最近在开发一款天气app，有一个功能是显示当天24小时每三个小时的气温状况，这个功能无疑要用图表来实现最好了。所以在github上找到一个国人开发的图表库，XCL-Charts。
先上效果图：
首先创建一个SplineChartView继承自GraphicalView，再主要实现三个方法
第一个是关于图表的渲染
private void chartRender()
{
try {
//设置绘图区默认缩进px值,留置空间显示Axis,Axistitle....
int [] ltrb = getBarLnDefaultSpadding();
chart.setPadding(ltrb[0] + DensityUtil.dip2px(this.getContext(), 20), ltrb[1],
ltrb[2]+DensityUtil.dip2px(this.getContext(), 30), ltrb[3]);
//显示边框
chart.showRoundBorder();
//数据源
chart.setCategories(labels);
chart.setDataSource(chartData);
// chart.setCustomLines(mCustomLineDataset);
//坐标系
//数据轴最大值
chart.getDataAxis().setAxisMax(40);
chart.getDataAxis().setAxisMin(-40);
//数据轴刻度间隔
chart.getDataAxis().setAxisSteps(2);
//标签轴最大值
chart.setCategoryAxisMax(5);
//标签轴最小值
chart.setCategoryAxisMin(0);
//背景网格
PlotGrid plot = chart.getPlotGrid();
plot.hideHorizontalLines();
plot.hideVerticalLines();
chart.getPlotArea().setBackgroundColor(true, Color.GRAY);
chart.getCategoryAxis().getAxisPaint().setColor(Color.WHITE);
chart.getCategoryAxis().getAxisPaint().setTextSize(6);
chart.getCategoryAxis().hideTickMarks();
chart.getCategoryAxis().getTickLabelPaint().setColor(Color.WHITE);
chart.getCategoryAxis().getTickLabelPaint().setFakeBoldText(true);
chart.getCategoryAxis().setTickLabelMargin(25);
chart.getCategoryAxis().getTickLabelPaint().setTextSize(25);
//不使用精确计算，忽略Java计算误差,提高性能
chart.disableHighPrecision();
chart.disablePanMode();
chart.hideBorder();
chart.getPlotLegend().hide();
chart.getDataAxis().hide();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("tag", e.toString());
}
}其中chart.getPlotArea().setBackgroundColor(true, Color.GRAY);是设置图表绘制区的颜色，chart.getDataAxis().setAxisMax(40);在我的app中表示能显示的最高温度是40摄氏度，chart.getDataAxis().setAxisMin(-40);表示能显示的最低温度是-40摄氏度。
第二个和第三个都是绑定数据的。public void setChartDataSet(List temps)
{
//线1的数据集
List linePoint1 = new ArrayList();
linePoint1.add(new PointD(0d, Double.parseDouble(temps.get(0))));
linePoint1.add(new PointD(1d, Double.parseDouble(temps.get(1))));
linePoint1.add(new PointD(2d, Double.parseDouble(temps.get(2))));
linePoint1.add(new PointD(3d, Double.parseDouble(temps.get(3))));
linePoint1.add(new PointD(4d, Double.parseDouble(temps.get(4))));
linePoint1.add(new PointD(5d, Double.parseDouble(temps.get(5))));SplineData dataSeries1 = new SplineData("Go",linePoint1,
Color.WHITE );
//把线弄细点
dataSeries1.getLinePaint().setStrokeWidth(3);
dataSeries1.setLineStyle(XEnum.LineStyle.DASH);
dataSeries1.setLabelVisible(false);
dataSeries1.setDotStyle(XEnum.DotStyle.RING);
dataSeries1.getDotPaint().setColor(getResources().getColor(R.color.white));
dataSeries1.getPlotLine().getPlotDot().setRingInnerColor(getResources().getColor(R.color.grey));
chartData.add(dataSeries1);
this.invalidate();
}
public void setChartLabels(List<String> weather){
String[] times={"20:00\n","23:00\n","2:00\n","5:00\n","8:00\n","11:00\n"};
for(int i=0;i<weather.size();i++){
labels.add(times[i]+weather.get(i));
}
this.invalidate();
}
