title: wallpaperManager.getDesiredMinimumWidth() returns -1 in device
body: <p>I am trying to get the default wallpaper resolution of the phone using WallpaperManager.</p>
  
  <pre><code>WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
  Log.v("a",wallpaperManager.getDesiredMinimumWidth());
  Log.v("a",wallpaperManager.getDesiredMinimumHeight());
  </code></pre>
  
  <p>Height returns 800 and Width returns 960 in the emulator but both returns -1 while running in the device.</p>
  
  <p>I have SET_WALLPAPER permission in the manifest.</p>