Engineering Format of y-axis values in AChartEngine for Android -

i working on project need plotting data. use android studio 5.2.0 , achartengine 1.2.0 on windows 7 64 bits pc. interested in engineering formatting of y-labels, e.g. 2.3e6.. have studied without success. wish 1, 3, 0, 1 , 1 min no. of integer digits, max no. of integer digits, min no. of fraction digits, max no. of fraction digits , no. of digits in exponent part, respectively. in addition exponent must muliple of 3.

here linegraph class:

public class linegraph {     public intent getintent(context context)     {         int size = ( int ) math.pow(2, 10);         double start = 0;         double end = 2 * math.pi;         double inc = (end - start) / (size - 1);         double[] x = new double[size];         double[] y = new double[size];          xymultipleseriesdataset dataset = new xymultipleseriesdataset();         timeseries series = new timeseries("sin * cos");         ( int = 0; < size; i++ )         {             x[i] = start + * inc;             y[i] = 10000 * math.sin(x[i]) * math.cos(x[i]);             series.add(x[i], y[i]);         }          dataset.addseries(series);         xyseriesrenderer ren = new xyseriesrenderer();          // xyseriesrenderer properties         ren.setcolor(color.red);         ren.setfillpoints(true);         ren.setdisplayboundingpoints(false);         ren.setfillpoints(true);         ren.setlinewidth(2f);          // xymultipleseriesrenderer properties         xymultipleseriesrenderer mren = new xymultipleseriesrenderer();         mren.setantialiasing(true);         mren.setmargins(new int[] { 10, 80, 10, 10 });         mren.setshowgrid(true);         mren.setapplybackgroundcolor(true);         mren.setbackgroundcolor(color.ltgray);         mren.setgridcolor(color.white);         mren.setlabelstextsize(20f);         mren.setylabelsverticalpadding(-5f);         mren.setylabelspadding(40);         mren.setshowlegend(false);         mren.setxlabels(5);         mren.setylabels(10);          // number format         decimalformat noformat = new decimalformat("##0.##e0");         noformat.setminimumintegerdigits(1);         noformat.setmaximumintegerdigits(3);         noformat.setminimumfractiondigits(0);         noformat.setmaximumfractiondigits(2);         mren.setylabelformat(noformat, 0);         mren.addseriesrenderer(renderer);          // construct , return intent.         intent intent = chartfactory.getlinechartintent(context, dataset, mren, "line graph");         return intent;     } } 

and mainactivity:

public class mainactivity extends actionbaractivity {     @override     protected void oncreate(bundle savedinstancestate)     {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);     }      @override     public boolean oncreateoptionsmenu(menu menu)     {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.main, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item)     {         int id = item.getitemid();         if ( id == r.id.action_settings )         { return true; }          return super.onoptionsitemselected(item);     }      public void linegraphhandler(view view)     {         linegraph linegraph = new linegraph();         intent lineintent = linegraph.getintent(this);         startactivity(lineintent);     } } 

here activity_main.xml:

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"         xmlns:tools="http://schemas.android.com/tools"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:paddingbottom="@dimen/activity_vertical_margin"         android:paddingleft="@dimen/activity_horizontal_margin"         android:paddingright="@dimen/activity_horizontal_margin"         android:paddingtop="@dimen/activity_vertical_margin"         tools:context="ramin.graphtutorial.graph.mainactivity">      <button         android:id="@+id/button_linegraph"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:layout_centerhorizontal="true"         android:onclick="linegraphhandler"         android:text="@string/button_line_graph_text"/>  </relativelayout> 

and finally, manifest.xml file:

<?xml version="1.0" encoding="utf-8"?> <manifest     package="ramin.graphtutorial.graph"     xmlns:android="http://schemas.android.com/apk/res/android">      <application         android:allowbackup="true"         android:allowclearuserdata="true"         android:allowtaskreparenting="true"         android:hardwareaccelerated="true"         android:icon="@drawable/ic_launcher"         android:label="@string/app_name"         android:theme="@style/apptheme">         <activity             android:name="ramin.graphtutorial.graph.mainactivity"             android:label="@string/app_name">             <intent-filter>                 <action android:name="android.intent.action.main"/>                 <category android:name="android.intent.category.launcher"/>             </intent-filter>         </activity>          <activity android:name="org.achartengine.graphicalactivity"/>     </application> </manifest> 

it works fine when apply format method of noformat single double value, not fomatting y-labels. latter following;

xymultipleseriesrenderer mren = new xymultipleseriesrenderer(); xyseriesrenderer ren = new xyseriesrenderer (); mren.addseriesrenderer(ren); int noofylabels = 5; mren.setylabels( noofylabels ); mren.setylabelformat( noformat, 0 ); 

but 3 zeros, i.e., 000 values along y-axis larger 1000. have tried manually setting y-value text labels, following code snippet:

double[] ylabels = mren.getytextlabellocations(0); mren.setylabels( 0 ); ( int = 0; < noofylabels; i++ ) { mren.addytextlabel( ylabels[ ], noformat.format( ylabels[ ] ) ); } 

but index out of bound in array ylabels. please me on issue? ps: asked question previously, didn't answers. maybe question not clear enough. thank in advance. ramin.

try this

    private linearlayout chartlayout;     private graphicalview mchart;      @override     protected void oncreate(bundle savedinstancestate)     {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);         showlinegraph( );     }      public void showlinegraph()     {         chartlayout=    (linearlayout) findviewbyid(r.id.graphholder); //      linegraph linegraph = new linegraph();          int size = (int) math.pow(2, 10);         double start = 0;         double end = 2 * math.pi;         double inc = (end - start) / (size - 1);         double[] x = new double[size];         double[] y = new double[size];          xymultipleseriesdataset dataset = new xymultipleseriesdataset();         timeseries series = new timeseries("sin * cos");         for(int = 0; < size; i++)         {             x[i] = start + * inc;             y[i] = 1000 * math.sin(x[i]) * math.cos(x[i]);             series.add(x[i], y[i]);         }          dataset.addseries(series);         xyseriesrenderer ren = new xyseriesrenderer();          // xyseriesrenderer properties         ren.setcolor(color.red);         ren.setfillpoints(true);         ren.setdisplayboundingpoints(false);         ren.setfillpoints(true);         ren.setlinewidth(2f);          // xymultipleseriesrenderer properties         xymultipleseriesrenderer mren = new xymultipleseriesrenderer();         mren.setantialiasing(true);         mren.setmargins(new int[] { 10, 80, 10, 10 });         mren.setshowgrid(true);         mren.setapplybackgroundcolor(true);         mren.setbackgroundcolor(color.ltgray);         mren.setgridcolor(color.white);         mren.setlabelstextsize(20f);         mren.setylabelsverticalpadding(-5f);         mren.setylabelspadding(40);         mren.setshowlegend(false);         mren.setxlabels(5);         mren.setylabels(10);          // number format         decimalformat noformat = new decimalformat("##0.##e0");         noformat.setminimumintegerdigits(1);         noformat.setmaximumintegerdigits(3);         noformat.setminimumfractiondigits(0);         noformat.setmaximumfractiondigits(2);         mren.setylabelformat(noformat, 0);         mren.addseriesrenderer(ren);          // construct , return intent.         view = chartfactory.getlinechartview(this, dataset, mren);         chartlayout.addview(view);     }