Java for Mobile Devices is a set of technologies that let developers deliver applications and services to all types of mobile handsets, ranging from price efficient feature-phones to the latest smartphones.

The easiest way to add phone number sign-in to your app is to useFirebaseUI,which includes a drop-in sign-in widget that implements sign-in flows for phonenumber sign-in, as well as password-based and federated sign-in. This documentdescribes how to implement a phone number sign-in flow using the Firebase SDK.

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Authentication using only a phone number, while convenient, is less securethan the other available methods, because possession of a phone numbercan be easily transferred between users. Also, on devices with multiple userprofiles, any user that can receive SMS messages can sign in to an account usingthe device's phone number.

Firebase's phone number sign-in request quota is high enough that most appswon't be affected. However, if you need to sign in a very high volume of userswith phone authentication, you might need to upgrade your pricing plan. Seethe pricing page.

To initiate phone number sign-in, present the user an interface that promptsthem to type their phone number. Legal requirements vary, but as a best practiceand to set expectations for your users, you should inform them that if they usephone sign-in, they might receive an SMS message for verification and standardrates apply.

You can use this behavior to resume the phone number sign in process if yourapp closes before the user can sign in (for example, while the user is usingtheir SMS app). After you call verifyPhoneNumber, set a flag thatindicates verification is in progress. Then, save the flag in your Activity'sonSaveInstanceState method and restore the flag inonRestoreInstanceState. Finally, in your Activity'sonStart method, check if verification is already in progress, andif so, call verifyPhoneNumber again. Be sure to clear the flag whenverification completes or fails (see Verification callbacks).

This method is called in two situations:  Instant verification: in some cases the phone number can be instantly verified without needing to send or enter a verification code. Auto-retrieval: on some devices, Google Play services can automatically detect the incoming verification SMS and perform verification without user action. (This capability might be unavailable with some carriers.) This uses the SMS Retriever API, which includes an 11 character hash at the end of the SMS message.  In either case, the user's phone number has been verified successfully, and you can use the PhoneAuthCredential object that's passed to the callback to sign in the user.

After the user enters the verification code that Firebase sent to the user'sphone, create a PhoneAuthCredential object, using the verificationcode and the verification ID that was passed to the onCodeSent oronCodeAutoRetrievalTimeOut callback. (WhenonVerificationCompleted is called, you get aPhoneAuthCredential object directly, so you can skip this step.)

You can directly start using a fictional phone number in your application. This allows you toperform manual testing during development stages without running into quota issues or throttling.You can also test directly from an iOS simulator or Android emulator without Google Play Servicesinstalled.

On sign-in completion, a Firebase user is created with that phone number. Theuser has the same behavior and properties as a real phone number user, and can access Realtime Database/Cloud Firestore and other services the same way. The ID token minted during this process has the same signature as a real phone number user.

In addition to manual testing, Firebase Authentication provides APIs to help write integration testsfor phone auth testing. These APIs disable app verification by disabling the reCAPTCHArequirement in web and silent push notifications in iOS. This makes automation testing possible inthese flows and easier to implement. In addition, they help provide the ability to test instantverification flows on Android.

On Android, call setAppVerificationDisabledForTesting() before the signInWithPhoneNumber call. This disables app verification automatically,allowing you to pass the phone number without manually solving it. Even thoughPlay Integrity and reCAPTCHA are disabled, using a real phone number will still fail tocomplete sign in. Only fictional phone numbers can be used with this API.

It's well known that Google's original plan for Android shifted gears dramatically once Apple unveiled its own iPhone in early 2007. However, the documents exposed in court show how great that shift was and how little Google originally planned to disrupt the status quo in mobile phones.

Google acquired an existing Android project in 2005, which was essentially an offshoot of Danger, the Java platform powering TMobile's SideKick slider phone. Both Danger and Android were founded by former Apple employee Andy Rubin.

Beyond the required physical keyboard identical to Windows Mobile phones of the period, Google also noted that "touch screens will not be supported. The product was designed with the presence of discrete physical buttons as an assumption. However, there is nothing fundamental in the Product's architecture that prevents the support of touchscreens in the future."

