Web application that supports a mobile version for Android. Android. Let's create an application using JQueryMobile. Beaver Oil Corporation

Figure 1. You can make your web content available to users in two ways: in a traditional web browser and in an Android application, by including a WebView in the layout.

Android offers a variety of ways to present content to a user. To provide a user experience that’s consistent with the rest of the platform, it’s usually best to build a native app that incorporates framework-provided experiences, such as Android App Links or Search . Additionally, you can use Google Play-based experiences, such as App Actions and Slices, where Google Play services is available. Some apps, however, may need increased control over the UI. In this case, a WebView is a good option for displaying trusted first-party content.

Figure 1 illustrates how you can provide access to your web pages from either a browser or your own Android app. The WebView framework allows you to specify viewport and style properties that make your web pages appear at the proper size and scale on all screen configurations for all major web browsers. You can even define an interface between your Android app and your web pages that allows JavaScript in the web pages to call upon APIs in your app-providing Android APIs to your web-based application.

However, you shouldn't develop an Android app simply as a means to view your website. Rather, the web pages you embed in your app should be designed especially for that environment.

Although WebView objects provide increased control over the UI, there are alternatives that may provide similar functionality with various advantages: they require less configuration, may load and perform faster, provide improved privacy protections, and can access the browser's cookies.

Consider using these alternatives to WebView if your app falls into the following use cases:

• If you want to send users to a mobile site,

Despite the fact that mobile applications, like mobile websites, work on smartphones and tablets, they are different from each other. Progressive Web Apps (PWA) is an open source Google initiative that leverages modern web experiences to provide users better experience than native apps or mobile sites. Because it is a relatively new framework, it is not yet supported by all browsers and does not support some of the features that make native apps so attractive to consumers: camera use, GPS, and a fingerprint scanner. This will certainly change if PWAs gain wider acceptance.

Today, the emergence of PWA represents the same breakthrough in the mobile web as the emergence of responsive web design five years ago. This new technology, which will inevitably evolve and change over the years as developers continually improve versions of it and brands increasingly turn to PWAs as part of their mobile strategies.

PWA has several benefits for users, one of them is faster browsing. They are instantly discovered in the browser without the need to download an app and can work anywhere, including in areas with low level Internet signal. They can be "saved" to the home screen, at least on Android devices, for easy access and a personalized interaction channel. They also provide quick re-access without having to open a browser and enter a web address.

Well-designed PWAs are up to four times faster than other mobile sites, helping to speed up the purchasing process as purchasing a product is just a few clicks away, keeping customers engaged.

There are other benefits for marketers, too. PWAs are predicted to have a big impact on conversion rates in mobile devices ah, and also reduce the high investment costs associated with developing your own applications.

PWAs look just like native apps and ultimately customers will prefer PWAs because they have more high speed, provide the same experience as native apps, and also allow you to use any mobile site offline.

PWAs also support browser push notifications, allowing marketers to send contextual and personalized messages in real time with a single click directly from the PWA.

Because PWAs are websites at their core, they are easier to update and don't require users to download and install an updated version of the app. Moreover, they can be easily found in search engines, - this means that the potential audience reach is millions of customers.

However, along with the advantages, PWAs also have some disadvantages, and for some, these can be a deciding factor in their decision.

The key problem is that not all browsers currently support PWA. While newer versions Chrome browser, Opera and Android support PWA, IE, Edge, Safari and many custom browsers do not. Currently, PWAs do not support all the hardware components supported by traditional native apps, including cameras, GPS, and fingerprint scanners on mobile phones.

Another challenge is that traditionally app stores have been central repositories for apps, helping users find what they need and maintaining a certain level of legitimacy. However, PWAs do not require such stores, so marketers may have some difficulty promoting their PWAs and their legitimacy.

Finally, many third party applications, which require login, such as Facebook and Google, will continue to ask for a login and password, since PWAs cannot collect this data themselves.

The popularity and functionality of PWAs is only gaining momentum; in the coming years they will become more popular and improve technologically. According to experts, a significant increase in the number of PWAs is expected, since companies such as Pinterest, Tinder, Uber and Starbucks have already launched PWAs with excellent results. The number of features supported by PWAs will also increase year by year. For marketers, a significant advantage will be the ease of collecting analytical data, because PWAs integrate perfectly with standard tools analytics from Google and Adobe.

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Sometimes there is a need to create a website, blog, or client application social network for Android or a simple calculation application. One way is to create a mini website inside our Android application.

In this tutorial, we use JQueryMobile as the engine to create our application. This will give us the opportunity to create the look and some functionality of our application using HTML5, CSS3, JavaScript. Such an application can be available in two modes: offline - when all files (pages) are inside the application or online - when we receive pages or data remotely. About technology and additional features You can read it on off. website: http://jquerymobile.com/.

