安卓WebView的视频组件全屏播放

参考：(61条消息) Android WebView Video完全详解（第一篇）-Android开发人员_HarmonyOS Developer的博客-CSDN博客_webview video

前言：通常富文本是可能同时含图片和视频的，普通的富文本组件可能无法满足了，这时使用WebView可以解决。

使用：
不在布局中创建webview而是在代码中创建

//初始化
WebView wv = new WebView(this.context);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
    LinearLayout.LayoutParams.MATCH_PARENT,
    LinearLayout.LayoutParams.WRAP_CONTENT
);
lp.leftMargin = AutoSizeUtils.dp2px(this.context,10f);
lp.rightMargin = AutoSizeUtils.dp2px(this.context,10f);
wv.setLayoutParams(lp);
setUpWebViewDefaults(wv);
setChromeClient(wv);
//这里entity.getTitle()就是你要放入的富文本
wv.loadDataWithBaseURL(null, entity.getTitle(), "text/html", "utf-8", null);
wv.setWebViewClient(new WebViewClient(){
        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            mWaitDialog.dismiss();
        }
});
llHtml.addView(wv);

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setUpWebViewDefaults(WebView webView) {
        WebSettings settings = webView.getSettings();

        // Enable Javascript
        settings.setJavaScriptEnabled(true);

        // Use WideViewport and Zoom out if there is no viewport defined
        settings.setUseWideViewPort(false); //原文模式
        settings.setLoadWithOverviewMode(true);

        // Enable pinch to zoom without the zoom buttons
        settings.setBuiltInZoomControls(false);

        // Allow use of Local Storage
        settings.setDomStorageEnabled(true);

        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.HONEYCOMB) {
            // Hide the zoom controls for HONEYCOMB+
            settings.setDisplayZoomControls(false);
        }

        // Enable remote debugging via chrome://inspect
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            WebView.setWebContentsDebuggingEnabled(true);
        }

        webView.setWebViewClient(new WebViewClient());
}

//getDefaultVideoPoster该方法中有一个可以更换安卓视频组件视频默认图的方法，自己尝试了以下但是没用。
void setChromeClient(WebView mWebView) {
        mWebView.setWebChromeClient(new WebChromeClient() {

            private Bitmap xdefaltvideo;

            @Override
            public Bitmap getDefaultVideoPoster() { //这个地方是加载h5的视频列表 默认图   点击前的视频图
//                if (this == null) {
//                    return null;
//                }

//                return BitmapFactory.decodeResource(activity.getApplicationContext().getResources(),
//                        R.mipmap.ic_launcher);

                if (xdefaltvideo == null) {
                    xdefaltvideo = BitmapFactory.decodeResource(
                            activity.getResources(), R.mipmap.ic_launcher);
                }
                return xdefaltvideo;
            }

            @Override
            public void onShowCustomView(View view,
                                         WebChromeClient.CustomViewCallback callback) {
                // if a view already exists then immediately terminate the new one
                if (mCustomView != null) {
                    onHideCustomView();
                    return;
                }

                // 1. Stash the current state
                mCustomView = view;
                mOriginalSystemUiVisibility = activity.getWindow().getDecorView().getSystemUiVisibility();
                mOriginalOrientation = activity.getRequestedOrientation();

                // 2. Stash the custom view callback
                mCustomViewCallback = callback;

                // 3. Add the custom view to the view hierarchy
                FrameLayout decor = (FrameLayout) activity.getWindow().getDecorView();
                decor.addView(mCustomView, new FrameLayout.LayoutParams(
                        ViewGroup.LayoutParams.MATCH_PARENT,
                        ViewGroup.LayoutParams.MATCH_PARENT));


                // 4. Change the state of the window
                activity.getWindow().getDecorView().setSystemUiVisibility(
                        View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
                                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
                                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN |
                                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                                View.SYSTEM_UI_FLAG_FULLSCREEN |
                                View.SYSTEM_UI_FLAG_IMMERSIVE);
                activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            }

            @Override
            public void onHideCustomView() {
                // 1. Remove the custom view
                FrameLayout decor = (FrameLayout) activity.getWindow().getDecorView();
                decor.removeView(mCustomView);
                mCustomView = null;

                // 2. Restore the state to it's original form
                activity.getWindow().getDecorView()
                        .setSystemUiVisibility(mOriginalSystemUiVisibility);
                activity.setRequestedOrientation(mOriginalOrientation);

                // 3. Call the custom view callback
                mCustomViewCallback.onCustomViewHidden();
                mCustomViewCallback = null;
            }
        });
}