由于需要动态添加数据，也就是温度，这里我设置了6个时段的温度，每个时段三个小时。在setChartDataSet方法中添加了参数，dataSeries1.getLinePaint().setStrokeWidth(3);设置了绘制曲线的线宽度，dataSeries1.setLineStyle(XEnum.LineStyle.DASH)设置了曲线的类型。setChartLabels(List<String> weather)设置了横轴坐标表示什么意思，在这里表示时段和天气状态。第四个是图批注
public void setChartAnchor(List<String> temps){
//激活点击监听
chart.ActiveListenItemClick();
//为了让触发更灵敏，可以扩大5px的点击监听范围
chart.extPointClickRange(5);
chart.showClikedFocus();
//批注
List<AnchorDataPoint> mAnchorSet = new ArrayList<AnchorDataPoint>();
AnchorDataPoint an2 = new AnchorDataPoint(0,0,XEnum.AnchorStyle.TOBOTTOM);
an2.setBgColor(Color.WHITE);
an2.setLineWidth(15);
an2.setLineStyle(XEnum.LineStyle.DASH);
an2.setTextColor(Color.WHITE);
an2.setTextSize(55);
an2.setAnchor(temps.get(0));
AnchorDataPoint an3 = new AnchorDataPoint(0,1,XEnum.AnchorStyle.TOBOTTOM);
an3.setBgColor(Color.WHITE);
an3.setLineStyle(XEnum.LineStyle.DASH);
an3.setTextColor(Color.WHITE);
an3.setTextSize(55);
an3.setAnchor(temps.get(1));
//从点到底的标识线
//从点到底的标识线
AnchorDataPoint an4 = new AnchorDataPoint(0,2,XEnum.AnchorStyle.TOBOTTOM);
an4.setBgColor(Color.WHITE);
an4.setLineWidth(15);
an4.setLineStyle(XEnum.LineStyle.DASH);
an4.setTextColor(Color.WHITE);
an4.setTextSize(55);
an4.setAnchor(temps.get(2));
AnchorDataPoint an5 = new AnchorDataPoint(0,3,XEnum.AnchorStyle.TOBOTTOM);
an5.setBgColor(Color.WHITE);
an5.setLineWidth(15);
an5.setLineStyle(XEnum.LineStyle.DASH);
an5.setTextColor(Color.WHITE);
an5.setTextSize(55);
an5.setAnchor(temps.get(3));
AnchorDataPoint an6 = new AnchorDataPoint(0,4,XEnum.AnchorStyle.TOBOTTOM);
an6.setBgColor(Color.WHITE);
an6.setLineWidth(15);
an6.setLineStyle(XEnum.LineStyle.DASH);
an6.setTextColor(Color.WHITE);
an6.setTextSize(55);
an6.setAnchor(temps.get(4));
AnchorDataPoint an7 = new AnchorDataPoint(0,5,XEnum.AnchorStyle.TOBOTTOM);
an7.setBgColor(Color.WHITE);
an7.setLineWidth(15);
an7.setLineStyle(XEnum.LineStyle.DASH);
an7.setTextColor(Color.WHITE);
an7.setTextSize(55);
an7.setAnchor(temps.get(5));
mAnchorSet.add(an2);
mAnchorSet.add(an3);
mAnchorSet.add(an4);
mAnchorSet.add(an5);
mAnchorSet.add(an6);
mAnchorSet.add(an7);
chart.setAnchorDataPoint(mAnchorSet);
this.invalidate();
}an2.setBgColor(Color.WHITE);
an2.setLineWidth(15);
an2.setLineStyle(XEnum.LineStyle.DASH);
an2.setTextColor(Color.WHITE);
an2.setTextSize(55);
an2.setAnchor(temps.get(0));
上面第一行依然是设置背景色为白色，第二行是批注线的宽度，第三行是设置批注线为虚线，第四、五行设置了批注文字的颜色和大小，第六行则是将批注文字绑定到an2上。
附上完整代码
package com.example.springweather.customview;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import org.xclcharts.chart.PointD;
import org.xclcharts.chart.SplineChart;
import org.xclcharts.chart.SplineData;
import org.xclcharts.common.DensityUtil;
import org.xclcharts.renderer.XEnum;
import org.xclcharts.renderer.info.AnchorDataPoint;
import org.xclcharts.renderer.plot.PlotGrid;
import org.xclcharts.view.ChartView;
import org.xclcharts.view.GraphicalView;
import com.example.springweather.R;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
public class SplineChartView extends GraphicalView {
private SplineChart chart = new SplineChart();
