This snippet asks about the available viewport height and compares it with the device height to see if the URL bar is on the screen.
However, the process used by both Web apps and the browser is the same, so if we close the Chrome process it will also close all Web app sessions. There is no way to define the image to show on the recent app list; Chrome will take a snapshot of the app. If we are loading a file from a different domain it will alert the user of that situation adding a small URL bar at the top:.
This is particularly useful for OAuth login mechanism, so we can use Facebook Connect for example to log the user in without leaving our webapp context. From a webapp we can communicate with other native apps using standard Android Intent URLs, such as opening Maps or making a call. If you want to know more about this, check Chapter 15 of Programming the Mobile Web.
Chrome also keeps the current URL particularly useful for single page webapps between sessions, so if the user comes back to the webapp a year later it will keep it current state. Other difference appears when opening external links: by default on iOS any external HTML through elements will open in Safari and not inside the Web app context. Google Play Store compares the features your app requires to the features available on each user's device to determine whether your app is compatible with each device.
If the device does not provide all the features your app requires, the user cannot install your app. However, if your app's primary functionality does not require a device feature, you should set the required attribute to "false" and check for the device feature at runtime.
If the app feature is not available on the current device, gracefully degrade the corresponding app feature. For example, you can query whether a feature is available by calling hasSystemFeature like this:. For information about all the filters you can use to control the availability of your app to users through Google Play Store, see the Filters on Google Play document.
Note: Some system permissions implicitly require the availability of a device feature. For more information about implicitly required device features, read Permissions that Imply Feature Requirements.
Different devices may run different versions of the Android platform, such as Android 4. Each successive platform version often adds new APIs not available in the previous version.
For instance, Android 1. If your app cannot function without these APIs, you should declare API level 14 as your app's minimum supported version. The minSdkVersion attribute declares the minimum version with which your app is compatible and the targetSdkVersion attribute declares the highest version on which you've optimized your app. For more information about the build.
Each successive version of Android provides compatibility for apps that were built using the APIs from previous platform versions, so your app should always be compatible with future versions of Android while using the documented Android APIs.
Note: The targetSdkVersion attribute does not prevent your app from being installed on platform versions that are higher than the specified value, but it is important because it indicates to the system whether your app should inherit behavior changes in newer versions.
If you don't update the targetSdkVersion to the latest version, the system assumes that your app requires some backward-compatibility behaviors when running on the latest version. For example, among the behavior changes in Android 4. However, if your app uses APIs added in a more recent platform version, but does not require them for its primary functionality, you should check the API level at runtime and gracefully degrade the corresponding features when the API level is too low.
For example:. Android runs on devices of various sizes, from phones to tablets and TVs. In order to categorize devices by their screen type, Android defines two characteristics for each device: screen size the physical size of the screen and screen density the physical density of the pixels on the screen, known as DPI.
To simplify the different configurations, Android generalizes these variants into groups that make them easier to target:. By default, your app is compatible with all screen sizes and densities, because the system makes the appropriate adjustments to your UI layout and image resources as necessary for each screen. You should provide optimized bitmap images for common screen densities. You should also optimize the user experience by using flexible layouts as much as possible.
Where there are layouts for large configuration changes, such as portrait and landscape, or large versus small window sizes, consider providing alternate layouts that are flexible to smaller changes in the configuration.
This ensures good user experiences on different form factors such as tablets, phones, and foldables. It also helps when windows change size in multi-window mode. For information about how to create alternative resources for different screens and how to restrict your app to certain screen sizes when necessary, read the screen compatility overview and see the large screens app quality guidelines.
For instance, an app that displays train schedules for the London Underground is unlikely to be useful to users outside the United Kingdom. Filtering for technical compatibility such as required hardware components is always based on information contained within your APK or AAB file. But filtering for non-technical reasons such as geographic locale is always handled in the Google Play Console.
Content and code samples on this page are subject to the licenses described in the Content License. App Basics. Build your first app. App resources. Resource types. App manifest file.
Device compatibility. Multiple APK support. Tablets, large screens, and foldables. Build responsive UIs. Build for foldables. Getting started. Handling data. User input. Watch Face Studio. Health services. Creating watch faces. Android TV. Build TV Apps. Build TV playback apps.
Help users find content on TV. Recommend TV content. Watch Next. Build TV games. Build TV input services. TV Accessibility. Android for Cars. Build media apps for cars. Build navigation, parking, and charging apps for cars. Android Things.
Supported hardware. Advanced setup. Build apps. Create a Things app. Communicate with wireless devices. Configure devices. Interact with peripherals. Build user-space drivers. Manage devices. Create a build. Push an update. Chrome OS devices. App architecture. Architecture Components. UI layer libraries. Tap your profile image on the top right portion of the app.
From a web perspective, being web app capable means that our content will work properly when: There is no URL bar. Meta tags are areas in HTML code that contain information about a website.
The information cannot be seen on the website itself. Search engines access certain meta tags so they can, for instance, display a page title and description in the search results. You can specify what icon your app should use by including a tag in the of your page. PWAs are web applications. Here, web application simply means an app running as a website like, for example, Twitter. Without a doubt, Flutter, an SDK created specifically for multiplatform mobile application development, has many more features than PWA, which is based on web technologies.
Flutter apps have a deeper integration with the system and can take advantage of more native device features. PWAs are great to give a better experience to web visitors.
But if you want to send push notifications across iOS and Android, if you want to be on the app stores and give your users the experience they want from a mobile app, they might fall short of expectations. For instance, PWAs have no access to calendars, contacts, browser bookmarks, and alarms. PWA is a website, and we can use the standard web tools for testing, e. This new behavior matches what happens on Android when you install a PWA.
Open the website or web page you want to pin to your home screen. Tap the menu icon 3 dots in upper right-hand corner and tap Add to homescreen. Web applications are websites with functionality and interactive elements.
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