Google planned to essentially use existing reference designs for Windows Mobile Smartphone hardware and install Android as Sun's Java Mobile running on Linux. The 2006 definition flatly specifies "the Platform will be compatible with Java Platform, Micro Edition (Java ME)."

Other portions still "TK" in 2006 were multimedia frameworks, the handling of music and pictures, and any outline of how an Android phone might support email accounts, folders, attachments or rich text.

Jobs contrasted "regular cell phones," saying "they're not so smart, and they're not so easy to use. Smartphones are definitely a little smarter, but they actually are harder to use. They're really complicated. Just for the basic stuff people have a hard time figuring out how to use them. Well, we don't want to do either one of these things."

Instead, Jobs said, "what we want to do is make a leapfrog product that is way smarter than any mobile device has ever been, and super-easy to use. This is what iPhone is. So we're going to reinvent the phone."

Android's founder Rubin was similarly quoted as responding, "Holy crap, I guess we're not going to ship that phone," a reference to the BlackBerry-like Android phone prototype Google was gearing up to release. Instead, the company had to return to the drawing board and develop a new device with Windows Mobile hardware developer HTC, which became the HTC Dream, also branded as T-Mobile G1.

Rubin didn't just look to Jobs's iPhone unveiling for inspiration on the entire new application architecture and user interface of Android; it also colored everything about how the platform would work, from rich email to "real" web browsing. The "TK" web browser section was replaced with "The Platform will include a fully featured web browser based on the WebKit Open Source Project."Rubin didn't just take Apple's phone, he also took the touchscreen iPod and the breakthrough Internet device.

Google announced Android as a project that same month, but the HTC Dream/G1 wasn't launched until October 2008, a year later. When it was released, Android still lacked support for touchscreen typing by finger. And while the phone shipped with hardware support for multitouch, its software was patched to remove support for the feature. In late 2009, Google released Android 2.0, adding software support for multitouch.

If the iPhone hadn't come along, then many phones would still look like blackberry clones even to this day, including Google's phones. People wouldn't be playing Candy Crush on their way to work. People wouldn't be surfing the full web on their phones. Fandroids would be typing on their hardware phone keyboards and thinking that they're oh so cool and oh so advanced, using devices that are at the pinnacle of technological innovation, while they navigate around the screen using a damn cursor in 2014.

This is mainly an issue on certain Android smartphones, which are by default configured to disable JavaScript, but it can also happen with some third-party Android browsers.So how can you tell if JavaScript is enabled on an Android phone or tablet? Well, there is a handy way to do that. In this guide, we will walk you through basic JavaScript introduction and show you how to turn on or turn off JavaScript on an Android smartphone in no time.

JavaScript has become integral in modern web development as most applications that make the web indispensable for modern life are developed in some form of this robust code. So, if you have disabled JavaScript on your Android Smartphone and now wish to enable it, we are here to help.

Android is a mobile operating system based on a modified version of the Linux kernel and other open-source software, designed primarily for touchscreen mobile devices such as smartphones and tablets. Android is developed by a consortium of developers known as the Open Handset Alliance, though its most widely used version is primarily developed by Google. It was unveiled in November 2007, with the first commercial Android device, the HTC Dream, being launched in September 2008.

Over 70 percent of smartphones based on the Android Open Source Project run Google's ecosystem (which is known simply as Android), some with vendor-customized user interfaces and software suites, such as TouchWiz and later One UI by Samsung and HTC Sense.[10] Competing ecosystems and forks of AOSP include Fire OS (developed by Amazon), ColorOS by Oppo, OriginOS by Vivo, MagicUI by Honor, or custom ROMs such as LineageOS.

Android has been the best-selling OS worldwide on smartphones since 2011 and on tablets since 2013. As of May 2021[update], it had over three billion monthly active users, the largest installed base of any operating system in the world,[11] and as of January 2021[update], the Google Play Store featured over 3 million apps.[12] Android 14, released on October 4, 2023, is the latest version, and the recently released Android 12.1/12L includes improvements specific to foldable phones, tablets, desktop-sized screens[13] and Chromebooks. 0852c4b9a8

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