**Why is My Android WebView Displaying Blank Screens, Failing to Apply CSS, and Experiencing Choppy Animations?**

Android WebView Problems: Blank Screens, CSS Failures, and Choppy Animations

Introduction

Android WebView can exhibit various issues, including blank screens, unresponsive CSS changes, and choppy animations, hindering its effectiveness for displaying web content within Android apps. This article explores the causes and potential solutions to these problems.

Causes and Solutions

1. Hardware Acceleration and Minimum SDK

Ensure hardware acceleration is enabled in the AndroidManifest.xml file and that the minimum supported API specified in the manifest matches the API version you are using. This improves the rendering performance of the WebView.

2. CSS Transformation and Force Redraw

Apply the CSS transform "-webkit-transform: translate3d(0,0,0)" to all elements in your primary CSS file. This brute-force approach has demonstrated effectiveness in resolving these issues.

3. WebSettings Optimization

When instantiating the WebView, set the "RenderPriority" to "HIGH" and the "PluginState" to "ON_DEMAND" to optimize its rendering and loading behavior.

4. Force Redrawing using Invalidates

Extend the CordovaWebView class and override the "onDraw" method to periodically call "invalidate()". This forces the WebView to redraw constantly, ensuring responsive CSS changes. However, use this approach judiciously to avoid draining the device's battery.

5. CordovapWebView Integration (Cordova/PhoneGap Users Only)

In your MainActivity, use your modified WebView class ("MyWebView") instead of the default CordovaWebView. This ensures that the app uses your optimized WebView implementation.

Additional Notes

• For Android 4.4 users, consider using the "CrossWalk" WebView replacement for improved performance.
• The "invalidate()" solution may no longer be necessary in Android 4.4 , but it can be used as a last resort.
• Adjust the solutions based on your specific situation and the results you observe.

Community Collaboration

This answer is shared as a "community wiki," encouraging contributions and optimization suggestions from the community. Please share your experiences and knowledge to enhance this solution for the benefit of all Android WebView users.

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