这篇文章主要介绍“怎么使用Android LineChart绘制折线图”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“怎么使用Android LineChart绘制折线图”文章能帮助大家解决问题。
1.首先在 build.gradle 里导入包
implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'
2.新建 启动Activity
LineChartActivity 如下
**
* @Author: Bytezero_zhengLei
* @Time: 2023/3/24 10:12
* @Project_Name: LineChartActivity.java
* @Email: 420498246@qq.com
* @Description:
* @TODO: 折线图
*/
public class LineChartActivity extends AppCompatActivity {
private LineChart lineChart;
List<IncomeBean> list = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_line_chart);
lineChart = (LineChart) findViewById(R.id.linechart);
lineChart = MPAndroidUtil.initChart(this, lineChart);
for (int i =0; i <10; i ++){
IncomeBean incomeBean = new IncomeBean(36.5,"2020-01-01 00:00:00");
list.add(incomeBean);
}
// 开始画折线图
setLineChart(list, "BMI" + "kg/²", getResources().getColor(R.color.bule_title));
}
//设置折线
public void setLineChart(List<IncomeBean> mLineChart, String string, int color) {
lineChart = MPAndroidUtil.initChart(this, lineChart);
lineChart.setData(MPAndroidUtil.showLineChart(mLineChart, string, color));
//设置一页最大显示个数为6，超出部分就滑动
float ratio = (float) mLineChart.size() / (float) 6;
//显示的时候是按照多大的比率缩放显示,1f表示不放大缩小
// lineChart.zoom(ratio, 1f, 0, 0);
// 设置填充图
Drawable drawable = getResources().getDrawable(R.drawable.fade_blue);
MPAndroidUtil.setChartFillDrawable(drawable, lineChart);
// 设置点击的弹窗
MPAndroidUtil.setMarkerView1(lineChart);
/* lineChart.getLineData().addDataSet(MPAndroidUtil.addLine(list1, "地位条", getResources().getColor(R.color.text_orange)));
lineChart.invalidate();*/
}
}3.新建数据 IncomeBean
/**
* @Author: Bytezero_zhengLei
* @Time: 2023/3/24 10:24
* @Project_Name: IncomeBean.java
* @Email: 420498246@qq.com
* @Description:
* @TODO:
*/
public class IncomeBean implements Serializable {
public String tradeDate;// 时间
public double value;// 数值
public IncomeBean(double mValue, String mTradeDate) {
tradeDate = mTradeDate;
value = mValue;
}
@Override
public String toString() {
return "IncomeBean{" +
"tradeDate='" + tradeDate + '\'' +
", value=" + value +
'}';
}
}4.制定折线图的属性 MPAndroidUtil
/**
* @Author: Bytezero_zhengLei
* @Time: 2023/3/24 10:20
* @Project_Name: MPAndroidUtil.java
* @Email: 420498246@qq.com
* @Description:
* @TODO:
*/
public class MPAndroidUtil {
private static final String TAG = "MPAndroidUtil";
private static XAxis xAxis = null; //X轴
private static YAxis leftYAxis; //左侧Y轴
private static YAxis rightYaxis; //右侧Y轴
private static Legend legend; //图例
/**
* 初始化图表 折线图
*/
public static LineChart initChart(Context context, LineChart lineChart) {
/***图表设置***/
//是否展示网格线
lineChart.setDrawGridBackground(false);
//是否显示边界
lineChart.setDrawBorders(false);
//是否可以拖动
lineChart.setDragEnabled(false);
//是否有触摸事件
lineChart.setTouchEnabled(true);
// 关闭双击放大功能
lineChart.setDoubleTapToZoomEnabled(false);
//设置XY轴动画效果
lineChart.animateY(2500);
lineChart.animateX(1500);
lineChart.setBackgroundColor(context.getResources().getColor(R.color.white));
/***XY轴的设置***/
xAxis = null;
xAxis = lineChart.getXAxis();
leftYAxis = lineChart.getAxisLeft();
rightYaxis = lineChart.getAxisRight();
//X轴设置显示位置在底部
xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
xAxis.setAxisMinimum(0f);
xAxis.setGranularity(1f);
//保证Y轴从0开始，不然会上移一点
leftYAxis.setAxisMinimum(0f);
rightYaxis.setAxisMinimum(0f);
// 但还是显示了网格线，而且不是我们想要的 虚线 。其实那是 X Y轴自己的网格线，禁掉即可
xAxis.setDrawGridLines(false);
rightYaxis.setDrawGridLines(false);
leftYAxis.setDrawGridLines(true);
//设置X Y轴网格线为虚线（实体线长度、间隔距离、偏移量：通常使用 0）
leftYAxis.enableGridDashedLine(10f, 10f, 0f);
