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    <p>The code that saves data only stores a text line containing both number separates by a tab. When your code reads the file, you read the entire line, trying to parse the text, that obviously is unparseable (has a tab).</p> <p>You should iterate your arrays writing each line. Then, the read method should split the readed string and parse each substring separately.</p> <p>Regards.</p> <p>Lets try to explain what I would do [not compiled]:</p> <pre><code>File sdCard = Environment.getExternalStorageDirectory(); File directory = new File (sdCard, "MyFiles"); directory.mkdirs(); File file = new File(directory, filename); FileOutputStream fos; try { fos = new FileOutputStream(file); BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos)); //I assume mydata and myweight are both List&lt;Double&gt;... with same size for(int i = 0; i &lt; mydata.size(); i++){ bw.write(mydata.get(i)+"\t"+myweight.get(i)+"\n"); } bw.flush(); bw.close(); } catch (IOException e2) { e2.printStackTrace(); }//catch </code></pre> <p>...</p> <pre><code>File sdCard = Environment.getExternalStorageDirectory(); File directory = new File (sdCard, "MyFiles"); File file = new File(directory, filename); String s; FileInputStream fis; try { fis = new FileInputStream(file); BufferedReader br = new BufferedReader(new InputStreamReader(fis)); do { s = br.readLine(); if (s != null) { String[] splitLine = s.split("\\t"); data.add(Double.parseDouble(splitLine[0])); weight.add(Double.parseDouble(splitLine[1])); } } while (s != null); } catch (IOException e) { e.printStackTrace(); } </code></pre>
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    1. COYou mean that? bw.write(mydata+"\n"); bw.write(myweight+"\n"); .Because it still has the same results.It seems that it can't save the "weight" field.
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      1. USGeorge
    2. CO:Thanks!It worked great!I used ArrayList but now I use List.Now in the excel file it is in one cell for example "1 10" in the below cell "2 20".I want to have the data in 2 columns."data" in the 1st and weight in the 2nd.I can't figure how to do it.
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    3. COWell, actually you're using a simple plain text not a xls file. It isn't trivial dealing with excel file in Java (see Apache POI), but you can save your data as CSV, by using comma as separator. Excel knows how to dealing with and show each data in different column
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