android开发之图表

    在这里使用的插件为Mpchart，只以折线图为例。首先需要导入包。

    在Layout.xml中设置布局，如下：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    >
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="40.0dip"
         >
   <TextView
            android:id="@+id/text4"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            
            android:text="2016年油耗统计"
            
            android:textSize="15dp" />
   </LinearLayout>
   <com.github.mikephil.charting.charts.LineChart
                android:id="@+id/chart1"
                android:layout_width="match_parent"
                android:layout_height="400dp"
                android:layout_marginTop="20dp" />

</RelativeLayout>

  在Activity中设置数据和图表的格式。如下：

package com.example.view;


import java.util.ArrayList;

import android.app.Activity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.WindowManager;

import com.example.iov.R;
import com.github.mikephil.charting.charts.BarLineChartBase.BorderPosition;
import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.LineData;
import com.github.mikephil.charting.data.LineDataSet;
import com.github.mikephil.charting.utils.Legend;
import com.github.mikephil.charting.utils.Legend.LegendForm;
import com.github.mikephil.charting.utils.XLabels;
import com.github.mikephil.charting.utils.XLabels.XLabelPosition;
import com.github.mikephil.charting.utils.YLabels;

public class gaschar extends Activity {
    
    private LineChart mChart;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.gasinfo);

        mChart = (LineChart) findViewById(R.id.chart1);

        // 设置在Y轴上是否是从0开始显示
        mChart.setStartAtZero(true);
        //是否在Y轴显示数据，就是曲线上的数据
        mChart.setDrawYValues(true);
        //设置网格
        mChart.setDrawBorder(true);
        mChart.setBorderPositions(new BorderPosition[] {
            BorderPosition.BOTTOM});
         //在chart上的右下角加描述
        mChart.setDescription("曲线图");
         //设置Y轴上的单位
         mChart.setUnit("￥"); 
        //设置透明度
        mChart.setAlpha(0.8f);
        //设置网格底下的那条线的颜色
        mChart.setBorderColor(Color.rgb(213, 216, 214));
        //设置Y轴前后倒置
        mChart.setInvertYAxisEnabled(false);
        //设置高亮显示
        mChart.setHighlightEnabled(true);
        //设置是否可以触摸，如为false，则不能拖动，缩放等
        mChart.setTouchEnabled(true);
        //设置是否可以拖拽，缩放
        mChart.setDragEnabled(true);
        mChart.setScaleEnabled(true);
        //设置是否能扩大扩小
        mChart.setPinchZoom(true);
        // 设置背景颜色
        // mChart.setBackgroundColor(Color.GRAY);
        //设置点击chart图对应的数据弹出标注
        MyMarkerView mv = new MyMarkerView(this, R.layout.custom_marker_view);
        // define an offset to change the original position of the marker
        // (optional)
        mv.setOffsets(-mv.getMeasuredWidth() / 2, -mv.getMeasuredHeight());
        // set the marker to the chart
        mChart.setMarkerView(mv);
        // enable/disable highlight indicators (the lines that indicate the
        // highlighted Entry)
        mChart.setHighlightIndicatorEnabled(false);
        //设置字体格式，如正楷
        Typeface tf = Typeface.createFromAsset(getAssets(),
                "OpenSans-Regular.ttf");
        mChart.setValueTypeface(tf);

        XLabels xl = mChart.getXLabels();
//        xl.setAvoidFirstLastClipping(true);
//        xl.setAdjustXLabels(true);
        xl.setPosition(XLabelPosition.BOTTOM); // 设置X轴的数据在底部显示
        xl.setTypeface(tf); // 设置字体
        xl.setTextSize(10f); // 设置字体大小
        xl.setSpaceBetweenLabels(3); // 设置数据之间的间距

        YLabels yl = mChart.getYLabels();
        // yl.setPosition(YLabelPosition.LEFT_INSIDE); // set the position
        yl.setTypeface(tf); // 设置字体
        yl.setTextSize(10f); // s设置字体大小
        yl.setLabelCount(5); // 设置Y轴最多显示的数据个数
        // 加载数据
        setData();
        //从X轴进入的动画
        mChart.animateX(4000);
        mChart.animateY(3000);   //从Y轴进入的动画
        mChart.animateXY(3000, 3000);    //从XY轴一起进入的动画
        
        //设置最小的缩放
         mChart.setScaleMinima(0.5f, 1f);
        //设置视口
        // mChart.centerViewPort(10, 50);

        // get the legend (only possible after setting data)
        Legend l = mChart.getLegend();
        l.setForm(LegendForm.LINE);  //设置图最下面显示的类型
        l.setTypeface(tf);  
        l.setTextSize(15);
        l.setTextColor(Color.rgb(104, 241, 175));
        l.setFormSize(30f); // set the size of the legend forms/shapes

        // 刷新图表
        mChart.invalidate();
    }

    private void setData() {
        String[] aa = {"1","2","3","4","5","6","7","8","9","10","11","12","月"};
        String[] bb = {"122.00","234.34","85.67","117.90","332.33","113.33"};

        ArrayList<String> xVals = new ArrayList<String>();
        for (int i = 0; i < aa.length; i++) {
            xVals.add(aa[i]);
        }

        ArrayList<Entry> yVals = new ArrayList<Entry>();

        for (int i = 0; i < bb.length; i++) {
            yVals.add(new Entry(Float.parseFloat(bb[i]), i));
        }

        // create a dataset and give it a type
        LineDataSet set1 = new LineDataSet(yVals, "DataSet Line");

        set1.setDrawCubic(true);  //设置曲线为圆滑的线
        set1.setCubicIntensity(0.2f);
        set1.setDrawFilled(false);  //设置包括的范围区域填充颜色
        set1.setDrawCircles(true);  //设置有圆点
        set1.setLineWidth(2f);    //设置线的宽度
        set1.setCircleSize(5f);   //设置小圆的大小
        set1.setHighLightColor(Color.rgb(244, 117, 117));
        set1.setColor(Color.rgb(104, 241, 175));    //设置曲线的颜色

        // create a data object with the datasets
        LineData data = new LineData(xVals, set1);

        // set data
        mChart.setData(data);
    }
}

其中MyMarkerView（点击节点类）代码：

package com.example.view;

import android.content.Context;
import android.widget.TextView;

import com.example.iov.R;
import com.github.mikephil.charting.data.CandleEntry;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.utils.MarkerView;
import com.github.mikephil.charting.utils.Utils;

public class MyMarkerView extends MarkerView {

    private TextView tvContent;

    public MyMarkerView(Context context, int layoutResource) {
        super(context, layoutResource);

        tvContent = (TextView) findViewById(R.id.tvContent);
    }

    // callbacks everytime the MarkerView is redrawn, can be used to update the
    // content
    @Override
    public void refreshContent(Entry e, int dataSetIndex) {

        if (e instanceof CandleEntry) {

            CandleEntry ce = (CandleEntry) e;

            tvContent.setText("" + Utils.formatNumber(ce.getHigh(), 0, true));
        } else {

//            tvContent.setText("" + Utils.formatNumber(e.getVal(), 0, true));
            tvContent.setText("" +e.getVal());
        }
    }
}

效果如下：