But there are limited set of capabilities that the WebViews come with.

One of the main things that bothered us was the caching limitations and inconsistency. Cache control headers were not respected across multiple app launches. Also, loading a web asset CSS, JS etc even the first launch assuming caching works well of the WebView is also a costly operation in case of 2G networks.

There are still a sizeable number of users in 2G and slow networks, especially in countries like India. If we have a mechanism to load these instantaneously without making a network call to fetch them, it will make the WebView load much faster. Many times, in case of checkout related WebViews, there are multiple images which get displayed. Many WebViews use the same fonts across native and WebViews to have a consistent look.

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We can actually build capability in the WebView to load the images from device cache and load fonts from the already bundled fonts instead of loading these from the network. WebViewClient provided by Android has this magical method called shouldInterceptRequest , which can be overridden. What it basically allows you to do is intercept any request to fetch HTML, CSS, JS, images, fonts etc going from the WebView and gives you the ability to take some actions before network calls are made.

Read more about it in Android Developers site. All you need to explicitly create appropriate WebResourceResponse is MIME type, encoding format and input stream can be created from assets or files of the resource. Sample code to create a WebResourceResponse:. Once we realised that we can to this, we went ahead and bundled all CSS, JS and stripes yes, it did increase our APK size by around kb which we were using in our WebViews, also created a mapping file which maps urls to local assets.

Android Loading Spinner

You can create a gradle task to automate this process of bundling and creating a mapping file. All the requests going from WebView are intercepted and we check if we have any local asset for the url intercepted. If so, we create a WebResourceResponse using it and return instead of making a network call. Along with this we had a common font which is being used in both native and WebViews, we started loading these fonts also from bundled fonts instead of making a network call to get these.

Loading bar and Loading Spinner.

WebView with loader in android example - phon-er.com

In this chapter we will discuss spinner. Spinner is used to display progress of those tasks whose total time of completion is unknown. In order to use that, you just need to define it in the xml like this. After defining it in xml, you have to get its reference in java file through ProgressBar class. After that you can make its disappear , and bring it back when needed through setVisibility Method.

Apart from these Methods, there are other methods defined in the ProgressBar class , that you can use to handle spinner more effectively. For more information, see this guide. You can attach javascript functions and use them within the mobile webpages as described here in the official docs. If you wish to enable the page to load with responsive layouts, you need to set it explicitly:.

Android - Loading Spinner

In case you want to store a copy of a webpage locally to be loaded into a WebView , you can put it in the android assets folder. Place the html, css, js, etc in this folder. For example, say I wanted to load a page entitled index. Setting dismis in the latter is convenient since your user won't have to wait for the whole page to load to proceed.