Android开发之可以动态刷新的显示数据的曲线图

有代码、有图、有真相

显示效果如下图所示：

文件1：主文件 

RtChartsActivity.java

package com.example.mycharttest;//要记得加入库achartengine-1.0.0.jar，否则好多类不能用哦


import java.util.Date;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;

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;
import android.os.Handler;
import android.os.Message;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;

public class RtChartsActivity extends Activity {
	
	int constNum = 100;
	private Timer timer = new Timer();
    private GraphicalView chart;
    private TimerTask task;
    private int addY = -1;
	private long addX;
    private TimeSeries series;
    private XYMultipleSeriesDataset dataset;
    private Handler handler;
    private Random random=new Random();
  
    Date[] xcache = new Date[constNum];
    int[] ycache = new int[constNum];
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.rtchart);
		LinearLayout layout1 = (LinearLayout)findViewById(R.id.linearlayout1);
        //生成图表
		chart = ChartFactory.getTimeChartView(this, getDateDemoDataset(), getDemoRenderer(), "mm:ss");
		layout1.addView(chart, new LayoutParams(LayoutParams.WRAP_CONTENT,380));
		
		
		handler = new Handler() {
        	@Override
        	public void handleMessage(Message msg) {
        		//刷新图表
        		updateChart();
        		super.handleMessage(msg);
        	}
        };
        task = new TimerTask() {
        	@Override
        	public void run() {
        		Message message = new Message();
        	    message.what = 200;
        	    handler.sendMessage(message);
        	}
        };
        timer.schedule(task, 2*1000,1000);
	}
	private void updateChart() {
		    //设定长度为20
		    int length = series.getItemCount();
		    if(length>=constNum) length = constNum;
		    addY=random.nextInt()%5+10;
		    addX=new Date().getTime();
		    
		    //将前面的点放入缓存
			for (int i = 0; i < length; i++) {
				xcache[i] =  new Date((long)series.getX(i));
				ycache[i] = (int) series.getY(i);
			}
		    
			series.clear();
			//将新产生的点首先加入到点集中，然后在循环体中将坐标变换后的一系列点都重新加入到点集中
			series.add(new Date(addX), addY);
			for (int k = 0; k < length; k++) {
	    		series.add(xcache[k], ycache[k]);
	    	}
			//在数据集中添加新的点集
			dataset.removeSeries(series);
			dataset.addSeries(series);
			//曲线更新
			chart.invalidate();
	    }
	private XYMultipleSeriesRenderer getDemoRenderer() {
		    XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();
		    renderer.setChartTitle("网络丢包率图示");//标题
		    renderer.setChartTitleTextSize(20);
		    renderer.setXTitle("时间");    //x轴说明
		    renderer.setYTitle("网络丢包率（‰）");
		    renderer.setAxisTitleTextSize(16);
		    renderer.setAxesColor(Color.BLACK);
		    renderer.setLabelsTextSize(15);    //数轴刻度字体大小
		    renderer.setLabelsColor(Color.BLACK);
		    renderer.setLegendTextSize(15);    //曲线说明
		    renderer.setXLabelsColor(Color.BLACK);
		    renderer.setYLabelsColor(0,Color.BLACK);
		    renderer.setShowLegend(false);
		    renderer.setMargins(new int[] {5, 30, 15, 2});//上左下右{ 20, 30, 100, 0 })
		    XYSeriesRenderer r = new XYSeriesRenderer();
		    r.setColor(Color.RED);
		    r.setChartValuesTextSize(15);
		    r.setChartValuesSpacing(3);
		    r.setPointStyle(PointStyle.POINT);
		    r.setFillBelowLine(true);
		    r.setFillBelowLineColor(Color.WHITE);
		    r.setFillPoints(true);
		    renderer.addSeriesRenderer(r);
		    renderer.setMarginsColor(Color.WHITE);
		    renderer.setPanEnabled(false,false);
		    renderer.setShowGrid(true);
		    renderer.setYAxisMax(50);//纵坐标最大值
		    renderer.setYAxisMin(-30);//纵坐标最小值
		    renderer.setInScroll(true);  
		    return renderer;
		  }
	private XYMultipleSeriesDataset getDateDemoDataset() {//初始化的数据
		    dataset = new XYMultipleSeriesDataset();
		    final int nr = 10;
		    long value = new Date().getTime();
		    Random r = new Random();
		    series = new TimeSeries("Demo series " +  1);
		    for (int k = 0; k < nr; k++) {
		       series.add(new Date(value+k*1000), 20 +r.nextInt() % 10);//初值Y轴以20为中心，X轴初值范围再次定义
		    }
		    dataset.addSeries(series);
		    return dataset;
		  }
	@Override
	public void onDestroy() {
	    	//当结束程序时关掉Timer
	    	timer.cancel();
	    	super.onDestroy();
	    };
}

文件2：布局文件 rtchart.xml

文件3：字符串资源 strings.xml

    移动互联网测量
    Hello world!
    Settings

文件4：配置文件 AndroidManifest.xml