//分类轴标签集合
private LinkedList labels = new LinkedList();
private LinkedList chartData = new LinkedList();
Paint pToolTip = new Paint(Paint.ANTI_ALIAS_FLAG);public SplineChartView(Context context) {
super(context);
// TODO Auto-generated constructor stub
initView();
}
public SplineChartView(Context context, AttributeSet attrs){
super(context, attrs);
initView();
}
public SplineChartView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
initView();
}
@Override
public void refreshChart() {
super.refreshChart();
labels.clear();
chartData.clear();
}
private void initView()
{
List<String> weather=new ArrayList<String>();
for(int i=0;i<6;i++){
weather.add("晴");
}
List<String> temps=new ArrayList<String>();
for(int i=0;i<6;i++){
temps.add("1");
}
setChartLabels(weather);
setChartDataSet(temps);
setChartAnchor(temps);
chartRender();
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
//图所占范围大小
chart.setChartRange(w,h);
}
protected int[] getBarLnDefaultSpadding()
{
int [] ltrb = new int[4];
ltrb[0] = DensityUtil.dip2px(getContext(), 0); //left
ltrb[1] = DensityUtil.dip2px(getContext(), 0); //top
ltrb[2] = DensityUtil.dip2px(getContext(), 0); //right
ltrb[3] = DensityUtil.dip2px(getContext(), 30); //bottom
return ltrb;
}
private void chartRender()
{
try {
//设置绘图区默认缩进px值,留置空间显示Axis,Axistitle....
int [] ltrb = getBarLnDefaultSpadding();
chart.setPadding(ltrb[0] + DensityUtil.dip2px(this.getContext(), 20), ltrb[1],
ltrb[2]+DensityUtil.dip2px(this.getContext(), 30), ltrb[3]);
//显示边框
chart.showRoundBorder();
//数据源
chart.setCategories(labels);
chart.setDataSource(chartData);
// chart.setCustomLines(mCustomLineDataset);
//坐标系
//数据轴最大值
chart.getDataAxis().setAxisMax(40);
chart.getDataAxis().setAxisMin(-40);
//数据轴刻度间隔
chart.getDataAxis().setAxisSteps(2);
//标签轴最大值
chart.setCategoryAxisMax(5);
//标签轴最小值
chart.setCategoryAxisMin(0);
//背景网格
PlotGrid plot = chart.getPlotGrid();
plot.hideHorizontalLines();
plot.hideVerticalLines();
chart.getPlotArea().setBackgroundColor(true, Color.GRAY);
chart.getCategoryAxis().getAxisPaint().setColor(Color.WHITE);
chart.getCategoryAxis().getAxisPaint().setTextSize(6);
chart.getCategoryAxis().hideTickMarks();
chart.getCategoryAxis().getTickLabelPaint().setColor(Color.WHITE);
chart.getCategoryAxis().getTickLabelPaint().setFakeBoldText(true);
chart.getCategoryAxis().setTickLabelMargin(25);
chart.getCategoryAxis().getTickLabelPaint().setTextSize(25);
//不使用精确计算，忽略Java计算误差,提高性能
chart.disableHighPrecision();
chart.disablePanMode();
chart.hideBorder();
chart.getPlotLegend().hide();
chart.getDataAxis().hide();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("tag", e.toString());
}
}
public void setChartDataSet(List<String> temps)
{
//线1的数据集
List<PointD> linePoint1 = new ArrayList<PointD>();
linePoint1.add(new PointD(0d, Double.parseDouble(temps.get(0))));
linePoint1.add(new PointD(1d, Double.parseDouble(temps.get(1))));
linePoint1.add(new PointD(2d, Double.parseDouble(temps.get(2))));
