Android ui tutorial

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Android ui tutorial

Update Note : This tutorial is now up to date with the latest version of Android Studio version 3. Update by Joe Howard. Original tutorial by James Nocentini. Android runs on a wide variety of devices that offer different screen sizes and densities. Because of this, it is important for Android apps to have a responsive user interface that can adapt to these different screens.

Since the early days of the Android platform, system APIs have provided very powerful abstractions to design adaptive UIs, also known as adaptive layouts. This is an update to our adaptive UI in Android tutorial which will show you how to build apps that work across different devices by dealing with the fragmentation in the Android device market.

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What would a tutorial be without something to tinker with? Apps look so cool and well built when they have an adaptive UI. Download the starter project named Adaptive Weather hereand open it in Android Studio 3. Then build and run. Open the build. As you will see later on, it is a very useful tool for designing adaptive layouts.

Generally speaking:. As described in the Supporting Multiple Screens guide, the categories of screen densities are:. Whilst some UI editors make it easy to export images in different sizes, we will be exploring a different approach in this tutorial.

Android Studio recently added support for Vector Drawables. This means that all your assets can be imported once and will be scaled at runtime depending on the device configuration screen size and orientation. Download the Weather Icons and extract.

Android - UI Patterns

From the filesystem location chooser under Path locate the weather-icons folder and choose the first icon, cloud. Click Next and Finish :. Repeat the same operations for the other icons: fog, rain, snow, sun, thunder.

This simple application only contains one screen, which is represented by MainActivity. Click on the Preview button on the right side to see it in action.

An activity comprises a Kotlin or Java class — in this case MainActivity. First, define the default layout for your main activity. Instead of positioning the icons with margins or using a relative layout you have used the FlexBox properties to spread them symmetrically. If you remove a middle icon for example, the remaining ones will automatically shift to the left to fill in the empty space. This is the true power of using FlexBox in layouts.Talking about the UI components, the typical UI of any Android application consists of these components:.

These play a major role while you are developing a complex application.

android ui tutorial

A View is considered as a basic building block for a proper user interface that is actually created from the View class. This occupies a rectangular area on the screen and is eventually takes care of drawing and event handling. A View is the base class for widgets, which are used to create interactive UI components like buttons, text fields, etc. Now talking about the rectangle area or a box, It can either be an image, a piece of text, a button or anything that an android application can display.

The rectangle here is actually invisible, but every view occupies a rectangle shape. You might have a question, what can be the size of this rectangle? The answer is you can either set it manually by specifying the exact size with proper units or by using some predefined values.

A layout defines the structure for a User Interface in the application. All elements in the layout are built using a hierarchy of View and ViewGroup objects. Android provides a straightforward XML vocabulary that corresponds to the View classes and subclasses, such as those for widgets and layouts.

The application can create View and ViewGroup objects and manipulate their properties programmatically. The ViewGroups will be intermediate nodes in the hierarchy, and the views will be terminal nodes.

The linear layout is used to place one element on each line.

Build a simple user interface

So, all the elements will be placed in an orderly top-to-bottom fashion. This is a very widely-used layout for creating forms on Android. It can also be referred as a view group that aligns all children in a single direction, vertically or horizontally.

In absolute layout, you can specify the exact coordinates of each control that you want to place. In this type of layout, you can give the exact X and Y coordinates of each control. It enables you to specify the exact location of its children. A Relative Layout is a ViewGroup that displays child views in relative positions.In this lesson, you learn how to use the Android Studio Layout Editor to create a layout that includes a text box and a button.

This sets up the next lesson, where you learn how to make the app send the content of the text box to another activity when the button is tapped. The user interface UI for an Android app is built as a hierarchy of layouts and widgets. The layouts are ViewGroup objects, containers that control how their child views are positioned on the screen.

Widgets are View objects, UI components such as buttons and text boxes. Figure 2.

android ui tutorial

Illustration of how ViewGroup objects form branches in the layout and contain View objects. This lesson assumes that you use Android Studio v3.

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Figure 3. The Component Tree panel on the bottom left shows the layout's hierarchy of views. In this case, the root view is a ConstraintLayoutwhich contains just one TextView object. ConstraintLayout is a layout that defines the position for each view based on constraints to sibling views and the parent layout. In this way, you can create both simple and complex layouts with a flat view hierarchy.

This type of layout avoids the need for nested layouts. A nested layout, which is a layout inside a layout, as shown in figure 2, can increase the time required to draw the UI. Figure 4.

Illustration of two views positioned inside ConstraintLayout. Figure 5.

android ui tutorial

The text box is constrained to the top and left of the parent layout. Figure 6. The button is constrained to the right side of the text box and its baseline. Note: You can also use the top or bottom edges to create a horizontal alignment.

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However, the button image includes padding around it, so the visual alignment is wrong if created that way. Notice that the text input and button label are set to default values. This is a string resources file, where you can specify all of your UI strings. It allows you to manage all of your UI strings in a single location, which makes them easier to find, update, and localize.

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Click Add Key to create a new string as the "hint text" for the text box. At this point, the window shown in figure 7 opens.

Now you can set these strings for each view. Then, add the strings as follows:. To create a layout that's responsive to different screen sizes, you need to make the text box stretch to fill all the horizontal space that remains after the button and margins are accounted for.

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Before you continue, click Select Design Surface in the toolbar and select Blueprint. Select both views.Following is the pictorial representation of user interface UI or input controls in android application.

Generally, in android the user interface of an app is made with a collection of View and ViewGroup objects. The ViewGroup is a subclass of View and it will act as a base class for layouts and layout parameters. The ViewGroup will provide invisible containers to hold other Views or ViewGroups and to define the layout properties. The layout file must contain only one root element, which must be a View or ViewGroup object. Once we define the root element, then we can add additional layout objects or widgets as a child elements to build View hierarchy that defines our layout.

