title: Related to: MPAndroidChart BarChart xValues Issue
body: <p>English isn't my first language. So, Please excuse me if I'm not so clear, feel free to ask details.</p>
  
  <p>I'm having the same problem as in this post: <a href="https://stackoverflow.com/questions/28645883/mpandroidchart-barchart-xvalues-issue">MPAndroidChart BarChart xValues Issue</a></p>
  
  <p>In a barchart with 2 series xVals labels aren't displayed correctly, here are some test cases:</p>
  
  <p><strong>case 1</strong></p>
  
  <pre><code>xVals = from 1 (index 0) to 30 (index 29) (days in a month, say april)
  set1 = 3 values for 3 days (10,17,22): a.e. barentry(100,10), barentry(200,17), barentry(300,22)  
  set2 = 3 values for 3 days (4,11,18): a.e. barentry(100,4), barentry(200,11), barentry(300,18)  
  </code></pre>
  
  <p>in this case the <code>barchart</code> displays bars and xvals labels as independent, any bar is below his xvals label</p>
  
  <p><strong>case 2</strong></p>
  
  <pre><code>xVals = from 1 (index 0) to 30 (index 29) (days in april)  
  set1 = as previous but added 0 values with set2 index : a.e. barentry(0,4), barentry(100,10), barentry(0,11),barentry(200,17), barentry(0,18), barentry(300,22)  
  set2 = as previous but added 0 values with set1 index : a.e. barentry(100,4), barentry(0,10), barentry(200,11),barentry(0,17), barentry(300,18), barentry(0,22) 
  </code></pre>
  
  <p>in this case the <code>barchart</code> displays bars and xvals labels as independent, any bar is below his xvals label</p>
  
  <p><strong>case 3</strong></p>
  
  <pre><code>xVals = from 1 (index 0) to 30 (index 29) (days in april)  
  set1 filled with 0 for everyday barentry(0,[0 to 29]), then added values for 3 days (10,17,22): barentry(0,10)....  
  set2 filled with 0 for everyday barentry(0,[0 to 29]), then added values for 3 days (4,11,18): barentry(0,4)....  
  </code></pre>
  
  <p>in this case I can see every bar in the right place with relative xvals label but it's horrible to see all these 0s!</p>
  
  <p>Please take note that if in case 1 I don't add set2 (so a simple barchart with 1 series) everything it's ok without the need 0 values.</p>
  
  <p>The question is: How can I get rid of the 0 values where not needed (as in example in days 1 to 3 and so on)?</p>
  
  <p>Thanks in advance</p>
  
  <p>Edit:<br>
  PFA screenshots, both are the same graph the only difference are sets with/without all days value.<br>
  The code is same from multidataset example and it works fine for every graph.</p>
  
  <p>Only days with data: <a href="http://mysite.altervista.org/temp/some.png" rel="nofollow noreferrer">http://mysite.altervista.org/temp/some.png</a></p>
  
  <p>All days: <a href="http://mysite.altervista.org/temp/all.png" rel="nofollow noreferrer">http://mysite.altervista.org/temp/all.png</a></p>