先上代码吧

public class MainActivity extends AppCompatActivity {

    static final String iframeStr = "<iframe frameborder=\"0\" width=\"640\" height=\"498\" src=\"http://v.qq.com/iframe/player.html?vid=v0151eygqka&tiny=0&auto=0\" allowfullscreen></iframe>";
    private WebView videoWebView;
    private FrameLayout fullScreenView;
    private View customView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        fullScreenView = (FrameLayout) findViewById(R.id.video_fullscreen);
        videoWebView = (WebView) findViewById(R.id.webView);
        WebSettings settings = videoWebView.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setJavaScriptCanOpenWindowsAutomatically(true);
        settings.setDatabaseEnabled(true);
        settings.setAppCacheEnabled(true);
        settings.setCacheMode(WebSettings.LOAD_DEFAULT);
        settings.setPluginState(WebSettings.PluginState.ON);
        settings.setAllowFileAccess(true);
        settings.setLoadWithOverviewMode(true);
        settings.setDomStorageEnabled(true);
        settings.setUseWideViewPort(true);

        videoWebView.setWebChromeClient(new MyWebChromeClient());
        videoWebView.setWebViewClient(new MyWebViewClient());

        videoWebView.loadData(iframeStr,"text/html","utf-8");
    }

    class MyWebViewClient extends WebViewClient{
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            return false;
        }
    }

    class MyWebChromeClient extends WebChromeClient{

        private CustomViewCallback customViewCallback;
        @Override
        public void onShowCustomView(View view, CustomViewCallback callback) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            videoWebView.setVisibility(View.INVISIBLE);
            // 如果一个视图已经存在，那么立刻终止并新建一个
            if (customView != null) {
                callback.onCustomViewHidden();
                return;
            }
            fullScreenView.addView(view);
            customView = view;
            customViewCallback = callback;
            fullScreenView.setVisibility(View.VISIBLE);
        }

        @Override
        public void onHideCustomView() {
            if (customView == null)// 不是全屏播放状态
                return;
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            customView.setVisibility(View.GONE);
            fullScreenView.removeView(customView);
            customView = null;
            fullScreenView.setVisibility(View.GONE);
            customViewCallback.onCustomViewHidden();
            videoWebView.setVisibility(View.VISIBLE);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (getRequestedOrientation() != ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        }
        videoWebView.resumeTimers();
    }

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

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

就是用一个webview显示一个视频（不是一个视频网页，只是一个视频）,然后我使用的是iframe的链接（就是腾讯视频分享那里的通用代码）。我参照了网上很多关于全屏显示的问题，基本代码都是这样，但是并没有用，感觉没有调用到那两个函数。还有是不是跟链接里限定了大小有关系。这样的话，需要修改什么才能全屏呢？