Achartengine - Can't Figure How to Use Dates as X Axis - the File I Save Is Empty

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

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]));
...

Hope it helps.

How to set date on x axis in Line Chart using AchartEngine?

These are basic changes i made in my code and it worked for me..

TimeSeries series2 = new TimeSeries("Protein");

            for (int i = 0; i < x_axis.size(); i++) {

                int y = Integer.parseInt(y1_axis.get(i));

                // Adding y as protein value
                series2.add(i + 1, y);

            }

    for (int i = 0; i < x_axis.size(); i++) {
        renderer.addXTextLabel(i + 1, x_axis.get(i));
    }

    renderer.setXLabels(0);

TimeSeries vs XYSeries AchartEngine

The X axis have to share the same values if you really want the line charts be displayed together.

So you will either have to have all the charts X axis be date values or all of them be double values.

scatter plot with dates at x axis -- add custom labels on X axis

As told by Dan in his answer you can use renderer.addXTextLabel(x, "text"); to set x-axis labels.

In your case:: u made mistake at commented line ,
You where trying to add x-axis labels twice..

change it as shown below

  TimeSeries series = new TimeSeries("Showing data");
    for (int i=0;i<date_asDates.size();i++){    

        series.add(i,data.get(i));    // only this change ll work as u needed
    }

UPDATE: Change Your code to following it wont crash on adding new data's

and if u want only points to be visible not linealong with point then change this ChartFactory.getLineChartIntent(getBaseContext(), dataset, mRenderer,"dd/MM/yyyy"); to ChartFactory.getScatterChartIntent(getBaseContext(), dataset, mRenderer,"dd/MM/yyyy");

MainActivity.java

package com.example.trying;
import java.io.BufferedWriter;
import java.io.File; // imports add all as before too

public class MainActivity extends Activity implements OnClickListener{

View savebtn;
View graphicsbtn;
EditText value,weight;
String filename = "mydata.csv";    
public static List<String> dates_Strings = new ArrayList<String>();
public static List<Double> data = new ArrayList<Double>();
public static List<Date> date = new ArrayList<Date>();

List<Double> mydata=new ArrayList<Double>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

     date.clear();
     data.clear();
     dates_Strings.clear();
     //Set up click listeners
    savebtn=(View) findViewById(R.id.savebtn);
    savebtn.setOnClickListener(this);
    graphicsbtn=(View) findViewById(R.id.graphicsbtn);
    graphicsbtn.setOnClickListener(this);

    value=(EditText) findViewById(R.id.enter_data);

}

//called when a button is clicked
public void onClick(View v) {
    switch (v.getId()){
    case R.id.savebtn:
        savefunc();      
        break;
    case R.id.graphicsbtn:        
        Intent i = new Intent(this,LineGraph.class);        
        startActivity(i);
        break;

}
}

public void savefunc(){

    SimpleDateFormat thedate = new SimpleDateFormat("dd/MM/yyyy"); 
    Date d=new Date();

    String formattedDate=thedate.format(d);
    Log.d("tag","format"+formattedDate);
    dates_Strings.add(formattedDate);

    try{
        double thedata=Double.parseDouble(value.getText().toString().trim());
        mydata.add(thedata);
        Log.d("tag","thedata :"+thedata);
    } catch (NumberFormatException e){
        String message="Sorry you did't type anything";

         Toast toast = Toast.makeText(getBaseContext(), message,Toast.LENGTH_SHORT);  
         toast.setGravity(Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM, 0, 100);
         toast.show();
  // Toast.makeText(getBaseContext(), "Sorry you did't type anything",    Toast.LENGTH_SHORT).show();

    }

    File sdCard = Environment.getExternalStorageDirectory();
    File directory = new File (sdCard, "MyFiles");
    directory.mkdirs();            
    File file = new File(directory, filename);

    FileOutputStream fos;

    //saving them
    try {
       fos = new FileOutputStream(file);

          BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(fos));
          for (int i=0;i<mydata.size();i++){
                bw.write(mydata.get(i)+","+dates_Strings.get(i)+"\n");
          }
          value.setText("");
          bw.flush();
          bw.close();

        } catch (IOException e2) {
           e2.printStackTrace();
            }//catch
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

LineGraph.java

package com.example.trying;

import java.io.BufferedReader;
import java.io.File; // add all other imports

public class LineGraph extends MainActivity {

String filename = "mydata.csv";    

private LinearLayout layout;
private GraphicalView mChartView;

protected void onCreate(Bundle savedInstanceState){

     super.onCreate(savedInstanceState);
     setContentView(R.layout.graph);
     layout = (LinearLayout) findViewById(R.id.chart);

    readfunc();       

    //trying to copy the dates_asString to date (Dates) in order to use them in TimeSeries
    SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
    Date convertedDate;//=new Date();
    try{
   for (int k=0;k<dates_Strings.size();k++){
    convertedDate = formatter.parse(dates_Strings.get(k));
    date.add(convertedDate);
    Log.d("line","convertedDate :"+convertedDate);
   }
    }catch (ParseException e){

        // TODO Auto-generated catch block
        e.printStackTrace();
    }

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

    XYMultipleSeriesDataset dataset=new XYMultipleSeriesDataset();
    dataset.addSeries(series);

