title: Android background appears banded
body: <p>I'm trying to set a background using a GradientDrawable. Everything works fine except that the background appears with significant banding. I've tried to enable dithering, but it's not getting any better. Here is a screen shot:</p>
  
  <p><img src="https://i.stack.imgur.com/yccyn.png" alt="enter image description here"></p>
  
  <p>From a coding standpoint, I've done this:</p>
  
  <pre><code>public class MainActivity extends Activity {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          /* Deal with gradient banding */
          getWindow().setFormat(PixelFormat.RGBA_8888);
  
          setContentView(R.layout.activity_main);      
      }
  
      /* Another attempt to deal with the banding */
      @Override
      public void onAttachedToWindow() {
          super.onAttachedToWindow();
          Window window = getWindow();
          window.setFormat(PixelFormat.RGBA_8888);
      }
  
      @Override
      public boolean onCreateOptionsMenu(Menu menu) {
          // Inflate the menu; this adds items to the action bar if it is present.
          getMenuInflater().inflate(R.menu.main, menu);
          return true;
      }
  
  }
  </code></pre>
  
  <p>And finally, the XML files:</p>
  
  <p>activity_main.xml</p>
  
  <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:paddingBottom="@dimen/activity_vertical_margin"
      android:paddingLeft="@dimen/activity_horizontal_margin"
      android:paddingRight="@dimen/activity_horizontal_margin"
      android:paddingTop="@dimen/activity_vertical_margin"
      android:background="@drawable/background"
      tools:context=".MainActivity" &gt;
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>drawable/background.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;shape xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;gradient
          android:angle="90"
          android:startColor="#999"
          android:endColor="#fff"
          android:type="linear"
              android:dither="true"
      /&gt;
  &lt;/shape&gt;
  </code></pre>
  
  <p>Is there any way to make this look any better? Thank you!</p>