CardView not clickable

Question

In MainActivity, I have a pie chart, where the libary get from GitHub - PhilJay/MPAndroidChart: A powerful Android chart view. I add the pie chart into cardView.When cardView is clicked, toast suppose to be displayed. But the onClickListener not working at all.

MainActivity

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        showChart()

        cardView.setOnClickListener {
            Toast.makeText(application,"clicked",Toast.LENGTH_LONG).show()
        }
    }

    private fun showChart() {

        chart.setUsePercentValues(true)
        chart.description.isEnabled = false
        chart.center
        chart.extraRightOffset = 20f

        chart.isDrawHoleEnabled = true
        chart.setHoleColor(Color.WHITE)

        chart.setTransparentCircleColor(Color.WHITE)
        chart.setTransparentCircleAlpha(10)

        chart.holeRadius = 58f
        chart.transparentCircleRadius = 46f

        chart.setDrawCenterText(true)

        chart.rotationAngle = 0f
        chart.isRotationEnabled = true
        chart.animateY(1400, Easing.EaseInOutQuad)

        val l = chart.legend
        l.verticalAlignment = Legend.LegendVerticalAlignment.CENTER
        l.horizontalAlignment = Legend.LegendHorizontalAlignment.LEFT
        l.orientation = Legend.LegendOrientation.VERTICAL
        l.setDrawInside(false)
        l.xOffset = 50f

        chart.setEntryLabelColor(Color.WHITE)
        chart.setEntryLabelTextSize(12f)
        setData(3,5)
    }

    private fun setData(numOpen: Int, numInProgress: Int) {
        val entries = ArrayList<PieEntry>()
        val colors = ArrayList<Int>()

        if (numOpen > 0) {
            entries.add(PieEntry(numOpen.toFloat(), "Open"))
            colors.add(ColorTemplate.rgb("#F44336"))

        }
        if (numInProgress > 0) {
            entries.add(PieEntry(numInProgress.toFloat(), "Progress"))
            colors.add(ColorTemplate.rgb("#2196F3"))
        }

        val dataSet = PieDataSet(entries, "Status")

        dataSet.sliceSpace = 3f
        dataSet.iconsOffset = MPPointF(0f, 40f)
        dataSet.selectionShift = 5f

        dataSet.colors = colors


        val data = PieData(dataSet)
        data.setValueFormatter(PercentFormatter(chart))
        data.setValueTextSize(11f)
        data.setValueTextColor(Color.WHITE)
        chart.data = data

        // undo all highlights
        chart.highlightValues(null)
        chart.invalidate()
    }
}

main_activity

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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">

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

        <android.support.v7.widget.CardView
                android:id="@+id/cardView"
                android:clickable="true"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="15dp"
                android:layout_marginTop="15dp"
                android:layout_marginRight="15dp">

            <com.github.mikephil.charting.charts.PieChart
                    android:background="@color/colorPrimary"
                    android:id="@+id/chart"
                    android:layout_width="match_parent"
                    android:layout_height="250dp"
                    android:layout_gravity="center_horizontal|center_vertical"/>

        </android.support.v7.widget.CardView>
    </LinearLayout>
</ScrollView>

Image

Answer 1

As the PieChart fully absorbing the click to interact with the chart elements, the click listener defined in the parent will not be called. Even If you set an OnClickListener to PieChart, it won't work. The solution to this problem is to set onChartGestureListener to PieChart and call your method from onChartSingleTapped.

Example

override fun onCreate(savedInstanceState: Bundle?) {
    ...
    cardView.setOnClickListener {
        doThis();
    }

    chart.onChartGestureListener = object : OnChartGestureListener {
        override fun onChartSingleTapped(me: MotionEvent?) {
            doThis()
        }
    }
}

fun doThis(){
    // your code goes here
}