For the past one month, i have been doing development in React Native. I am using the expo-cli to create the project and using my physical Android phone for testing. It’s time to install the Android emulator on my laptop, so that i don’t have to check my phone every-time.
For this we have to install Android Studio 3+ first, so head over to this link or google it and download.
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Android Studio
It is 724 MB for mac, so will take sometime to download. Once the dmg file is downloaded, you will get the below screen. You need to drag Android Studio to Applications
Downloaded
Now, when you open Android Studio on your mac, it will show below screen. Click on Next Kayak explore mac app.
First
On next screen choose Standard and click on Next.
Standard
On the next screen, select any theme and click Next.
Theme
On the next screen, click Finish.
Verify Settings
On the next screen,it will start the download and will take sometime.
Downloading Components
Once the download is complete, you will see the below screen.
Finally
Click on Configure and then Preferences from drop-down.
Preferences
Goto System Settings -> Android SDK and copy the Android SDK location, somewhere.
Preferences
In the Android Studio Screen, click on Start a new Android Studio Project. Take any default setting for a project and then click on the Search icon on the top right corner. Type AVD and it will open below screen.
AVD
Once you click on +Create Virtual Device, you need to choose a device.
Device
Then you need to choose an OS from the next screen. Click on download for any latest android version.
OS
It will open the below screen and download Android image. It will take sometime as the file is huge(1 GB).
Huge installation
Once the Download is finish, the Finish button will appear. Click on it and then the Next button on the earlier screen.
Click Next
In the next screen change the AVD Name if you want and click finish.
Finished
Next, we need to open the terminal and add two export in the .bash_profile file. Notice that the path is what was in Android SDK location
bash_profile
Next run the below command in terminal
After that in Android Studio, open the AVD Manager. It is in the top right corner and will open the Your Virtual Devices pop-up. Inside it click the run button.
Your Virtual Devices
It will open your Android emulator.
Emulator
Now, start any of your completed React-native project by npm start. If you don’t have any yet, create one using my previous blog to create a Restaurant Search React-native app here.
Click on Run on Android device/emulator and it will try to open it. First time it will also install expo app on the Android simulator.
Android emulator
If successful, you will see our restaurant app running on Android Simulator.
Restaurant app
Hope you liked this setup blog. See you soon :) https://xcrjbkj.weebly.com/blog/learning-how-to-code-mac-apps.
React Native is the go-to platform if you’re versed in React and need to develop mobile applications. Instead of using a hybrid approach like several projects out there, React Native aims to develop native applications with the tooling we already use in web development.
For the most part, this approach works perfectly, specially if you’re part of small team and lack the resources to develop full native code for both Apple and Android devices, but you need to be aware of its pros and cons, as in any other decision you have to make. Fortunately, Airbnb published a very nice article covering this subject, so make sure you read it.
And after doing your own reserch, you decided that React Native will work just fine for your needs, so now what? Well, this article will show how to get your app up and running on simulators for both iOS and Android devices, as well as how to set up your project.
Installing Xcode
To use iOS simulators, you’ll need a Mac. You may be able to run your app using services like Appetize (which I haven’t tested), but given that my main development environment is macOS, this is what I’ll focus on this article.
Many web developers out there are used to installing only the command-line tools, without the Xcode IDE, so they can build extensions or even use homebrew. To use iOS simulators, you’ll need the full thing, so go to the App Store and install Xcode.
This may take a while. When is done, open Xcode and install the extra components.
Now, you can install the iOS simulators. Go to “Preferences > Components” and download as many simulators as you want. I usually install only the latest version, but that’s on you and how far back you want to support.
As far as Xcode goes, you’re done! Now, let’s set up the Android emulator.
Installing Android Studio
![Avd native app mac desktop Avd native app mac desktop](/uploads/1/3/4/2/134205797/721856745.png)
Android’s ecosystem is different than Apple’s. First, you can install several third party emulators, some free, some paid. If you don’t want to choose, just use Android Studio, the official IDE.
After downloading Android Studio, move the app to your
/Applications
folder.Now, open the app and follow the instructions. If you don’t have an Android SDK available, you’ll see a screen like the following:
Just click on “Next” when Android Studio will install it for you.
When is done, you be presented with a welcome screen.
Go to “Configure > SDK Manager”, then head to “SDK Tools”. Click on the checkbox to install the Build Tools, which will be used by React Native command-line tools. Click in “Apply” to install it.
Now, notice the Android SDK Location available on the image above. You’ll need this value to define an environment variable on the terminal. This is where things get tricky because you may have configured your terminal different than mine, but in general lines, you’ll have to do one of the following:
- If you use bash, add the following lines to
~/.bashrc
. - If you use zsh, add the following lines to
~/.zshrc
.
