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React Native is like React, but it uses native components instead of web components as building blocks. So to understand the basic structure of a React Native app, you need to understand some of the basic React concepts, like JSX, components, state, and props. If you already know React, you still need to learn some React-Native-specific stuff, like the native components. This tutorial is aimed at all audiences, whether you have React experience or not.

Let's do this thing.

Hello World#

React Native Spotify Clone Table of Contents. Demo; Feature; Improvement; Folder structure; Install; Demo. Feature 🌟 Using react navigation ⭐️ Create 3 screen: HomeScreen, AlbumScreen. Save your App.js, you should now have something that looks like this. Recreating the Playlist. Now for the all important part of any playlist, the songs themselves! We'll achieve this by using a React Native. Again, we'll just add some mock data for the time being until we set up GraphQL. Modify your App. React Native is like React, but it uses native components instead of web components as building blocks. So to understand the basic structure of a React Native app, you need to understand some of the basic React concepts, like JSX, components, state, and props. If you already know React, you still need to learn some React-Native-specific stuff, like the native components. This tutorial is aimed.

In accordance with the ancient traditions of our people, we must first build an app that does nothing except say 'Hello, world!'. Here it is:

If you are feeling curious, you can play around with sample code directly in the web simulators. You can also paste it into your App.js file to create a real app on your local machine.

What's going on here?#

1. First of all, we need to import React to be able to use JSX, which will then be transformed to the native components of each platform.
2. On line 2, we import the Text and View components from react-native

Then we find the HelloWorldApp function, which is a functional component and behaves in the same way as in React for the web. This function returns a View component with some styles and aText as its child.

The Text component allows us to render a text, while the View component renders a container. This container has several styles applied, let's analyze what each one is doing.

The first style that we find is flex: 1, the flex prop will define how your items are going to 'fill' over the available space along your main axis. Since we only have one container, it will take all the available space of the parent component. In this case, it is the only component, so it will take all the available screen space.

The following style is justifyContent: 'center'. This align children of a container in the center of the container's main axis and finally we have alignItems: 'center', which align children of a container in the center of the container's cross axis.

Some of the things in here might not look like JavaScript to you. Don't panic. This is the future.

First of all, ES2015 (also known as ES6) is a set of improvements to JavaScript that is now part of the official standard, but not yet supported by all browsers, so often it isn't used yet in web development. React Native ships with ES2015 support, so you can use this stuff without worrying about compatibility. import, from, class, and extends in the example above are all ES2015 features. If you aren't familiar with ES2015, you can probably pick it up by reading through sample code like this tutorial has. If you want, this page has a good overview of ES2015 features.

The other unusual thing in this code example is <View><Text>Hello world!</Text></View>. This is JSX - a syntax for embedding XML within JavaScript. Many frameworks use a specialized templating language which lets you embed code inside markup language. In React, this is reversed. JSX lets you write your markup language inside code. It looks like HTML on the web, except instead of web things like <div> or <span>, you use React components. In this case, <Text> is a Core Component that displays some text and View is like the <div> or <span>.

Components#

So this code is defining HelloWorldApp, a new Component. When you're building a React Native app, you'll be making new components a lot. Anything you see on the screen is some sort of component.

Props#

Most components can be customized when they are created, with different parameters. These creation parameters are called props.

Your own components can also use props. This lets you make a single component that is used in many different places in your app, with slightly different properties in each place. Refer to props.{NAME} in your functional components or this.props.{NAME} in your class components. Here's an example:

Using name as a prop lets us customize the Greeting component, so we can reuse that component for each of our greetings. This example also uses the Greeting component in JSX. The power to do this is what makes React so cool.

The other new thing going on here is the View component. A View is useful as a container for other components, to help control style and layout.

With props and the basic Text, Image, and View components, you can build a wide variety of static screens. To learn how to make your app change over time, you need to learn about State.

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State#

Unlike props that are read-only and should not be modified, the state allows React components to change their output over time in response to user actions, network responses and anything else.

What's the difference between state and props in React?#

In a React component, the props are the variables that we pass from a parent component to a child component. Similarly, the state are also variables, with the difference that they are not passed as parameters, but rather that the component initializes and manages them internally.

There are differences between React and React Native to handle the state?#

As shown in the image, there is no difference in handling the state between React and React Native. You can use the state of your components both in classes and in functional components using hooks!

In the following example we will show the same above counter example using classes.

