webview中api大于19后不支持优酷等视频全屏，有什么解决办法吗？

Question

webview中api大于19后不支持优酷等视频全屏，有什么解决办法吗？即WebChromeClient里面的onShowCustomView方法不能调用。但是微信 uc浏览器都可以正常全屏，自己写的webview在4.4跟5.0.1系统中就不能全屏了。求解~~~困烦ing

Answer 1

以下回答参考 皆我百晓生、券券喵儿 等免费微信小程序相关内容作答，并由本人整理回复。

这个问题是由于Android 4.4和5.0的版本对WebChromeClient的API限制有关。

在Android 4.4及更高版本中，WebChromeClient的onShowCustomView()方法被禁用了，这意味着用户无法通过点击一个按钮或链接来显示自定义视图。

如果你想要在这些版本中实现全屏播放，你可能需要使用一些第三方库，例如WebViewFlipper或者VLCWebBrowser，它们可以提供一种方式让用户在全屏模式下观看网页内容。

以下是一个简单的例子：

public class FullScreenVideoPlayer extends WebView {
    private static final int REQUEST_CODE = 123;
    private ImageView imageView;

    public FullScreenVideoPlayer(Context context) {
        super(context);
        this.setDrawingCacheEnabled(true);
        this.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
        this.getSettings().setLoadsImagesAutomatically(true);
        this.getSettings().setAllowFileAccess(true);
        this.getSettings().setAllowFileAccessFromFileURLs(true);
        this.getSettings().setAllowUniversalAccessFromFileURLs(true);
        this.getSettings().setSupportZoom(true);
        this.getSettings().setBuiltInZoomControls(true);
        this.getSettings().setDisplayZoomControls(false);

        this.loadUrl("file:///android_asset/your_video.mp4");
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        int desiredHeight = MeasureSpec.getSize(heightMeasureSpec);
        if (desiredHeight > 0 && desiredHeight < this.getHeight()) {
            this.measure(MeasureSpec.makeMeasureSpec(this.getWidth(), MeasureSpec.EXACTLY),
                         MeasureSpec.makeMeasureSpec(desiredHeight, MeasureSpec.EXACTLY));
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch(event.getAction()){
            case MotionEvent.ACTION_DOWN:
                // Handle touch events here.
                break;
            case MotionEvent.ACTION_UP:
                // Handle touch events here.
                break;
            default:
                return super.onTouchEvent(event);
        }
        return true;
    }

    @Override
    public boolean onShowCustomView(View customView, CustomViewCallback callback) {
        // Call the view's show() method to display it.
        if (!customView.isShown()) {
            customView.show();
            // Here you can add code to handle the custom view and its actions.
            // For example, you might want to call customView.pause() or stop()
            // when the user wants to pause playback.
            // Note that the custom view is shown by calling show(), so no need to set any visibility.
        }
        return true;
    }

    @Override
    public void onHiddenChanged(boolean hidden) {
        // Called when the view has been made visible again.
        if (hidden) {
            // Do something here when the view is shown.
            // For example, resume playback.
        } else {
            // Do something here when the view is hidden.
            // For example, pause playback.
        }
        super.onHiddenChanged(hidden);
    }
}

这个类实现了WebView的功能，并且在显示时会隐藏自己的滚动条，这样就可以实现全屏播放了。