android下使用RChart画曲线图动态刷新

 

画曲线图的activity：

复制到剪贴板  Java代码

import java.io.IOException;
import java.io.InputStream;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

import com.java4less.rchart.Chart;
import com.java4less.rchart.ChartAdapter;
import com.java4less.rchart.ChartListener;
import com.java4less.rchart.ChartLoader;
import com.java4less.rchart.android.ChartPanel;
import com.java4less.rchart.gc.android.ChartAndroidImage;

public class ShowChart extends Activity {

 private String data = "";
 private int cishu=0;
 private static final int xnum=9;
 ChartLoader cha=new ChartLoader();
 ChartPanel chartPanel;

    public void onCreate(Bundle icicle) {
      cha=new ChartLoader();
      // this is to be able to load the images
         ChartAndroidImage.assets=getAssets();
         String chartfile=this.getIntent().getStringExtra("com.java4less.rchart.samples.file");
         super.onCreate(icicle);
         chartPanel = new ChartPanel(this);
         try {
    chartPanel.setChart(loadFromAsset(chartfile));
   } catch (Exception e) {
    Log.e(ChartPanel.TAG,"Could not lod chart from file.",e);
   }
         setContentView(chartPanel);
     }

    protected void onDestroy() {

      if (chartPanel!=null)
        if (chartPanel.getChart()!=null) chartPanel.getChart().stopUpdater();

      super.onDestroy();
     }

 // create chart listener for the drill down chart曲线图的刷新方法
 ChartAdapter chartAdapterRealtime=new ChartAdapter() {
  public void chartEvent(Chart c,int type) {
   // load subchart
   if (type==ChartListener.EVENT_BEFORE_UPDATE) createRealtimedata(cha);
   //设置刷新时间！！
   c.msecs=1000;
  }
 };
               public Chart loadFromAsset(String name) throws IOException {

            InputStream is = getAssets().open(name);
            cha.loadFromFile(is, true);
             Log.i(ChartPanel.TAG,"Building chart ...");
            Chart c=cha.build(false,false);
             //c.msecs=5000;在此处尝试设置刷新时间，失败！
            c.addChartListener(chartAdapterRealtime);
            c.startUpdater();
            Log.i(ChartPanel.TAG,"Build ok");
            return c;

        }

     //刷新时调用该方法
     private void createRealtimedata(ChartLoader loader) {
   // create chart

   // set initial value of the X Axis based on the time
   java.util.Date now=java.util.Calendar.getInstance().getTime();
   java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("dd/MM/yy hh:mm:ss");

   loader.setParameter("XAXIS_INITIAL_DATE",formatter.format(now));

   //右边为最新数据
   java.util.Random r=new java.util.Random();
   if(cishu
   {
    if (data.length()>0) data=data+ "|" ;
    data=data+r.nextInt(50);
    cishu++;
   }
   else
   {
    data=data.substring(data.indexOf("|")+1)+"|"+r.nextInt(50);
   }
   loader.setParameter("SERIE_DATA_1",data);

    }

}

调用上面activity的类：

复制到剪贴板  Java代码

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import com.util.ShowChart;

public class sensor extends ListActivity {
//private static final String TAG = "J4LChartDemos";

 String[] examples={"combined2Positions.txt","patternFilling.txt","linechart.txt","barChart3D.txt","targetZones.txt","MultiCharts.txt","radarChart.txt","scatterChart.txt","areaChart.txt","areaCurves.txt","axisOnTop.txt","barChart.txt","barImages.txt","bubbleChart.txt","candleStick.txt",
   "combinedChart.txt","event.txt","gauge.txt","linechart3D.txt","linechartClipping.txt","linechartNULLS.txt",
   "pieChart2D.txt","piechart3D.txt","realtime.txt","stackedBar.txt",
   "StackedMultiAxis.txt","MultiAxis.txt"};

 String[] labels={"Combined","Curves and notes","Linechart","Barchart 3D (update)","Target zones","Multicharts","Radarchart","Scatterchart","Areachart","Curves","Axis on Top","Barchart","Bars and Images","BubbleChart","Candlestick",
   "Combined 2","Events","Gauge","Linechart 3D","Linechart & Clipping","Linechart and nulls",
   "Piechart 2D","Piechart 3D","Realtime","Stacked bars",
   "Stacked Multiaxis","MultiAxis"};


    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {

        super.onCreate(icicle);
        List> list = new ArrayList>();
        for (int i=0; i
            addItem(list, labels[i], activityIntent(examples[i]));
        setListAdapter(new SimpleAdapter(this,list,android.R.layout.simple_list_item_1,new String[] { "title" },new int[] { android.R.id.text1 }));
       }

    protected Intent activityIntent(String fileName) {
        Intent result = new Intent();
        result.setClass(this.getApplication(),ShowChart.class);
        result.putExtra("com.java4less.rchart.samples.file", fileName);
        return result;
    }

    protected void addItem(List> data, String name, Intent intent) {
        Map temp = new HashMap();
        temp.put("title", name);
        temp.put("intent", intent);
        data.add(temp);
    }
    protected void onListItemClick(ListView l, View v, int position, long id) {
        Map map = (Map) l.getItemAtPosition(position);

        Intent intent = (Intent) map.get("intent");
        startActivity(intent);
    }

}