My favorite style is setting a task and then pursuing the goal. And so, let's say we need to create an application that will calculate kcal. for people, depending on the goal that a person has set for himself, his height, weight, age. This will be a regular offline application.

For calculations we use the Harris-Benedict formula. It looks like this:

Calorie intake = BMR x Activity level, where

Men:

BMR = 88.36 + (13.4 x weight, kg) + (4.8 x height, cm) – (5.7 x age, years)

Women:

BMR = 447.6 + (9.2 x weight, kg) + (3.1 x height, cm) – (4.3 x age, years)

and activity level during the week:

Minimum level, calorie norm = 1.2
Low, calorie intake = 1.375
Average, calorie intake = 1.55
High, calorie intake = 1.725
Very high, calorie intake = 1.9

And also 2 conditions:

1. If a person wants to gain weight, then he needs “+ 20%”

2.If you need to lose weight, then “- 20%”

3. Lose weight quickly, then “- 40%”

After thinking and moving the mouse to the sides, I managed to create an application template.

Throughout the lesson we will follow this template and try to implement it. And so, let's start programming directly :-)

At this step we will create the design of our application. This step will be quite simple and exciting, since the construction of the application design and verification of correctness takes place directly in the browser.

Here's what I got:

And, of course, let’s describe the code that gave us this design:

Calorie calculation Calorie calculation

• About the program
• Calculate

This is a mini program to calculate the daily calorie intake for a person

Description of the activity item

There are five types of physical activity: minimal (no physical activity), low (physical activity 1-3 times a week), medium (3-5 days a week), high (6-7 times a week), very high (exercise more often). than once a day).

Let's look at what's here and why.

– we indicate that we will use HTML5. This will make it possible to use more features of the framework.

– we indicate how to display and zoom our page. We also set the encoding to support Russian text.

One document can have several “pages” - ready-made views. We will have 2 of them. Basic and “About the program”.

... ...

– hat

– body, the main part where all the content will be

– footer. This is where we put our control buttons. Navigation panel.

I don’t give an explanation for the main block, since it contains regular HTML code. Where we describe the elements we want to see. For us, this is a plate with form elements inside. Each element contains a unique identifier. Needed to receive data. Let's move on to the footer.

– creating a navigation bar.

href=’#info’ – id “page” inside the document, if we use “#”. When we click, we will see a “page” block with this id. Or we can refer to a completely different file or resource (URL).

data-icon=’info’ – set the icon.

And lastly, in this file, the second page block

Back– a button in the header to return to the main page.

And also our styles for pages.

Result-block( text-align: center; font-size: 20px; font-weight: bold; color: green; )

At this step we will write a script that will receive our data, read it and return it to the page.

Var MAN_COEFFICIENTS=( main: 88.36, weight: 13.4, height: 4.8, age: 5.7 ); var WOMAN_COEFFICIENTS=( main: 447.6, weight: 9.2, height: 3.1, age: 4.3 ); var INCREASE = 1.2; var DECREASE = 0.8; var QUICK_DECREASE = 0.4; var ACTIVITY_COEFF = function forMan(weight, height, age, active)( return (MAN_COEFFICIENTS.main + (MAN_COEFFICIENTS.weight * weight) + (MAN_COEFFICIENTS.height * height) + (MAN_COEFFICIENTS.age * age)) * ACTIVITY_COEFF; ) function forWoman(weight, height, age, active)( return (WOMAN_COEFFICIENTS.main + (WOMAN_COEFFICIENTS.weight * weight) + (WOMAN_COEFFICIENTS.height * height) + (WOMAN_COEFFICIENTS.age * age)) * ACTIVITY_COEFF; ) function getData())( var data=( weight: parseFloat(document.getElementById("weight").value), age: parseInt(document.getElementById("age").value), height: parseInt(document.getElementById("height").value ), active: parseInt(document.getElementById("active").value), target: parseInt(document.getElementById("target").value), sex: parseInt(document.getElementById("sex").value) ) ; return data; ) function calculateData())( var result; var data = getData(); switch (data.sex)( case 1: result = forMan(data.weight, data.height, data.age, data.active) ; console.log(result); break; case 2: result = forWoman(data.weight, data.height, data.age, data.active); ) switch (data.target)( case 1: return result; case 2: return result * INCREASE; case 3: return result * DECREASE; case 4: return result * QUICK_DECREASE; ) ) function showData())( document.getElementById(" result").innerHTML = calculateData(); )

To make the script work, connect it to the document:

And we add a function call when clicking on the “Calculate” button.

After this, when you press the button, data will be calculated and information will be displayed.

