CODEWITHSUNDEEP
androidkotlinmpandroidchart
user6657492
user6657492

Reputation:

Displaying a BarChart using mpandroidchart with kotlin

Am trying to use Kotlin to display a simple bar chart using mpandroidchart library. Most of the examples I've been finding online are using java, so copy the code, paste in android studio to convert to Kotlin, then try to fix the errors were necessary. But i just can't seem to fix the one appearing when using the BarEntry as shown in the image. Any help is appreciated. Thanks

enter image description here

Upvotes: 4

Views: 10062

Answers (3)

MaksChojniak
MaksChojniak

Reputation: 11

Unresolved reference: barChart and Variable expected

        private fun setBarChart() {
        val entries = ArrayList<BarEntry>()
        entries.add(BarEntry(8f, 0))
        entries.add(BarEntry(2f, 1))
        entries.add(BarEntry(5f, 2))
        entries.add(BarEntry(20f, 3))
        entries.add(BarEntry(15f, 4))
        entries.add(BarEntry(19f, 5))

        val barDataSet = BarDataSet(entries, "Cells")

        val labels = ArrayList<String>()
        labels.add("18-Jan")
        labels.add("19-Jan")
        labels.add("20-Jan")
        labels.add("21-Jan")
        labels.add("22-Jan")
        labels.add("23-Jan")
        val data = BarData(labels, barDataSet)
        barChart.data = data // set the data and list of lables into chart

        barChart.setDescription("Bar Chart")  // set the description

        //barDataSet.setColors(ColorTemplate.COLORFUL_COLORS)
        barDataSet.color = resources.getColor(R.color.colorAccent)

        barChart.animateY(5000)
    }
}

Upvotes: -1

Raju Tukadiya
Raju Tukadiya

Reputation: 229

enter image description here

step 1:

dependencies {

implementation 'com.github.PhilJay:MPAndroidChart:v2.2.4' 
}

step 2:

repositories {

maven { url "https://jitpack.io" }
}

step 3:

    class MainActivity : AppCompatActivity() {

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

        setBarChart()
    }

    private fun setBarChart() {
        val entries = ArrayList<BarEntry>()
        entries.add(BarEntry(8f, 0))
        entries.add(BarEntry(2f, 1))
        entries.add(BarEntry(5f, 2))
        entries.add(BarEntry(20f, 3))
        entries.add(BarEntry(15f, 4))
        entries.add(BarEntry(19f, 5))

        val barDataSet = BarDataSet(entries, "Cells")

        val labels = ArrayList<String>()
        labels.add("18-Jan")
        labels.add("19-Jan")
        labels.add("20-Jan")
        labels.add("21-Jan")
        labels.add("22-Jan")
        labels.add("23-Jan")
        val data = BarData(labels, barDataSet)
        barChart.data = data // set the data and list of lables into chart

        barChart.setDescription("Set Bar Chart Description")  // set the description

        //barDataSet.setColors(ColorTemplate.COLORFUL_COLORS)
        barDataSet.color = resources.getColor(R.color.colorAccent)

        barChart.animateY(5000)
    }
}

step 4 :

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
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=".MainActivity">

<com.github.mikephil.charting.charts.BarChart
    android:id="@+id/barChart"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>

Upvotes: 6

Md. Asaduzzaman
Md. Asaduzzaman

Reputation: 15423

BarEntry only accept Float and FloatArray. You are passing Int instead of Float. Use f after each value like:

val barEntry = BarEntry(8f, 0f)

Or convert your value to Float using toFloat() provided by Kotlin like:

val barEntry = BarEntry(8f, 0.toFloat())

Upvotes: 3

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