Android requires that all apps be digitally signed with a certificate before they can be installed. In order to distribute your Android application via Google Play store it needs to be signed with a release key that then needs to be used for all future updates. Since 2017 it is possible for Google Play to manage signing releases automatically thanks to App Signing by Google Play functionality. However, before your application binary is uploaded to Google Play it needs to be signed with an upload key. The Signing Your Applications page on Android Developers documentation describes the topic in detail. This guide covers the process in brief, as well as lists the steps required to package the JavaScript bundle.

Generating an upload key#

You can generate a private signing key using keytool. On Windows keytool must be run from C:Program FilesJavajdkx.x.x_xbin.

This command prompts you for passwords for the keystore and key and for the Distinguished Name fields for your key. It then generates the keystore as a file called my-upload-key.keystore.

The keystore contains a single key, valid for 10000 days. The alias is a name that you will use later when signing your app, so remember to take note of the alias.

On Mac, if you're not sure where your JDK bin folder is, then perform the following command to find it:

It will output the directory of the JDK, which will look something like this:

Navigate to that directory by using the command $ cd /your/jdk/path and use the keytool command with sudo permission as shown below.

Note: Remember to keep the keystore file private. In case you've lost upload key or it's been compromised you should follow these instructions.

Setting up Gradle variables#

1. Place the my-upload-key.keystore file under the android/app directory in your project folder.
2. Edit the file ~/.gradle/gradle.properties or android/gradle.properties, and add the following (replace ***** with the correct keystore password, alias and key password),

These are going to be global Gradle variables, which we can later use in our Gradle config to sign our app.

Note about security: If you are not keen on storing your passwords in plaintext, and you are running OSX, you can also store your credentials in the Keychain Access app. Then you can skip the two last rows in ~/.gradle/gradle.properties.

Adding signing config to your app's Gradle config#

The last configuration step that needs to be done is to setup release builds to be signed using upload key. Edit the file android/app/build.gradle in your project folder, and add the signing config,

Generating the release APK#

Run the following in a terminal:

Gradle's bundleRelease will bundle all the JavaScript needed to run your app into the AAB (Android App Bundle). If you need to change the way the JavaScript bundle and/or drawable resources are bundled (e.g. if you changed the default file/folder names or the general structure of the project), have a look at android/app/build.gradle to see how you can update it to reflect these changes.

Note: Make sure gradle.properties does not include org.gradle.configureondemand=true as that will make the release build skip bundling JS and assets into the app binary.

GitHub - Guilherme2020/spotify-react-native: Clone Of Spotify ...

The generated AAB can be found under android/app/build/outputs/bundle/release/app.aab, and is ready to be uploaded to Google Play.

Note: In order for Google Play to accept AAB format the App Signing by Google Play needs to be configured for your application on the Google Play Console. If you are updating an existing app that doesn't use App Signing by Google Play, please check our migration section to learn how to perform that configuration change.

Testing the release build of your app#

Before uploading the release build to the Play Store, make sure you test it thoroughly. First uninstall any previous version of the app you already have installed. Install it on the device using the following command in the project root:

Note that --variant=release is only available if you've set up signing as described above.

You can terminate any running bundler instances, since all your framework and JavaScript code is bundled in the APK's assets.

Publishing to other stores#

By default, the generated APK has the native code for both x86 and ARMv7a CPU architectures. This makes it easier to share APKs that run on almost all Android devices. However, this has the downside that there will be some unused native code on any device, leading to unnecessarily bigger APKs.

You can create an APK for each CPU by changing the following line in android/app/build.gradle:

Upload both these files to markets which support device targeting, such as Google Play and Amazon AppStore, and the users will automatically get the appropriate APK. If you want to upload to other markets, such as APKFiles, which do not support multiple APKs for a single app, change the following line as well to create the default universal APK with binaries for both CPUs.

Enabling Proguard to reduce the size of the APK (optional)#

Proguard is a tool that can slightly reduce the size of the APK. It does this by stripping parts of the React Native Java bytecode (and its dependencies) that your app is not using.

IMPORTANT: Make sure to thoroughly test your app if you've enabled Proguard. Proguard often requires configuration specific to each native library you're using. See app/proguard-rules.pro.

To enable Proguard, edit android/app/build.gradle:

Migrating old Android React Native apps to use App Signing by Google Play#

If you are migrating from previous version of React Native chances are your app does not use App Signing by Google Play feature. We recommend you enable that in order to take advantage from things like automatic app splitting. In order to migrate from the old way of signing you need to start by generating new upload key and then replacing release signing config in android/app/build.gradle to use the upload key instead of the release one (see section about adding signing config to gradle). Once that's done you should follow the instructions from Google Play Help website in order to send your original release key to Google Play.