// 目标效果图没有右侧Y轴，所以去掉右侧Y轴
rightYaxis.setEnabled(false);
/***折线图例 标签 设置***/
legend = lineChart.getLegend();
//legend.setEnabled(false);
//设置显示类型，LINE CIRCLE SQUARE EMPTY 等等 多种方式，查看LegendForm 即可
legend.setForm(Legend.LegendForm.LINE);
legend.setTextSize(12f);
//显示位置 左下方
legend.setVerticalAlignment(Legend.LegendVerticalAlignment.TOP);
legend.setHorizontalAlignment(Legend.LegendHorizontalAlignment.LEFT);
legend.setOrientation(Legend.LegendOrientation.HORIZONTAL);
//是否绘制在图表里面
legend.setDrawInside(false);
// legend.setExtra(mLegendEntries);
// lineChart.setNoDataText(context.getResources().getString(R.string.No_data));
lineChart.setNoDataText(" ");
// 设置右下角的提示
Description description = new Description();
// description.setText("需要展示的内容");
description.setEnabled(false);
lineChart.setDescription(description);
lineChart.setExtraBottomOffset(2 * 8f);
lineChart.setXAxisRenderer(new CustomXAxisRenderer(lineChart.getViewPortHandler(), lineChart.getXAxis(), lineChart.getTransformer(YAxis.AxisDependency.LEFT)));
return lineChart;
}
/**
* 曲线初始化设置 一个LineDataSet 代表一条曲线
*
* @param lineDataSet 线条
* @param color 线条颜色
* @param mode
*/
public static LineDataSet initLineDataSet(LineDataSet lineDataSet, int color, LineDataSet.Mode mode) {
lineDataSet.setColor(color);
lineDataSet.setCircleColor(color);
lineDataSet.setLineWidth(1f);
lineDataSet.setCircleRadius(2f);
//设置曲线值的圆点是实心还是空心
lineDataSet.setDrawCircleHole(true);
lineDataSet.setValueTextSize(10f);
//设置折线图填充
lineDataSet.setDrawFilled(true);
lineDataSet.setFormLineWidth(1f);
lineDataSet.setFormSize(15.f);
if (mode == null) {
//设置曲线展示为圆滑曲线（如果不设置则默认折线）
lineDataSet.setMode(LineDataSet.Mode.CUBIC_BEZIER);
} else {
lineDataSet.setMode(mode);
}
// 不显示值
lineDataSet.setDrawValues(false);
return lineDataSet;
}
public static LineData showLineChart(final List<IncomeBean> dataList, String name, int color) {
List<Entry> entries = new ArrayList<>();
for (int i = 0; i < dataList.size(); i++) {
IncomeBean data = dataList.get(i);
/**
* 在此可查看 Entry构造方法，可发现 可传入数值 Entry(float x, float y)
* 也可传入Drawable， Entry(float x, float y, Drawable icon) 可在XY轴交点 设置Drawable图像展示
*/
Entry entry = new Entry(i, (float) data.value);
entries.add(entry);
}
xAxis.setValueFormatter(new IndexAxisValueFormatter() {
@Override
public String getFormattedValue(float value) {
String tradeDate;
try {
tradeDate = dataList.get((int) value % dataList.size()).tradeDate;
} catch (Exception mE) {
tradeDate = "2020-01-01 00:00:00";
}
return StrToStr("yyyy-MM-dd HH:mm:ss", "MM-dd HH:mm", tradeDate);
}
});
xAxis.setLabelCount(6, false);
leftYAxis.setLabelCount(8);
// 每一个LineDataSet代表一条线
LineDataSet lineDataSet = new LineDataSet(entries, name);
lineDataSet = initLineDataSet(lineDataSet, color, LineDataSet.Mode.CUBIC_BEZIER);
LineData lineData = new LineData(lineDataSet);
return lineData;
}
public static void setMarkerView1(LineChart lineChart) {
// LineChartMarkView1 mv = new LineChartMarkView1(MApplication.getInstance(), xAxis.getValueFormatter());
LineChartMarkView1 mv = new LineChartMarkView1(lineChart.getContext(), xAxis.getValueFormatter());
mv.setChartView(lineChart);
lineChart.setMarker(mv);
lineChart.invalidate();
}
/*
* 设置线条填充背景颜色
*
* @param drawable
*/
public static LineChart setChartFillDrawable(Drawable drawable, LineChart mLineChart) {
if (mLineChart.getData() != null && mLineChart.getData().getDataSetCount() > 0) {
LineDataSet lineDataSet = (LineDataSet) mLineChart.getData().getDataSetByIndex(0);
//避免在 initLineDataSet()方法中 设置了 lineDataSet.setDrawFilled(false); 而无法实现效果
lineDataSet.setDrawFilled(true);
lineDataSet.setFillDrawable(drawable);