    //renderer for decay
    XYSeriesRenderer renderer =new XYSeriesRenderer();
    renderer.setColor(Color.YELLOW);
    renderer.setLineWidth(3);
    renderer.setPointStyle(PointStyle.SQUARE);

    XYMultipleSeriesRenderer mRenderer =new XYMultipleSeriesRenderer();
    mRenderer.addSeriesRenderer(renderer);
    mRenderer.setXTitle("Date");
    mRenderer.setYTitle("Data");
    mRenderer.setApplyBackgroundColor(true);
    mRenderer.setBackgroundColor(Color.BLACK);
    mRenderer.setMarginsColor(Color.BLACK);
    mRenderer.setXRoundedLabels(false);
    mRenderer.setShowCustomTextGrid(true);
    mRenderer.setXLabels(0);

    for (int i=0;i<date.size();i++){
        mRenderer.addXTextLabel(i,dates_Strings.get(i));

    }

     //mChartView = ChartFactory.getTimeChartView(this, dataset, mRenderer,"dd/MM/yyyy");

    //mChartView = ChartFactory.getScatterChartView(this, dataset, mRenderer);
    //layout.addView(mChartView);
    Intent intent= ChartFactory.getLineChartIntent(getBaseContext(), dataset, mRenderer,"dd/MM/yyyy");  
    startActivity(intent);

 }

public void readfunc(){

SimpleDateFormat thedate = new SimpleDateFormat("dd/MM/yyyy"); 
Date d=new Date();
String formattedDate=thedate.format(d);

    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(",");
                 data.add(Double.parseDouble(splitLine[0]));
                 //dates_Strings.add(thedate.parse(splitLine[1]));
                 dates_Strings.add(formattedDate);
       }                        
             } while (s != null );
          br.close();                      
       } catch (IOException e) {
          e.printStackTrace();
           }
}

}

how to implement TimeChart in achartengine with android

So you need a layout (main.xml):

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:id="@+id/chart"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" />

    <LinearLayout
        android:id="@+id/layXzoom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:orientation="horizontal"
        android:padding="5dp" >
    </LinearLayout>

</RelativeLayout>

and activity (TestgrafActivity.java):

    package si.pd.testgraf;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Random;

import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.PointStyle;
import org.achartengine.chart.TimeChart;
import org.achartengine.model.TimeSeries;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.LinearLayout;

public class TestgrafActivity extends Activity {
    /** Called when the activity is first created. */
    private XYMultipleSeriesDataset mDataset;
    private XYMultipleSeriesRenderer mRenderer;
    List<double[]> values = new ArrayList<double[]>();
    private GraphicalView mChartView;
    private TimeSeries time_series;

    // chart container
    private LinearLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        layout = (LinearLayout) findViewById(R.id.chart);

        // create dataset and renderer
        mDataset = new XYMultipleSeriesDataset();
        mRenderer = new XYMultipleSeriesRenderer();
        mRenderer.setAxisTitleTextSize(16);
        mRenderer.setChartTitleTextSize(20);
        mRenderer.setLabelsTextSize(15);
        mRenderer.setLegendTextSize(15);
        mRenderer.setPointSize(3f);

        XYSeriesRenderer r = new XYSeriesRenderer();
        r.setColor(Color.GREEN);
        r.setPointStyle(PointStyle.CIRCLE);
        r.setFillPoints(true);
        mRenderer.addSeriesRenderer(r);
        mRenderer.setClickEnabled(true);
        mRenderer.setSelectableBuffer(20);
        mRenderer.setPanEnabled(true);

        time_series = new TimeSeries("test");

        mDataset.addSeries(time_series);

        fillData();

        mChartView = ChartFactory.getTimeChartView(this, mDataset, mRenderer,
                "H:mm:ss");

        layout.addView(mChartView);
    }

    private void fillData() {
        long value = new Date().getTime() - 3 * TimeChart.DAY;
        for (int i = 0; i < 100; i++) {
            time_series.add(new Date(value + i * TimeChart.DAY / 4), i);
        }
    }
}

I didn't tested the code so maybe there are some errors. Just wanted that you get the picture.

I did test at home. If you give me an email, I can send you eclipse project.

Horizontal bar chart plotting issues using achartengine

The horizontal bar chart was developed more like an experiment. This is why there are some issues with it as described here.

It also seems like you are developing against version 1.0.0. I suggest you upgraded to the latest 1.1.0 version available here.

save user data during a day (the same day - many user data)

This is an AChartEngine issue indeed. The internal model used to be kept in ArrayLists and these issues didn't exist. At some point there was a community effort to make AChartEngine faster with a lot of data points. At that point, the model started to use a Map instead of an ArrayList. This implementation prevented having the same X value added several times. However, in order to fix this, I add a very small value to X, if it already exists. In your example, the first value is 20/04/2013 00:00:00.0, the second one is at 20/04/2013 00:00:00.001 and the third is 20/04/2013 00:00:00.002.

Now, the solution to your problem is to have a wider range on the X axis.

renderer.setXAxisMax(someDate.getTime());

where someDate can be something like 21/04/2013.

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