Help: achartengine draw a line diagram, how the value of fixed-y coordinates

Prawn, brother just learning android, recently encountered a question to ask you for pointing it.
I achartengine draw a line chart, you need to customize the x, y-axis value

 
XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer (); 
renderer.setXLabels (0); 
for (int i = 0; i <10; i + +) {
renderer.addXTextLabel (i, "test" + i); 
} 

X-axis shows the settings I mentioned above, can be normal, but when I set the y-axis, but not normal, what the y-axis does not

 
XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer (); 
renderer.setYLabels (0); 
for (int i = 0; i <10; i + +) {
renderer.addYTextLabel (i, "test" + i); 
} 

I somehow did not make things right for a long time, do not know how to get, ah, ah prawn help

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XYSeriesRenderer r = new XYSeriesRenderer ();
r.setDisplayChartValues ​​(true) ;/ / point values ​​displayed
Distance
r.setChartValuesSpacing (15) ;/ / display the value of the point of FIG.r.setChartValuesTextSize value (50) ;/ / point size of the text
renderer.addSeriesRenderer (r);