title: Background image size for all screens
body: <p>I want to use background image in my app.But i am so confused about different screen sizes.I found this question:</p>
  
  <p><a href="https://stackoverflow.com/questions/13024272/android-background-image-size-in-pixel-which-support-all-devices">Android: Background Image Size (in Pixel) which Support All Devices</a></p>
  
  <p>But in answer he said <code>xxxhdpi: 1280x1920 px</code> but Lg G3 is <code>xxxHdpi</code> and screen resolution: <code>1440 x 2560</code> </p>
  
  <p>I need a roadmap.How should be my image sizes for all screens ? (mdpi,hdpi,xhdpi etc.)</p>