Flutter webview 安卓端无法访问http资源

sdk: webview_flutter: ^3.0.0

https下官方没有提供http混合访问的接口, 只能强行实现.

1. 将 webview_flutter_android库拷贝到本地
2. 修改文件 WebSettingsHostApiImpl.java

  @Override
  public void create(Long instanceId, Long webViewInstanceId) {
    final WebView webView = (WebView) instanceManager.getInstance(webViewInstanceId);
    instanceManager.addInstance(webSettingsCreator.createWebSettings(webView), instanceId);

  /// 添加如下代码
    final WebSettings webSettings = (WebSettings) instanceManager.getInstance(instanceId);
    webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
  }

3. 添加本地依赖

dependency_overrides:
  # 官方库不允许http访问
  webview_flutter_android:
    path: '../webview_flutter_android-2.8.0'