title: ro.sf.lcd_density must be defined as a build property
body: <p>While running the application on the emulator, I have got those errors. How can I solve it so that my program will be more reliable ?</p>
  
  <p>error:</p>
  
  <pre><code> 01-16 11:06:49.211: E/SurfaceFlinger(37): ro.sf.lcd_density must be defined as a build property
  01-16 11:06:49.760: E/Trace(1633): error opening trace file: No such file or directory (2)
  01-16 11:06:51.230: E/SurfaceFlinger(37): ro.sf.lcd_density must be defined as a build property
  </code></pre>