Hi Android developers, Currently i am working on one Financial based chart application, and i draw the chart with the help of jjoe64 blog. but now i am going to implement real time chart. for example chart is draw automatically in the surface each and every second or a min once made changes in server side. can any one implement these kind of task. please help me regarding this.
A dynamic chart is one that shows change over time like the one we have right in front of us. So, you can see that we've got a progression of change happening throughout this period here.
Ok, I strongly recommend to use AChartEngine. It is free, lightweight and supports many types of charts pie, graph etc. As about to dynamically update the chart i achieved this by adding values in a separate thread.Here is my example,it is nothing fancy:
package my.pack;
import java.util.Date;
import java.util.Random;
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
import org.achartengine.chart.PointStyle;
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;
public class ChartsActivity extends Activity {
private static Random random = new Random();
private static TimeSeries timeSeries;
private static XYMultipleSeriesDataset dataset;
private static XYMultipleSeriesRenderer renderer;
private static XYSeriesRenderer rendererSeries;
private static GraphicalView view;
private static Thread mThread;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dataset = new XYMultipleSeriesDataset();
renderer = new XYMultipleSeriesRenderer();
renderer.setAxesColor(Color.BLUE);
renderer.setAxisTitleTextSize(16);
renderer.setChartTitle("Time");
renderer.setChartTitleTextSize(15);
renderer.setFitLegend(true);
renderer.setGridColor(Color.LTGRAY);
renderer.setPanEnabled(true, true);
renderer.setPointSize(10);
renderer.setXTitle("Time");
renderer.setYTitle("Number");
renderer.setMargins( new int []{20, 30, 15, 0});
renderer.setZoomButtonsVisible(true);
renderer.setBarSpacing(10);
renderer.setShowGrid(true);
rendererSeries = new XYSeriesRenderer();
rendererSeries.setColor(Color.RED);
renderer.addSeriesRenderer(rendererSeries);
rendererSeries.setFillPoints(true);
rendererSeries.setPointStyle(PointStyle.CIRCLE);
timeSeries = new TimeSeries("Random");
mThread = new Thread(){
public void run(){
while(true){
try {
Thread.sleep(2000L);
} catch (InterruptedException e) {
e.printStackTrace();
}
timeSeries.add(new Date(), random.nextInt(10));
view.repaint();
}
}
};
mThread.start();
}
@Override
protected void onStart() {
super.onStart();
dataset.addSeries(timeSeries);
view = ChartFactory.getTimeChartView(this, dataset, renderer, "Test");
view.refreshDrawableState();
view.repaint();
setContentView(view);
}
}
Add your own values to the thread.You may want to take a look on how to use the AChartEngine library. Happy coding!
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With