title: How to change background in webview
body: <p>I have created two themes for my activity; Bright/Dark. But when i trigger change in theme, color of webpage loaded in the webview doesn't change.</p>
  
  <p>I have tried this <code>myWebView.setBackgroundColor(Color.TRANSPARENT);</code>
  but it doesn't make any difference. So, how would i go about this?</p>
  
  <p>Here is my layout please have a look;</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:ads="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"&gt;   
  
      &lt;LinearLayout
          xmlns:night="http://schemas.android.com/apk/res-auto"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:orientation="vertical"
          android:background="@color/ColorPrimary"
          night:night_background="@color/colorPrimary_n"
          tools:ignore="MissingPrefix"&gt;
  
          &lt;ProgressBar
              android:id="@+id/progressBar3"
              style="?android:attr/progressBarStyleHorizontal"
              android:layout_width="fill_parent"
              android:layout_height="3dp"
              android:max="100"
              android:progressDrawable="@drawable/greenprogress"
              /&gt;
  
          &lt;android.support.v4.widget.SwipeRefreshLayout
              xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/swiperefresh"
              android:layout_width="match_parent"
              android:layout_height="match_parent"&gt;
              &lt;WebView
                  xmlns:android="http://schemas.android.com/apk/res/android"
                  android:id="@+id/webViewTop"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
                  night:night_background="@color/colorPrimary_n"
                  android:layout_below="@id/progressBar3"/&gt;
  
          &lt;/android.support.v4.widget.SwipeRefreshLayout&gt;
  
      &lt;/LinearLayout&gt;
      &lt;com.google.android.gms.ads.AdView
          android:id="@+id/adView"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_centerHorizontal="true"
          android:layout_alignParentBottom="true"
          ads:adSize="BANNER"
          ads:adUnitId="@string/banner_ad_unit_id"&gt;
      &lt;/com.google.android.gms.ads.AdView&gt;
  &lt;/RelativeLayout&gt;
  </code></pre>