mpandroidchart 对比直方图（柱状图）小例子

ink_s 2016-05-27 12:13:30

最近做了个软件，要画出数据统计图表，网上搜了下，MpAndroidChart很强大，什么曲线的，直方图，饼状图，雷达图都有，但是找了几个例子都是一条曲线的，自己研究了下，做了个可以对比的直方图。

package com.example.textchart;



import android.R.color;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.graphics.Color;



import java.util.ArrayList;



import com.github.mikephil.charting.charts.BarChart;

import com.github.mikephil.charting.components.LimitLine;

import com.github.mikephil.charting.components.XAxis;

import com.github.mikephil.charting.components.YAxis;

import com.github.mikephil.charting.components.XAxis.XAxisPosition;

import com.github.mikephil.charting.data.BarData;

import com.github.mikephil.charting.data.BarDataSet;

import com.github.mikephil.charting.data.BarEntry;

import com.github.mikephil.charting.data.LineDataSet;

import com.github.mikephil.charting.utils.ColorTemplate;



import com.example.textchart.R;

import android.os.Bundle;







public class MainActivity extends Activity {



	public BarChart barChart;  

    public ArrayList<BarEntry> entries = new ArrayList<BarEntry>(); //(x,y1)

    public ArrayList<BarEntry> entries2 = new ArrayList<BarEntry>();//(x,y2)

    public ArrayList<BarEntry> entries3= new ArrayList<BarEntry>();//(x,y3)

    public BarDataSet dataset ,dataset2,dataset3;  

   

    private XAxis xAxis; //X坐标轴

    private YAxis yAxis; //Y

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);



		 barChart = (BarChart) findViewById(R.id.spread_line_chart);  

		 xAxis = barChart.getXAxis();

		 xAxis.setPosition(XAxisPosition.BOTTOM);//X轴在下边

	     yAxis = barChart.getAxisLeft();

	     xAxis.setDrawGridLines(false);//不要竖线网格

	     yAxis.setStartAtZero(false);//不一定从0坐标开始

	     barChart.getAxisRight().setEnabled(false); // 隐藏右边 的坐标轴

	     xAxis.setAvoidFirstLastClipping(false);

	     

	     

	     

/*

 *       barChart.zoom(1.0f,1.0f,0f,0f);  开始时放大倍数（x轴,y轴,起点（x,y））,

        (1.0f,1.0f,0f,0f)(0,0)点开始,放大1倍（原始大小），如果数据太多，不放大会很密集，

        	可以根据数据多少动态计算放大倍数，如下（最多显示5条，可滑动或缩放查看全部）

        int n = (int) Math.ceil(MainActivity.measurements.size()/5.0);

	     if(n==0){

	    	 barChart.zoom(1.0f,1.0f,0f,0f);

	     }else{

	     barChart.zoom((float)n,1.0f,0f,0f); 

	     }



 * 

 */

        barChart.zoom(3.0f,1.0f,0f,0f); 

	     

	        

	        initEntriesData();  //添加Y轴数据

	         

	        show();

	       

	}

	   public void initEntriesData() {  

	        entries.add(new BarEntry(4f, 0));  

	        entries.add(new BarEntry(8f, 1));  

	        entries.add(new BarEntry(6f, 2));  

	        entries.add(new BarEntry(12f, 3));  

	        entries.add(new BarEntry(18f, 4));  

	        entries.add(new BarEntry(9f, 5)); 

	        entries.add(new BarEntry(4f, 6));  

	        entries.add(new BarEntry(8f, 7));  

	        entries.add(new BarEntry(6f, 8));  

	        entries.add(new BarEntry(12f, 9));  

	        entries.add(new BarEntry(18f, 10));  

	        entries.add(new BarEntry(9f, 11)); 

	        

	        entries2.add(new BarEntry(5f, 0));  

	        entries2.add(new BarEntry(6f, 1));  

	        entries2.add(new BarEntry(7f, 2));  

	        entries2.add(new BarEntry(5f, 3));  

	        entries2.add(new BarEntry(13f, 4));  

	        entries2.add(new BarEntry(12f, 5));  

	        entries2.add(new BarEntry(5f, 6));  

	        entries2.add(new BarEntry(6f, 7));  

	        entries2.add(new BarEntry(7f, 8));  

	        entries2.add(new BarEntry(5f, 9));  

	        entries2.add(new BarEntry(13f, 10));  

	        entries2.add(new BarEntry(12f, 11)); 

	        

	        entries3.add(new BarEntry(8f, 0));  

	        entries3.add(new BarEntry(4f, 1));  

	        entries3.add(new BarEntry(15f, 2));  

	        entries3.add(new BarEntry(12f, 3));  

	        entries3.add(new BarEntry(12f, 4));  

	        entries3.add(new BarEntry(1f, 5));  

	        entries3.add(new BarEntry(8f, 6));  

	        entries3.add(new BarEntry(4f, 7));  

	        entries3.add(new BarEntry(15f, 8));  

	        entries3.add(new BarEntry(12f, 9));  

	        entries3.add(new BarEntry(12f, 10));  

	        entries3.add(new BarEntry(1f, 11));

	    }  

   

	 

	public void show() {  

	        dataset = new BarDataSet(entries, "甲"); 

	        dataset.setColor(Color.rgb(255, 48, 48)); 

	        dataset2 = new BarDataSet(entries2, "乙");  

	        dataset2.setColor(Color.rgb(0, 191, 255)); 

	        dataset3 = new BarDataSet(entries3, "丙");  

	        dataset3.setColor(Color.rgb(255, 215, 0)); 

	  

	        ArrayList<BarDataSet> dataSets = new ArrayList<BarDataSet>(); //坐标线的集合。

	        dataSets.add(dataset);

	        dataSets.add(dataset2);

	        dataSets.add(dataset3);

	        

	        ArrayList<String> xVals = new ArrayList<String>(); //x轴坐标

	        for(int i = 1;i<13;i++){

	        	xVals.add("第"+i+"次");

	        }

	        

	        

	        BarData data3 = new BarData(xVals, dataSets);

	        barChart.setData(data3);

	        barChart.animateY(2000);//动画效果 y轴方向，2秒

	        



	       

//	      chart.animateXY(5000,5000);  //动画效果 xy轴方向，5秒

 

	        barChart.setDescription("某某某数据直方图");  

	    }



}