Question

下面我发布了当前的 onRenderProcessGone 。

在if (!detail.didCrash()) {}实例变量＆＃34;视图＆＃34;保证为空，重新初始化它是安全的。我应该自己重新初始化它还是系统会这样做？

您是否可以指定应用程序如何继续执行的逻辑示例？如何更优雅地处理崩溃？

    @TargetApi(Build.VERSION_CODES.O)
    @Override
    public boolean onRenderProcessGone(WebView view, RenderProcessGoneDetail detail) {
        // WebViewClient.onRenderProcessGone was added in O.
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
            return false;
        }
        super.onRenderProcessGone(view, detail);

        if (!detail.didCrash()) {
            // Renderer was killed because the system ran out of memory.
            // The app can recover gracefully by creating a new WebView instance
            // in the foreground.
            Log.e("MY_APP", "System killed the WebView rendering process " +
                    "to reclaim memory. Recreating...");

            if (view != null) {
                ((ViewGroup)view.getParent()).removeView(view);
                view.destroy();
                view = null;
            }

            // By this point, the instance variable "view" is guaranteed
            // to be null, so it's safe to reinitialize it.

            return true; // The app continues executing.
        }

        // Renderer crashed because of an internal error, such as a memory
        // access violation.
        Log.e("MY_APP", "The WebView rendering process crashed!");

        // In this example, the app itself crashes after detecting that the
        // renderer crashed. If you choose to handle the crash more gracefully
        // and allow your app to continue executing, you should 1) destroy the
        // current WebView instance, 2) specify logic for how the app can
        // continue executing, and 3) return "true" instead.
        return false;
    }

Answer 1

我已经实现了此方法，并且在渲染器崩溃或被系统杀死之间没有区别。就应用程序而言，结果是相同的-Web视图不可用，并且如果此方法返回false，该应用程序也将被终止。

我维护对WebView的引用，以及在Fragment（活动）创建期间初始化的Fragment（或Activity）中的两个布局根视图。

        m_homeWebSwipe = v.findViewById(R.id.homeWebViewSwipe);
        m_homeWebView = v.findViewById(R.id.homeWebView);
        initializeWebView(m_homeWebView);

我的WebView是SwipeRefreshLayout的子级。布局XML并不重要，但作为参考，它是：

<?xml version="1.0" encoding="utf-8"?>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/homeWebViewSwipe"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <WebView
        android:id="@+id/homeWebView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </WebView>
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

这里的关键是WebView包含在视图根部的Layout容器中。

接收到onRenderProcessGone事件后，目标是重新创建一个包含新WebView的功能视图（它将与之关联一个新的渲染器进程）。

            @Override
            public boolean onRenderProcessGone(final WebView view, RenderProcessGoneDetail detail) {
                // Renderer was killed or died, recreate the webview
                Log.e("HomeWebView", "web content rendering process killed - resetting WebView: " + view.hashCode());

                // Only handle our WebView
                if (m_homeWebView.equals(view)) {
                    // Get the parent container of the inflated layout
                    ViewGroup container = (ViewGroup) m_homeWebSwipe.getParent();
                    ViewGroup.LayoutParams params = container.getLayoutParams();
                    // Remove the inflated view from the container and cleanup
                    // the dead webview specifically (if it is not GC'ed it will cause
                    // problems later, the next time the renderer dies)
                    container.removeView(m_homeWebSwipe);
                    m_homeWebSwipe = null;
                    m_homeWebView = null;
                    view.destroy();
                    // Reinflate the view layout and add it back into the container
                    View v = getLayoutInflater().inflate(R.layout.home_webview_screen, container, false);
                    m_homeWebSwipe = v.findViewById(R.id.homeWebViewSwipe);
                    m_homeWebView = v.findViewById(R.id.homeWebView);
                    // Initialise webview here, same as when it was originally created                    
                    initializeWebView(m_homeWebView);
                    assert(getActivity() != null);
                    getActivity().setContentView(v, params);
                    // reload the displayed page, or load a new page here
                    reloadPage();
                    return true; // The app continues executing.
                }
                return false; // the app is killed
            }

您可以通过安排WebView加载URL chrome：// crash

来测试onRenderProcessGone方法中的代码

onRenderProcessGone（WebView视图，RenderProcessGoneDetail详细信息）示例

1 个答案: