Android WebView HTML Video full screen

gistfile1.txt

<FrameLayout
 android:id="@+id/main_content"
 android:layout_width="match_parent"
 android:layout_height="300dip" >
 
<WebView
  android:id="@+id/webview"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />
  
</FrameLayout>

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

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 
    WebView mWebView = (WebView) findViewById(R.id.webview);
    mClient = new MyChromeClient();
    mWebView.setWebChromeClient(mClient);
    mWebView.loadUrl("file:///android_asset/test.html");
 
    mContentView = (FrameLayout) findViewById(R.id.main_content);
    mTargetView = (FrameLayout)findViewById(R.id.targetview);
}

@Override
public void onBackPressed(){
    if (mCustomView != null){
        mClient.onHideCustomView();
    }else{
        finish();
    }
}

class MyChromeClient extends WebChromeClient {
 
    @Override
    public void onShowCustomView(View view, CustomViewCallback callback) {
        mCustomViewCallback = callback;
        mTargetView.addView(view);
        mCustomView = view;
        mContentView.setVisibility(View.GONE);
        mTargetView.setVisibility(View.VISIBLE);
        mTargetView.bringToFront();
    }
 
    @Override
    public void onHideCustomView() {
        if (mCustomView == null)
            return;
 
        mCustomView.setVisibility(View.GONE);
        mTargetView.removeView(mCustomView);
        mCustomView = null;
        mTargetView.setVisibility(View.GONE);
        mCustomViewCallback.onCustomViewHidden();
        mContentView.setVisibility(View.VISIBLE);
    }
}