maui：导航到新页面

Question

播放音频，当我导航到新页面时，音频停止播放。我想在导航到新页面或切换应用程序或锁定设备时在后台播放音频。 我的代码：

<WebView
    x:Name="audio_webview" 
    BackgroundColor="Transparent" 
    Navigated="OnWebViewNavigated"
    HorizontalOptions="FillAndExpand"
    VerticalOptions="CenterAndExpand" >
    <WebView.HeightRequest>
        <OnIdiom x:TypeArguments="x:Double">
            <OnIdiom.Phone>80</OnIdiom.Phone>
            <OnIdiom.Tablet>120</OnIdiom.Tablet>
            <OnIdiom.Desktop>80</OnIdiom.Desktop>
        </OnIdiom>
    </WebView.HeightRequest>
    <WebView.WidthRequest>
        <OnIdiom x:TypeArguments="x:Double">
            <OnIdiom.Phone>420</OnIdiom.Phone>
            <OnIdiom.Tablet>630</OnIdiom.Tablet>
            <OnIdiom.Desktop>420</OnIdiom.Desktop>
        </OnIdiom>
    </WebView.WidthRequest>
</WebView>

audio_webview.Source = audioUrl;

当我导航到一个新页面时，我在输出框中获得以下消息：

11:04:37:012    [AAudio] AAudioStream_requestStop(s#1) called
11:04:37:012    [AAudio] AAudioStream_close(s#1) called ---------------
11:04:37:012    [AAudioStream] setState(s#1) from 10 to 11
11:04:37:012    [AudioTrack] stop(portId:2774, sessionId:48889): 0xb400006eb01c3f40, prior state:STATE_STOPPED
11:04:37:012    [AudioTrackShared] this(0xb400006e500b8550), mCblk(0x6d7fcdc000), front(311736), mIsOut 1, interrupt() FUTEX_WAKE
11:04:37:012    [AudioTrack] requestExitAndWait start
11:04:37:012    [AudioTrack] requestExitAndWait end
11:04:37:012    [AudioTrack] stopAndJoinCallbacks(2774) done
11:04:37:012    [AudioTrack] ~AudioTrack(2774): 0xb400006eb01c3f40
11:04:37:072    [AudioTrack] getpackName client name com.companyname.appname(24146)
11:04:37:072    [AudioTrack] stop(portId:2774, sessionId:48889): 0xb400006eb01c3f40, prior state:STATE_STOPPED
11:04:37:072    [AudioTrack] stopAndJoinCallbacks(2774) done
11:04:37:072    [AAudioStream] setState(s#1) from 11 to 12
11:04:37:072    [AAudioStream] ~AudioStream(s#1) mPlayerBase strongCount = 2
11:04:37:072    [AAudio] AAudioStream_close(s#1) returned 0 ---------

我想在打开新页面时在背景中播放音频而不会暂停。此功能在iOS平台上工作正常，但是在Android中，只有音频暂停。
    

您可以在自定义处理程序中覆盖OnWindowVisibilychanged方法：

namespace ProjectName.Platforms.Android
{
    public class MyWebView : MauiWebView
    {
        public MyWebView(WebViewHandler handler, Context context) : base(handler, context)
        {
        }
        protected override void OnWindowVisibilityChanged([GeneratedEnum] ViewStates visibility)
        {
            if(visibility != ViewStates.Gone)
            {
                base.OnWindowVisibilityChanged(visibility);
            }
        }
    }
    public class MyHandler : WebViewHandler
    {
        protected override global::Android.Webkit.WebView CreatePlatformView()
        {
            var platformView = new MyWebView(this, Context!)
            {
                LayoutParameters = new LayoutParams(LayoutParams.MatchParent, LayoutParams.MatchParent)
            };

            platformView.Settings.JavaScriptEnabled = true;
            platformView.Settings.DomStorageEnabled = true;
            platformView.Settings.SetSupportMultipleWindows(true);

            return platformView;
        }
    }
}

然后使用自定义处理程序：

Answer 1