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The next task is to make the buttons do something when they are pressed. First, you need to get the UI ready. The errors occur because the buttons have changed their id and now these constraints are referencing non-existent views.
If you have these errors, fix them by updating the id of the buttons in the constraints that are underlined in red. Your app's layout is now basically complete, but its appearance can be improved with a few small changes. One way to do this is to use the Constraint Widget in the Attributes panel. The number on each side is the margin on that side of the selected view. Type 24 in the field and press Enter. When you remove the background, the view background becomes transparent. Increase the text size of the TextView to 72sp.
If you implemented all the updates, your app will look like the following figure. If you used different colors and fonts, then your app will look a bit different.
You have added buttons to your app's main screen, but currently the buttons do nothing. In this task, you will make your buttons respond when the user presses them. First you will make the Toast button show a pop-up message called a toast.
Next you will make the Count button update the number that is displayed in the TextView. To make your life easier, you can enable auto-imports so that Android Studio automatically imports any classes that are needed by the Java code.
Close the settings editor by pressing OK. In this step, you will attach a Java method to the Toast button to show a toast when the user presses the button. A toast is a short message that appears briefly at the bottom of the screen. This class has only two methods, onCreateView and onViewCreated. These methods execute when the fragment starts. As mentioned earlier, the id for a view helps you identify that view distinctly from other views. Take a look at onViewCreated. You have learned that to make a view interactive you need to set up a click listener for the view which says what to do when the view button is clicked on.
The click listener can either:. The method that shows the toast is very simple; it does not interact with any other views in the layout.
In the next step, you add behavior to your layout to find and update other views. Update the Count button so that when it is pressed, the number on the screen increases by 1. However, countMe is called every time the button is clicked, and findViewById is a relatively time consuming method to call.
So it is better to find the view once and cache it. Here is the whole method and the declaration of showCountTextView :. So far, you've focused on the first screen of your app.
Next, you will update the Random button to display a random number between 0 and the current count on a second screen. The screen for the new fragment will display a heading title and the random number. The R is just a placeholder. This TextView is constrained on all edges, so it's better to use a vertical bias than margins to adjust the vertical position, to help the layout look good on different screen sizes and orientations.
If you get a warning "Not Horizontally Constrained," add a constraint from the start of the button to the left side of the screen and the end of the button to the right side of the screen.
Your app now has a completed layout for the second fragment. But if you run your app and press the Random button, it may crash. The click handler that Android Studio set up for that button needs some changes. In the next task, you will explore and fix this error.
When you created your project, you chose Basic Activity as the template for the new project. When Android Studio uses the Basic Activity template for a new project, it sets up two fragments, and a navigation graph to connect the two. It also set up a button to send a string argument from the first fragment to the second. This is the button you changed into the Random button. And now you want to send a number instead of a string. A screen similar to the Layout Editor in Design view appears.
It shows the two fragments with some arrows between them. After a few moments, Android Studio should display a message in the Sync tab that it was successful:. The Arguments section shows Nothing to show. In this step you'll change it to send a number for the current count. You will get the current count from the text view that displays it, and pass that to the second fragment. You have written the code to send the current count to the second fragment.
The next step is to add code to SecondFragment. The intention of this codelab was to get you started building Android apps. We hope you want to know a lot more though, like how do I save data? How do I run background tasks? How do I display a list of photos? How do I We encourage you to keep learning.
We have more Android courses built by Google to help you on your learning journey. These interactive, video-based courses were created by Google experts in collaboration with Udacity. Take these courses at your own pace in your own time.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4. For details, see the Google Developers Site Policies. What you must know already This codelab is written for programmers and assumes that you know either the Java or Kotlin programming language.
What you'll learn How to use Android Studio to build your app. How to run your app on a device or in the emulator. How to add interactive buttons. How to display a second screen when a button is pressed.
The installation is similar for all platforms. Any differences are noted below. Navigate to the Android Studio download page and follow the instructions to download and install Android Studio. Accept the default configurations for all steps, and ensure that all components are selected for installation.
After the install is complete, the setup wizard downloads and installs additional components, including the Android SDK. Be patient, because this process might take some time, depending on your internet speed. When the installation completes, Android Studio starts, and you are ready to create your first project. Task: Create your first project In this step, you will create a new Android project for your first app. Here's what the finished app will look like: What you'll learn How to create a project in Android Studio.
How to create an emulated Android device. How to run your app on the emulator. How to run your app on your own physical device, if you have one. Step 1: Create a new project Open Android Studio.
Select Basic Activity not the default. Click Next. Give your application a name such as My First App. Make sure the Language is set to Java. Leave the defaults for the other fields. Click Finish. This is usually in a folder called AndroidStudioProjects below your home directory. Builds your project this may take a few moments. Android Studio uses Gradle as its build system.
You can follow the build progress at the bottom of the Android Studio window. Opens the code editor showing your project. Step 2: Get your screen set up When your project first opens in Android Studio, there may be a lot of windows and panes open. If there's a Gradle window open on the right side, click on the minimize button — in the upper right corner to hide it. Depending on the size of your screen, consider resizing the pane on the left showing the project folders to take up less space.
Step 3: Explore the project structure and layout The upper left of the Android Studio window should look similar to the following diagram: Based on you selecting the Basic Activity template for your project, Android Studio has set up a number of files for you. Double-click the app 1 folder to expand the hierarchy of app files. See 1 in the screenshot. If you click Project 2 , you can hide or show the Project view. Expand the manifests folder. The java folder contains three subfolders: com.
It includes these subfolders: drawable : All your app's images will be stored in this folder. Step 4: Create a virtual device emulator In this task, you will use the Android Virtual Device AVD manager to create a virtual device or emulator that simulates the configuration for a particular type of Android device.
The first step is to create a configuration that describes the virtual device. The Select Hardware window shows a list of pre-configured hardware device definitions. Choose a device definition, such as Pixel 2 , and click Next. For this codelab, it really doesn't matter which device definition you pick.
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The newest OS updates. The biggest announcements. There are ways to add to and expand your Minecraft experience, and there are alternatives for you to try. It became the best-selling video game for a reason, so if you want to augment the experience or try something similar here are some options for you. You can take your Minecraft gameplay to the next level with Mod-Master for Minecraft. It comes as a free or a premium version, and you can use it to add just about anything to your game.
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