Restart your terminal to reload your configuration. You can check your configurations like the following:
If you see anything too far from the above output, make sure you added the
export
lines to the correct files and restarted your terminal.Finally, you can create a virtual device. Back to the welcome screen, go to “Configure > AVD Manager”.
Click on “Create Virtual Device” and select a device definition. In this example I’m selecting Pixel 3.
When you’re done, click on “Next”. Now you have to choose which Android version you’re going to use. You can go with the latest stable version available, which right now is Android Pie. Make sure you click the “Download” link.
After downloading the system image, click on “Next” once more. You’ll be presented with the device profile you’re creating. Just click “Finish”.
Now you’re back to the list of virtual devices available on your computer and you can always create more.
To start the emulator, click the play button available under the “Actions” column. Always remember to start the emulator by clicking the play button; otherwise, you’ll see a message like
No connected devices!
when trying to run React Native on the Android emulator.You can also start the emulator from the command-line. All you have to do is using the
emulator
command.Congrats! You’re done with configuring emulators. Now, let’s spin up a sample app and run it on both simulators.
Configuring React Native
The official documentation recommends installing react-native-cli globally, but I avoid installing global packages. We’re going to use
npx
to generate the app skeleton.![App App](/uploads/1/3/4/2/134205797/169819206.png)
Go to the projects directory with
cd sample
and run react-native run-ios
. This will compile the app, install it on the emulator and run a separate tab with Metro, the JavaScript bundler for React Native developed by Facebook.This is the tab you should keep an eye on because any errors while running your app will be outputted to it. After everything is up and running, you’ll be able to see the sample app running on the iOS simulator.
Great! What about Android simulator? Make sure you have the virtual device running (remember, from the Android Studio’s welcome screen, choose “Configure > AVD Manager”, then press the play button). You can check for running devices by executing
adb devices
.Now, you can run
react-native run-android
. This will also compile a bunch of stuff and initialize the emulator.You’ll be able to see the app running on the Android simulator if everything went smoothly.
Running physical devices
At some point you’re better off testing your apps on physical devices. This can help you fix bad user experience that wouldn’t bother on simulators.
Running the app on your iPhone
To run your app on the iPhone, open
ios/sample.xcodeproj
on Xcode. You can use open ios/sample.xcodeproj
to open this file from your terminal.First, you have to select a developer profile. Click on the project name and go to the target you’re building (in this case,
sample
). Change the bundle identifier to your own domain, otherwise you won’t be able to build the project. Then click “Add Account”, enter your Apple ID and password, and select your name under the dropdown. You may also have to select your developer account for the sampleTests
target.Connect your iPhone to the computer and click the simulator selector.
Your device will be available on the top of the list.
Finally, click the “Build and Run” button, or press cmd-R. This will install and open the app on your iPhone.
Running the app on your Android
I didn’t have an Android device, but decided to buy one to test the app on the real thing. After some research, I decided to buy a Xiaomi Mi A2 which costed me around $170 on Amazon. It’s a very nice device, even for daily usage. The good thing about it is that it comes with stock Android, and not the shitty modified version that some companies ship (looking at you, Samsung).
First, make sure Developer Options is enabled. Here, things can get tricky. Different devices can be activated differently. In my case, I had to go to “Settings > About phone” and tap the Build number 7 times in order to activate the developer mode. Then go to “Settings > System > Advanced > Developer Options” and activate “USB Debugging”.
To verify that your device is ready, run
adb devices
on your terminal.Now, run
react-native run-android
. This command will install and open the app on your Android device.Using TypeScript
This step is optional, but if you’re planning to release your app as an open-source project you may consider using TypeScript, the typed language that compiles down to JavaScript, created by Microsoft.
For new projects, all you have to do is running the generator with
--template typescript
.For existing projects, you’ll need to manually configure everything that the TypeScript template provides. I won’t cover this migration process here, so make sure you read the article published on the official blog.
Avd Native App Mac Desktop
Wrapping up
Despite all the efforts on developing the ecosystem, React Native is still immature and you’ll find that developing apps can be challenging. But even with all these difficulties, I consider React Native the best solution for small companies/teams that need to develop native apps.
Avd Native App Mac Os
Before deep diving into React Native, ask yourself if a PWA is a viable solution. Unfortunaly, PWA comes with its own challenges, like a different mindset for installing apps and inconsistencies between Android and iOS, as well as several device limitations, but it may be a good first step towards mobiles apps when responsive web is not enough, but React Native is too much.
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