我有，我把投入编辑文本，并将其存储在一个列表中的活动。

I have an activity where I take the input from edit text and store it in an list.

我还可以存储在列表中的当前日期。

I also store in list the current date.

然后，我preSS保存按钮，从而节省了上面。

Then , I press the save button which saves the above.

第二天用户输入一些数据更多，保存等。

The next day the user enter some data more and save and so on.

我想要与x轴的日期格式和y轴的用户输入的值的情节。

I want to make a plot with x-axis date format and y axis the values the user entered.

在一个活动，我有：

...
String filename = "data.csv";    
List<Double> mydata=new ArrayList<Double>();
List<Date> mydate=new ArrayList<Date>();

....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<mydate.size();i++){
       bw.write(mydate.get(i)+","+mydata.get(i)+"\n");
   ...

在LineGraph活动：

In the LineGraph Activity:

public class LineGraph extends Activity {


    private static List<Date> date = new ArrayList<Date>();
private static List<Double> data = new ArrayList<Double>();

    public Intent getIntent(Context context){

           readfunc();

      TimeSeries series = new TimeSeries("Showing data");
    for (int i=0;i<date.size();i++){    
        series.add(date.get(i),data.get(i));    

    }

读功能：

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]));

我有这些问题：

I have these problems:

1）我收到的文件是空的（有些问题的日期，因为该方法保存和从文件中读取的作品）。

1) The file I receive is empty (some problem with the Date because the method for saving and reading from a file works).

2）在图形屏幕会出现一个白色背景（当然没有数据，因为该文件是空的），但为什么白色背景？我用的是相同的code用于其他用途，我没有收到whitebackground。

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.

3）我不知道如何使用我使用清单以x axis.Should日期？名单？ 。

3) I am not sure how to use Dates in x axis.Should I use List ? List ? .

------------------------更新---------------------- -----------------------------------

------------------------UPDATE---------------------------------------------------------

好了，终于来了！（用户'丹'的建议后）

Ok ,finally!(After user 'Dan' suggestion)

我用 ChartFactory.getTimeChartView（这一点，数据集，mRenderer，DD / MM / YYYY）;

而不是 ChartFactory.getLineChartIntent（背景下，数据集，mRenderer，DD / MM / YYYY）;

和你不需要使用字符串列表，只是日期列表

and you don't need to use String List , just Date List

推荐答案

在code，它处理你的文件必须是这样的（不编译）：

The code that deal with your file must be something like this (not compiled):

public void savefunc(){
    List<String> myDate = new ArrayList<String>(); //To store the formatted dates
    SimpleDateFormat thedate = new SimpleDateFormat("dd/MM/yyyy"); 
    Date d=new Date(); //the current date
    String sd = thedate.format(d); // sd contains "16/04/2013", the formatted date
    myDate.add(sd);

    double thedata=Double.parseDouble(value.getText().toString().trim());
    mydata.add(thedata);
    ...
    BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));
    for (int i=0;i<mydate.size();i++){
       bw.write(mydate.get(i)+","+mydata.get(i)+"\n");
    }
}


public void readfunc(){

    SimpleDateFormat thedate = new SimpleDateFormat("dd/MM/yyyy"); 
    Date d;
    BufferedReader br = new BufferedReader(new InputStreamReader(fis));

    do {
        s = br.readLine();     
        if (s != null ){
            String[] splitLine = s.split(","); //first substring is the formatted date
            date.add(thedate.parse(splitLine[0])); //do something with exception
            data.add(Double.parseDouble(splitLine[1]));
...

希望它帮助。

Hope it helps.