AChartEngine实现Android实时曲线绘制

前两天由于项目需要做了一个基于Android的实时采集系统，需要对参数以实时曲线的形式显示，在网上找了找基于Android的图表工具以及源码，最终还是选取了AChartEngine来绘制，这个图表库用起来很是方便。下面将自己写的一个随机数的实时曲线和大家分享一下~~

本程序是基于Android2.2的

思路比较简单，即在一个MainActivity中点击按钮跳入另一个RtChartsActivity并显示实时曲线。

MainActivity中

public class MainActivity extends Activity {private Button button; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);button=(Button)this.findViewById(R.id.button);button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Intent intent = new Intent();intent.setClass(MainActivity.this, RtChartsActivity.class);startActivity(intent);}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.activity_main, menu);return true;}}

在RtChartsActivity中，首先初始化曲线，然后在Timer中定时updateChart()曲线

public class RtChartsActivity extends Activity {    private Timer timer = new Timer();    private GraphicalView chart;    private TextView textview;    private TimerTask task;    private int addY = -1;    private long addX;    /**曲线数量*/    private static final int SERIES_NR=1;    private static final String TAG = "message";    private TimeSeries series1;    private XYMultipleSeriesDataset dataset1;    private Handler handler;    private Random random=new Random();    /**时间数据*/    Date[] xcache = new Date[20];/**数据*/    int[] ycache = new int[20];@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.rtchart);LinearLayout layout = (LinearLayout)findViewById(R.id.linearlayout);        //生成图表chart = ChartFactory.getTimeChartView(this, getDateDemoDataset(), getDemoRenderer(), "hh:mm:ss");layout.addView(chart, new LayoutParams(LayoutParams.WRAP_CONTENT,380));//为TextView添加事件textview = (TextView)findViewById(R.id.myview);textview.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(RtChartsActivity.this, "ceshiview", 1).show();Intent intent = new Intent();intent.setClass(RtChartsActivity.this, MainActivity.class);startActivity(intent);}});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 = series1.getItemCount();    if(length>=20) length = 20;    addY=random.nextInt()%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)series1.getX(i));ycache[i] = (int) series1.getY(i);}series1.clear();series1.add(new Date(addX), addY);for (int k = 0; k < length; k++) {    series1.add(xcache[k], ycache[k]);    }//在数据集中添加新的点集dataset1.removeSeries(series1);dataset1.addSeries(series1);//曲线更新chart.invalidate();    }/** * 设定如表样式 * @return */   private XYMultipleSeriesRenderer getDemoRenderer() {    XYMultipleSeriesRenderer renderer = new XYMultipleSeriesRenderer();    renderer.setChartTitle("实时曲线");//标题    renderer.setChartTitleTextSize(20);    renderer.setXTitle("时间");    //x轴说明    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[] {20, 30, 100, 0});    XYSeriesRenderer r = new XYSeriesRenderer();    r.setColor(Color.BLUE);    r.setChartValuesTextSize(15);    r.setChartValuesSpacing(3);    r.setPointStyle(PointStyle.CIRCLE);    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);    renderer.setYAxisMin(-30);    renderer.setInScroll(true);  //调整大小    return renderer;  }   /**    * 数据对象    * @return    */   private XYMultipleSeriesDataset getDateDemoDataset() {    dataset1 = new XYMultipleSeriesDataset();    final int nr = 10;    long value = new Date().getTime();    Random r = new Random();    for (int i = 0; i < SERIES_NR; i++) {      series1 = new TimeSeries("Demo series " + (i + 1));      for (int k = 0; k < nr; k++) {        series1.add(new Date(value+k*1000), 20 +r.nextInt() % 10);      }      dataset1.addSeries(series1);    }    Log.i(TAG, dataset1.toString());    return dataset1;  }    @Override    public void onDestroy() {    //当结束程序时关掉Timer    timer.cancel();    super.onDestroy();    };}

效果是这样的~~

源程序可以在这里下载http://download.csdn.net/detail/best198706/5408151