title: WebView to read and zoom image not zoom correclty
body: <p>I'm using a WebView to load a local image, and i need to zoom it, but i have a problem, it has the +/- to zoom but they does not work, and also with 2 finger i can't zoom (the guides that i seen zoom also in that way). Zoom a little bit only with a double click.</p>
  
  <p>My webview (that is in a scroll view):</p>
  
  <pre><code>&lt;ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:fillViewport="true"&gt;
  
  &lt;WebView
              android:layout_width="match_parent"
              android:layout_height="400dp"
              android:layout_marginTop="50dp"
              android:layout_marginRight="15dp"
              android:layout_marginLeft="15dp"
              android:layout_marginBottom="20dp"
              android:id="@+id/webview" /&gt;
  </code></pre>
  
  <p>The Java Class Code:</p>
  
  <pre><code>WebView wv = null;
  wv = (WebView) findViewById(R.id.webview);
          wv.getSettings().setUseWideViewPort(true);
          wv.getSettings().setBuiltInZoomControls(true);
          wv.getSettings().setSupportZoom(true);
          wv.setInitialScale(1);
          wv.loadUrl("file:///android_res/drawable/map.jpg");
  </code></pre>
  
  <p>The image correctly load with the scale 1 entirely (not already zoommed), but i can't zoom it with the 2 finger. Where ar emy errors?
  Thank you so much</p>