content folding.[52] Web developers can turn on SSR on the desktop edition of Opera to see how their websites will be displayed on mobile editions of Opera.[53] In SSR mode images are scaled down to no more than 70% of the screen size in either direction.[49]
Opera Mini can send content in bitmap image form if a font required is not available on the device, which is useful for indic scripts. Hindi, Bengali and a few other non-Latin character sets are supported. 152ee80cbc
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