android - 关闭从 WebView 打开的全屏视频后出现白屏

Question

我有一个嵌入了 youtube 视频的 WebView。我已经使用像这样的简单对话框解决方案实现了全屏模式:

webView.setWebChromeClient(new CustomWebChromeClient());

public class CustomWebChromeClient extends WebChromeClient {
    @Override
    public void onShowCustomView(View view, CustomViewCallback callback) {
        Dialog dialog = new Dialog(ArticleDetailsActivity.this, android.R.style.Theme_Black_NoTitleBar_Fullscreen);
        view.setBackgroundColor(getResources().getColor(R.color.black));
        dialog.setContentView(view);
        dialog.show();
    }

    @Override
    public void onHideCustomView() {
        super.onHideCustomView();
    }
}

除了使用后退按钮关闭视频的那一刻外，它工作得很好，因为然后全屏视频消失并且白色全屏覆盖层停留在屏幕上，直到另一个后退按钮使用。我试图变得聪明，并在 onHideCustomView() 中执行了 onBackPressed()，但随后整个 Activity 都完成了。

如何摆脱那个白色的窗帘？

Answer 1

深入研究了 android 代码并找到了解决方案:

    public class CustomWebChromeClient extends WebChromeClient {

    @Override
    public void onShowCustomView(View view, final CustomViewCallback callback) {
        Dialog dialog = new Dialog(ArticleDetailsActivity.this, android.R.style.Theme_Black_NoTitleBar_Fullscreen);
        view.setBackgroundColor(getResources().getColor(R.color.black));
        dialog.setContentView(view);
        dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
            @Override
            public void onDismiss(DialogInterface dialog) {
                callback.onCustomViewHidden();
                chromeWebClient.onHideCustomView();
            }
        });
        dialog.show();
    }

    @Override
    public void onHideCustomView() {
        super.onHideCustomView();
    }
}

相关问题 - 已解决:原来当重新打开 Activity 并再次播放视频时 HTML5VideoView.reprepareData 或调用 webView.onPause() 时 HTML5VideoView.isPlaying 有时会崩溃这似乎是另一个问题......

最后的说明

为了 WebView 正常工作并且不泄漏内存，您应该在 Activity 或 Fragment 生命周期回调中调用相应的 WebViewMethods，如下所示 Activity(可能与 Fragment 有点相似):

@Override
protected void onCreate(Bundle savedInstanceState) {
    if (savedInstanceState == null) {
        webView.restoreState(savedInstanceState);
    } 
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putBoolean(BundleKeys.HAS_PHOTOS, hasPhotos);
    outState.putLong(BundleKeys.ARTICLE_ID, articleId);
    webView.saveState(outState);
}

@Override
protected void onResume() {
    webView.onResume();
}

@Override
protected void onPause() {
    super.onPause();
    webView.onPause();
}

@Override
protected void onStop() {
    super.onStop();
    webView.stopLoading();
}

@Override
protected void onDestroy() {
    super.onDestroy();
    webView.destroy();
}