<Android 应用 之路> MPAndroidChart~ScatterChart

简介

MPAndroidChart是PhilJay大神给Android开发者带来的福利。MPAndroidChart是一个功能强大并且使用灵活的图表开源库，支持Android和IOS两种，这里我们暂时只关注Android版本。

Wiki

https://github.com/PhilJay/MPAndroidChart/wiki

Javadoc

https://jitpack.io/com/github/PhilJay/MPAndroidChart/v3.0.0-beta1/javadoc/

今日之图~ScatterChart

布局文件

<?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"
    tools:context="mapdemo.example.com.mpandroidchartdemo.MainActivity">

    <com.github.mikephil.charting.charts.ScatterChart
        android:id="@+id/scatterchart"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="Hello World!" />
</RelativeLayout>

代码

public class MainActivity extends AppCompatActivity {

    @Bind(R.id.scatterchart)
    ScatterChart scatterChart;

    private Random random;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        random = new Random();
        initScatterChart();
    }

    private void initScatterChart() {

        ArrayList<Entry> yVals = new ArrayList<>();
        ArrayList<String> xVals = new ArrayList<>();//初始化横纵坐标内容
        for (int i = 0; i < 5; i++) {
            xVals.add((i + 1) + "月");
            yVals.add(new Entry(random.nextInt(1000), i));//产生数据
        }
        ScatterDataSet scatterDataSet = new ScatterDataSet(yVals, "小明每月支出");
        scatterDataSet.setColors(ColorTemplate.COLORFUL_COLORS);//设置丰富多彩的颜色
        ScatterData scatterData = new ScatterData(xVals, scatterDataSet);//生成Scatterdata对象

        scatterChart.setData(scatterData);//设置对应数据
        scatterChart.getLegend().setPosition(Legend.LegendPosition.ABOVE_CHART_LEFT);
        scatterChart.getLegend().setForm(Legend.LegendForm.CIRCLE);
        scatterChart.setOnChartValueSelectedListener(new OnChartValueSelectedListener() {
            @Override
            public void onValueSelected(Entry entry, int i, Highlight highlight) {
                Toast.makeText(MainActivity.this, "Something selected value = " + entry.getVal(), Toast.LENGTH_SHORT).show();
            }
            @Override
            public void onNothingSelected() {
            }
        });

        scatterChart.getXAxis().setPosition(XAxis.XAxisPosition.BOTTOM);//设置X轴位置
        scatterChart.getAxisRight().setEnabled(false);//右侧Y轴关闭
        scatterChart.getAxisLeft().setAxisMinValue(0.0f);//设置最小Y值
        scatterChart.getXAxis().setGridColor(Color.RED);//设置纵向网格线条颜色
        scatterChart.getAxisLeft().setGridColor(Color.GREEN);//设置横向网格颜色
        scatterChart.setDescription("No Deal");//设置描述内容
        scatterChart.setDescriptionTextSize(20.f);//设置描述文字的字体颜色
        scatterChart.animateXY(1000, 1000);//动画效果
    }
}

备注

ScatterChart和LineChart，BarChart很相似，使用方式也基本相同，基本用法就是这样，后面遇到问题在解决对应的问题，碰到新的需求再解决新的需求。任何问题肯定会有解决办法。