mLineChart.invalidate();
}
return mLineChart;
}
// 传入某种格式的时间格式，得到特定的时间格式
public static String StrToStr(String SimpleDateFormat_in, String SimpleDateFormat_out, String str) {
SimpleDateFormat format = new SimpleDateFormat(SimpleDateFormat_in);
SimpleDateFormat format1 = new SimpleDateFormat(SimpleDateFormat_out);
Date date = null;
try {
date = format.parse(str);
} catch (ParseException e) {
e.printStackTrace();
}
return format1.format(date.getTime());
}
}5.LineChartMarkView1
**
* @Author: Bytezero_zhengLei
* @Time: 2023/3/24 10:45
* @Project_Name: LineChartMarkView1.java
* @Email: 420498246@qq.com
* @Description:
* @TODO:
*/
public class LineChartMarkView1 extends MarkerView {
private TextView tvDate;
private TextView tvValue;
private IAxisValueFormatter xAxisValueFormatter;
DecimalFormat df = new DecimalFormat(".00");
public LineChartMarkView1(Context context, IAxisValueFormatter xAxisValueFormatter) {
super(context, R.layout.layout_markview1);
this.xAxisValueFormatter = xAxisValueFormatter;
tvDate = findViewById(R.id.tv_date);
tvValue = findViewById(R.id.tv_value);
}
@SuppressLint("SetTextI18n")
@Override
public void refreshContent(Entry e, Highlight highlight) {
Chart chart = getChartView();
if (chart instanceof LineChart) {
LineData lineData = ((LineChart) chart).getLineData();
//获取到图表中的所有曲线
List<ILineDataSet> dataSetList = lineData.getDataSets();
for (int i = 0; i < dataSetList.size(); i++) {
LineDataSet dataSet = (LineDataSet) dataSetList.get(i);
//获取到曲线的所有在Y轴的数据集合，根据当前X轴的位置 来获取对应的Y轴值
float y = dataSet.getValues().get((int) e.getX()).getY();
if (i == 0) {
tvValue.setText(dataSet.getLabel() + "：" + e.getY());
}
}
tvDate.setText(xAxisValueFormatter.getFormattedValue(e.getX(), null));
}
super.refreshContent(e, highlight);
}
@Override
public MPPointF getOffset() {
return new MPPointF(-(getWidth() / 2), -getHeight());
}
}6.CustomXAxisRenderer
/**
* @Author: Bytezero_zhengLei
* @Time: 2023/3/24 10:23
* @Project_Name: CustomXAxisRenderer.java
* @Email: 420498246@qq.com
* @Description:
* @TODO:
*/
public class CustomXAxisRenderer extends XAxisRenderer {
public CustomXAxisRenderer(ViewPortHandler viewPortHandler, XAxis xAxis, Transformer trans) {
super(viewPortHandler, xAxis, trans);
}
@Override
protected void drawLabel(Canvas c, String formattedLabel, float x, float y, MPPointF anchor, float angleDegrees) {
// super.drawLabel(c, formattedLabel, x, y, anchor, angleDegrees);//注释掉这个，否则坐标标签复写两次
String[] lines = formattedLabel.split(" ");
for (int i = 0; i < lines.length; i++) {
float vOffset = i * mAxisLabelPaint.getTextSize();
Utils.drawXAxisValue(c, lines[i], x, y + vOffset, mAxisLabelPaint, anchor, angleDegrees);
}
}
}7.一些 小的 layout
LineChartMarkView1的layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/shape_square" android:orientation="vertical"> <TextView android:id="@+id/tv_date" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textColor="@android:color/white" /> <TextView android:id="@+id/tv_value" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:textColor="@android:color/white" /> </LinearLayout>
LineChartActivity中的 layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".LineChart.LineChartActivity"> <com.github.mikephil.charting.charts.LineChart android:layout_gravity="center" android:id="@+id/linechart" android:layout_width="match_parent" android:layout_height="300dp" /> </LinearLayout>
这样就ok了
关于“怎么使用Android LineChart绘制折线图”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识，可以关注亿速云行业资讯频道，小编每天都会为大家更新不同的知识点。
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