我以全屏模式播放YouTube视频，当我按“后退”按钮时，它将关闭该应用程序，而不是退出全屏模式。我正在使用 JavaScript和适用于Android的Cordova 6.3.1 。这是我的代码：
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
document.addEventListener("backbutton", function (e) {
e.preventDefault();
screen.orientation.lock('portrait');
}, false);
}
以前的代码无法正常工作。
谢谢。
答案 0 :(得分：1)
我还没有找到答案，但是到目前为止，我仍在发布我的发现，希望对大家有所帮助。
版本：cordova-android 8.1.0
问题来自以下事实：要全屏显示Youtube视频，SystemWebChromeClient会调用CordovaWebViewImpl.showCustomView()方法。这样，新视图似乎在Cordova能够onDispatchKeyEvent()并将backbutton事件发送到JavaScript端之前捕获了Back按钮事件。
这里是一些日志，为清楚起见添加了注释
// Video is fullscreen, and then dismissed with the onscreen minimize button
D/CordovaWebViewImpl: showCustomView : showing Custom View + view = android.widget.FrameLayout{a7cc344 V.E...... ......I. 0,0-0,0}
D/CordovaWebViewImpl: hideCustomView : Hiding Custom View : mCustomView = android.widget.FrameLayout{a7cc344 V.E...... .......D 0,0-1080,1704}
// While the video is not displayed fullscreen, the back button event is correctly caught and sent to the JS side
D/CordovaWebViewImpl: onDispatchKeyEvent : isBackButton = true mCustomView = null
// Once again in fullscreen, then click on the back button
D/CordovaWebViewImpl: showCustomView : showing Custom View + view = android.widget.FrameLayout{fa6d336 V.E...... ......I. 0,0-0,0}
// No back button event caught
// A destroy lifecycle event is sent (from the video FrameLayout handling?) and handleDestroy() is called
D/CordovaWebViewImpl: handleDestroy : load about:blank
D/CordovaWebViewImpl: >>> loadUrl(about:blank)
W/cr_AwContents: WebView.destroy() called while WebView is still attached to window.
D/CordovaWebViewImpl: hideCustomView : Hiding Custom View : mCustomView = android.widget.FrameLayout{a7cc344 V.E...... .......D 0,0-1080,1704}
FrameLayout的子类，并为其覆盖onKeyDown()和onKeyUp()，并在showCustomerView()中使用它视频不再显示。