# Android-WebView中全屏问题

## 问题详述：

使用WebView加载SaaS-H5观看页时，点击全屏按钮无反应

## 解决方案：

1. WebSettings配置需要添加webSettings.setUseWideViewPort(true);
2. 处理自定义WebChromeClient

   ```java
   public class WVChromeClient extends WebChromeClient {
       private Context _context;
       private AndroidWebViewActivity _m;
       public WVChromeClient(Context context, AndroidWebViewActivity mainActivity)
       {
           _context = context;
           _m = mainActivity;
       }

       @Override
       public void onProgressChanged(WebView view, int newProgress) {
           super.onProgressChanged(view, newProgress);
           Log.d("MainActivity","newProgress："+ newProgress );
       }

       @Nullable
       @Override
       public Bitmap getDefaultVideoPoster() {
           return Bitmap.createBitmap(10, 10, Bitmap.Config.ARGB_8888);
       }

       @Override
       public void onShowCustomView(View view, CustomViewCallback callback) {
           _m.showCustomView(view ,callback);
       }

       @Override
       public void onHideCustomView() {
           _m.hideCustomView();
       }
   }
   ```
3. 处理全屏，退出全屏

   ```java
   /** 视频全屏参数 */
       protected static final FrameLayout.LayoutParams COVER_SCREEN_PARAMS = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);
       private View customView;
       private FrameLayout fullscreenContainer;
       private WebChromeClient.CustomViewCallback customViewCallback;
       /** 视频播放全屏 **/
       public void showCustomView(View view, WebChromeClient.CustomViewCallback callback) {
           // if a view already exists then immediately terminate the new one
           if (customView != null) {
               callback.onCustomViewHidden();
               return;
           }
           setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
           AndroidWebViewActivity.this.getWindow().getDecorView();

           FrameLayout decor = (FrameLayout) getWindow().getDecorView();
           fullscreenContainer = new FullscreenHolder(AndroidWebViewActivity.this);
           fullscreenContainer.addView(view, COVER_SCREEN_PARAMS);
           decor.addView(fullscreenContainer, COVER_SCREEN_PARAMS);
           customView = view;
           setStatusBarVisibility(false);
           customViewCallback = callback;
       }

       /** 隐藏视频全屏 */
       public void hideCustomView() {
           if (customView == null) {
               return;
           }
           setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
           setStatusBarVisibility(true);
           FrameLayout decor = (FrameLayout) getWindow().getDecorView();
           decor.removeView(fullscreenContainer);
           fullscreenContainer = null;
           customView = null;
           customViewCallback.onCustomViewHidden();
           webView.setVisibility(View.VISIBLE);
       }

       /** 全屏容器界面 */
       static class FullscreenHolder extends FrameLayout {

           public FullscreenHolder(Context ctx) {
               super(ctx);
               setBackgroundColor(ctx.getResources().getColor(android.R.color.black));
           }

           @Override
           public boolean onTouchEvent(MotionEvent evt) {
               return true;
           }
       }

       private void setStatusBarVisibility(boolean visible) {
           int flag = visible ? 0 : WindowManager.LayoutParams.FLAG_FULLSCREEN;
           getWindow().setFlags(flag, WindowManager.LayoutParams.FLAG_FULLSCREEN);
       }

       @Override
       public boolean onKeyUp(int keyCode, KeyEvent event) {
           switch (keyCode) {
               case KeyEvent.KEYCODE_BACK:
                   /** 回退键 事件处理 优先级:视频播放全屏-网页回退-关闭页面 */
                   if (customView != null) {
                       hideCustomView();
                   } else if (webView.canGoBack()) {
                       webView.goBack();
                   } else {
                       finish();
                   }
                   return true;
               default:
                   return super.onKeyUp(keyCode, event);
           }
       }
   ```
4. Manifest中配置activity属性

   ```java
   <activity android:name=".AndroidWebViewActivity"
               android:configChanges="keyboardHidden|orientation|screenSize"/>
   ```


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