## How to Fix Common WebView Issues: Blanking, CSS/HTML Not Updating, and Choppy Animations?

Troubleshooting WebView Issues: Blanking, CSS/HTML Changes Not Updating, and Choppy Animations

Android WebView, used to display web content within Android applications, can sometimes encounter rendering issues, CSS and HTML changes not being applied, and choppy animations. This article explores potential causes and solutions for these problems.

Hardware Acceleration

Ensure that hardware acceleration is enabled in your app's AndroidManifest.xml file. This optimizes the WebView's rendering performance.

<code class="xml"><application
   ...
   android:hardwareAccelerated="true"></code>

CSS Styling

Apply the following CSS style to body div (and potentially other elements) to improve rendering:

<code class="css">body div {
    -webkit-transform: translate3d(0,0,0);
}</code>

WebView Settings

Configure the WebView's settings as follows:

<code class="java">appView.getSettings().setRenderPriority(RenderPriority.HIGH);
appView.getSettings()
            .setPluginState(WebSettings.PluginState.ON_DEMAND);</code>

Force Redrawing

Consider extending the WebView class and overriding the onDraw method to force continuous redrawing:

<code class="java">@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    invalidate();
}</code>

Note

This redrawing method can drain the device's battery and should be implemented with caution.

Cordova Considerations

If using Cordova, these additional steps are necessary:

• In MainActivity, instruct Cordova to use your custom WebView class:

<code class="java">public void init(){
    CordovaWebView webView = new MyWebView(MainActivity.this);
    super.init(webView, new CordovaWebViewClient(this, webView), new CordovaChromeClient(this, webView));
}</code>

• In the most recent PhoneGap versions, adjust the init method:

<code class="java">public void init(){
    CordovaWebView webView = new MyWebView(MainActivity.this);
    super.init(webView, new IceCreamCordovaWebViewClient(this, webView), new CordovaChromeClient(this, webView));
}</code>

By following these solutions, you can optimize the performance of WebView and minimize issues with rendering, CSS changes, and animations. Remember to customize the implementation based on your specific circumstances.

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