In android, each input control is having a specific set of events and these events will be raised when the user performs particular action like, entering the text or touches the button. Once we are done with the creation of layout with UI controls, we need to load the XML layout resource from our activity onCreate callback method like as shown below. If you observe above code we are calling our layout using setContentView method in the form of R.

If we want to create UI elements at runtime, we need to create our own custom View and ViewGroup objects programmatically with required layouts. By creating a custom View and ViewGroups programmatically, we can define UI controls in layouts based on our requirements in android applications. We have a different type of UI controls available in android to implement the user interface for our android applications.

In android, TextView is a user interface control that is used to display the text to the user. In android, EditText is a user interface control which is used to allow the user to enter or modify the text.

In android, AutoCompleteTextView is an editable text view which is used to show the list of suggestions based on the user typing text. The list of suggestions will be shown as a dropdown menu from which the user can choose an item to replace the content of the textbox. In android, Button is a user interface control that is used to perform an action when the user clicks or tap on it.

To know more about Button in android check this, Android Buttons with Examples. In android, Image Button is a user interface control that is used to display a button with an image to perform an action when the user clicks or tap on it.

Generally, the Image button in android looks similar as regular Button and perform the actions same as regular button but only difference is for image button we will add an image instead of text.

In android, Checkbox is a two-states button that can be either checked or unchecked. In android, Radio Button is a two-states button that can be either checked or unchecked and it cannot be unchecked once it is checked. In android, Radio Group is used to group one or more radio buttons into separate groups based on our requirements. In case if we group radio buttons using the radio group, at a time only one item can be selected from the group of radio buttons.

In android, ProgressBar is a user interface control which is used to indicate the progress of an operation. In android, Spinner is a drop-down list which allows a user to select one value from the list. To know more about Spinner, check this Android Spinner with Examples. We learn all android user interface UI controls in next chapters in detailed manner with examples.Android widgets are easy to learn.

The widely used android widgets with examples are given below:. JavaTpoint offers too many high quality services. Mail us on hr javatpoint.

Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. Android Training Android Tutorial. Spring Boot. Selenium Py. Verbal A. Angular 7.

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Cyber Sec. Control S. Data Mining. Javatpoint Services JavaTpoint offers too many high quality services. The widely used android widgets with examples are given below: Android Button Let's learn how to perform event handling on button click. Android Toast Displays information for the short duration of time.

CheckBox Let's see the application of simple food ordering. Spinner Spinner displays the multiple options, but only one can be selected at a time. RatingBar RatingBar displays the rating bar. DatePicker Datepicker displays the datepicker dialog that can be used to pick the date. TimePicker TimePicker displays the timepicker dialog that can be used to pick the time.

ProgressBar ProgressBar displays progress task.All across the web, you'll find guides on setting up various apps and mods for your Android device—but while these are certainly useful, they all seem to be working under the assumption that the reader has a certain level of knowledge about Android. For someone that's just getting started with the world's most popular mobile operating system, the basics of Android simply aren't covered as well as they should be.

For several months now, we've been working on a series of Android guides with one common goal—to educate users on topics they aren't entirely familiar with. By this point, we've amassed quite a few of these Android Basics tutorials, so we're happy to share a list of links below. The guides are organized into two main sections, and the full list is in ascending order based on experience level—after all, we all have to start somewhere, right?

This is an ongoing project, so we'll continue to create Android Basics tutorials and update this article with new links as they're published. If you have any friends or family members who are new to Android, we'd encourage you to share this article with them directly.

Want to help support Gadget Hacks and get a great deal on some sweet new tech? Check out all the deals on the new Gadget Hacks Shop. Sign Up. Share Your Thoughts Click to share your thoughts. Hot Latest.You may find this useful before you start your own project. You can download the demo project on GitHub.

The basic building block for Android UI is layout. There are a few options like frame layouts, linear layouts relative layouts, grid layouts. We can start basically with a linear layout on the top, which is a container for everything.

And then we put an ImageView on the top of the LinearLayoutin which it has an option to lay its children horizontally or vertically so you can specify and attribute. Then we can put two text views, one below each other, inside a linear layout with a vertical orientation. We want it to make the hierarchy as shallow as possible. One way to do make the hierarchy shallower is to use a relative layout.

If you handle all the rendering by yourself, you can achieve this just by using one custom view.

Modern Dashboard UI Design Android Studio Tutorial

If the system only needs to inflate just a single view for the item, scrolling is going to be very smooth. Personally I still go to the actual. For my work, I tend to just throw in some stuff there that we need to build and then fine tune it in the actual.

android ui tutorial

Above is a standard. If you look at the image above, notice the tag name is the type of view or layout you want to put into your UI. Typically everything is going to start with the android:.

Android Studio has this fantastic way where you can type any part of a string, it'll show you a list of suggestions to complete the string.

So, without further ado, let's start fixing this code. Using wrapped content is good, but using hard-coded body here can lay out things a bit correctly. Everything is generalized as a resource. You can have your custom views written in Java already. A ListView shows things in a vertical list, which is one of the most used views in Android.

Furthermore, GridView is kind of outdated. Since last summer, Google actually introduced the RecyclerView. For one thing, ListView will only show you vertical lists. However, if you use a RecyclerViewyou can do pretty much anything. But the idea is that you can actually populate these RecyclerView s and then see it on the real device using this tool. In our Java code AlbumListActivity. Here is how we can populate the views:.

Basically one thing to remember is that in order to populate this RecyclerViewwe need to create an adapterand in this adapter we kind of create some data.

For each of the views there, you want to create one thing which is called ViewHolder. Again, this project is on GitJub so that you can try it out yourself.


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