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POachartengine - can't figure how to use dates as x axis - the file I save is empty
 

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  1. POachartengine - can't figure how to use dates as x axis - the file I save is empty
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    <p>I have an activity where I take the input from edit text and store it in an list.</p> <p>I also store in list the current date.</p> <p>Then , I press the save button which saves the above.</p> <p>The next day the user enter some data more and save and so on.</p> <p>I want to make a plot with x-axis date format and y axis the values the user entered.</p> <p>In one activity I have:</p> <pre><code>... String filename = "data.csv"; List&lt;Double&gt; mydata=new ArrayList&lt;Double&gt;(); List&lt;Date&gt; mydate=new ArrayList&lt;Date&gt;(); ....value=(EditText) findViewById(R.id.enter_data); ... switch (v.getId()){ case R.id.savebtn: savefunc(); break; case R.id.graphicsbtn: Intent i = new Intent(); i.setClassName(this,LineGraph.class.getName()); this.startActivity(i); break; public void savefunc(){ SimpleDateFormat thedate = new SimpleDateFormat("dd/MM/yyyy"); Date d=new Date(); try{ d=thedate.parse(filename); mydate.add(d); } catch (ParseException e){ // TODO Auto-generated catch block e.printStackTrace(); } double thedata=Double.parseDouble(value.getText().toString().trim()); mydata.add(thedata); .. BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos)); for (int i=0;i&lt;mydate.size();i++){ bw.write(mydate.get(i)+","+mydata.get(i)+"\n"); ... </code></pre> <p>In the LineGraph Activity:</p> <pre><code>public class LineGraph extends Activity { private static List&lt;Date&gt; date = new ArrayList&lt;Date&gt;(); private static List&lt;Double&gt; data = new ArrayList&lt;Double&gt;(); public Intent getIntent(Context context){ readfunc(); TimeSeries series = new TimeSeries("Showing data"); for (int i=0;i&lt;date.size();i++){ series.add(date.get(i),data.get(i)); } </code></pre> <p>The read function:</p> <pre><code>public void readfunc(){ SimpleDateFormat thedate = new SimpleDateFormat("dd/MM/yyyy"); Date d=new Date(); try{ d=thedate.parse(filename); } catch.. BufferedReader br = new BufferedReader(new InputStreamReader(fis)); do { s = br.readLine(); if (s != null ){ String[] splitLine = s.split(","); date.add(d);//Double.parseDouble(splitLine[0])); data.add(Double.parseDouble(splitLine[1])); </code></pre> <p>I have these problems:</p> <p>1) The file I receive is empty (some problem with the Date because the method for saving and reading from a file works).</p> <p>2) At the graph screen appears a white background (of course no data because the file is empty) ,but why white background?I use the same code for other purposes and I don't receive a whitebackground.</p> <p>3) I am not sure how to use Dates in x axis.Should I use List ? List ? . </p> <p>------------------------UPDATE---------------------------------------------------------</p> <p>Ok ,finally!(After user 'Dan' suggestion)</p> <p>I used <code>ChartFactory.getTimeChartView(this, dataset, mRenderer,"dd/MM/yyyy");</code></p> <p>instead of <code>ChartFactory.getLineChartIntent(context, dataset, mRenderer,"dd/MM/yyyy");</code> </p> <p>and you don't need to use String List , just Date List</p>
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