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Patrick Martin
Patrick Martin

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We will explore the tools available to develop, debug, and test your Progressive Web Apps.On this page Simulators and devicesSimple simulatorsApple simulatorsAndroid emulatorsDesktop emulatorsUsing physical devicesRemote inspectionChromium browsersService worker toolsStorage toolsWeb app manifest toolsInstallation debuggingSafariService worker toolsFirefoxTools for PWAsResourcesAll the tools available for web development are also helpful for progressive web app development, including libraries, frameworks, code editors, builders, developer tools, debuggers, and more. But when working with PWA-specific abilities, such as installability, service workers, offline support, and more, certain tools for PWA are extra helpful. Let's see them in action.Simulators and devices #As mentioned in the Foundations chapter, you should use agnostic design patterns to offer the best experience to every user in every context. However, it's good practice to test your experiences on different devices.CautionInstalled PWAs are new experiences for web developers to test and debug, but keep in mind that not every tool is compatible with this mode.You probably won't own dozens of physical devices, including iPhones, Android phones, tablets, and desktops or laptops with different operating systems. That's why simulators and emulators exist.Simple simulators #Most developer tools within browsers let you test your PWAs in different screen sizes or network conditions while using a single desktop browser engine. Some of these tools can also force a different user agent under these simulations.Some available simulators are:Chromium DevTools: Device Mode, network throttling and several sensor simulations availableFirefox Developer Tools: Responsive Design ModeSafari Web Inspector: Responsive Design Mode Some commercial and free solutions are optimized for developers and designers, such as the open source Responsively app.GotchasSimple simulators can't simulate and test installation-related abilities, such as display-mode related media queries, iOS web app meta tags, app shortcuts, or web share target.Apple simulators #Apple offers the Simulator app (formerly known as iOS Simulator) which allows you to test your web app on different iPhones and iPads on various operating system versions.The Simulator app is only available for macOS computers, and it comes with [Xcode, available in AppStore; it simulates iOS and iPadOS with different device configurations. It includes the real Mobile Safari app and the Web.app engine used when your PWA is installed on the home screen, so the final experience you see is fairly representative of an actual device.




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To launch the app, once you have installed Xcode, you can open the Simulator in the Xcode menu, by selecting Open Developer Tools then Simulator. Once in the simulator, you can open Safari as if you are in a real iPhone or iPad. You can open other devices by selecting File then Open Simulator menu.Some useful shortcuts for web developers while using Simulator to test PWAs are:Command-Shift-H: go to the Home screen.Control-Command-Shift-H: access the App Switcher.Command-Right and Command-Left: rotate the device.Simulator is not a virtual machine, but an app running on top of your macOS that looks like an iPhone or iPad, so it doesn't have its own TCP stack. Therefore, if you use localhost within Simulator, Safari will point to your macOS localhost device.By default, Xcode only installs the latest version of iOS, but you can go to Xcode, use the Preferences menu, and download older Simulators from the Components tab.It's good practice to test your PWA on the latest version of iOS, the previous minor version, and at least one previous major version.Android emulators #The Android ecosystem offers different emulators, but the ones available within the Android SDK are the most commonly used.As a PWA developer, you also need browsers in your Android emulator, which will add a layer of complexity to testing, because AOSP (Android Open Source Project) doesn't include Google Chrome or Play Store to download browsers. Therefore, not every Android emulator is helpful for PWA testing.The Android SDK comes with two tools useful for emulation:SDK Manager: downloads and updates different operating system versions and plugins.AVD Manager: adds, edits, and deletes Android Virtual Devices (AVDs), each of them representing one device with one Android OS installed, similar to a virtual machine instance.You can only install the Android SDK or Android Studio, a free IDE including the Android SDK with the emulators. With the SDK, you will have to use the command line to open and set up your emulators. With Android Studio, you can open the tools needed from the Welcome screen's menu. Once in the AVD Manager, you can create as many devices as you want, with different combinations of screen size, abilities, and Android OS version.CautionEach Android Virtual Device can take more than 5GB of your hard drive. Be mindful of that when creating images.CautionAndroid devices are virtual machines on top of your host computers, so they have their own TCP stacks. Therefore, localhost in an Android browser within an AVD won't be the same as your localhost in your host desktop computer. Later in this chapter, we will see how to solve this restriction with port forwarding.With an Android emulator, you can check your PWA installation support, the entire user experience, and if the abilities you are using are working as expected.Using Google Chrome #To use Google Chrome in the Android emulator, you have to create an AVD with Play Services inside. To do that, make sure the SDK you use for your AVD has the Play icon, as you can see in the following image: 041b061a72


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