Question

我正在使用MPAndroidChart，想知道如何在以下图表上执行点击事件并获取相关的回调：饼图：点击特定原因打开其详细信息。条形图：点击任意栏打开其详细信息。堆积条形图：点击任意栏打开其详细信息。

我需要在点击图表时收到通知。

Answer 1

使用override func shouldAutorotate() -> Bool { return false } override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask { return UIInterfaceOrientation.Portrait.rawValue }。您可以找到有关如何实施它的文档here。

此侦听器允许您对图表上执行的单击手势做出反应。

Answer 2

for LineChart

   chart.setOnChartValueSelectedListener(new OnChartValueSelectedListener()
    {
        @Override
        public void onValueSelected(Entry e, Highlight h)
        {
            float x=e.getX();
            float y=e.getY();
        }

        @Override
        public void onNothingSelected()
        {

        }
    });

Answer 3

对于LineChart，如果您在Kotlin中使用显示的非浮点值，请使用以下代码

lineChart.setOnChartValueSelectedListener(object : OnChartValueSelectedListener 
       {
        override fun onValueSelected(e: Entry, h: Highlight?) {
            val x = e.x.toString()
            val y = e.y
            val selectedXAxisCount = x.substringBefore(".") //this value is float so use substringbefore method
            // another method shown below
            val nonFloat=lineChart.getXAxis().getValueFormatter().getFormattedValue(e.x)
            //if you are display any string in x axis you will get this
        }

        override fun onNothingSelected() {}
    })

快乐的编码...

Answer 4

For PieChart :- 
mPieChart.setOnChartValueSelectedListener(object : 
OnChartValueSelectedListener {
            override fun onNothingSelected() {
            }

            override fun onValueSelected(e: Entry?, h: Highlight?) {

                val pieEntry = e as PieEntry
                val label: String = pieEntry.label
            }
})

Answer 5

实施[HtmlTargetElement("widget", Attributes = WidgetNameAttributeName)] public class WidgetTagHelper : TagHelper { private readonly IViewComponentHelper _viewComponentHelper; public WidgetTagHelper(IViewComponentHelper viewComponentHelper) { _viewComponentHelper = viewComponentHelper; } ..... public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output) { ((IViewContextAware)_viewComponentHelper).Contextualize(ViewContext); var content = await _viewComponentHelper.InvokeAsync(typeof(FreeTextViewComponent), new { ftxCode = FTXCode, objRef = OBJRef, customPara = CustomPara }); output.Content.SetHtmlContent(content); } }
在活动/片段中注册侦听器
替代方法
这是在科特林
```
OnChartValueSelectedListener
```

Answer 6

实施界面OnChartValueSelectedListener
实施方法

@Override
public void onValueSelected(Entry e, Highlight h) {
   // enter your code here
}

@Override
public void onNothingSelected() {
    // do nothing
}

将此代码添加到图表显示方法

chart.setOnChartValueSelectedListener(this);

MPAndroidChart点击图表上的监听器

6 个答案: