最近做项目遇到webview加载视频 全屏，下载，https问题 特此总结了一下

Screenshot_2017-01-09-15-39-16.png

Screenshot_2017-01-09-15-39-22.png

1.在layout文件里放入一个WebView控件和一个显示视频控件

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/content_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <FrameLayout
        android:id="@+id/video_fullView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:visibility="gone" />

    <WebView
        android:id="@+id/webview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</RelativeLayout>

2.声明

   private FrameLayout video_fullView;
    private View xCustomView;
    private WebView webView;
    private myWebChromeClient xwebchromeclient;
    private WebChromeClient.CustomViewCallback xCustomViewCallback;
    private String url = "https://gyxb.hbwwcc.com/wsxb/business/knowledge_view2.htm?knowledgeId=20150727133126394209&userId=USER_20161129095011349993";

      @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activityt_webview);
        initView();
        initWebViewSettings();
        initWebView();
    }

实例化控件

  private void initView() {
        video_fullView = (FrameLayout) findViewById(R.id.video_fullView);
        webView = (WebView) findViewById(R.id.webview);
    }
   /**
     * 初始化网络数据
     */
    private void initWebView() {
        webView.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                view.loadUrl(url);
                return true;
            }

            public void onReceivedError(WebView view, int errorCode,
                                        String description, String failingUrl) {
                System.out.println("网络连接失败 ,请检查网络！");
            }

            @Override
            public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) {
                handler.proceed();  // 接受所有网站的证书 加载https网址时需加上这句 否则会出现空白现象
                System.out.println("onReceivedSslError======" + error);
            }

            @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
            }

            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon) {
                super.onPageStarted(view, url, favicon);
            }
        });
        webView.loadUrl(url);
        webView.setDownloadListener(new MyWebViewDownLoadListener(this));//点击链接下载文档，，
        xwebchromeclient = new myWebChromeClient();
        webView.setWebChromeClient(xwebchromeclient);
    }

  /**
 * 初始化网络设置
 */
private void initWebViewSettings() {
    WebSettings webSettings = webView.getSettings();
    webSettings.setJavaScriptEnabled(true);//设置支持页面js可用
    webSettings.setBuiltInZoomControls(true);
    webSettings.setUseWideViewPort(true);// 可任意比例缩放
    webSettings.setLoadWithOverviewMode(true);// setUseWideViewPort方法设置webview推荐使用的窗口。setLoadWithOverviewMode方法是设置webview加载的页面的模式。
    webSettings.setSavePassword(true);
    webSettings.setDomStorageEnabled(true);
    webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
    //设置下4.4以上的webview，允许加载混合内容,https加载时候需加上这行代码
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);
    }
}

     public class myWebChromeClient extends WebChromeClient {
        private View xprogressvideo;

        // 播放网络视频时全屏会被调用的方法
        @Override
        public void onShowCustomView(View view, CustomViewCallback callback) {
       
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            webView.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 (xCustomView != null) {
                callback.onCustomViewHidden();
                return;
            }
            video_fullView.addView(view);
            xCustomView = view;
            xCustomViewCallback = callback;
            video_fullView.setVisibility(View.VISIBLE);

        }

        // 视频播放退出全屏会被调用的
        @Override
        public void onHideCustomView() {
            if (xCustomView == null)// 不是全屏播放状态
                return;
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
            xCustomView.setVisibility(View.GONE);
            video_fullView.removeView(xCustomView);
            xCustomView = null;
            video_fullView.setVisibility(View.GONE);
            xCustomViewCallback.onCustomViewHidden();
            webView.setVisibility(View.VISIBLE);

        }

        // 视频加载时进程loading
        @Override
        public View getVideoLoadingProgressView() {
            return xprogressvideo;
        }
    }

```

  /**
 * 判断是否是全屏
 *
 * @return
 */
public boolean inCustomView() {
    return (xCustomView != null);
}

/**
 * 全屏时按返加键执行退出全屏方法
 */
public void hideCustomView() {
    xwebchromeclient.onHideCustomView();
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
protected void onResume() {
    super.onResume();
    System.out.println("onResume()===== ");
    try {
        webView.getClass().getMethod("onResume").invoke(webView, (Object[]) null);
    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
        e.printStackTrace();
    }

    /**
     * 设置为横屏
     */
    if (getRequestedOrientation() != ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
}

/**
* 点击返回键时候 判断是否全屏播放视频 
*/

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK)) {
        if (inCustomView()) {
            // webViewDetails.loadUrl("about:blank");
            hideCustomView();
            return true;
        } else if (webView.canGoBack()) {
            webView.goBack(); // goBack()表示返回WebView的上一页面
            return true;
        } else {
            finish();
        }
    }
    return super.onKeyDown(keyCode, event);
}

@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
protected void onPause() {
    System.out.println("onPause()===== ");
    try {
        webView.getClass().getMethod("onPause").invoke(webView, (Object[]) null);
    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
        e.printStackTrace();
    }
    super.onPause();
}

```

  /**
     * webView下载类
     */
    public class MyWebViewDownLoadListener implements DownloadListener {
    
    private Context mContext;
    
    public MyWebViewDownLoadListener(Context mContext){
        this.mContext=mContext;
    }
    @Override
    public void onDownloadStart(String url, String userAgent,
                                String contentDisposition, String mimetype, long contentLength) {

        Uri uri = Uri.parse(url);
        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
        mContext.startActivity(intent);
    }
}

//解决图片 过大显示问题 从新定义宽高 
private void imgReset() {
        progress_web.loadUrl("javascript:(function(){"
                + "var objs = document.getElementsByTagName('img'); "
                + "for(var i=0;i<objs.length;i++)  " + "{"
                + "var img = objs[i];   "
                + "    img.style.width = '100%';   "
                + "    img.style.height = 'auto';   "
                + "}" + "})()");
    }
  @Override
            public void onPageFinished(WebView view, String url) {
                super.onPageFinished(view, url);
                imgReset();
            }