After we have prepared all the files, all that remains is to configure our project. An Android application can be built in any environment that is convenient for you. The first step will be to add our project files. They need to be placed in the assets folder. If the application is built in Eclipse or intelijIdea, then this directory is located in the root of the project. Add these files there. If the application structure is built in AndroidStudio using Gradle, then you need to create this directory along the path src/main/assets. I added the files to the www/ folder, which contains our pages.

Now we pass to our component the path to the file that will be loaded by default when the application is opened. This all happens in the class that is created by the default environment. In it we change the behavior of the method that generates view:

@Override protected void onCreate(Bundle savedInstanceState) ( super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); WebView webView = (WebView) findViewById(R.id.webView); webView.getSettings().setJavaScriptEnabled(true ); webView.loadUrl("file:///android_asset/www/index.html");

findViewById(R.id.webView) – we get our container for displaying pages

webView.getSettings().setJavaScriptEnabled(true) – enable JavaScript support

webView.loadUrl(“file:///android_asset/www/index.html”) – load the page that is in our assets directory.

Now, since our page contains connecting libraries from the site (remotely), we need to add Internet access privileges to our application. This is done in the AndroidManifest.xml manifest file in one line at the beginning:

After that, all that remains is to send the application to the device. And you're done :-)

If you want to make an offline application so that you do not need access to the Internet, then download the libraries from the site, place them in a folder and change the path on the page. Also, then there is no need to specify Internet access permissions.

So, we need to download the necessary libraries. The first, main jQuery library is located at: http://jquery.com/download/ there, select the version and download it. We use this version: Download the compressed, production jQuery 2.1.0. Now we download jQueryMobile. Go to the official website: http://jquerymobile.com/ and download the archive with the files:

There are many files inside the archive. We only need a few of them: jquery.mobile-1.4.0.min.css, jquery.mobile-1.4.0.min.js and icons from the images/ directory. I will place these files in the root of the /www folder. After that, it’s worth changing the page links to the files that we just downloaded:

And also don’t forget to remove permission for Internet access from the manifest, we don’t need it now. In general, that's all.

Now, you have a small working application for Android. The speed, however, is inferior to the native version of creation, but this can be corrected. With a small application for you :-) I hope everything was accessible and interesting)

Bobromordov Evsey Sevyanovich (General Director)

Bobromordova Karina Evseevna (financial director)

Bobromordov Karen Evseevich (courier)

• You can make as many applications as you like and absolutely free.
• The material for creating a project can be a lot of different sources (web page, YouTube channel, PDF document, RSS feed, photo gallery, audio file, etc.).

• If you have ready-made material (a document, a link to a news feed, source code, and so on), the time spent on creating an application is measured in tens of seconds.
• When you complete the creation of the application, in addition to the link to the apk file, a QR code appears on the screen (I made it and immediately installed it on my phone) and a button for publishing on Google Play.
• The most striking advantage of AppsGeyser is the preview of the application (how it will look and work on the device). This feature is implemented here much more conveniently than its competitors. Only cooler Android SDK- camera, motion sensor and performance specific model You can’t test your phone on AppsGeyser.
• Another interesting feature of the service is the test constructor (Quiz).

• Preview ignores AJAX. Despite the fact that in a finished assembly this technology works great.

• There is an excellent visual editor to create an application with an amazing variety of toolbars. By simply moving the mouse pointer, you can add to the application incredibly wide range elements: from a simple TextBox to a user location sensor!

• Creating an application from our code here is more labor intensive. First you need to save the source with the html extension and upload it to the server. Then, in the workspace, drag the Web Viewer element onto the application field, in the settings of which specify the address of the page with our application. Now you can use the Build menu to get a finished assembly.
• The main disadvantage of App Inventor is that the compiled application requires an Internet connection to work (unlike the one created in AppsGeyser).

• It is possible to create several workspaces, establish connections between them, allocate space for advertising blocks- only about a hundred various settings. The functionality is by eye, approximately 80% of what AppsGeyser has, and 90% of App Inventor. And a bunch of other personal tricks. And the whole enterprise works quickly, beautifully and well.

• Preview is not inferior to AppsGeyser in speed and quality of work.
• A rich collection of design templates, combined with the ability to remake them beyond recognition.
• The interface is completely permeated with creativity. For example, on the first page of the program creation section you need to select the application type from 38 options (this is done purely for fun, when you click on different icons you end up in the same place).

• There is nowhere to paste the code. We have to work with our hands.
• There is a function for publishing applications, but appsbar is not yet aware that Android Market has long been known under the name Goggle Play.
• The interface is slow in places and has an abundance of “original” solutions. You almost constantly think about the mysterious soul and extraordinary thinking of its creators.

• Creation telephone directory the company from our code example is impossible using this service, but something similar can be done using built-in tools. Appbar is quite suitable for creating a business card application.