当我们使用 MPAndroidChart 时提示 java.lang.NegativeArraySizeException
MPFreeChart 继承自 MPAndroidChart,实现此库的目的是解决MPAndroidChart的LineDataChart的X轴无法添加未排序数据(只能添加递增的x轴数据)的问题 当添加未排序数据到MPAndroidChart时,会报如下错误
E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NegativeArraySizeException: -2
at com.github.mikephil.charting.utils.Transformer.generateTransformedValuesLine(Transformer.java:178)
at com.github.mikephil.charting.renderer.LineChartRenderer.drawValues(LineChartRenderer.java:567)
at com.github.mikephil.charting.charts.BarLineChartBase.onDraw(BarLineChartBase.java:297)数据：
entryList.add(new Entry(0f, -1.56f));
entryList.add(new Entry(0.1f, -0.33f));
entryList.add(new Entry(0.2f, 3.68f));
entryList.add(new Entry(0.3f, 13.15f));
entryList.add(new Entry(0.4f, 5.11f));
entryList.add(new Entry(0.5f, 2.98f));
entryList.add(new Entry(0.6f, 1.84f));
entryList.add(new Entry(0.5f, 0.93f));
entryList.add(new Entry(0.4f, -0.43f));
entryList.add(new Entry(0.3f, -9.02f));
entryList.add(new Entry(0.2f, -8.78f));
entryList.add(new Entry(0.1f, -3.63f));
entryList.add(new Entry(0.0f, -2.27f));
Add it in your root build.gradle at the end of the repositories:
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
} dependencies {
implementation 'com.github.hemingzhong:MPFreeChart:v1.0.4'
}MPFreeChart大多数使用方式和MPAndroidChart相同.
不同点如下
- Create the instance object of chart view
<com.hamz.hfreechart.library.XFreeLineChart
android:id="@+id/xf_lineChart"
android:layout_width="match_parent"
android:layout_height="280dp"/>-
创建XFLineChartManager管理类
-
添加点位信息
XFLineChartManager xfLineChartManager = new XFLineChartManager(xFreeLineChart, "电压", Color.CYAN);
xfLineChartManager.setYAxis(15, -15, 6);
xfLineChartManager.setDescription("电位仪采集");
entryList.add(new Entry(0f, -1.56f));
entryList.add(new Entry(0.1f, -0.33f));
entryList.add(new Entry(0.2f, 3.68f));
entryList.add(new Entry(0.3f, 13.15f));
entryList.add(new Entry(0.4f, 5.11f));
entryList.add(new Entry(0.5f, 2.98f));
entryList.add(new Entry(0.6f, 1.84f));
entryList.add(new Entry(0.5f, 0.93f));
entryList.add(new Entry(0.4f, -0.43f));
entryList.add(new Entry(0.3f, -9.02f));
entryList.add(new Entry(0.2f, -8.78f));
entryList.add(new Entry(0.1f, -3.63f));
entryList.add(new Entry(0.0f, -2.27f));
for (int i = 0; i < entryList.size(); i++) {
xfLineChartManager.addEntry(entryList.get(i).getX(), entryList.get(i).getY());
}
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