linePoint1.add(new PointD(3d, Double.parseDouble(temps.get(3))));
linePoint1.add(new PointD(4d, Double.parseDouble(temps.get(4))));
linePoint1.add(new PointD(5d, Double.parseDouble(temps.get(5))));
SplineData dataSeries1 = new SplineData("Go",linePoint1,
Color.WHITE );
//把线弄细点
dataSeries1.getLinePaint().setStrokeWidth(3);
dataSeries1.setLineStyle(XEnum.LineStyle.DASH);
dataSeries1.setLabelVisible(false);
dataSeries1.setDotStyle(XEnum.DotStyle.RING);
dataSeries1.getDotPaint().setColor(getResources().getColor(R.color.white));
dataSeries1.getPlotLine().getPlotDot().setRingInnerColor(getResources().getColor(R.color.grey));
chartData.add(dataSeries1);
this.invalidate();
}
public void setChartLabels(List<String> weather){
String[] times={"20:00\n","23:00\n","2:00\n","5:00\n","8:00\n","11:00\n"};
for(int i=0;i<weather.size();i++){
labels.add(times[i]+weather.get(i));
}
this.invalidate();
}
public void setChartAnchor(List<String> temps){
//激活点击监听
chart.ActiveListenItemClick();
//为了让触发更灵敏，可以扩大5px的点击监听范围
chart.extPointClickRange(5);
chart.showClikedFocus();
//批注
List<AnchorDataPoint> mAnchorSet = new ArrayList<AnchorDataPoint>();
AnchorDataPoint an2 = new AnchorDataPoint(0,0,XEnum.AnchorStyle.TOBOTTOM);
an2.setBgColor(Color.WHITE);
an2.setLineWidth(15);
an2.setLineStyle(XEnum.LineStyle.DASH);
an2.setTextColor(Color.WHITE);
an2.setTextSize(55);
an2.setAnchor(temps.get(0));
AnchorDataPoint an3 = new AnchorDataPoint(0,1,XEnum.AnchorStyle.TOBOTTOM);
an3.setBgColor(Color.WHITE);
an3.setLineStyle(XEnum.LineStyle.DASH);
an3.setTextColor(Color.WHITE);
an3.setTextSize(55);
an3.setAnchor(temps.get(1));
//从点到底的标识线
//从点到底的标识线
AnchorDataPoint an4 = new AnchorDataPoint(0,2,XEnum.AnchorStyle.TOBOTTOM);
an4.setBgColor(Color.WHITE);
an4.setLineWidth(15);
an4.setLineStyle(XEnum.LineStyle.DASH);
an4.setTextColor(Color.WHITE);
an4.setTextSize(55);
an4.setAnchor(temps.get(2));
AnchorDataPoint an5 = new AnchorDataPoint(0,3,XEnum.AnchorStyle.TOBOTTOM);
an5.setBgColor(Color.WHITE);
an5.setLineWidth(15);
an5.setLineStyle(XEnum.LineStyle.DASH);
an5.setTextColor(Color.WHITE);
an5.setTextSize(55);
an5.setAnchor(temps.get(3));
AnchorDataPoint an6 = new AnchorDataPoint(0,4,XEnum.AnchorStyle.TOBOTTOM);
an6.setBgColor(Color.WHITE);
an6.setLineWidth(15);
an6.setLineStyle(XEnum.LineStyle.DASH);
an6.setTextColor(Color.WHITE);
an6.setTextSize(55);
an6.setAnchor(temps.get(4));
AnchorDataPoint an7 = new AnchorDataPoint(0,5,XEnum.AnchorStyle.TOBOTTOM);
an7.setBgColor(Color.WHITE);
an7.setLineWidth(15);
an7.setLineStyle(XEnum.LineStyle.DASH);
an7.setTextColor(Color.WHITE);
an7.setTextSize(55);
an7.setAnchor(temps.get(5));
mAnchorSet.add(an2);
mAnchorSet.add(an3);
mAnchorSet.add(an4);
mAnchorSet.add(an5);
mAnchorSet.add(an6);
mAnchorSet.add(an7);
chart.setAnchorDataPoint(mAnchorSet);
this.invalidate();
}
@Override
public void render(Canvas canvas) {
try{
canvas.drawColor(Color.GRAY);
chart.render(canvas);
} catch (Exception e){
Log.e("tag", e.toString());
}
}}
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