SteamTools/System.Common.ClientLib.Droid/Extensions/WebViewExtensions.cs

using Android.OS;
using Android.Views;
using Android.Webkit;
using System.Common;

// ReSharper disable once CheckNamespace
namespace System
{
    /// <summary>
    /// 对 <see cref="WebView"/> 类的扩展函数集
    /// </summary>
    public static class WebViewExtensions
    {
        /// <summary>
        /// 使用此函数代替 <see cref="WebView.Destroy"/>
        /// </summary>
        /// <param name="webView"></param>
        public static bool Destroy_(this WebView? webView)
        {
            if (webView != null)
            {
                webView.StopLoading(); // 停止加载
                if (webView.Settings != null)
                    webView.Settings.JavaScriptEnabled = false; // 禁用JS
                webView.ClearHistory(); //清除历史记录
                webView.RemoveAllViews();
                var parent = webView.Parent;
                if (parent is ViewGroup group)
                    group.RemoveView(webView); // 移除WebView
                webView.Destroy(); // 销毁VebView
                return true;
            }
            return false;
        }

        /// <summary>
        /// 在 <see cref="WebView"/> 初始化中优化
        /// </summary>
        /// <param name="webView"></param>
        /// <param name="isHtmlOnly">是否仅加载HTML内容</param>
        public static void InitOptimize(this WebView webView, bool isHtmlOnly = true)
        {
            if (webView.Settings != null)
            {
                webView.Settings.SetRenderPriority(WebSettings.RenderPriority.High);
                webView.Settings.BuiltInZoomControls = false;
                webView.Settings.SetSupportZoom(false);
                webView.Settings.DisplayZoomControls = false;
                webView.Settings.BlockNetworkImage = isHtmlOnly;
                webView.Settings.JavaScriptEnabled = !isHtmlOnly;
            }
            if (Build.VERSION.SdkInt < BuildVersionCodes.M)
            {
#pragma warning disable CS0618 // 类型或成员已过时
                webView.SetHorizontalScrollbarOverlay(false);
                webView.SetVerticalScrollbarOverlay(false);
#pragma warning restore CS0618 // 类型或成员已过时
            }
        }

        /// <summary>
        /// 加载 HTML 字符串
        /// </summary>
        /// <param name="webView"></param>
        /// <param name="htmlString"></param>
        public static void LoadHtmlString(this WebView webView, string htmlString)
        {
            webView.LoadDataWithBaseURL(
                baseUrl: null,
                data: htmlString,
                mimeType: MediaTypeNames.HTML,
                encoding: Constants.UTF8,
                historyUrl: null);
        }
    }
}