Hi, In this post we are going to learn, How we can create a pie chart in android studio. The pie chart is very important for data analysis because it is easy to understand.
We can create a pie chart by using MP Android chart dependency. MP Android chart is an easy and powerful way to design many types of charts.
Without wasting your time, we are going to explain to you how to make charts.
Create Pie Chart In Android Studio
Step 1: Adding Dependency
The first things you need to do is to add the dependency.
Dependencies allow us to include an external library or local jar files or other library modules in Android project
Go to Android then build.gradle(Module: app) and add this inside dependency
dependencies {
implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'
}
Now add following line of code in your repository in build.gradle(Project: App Name)
allprojects {
repositories {
google()
jcenter()
maven { url 'https://jitpack.io' }
}
}
Now sync your project.
Step 2: Adding Pie Chart in .xml
After we add dependency, our second step is to add the pie chart in .xml
<com.github.mikephil.charting.charts.PieChart
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/pieChart"/>
Step 3: Adding values in Pie Chart
After adding pie chart in xml we need to pass data in Pie chart, we do this in java file by using following code
public class MainActivity extends AppCompatActivity {
PieChart pieChart;
PieData pieData;
List<PieEntry> pieEntryList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pieChart = findViewById(R.id.pieChart);
pieChart.setUsePercentValues(true);
pieEntryList.add(new PieEntry(10,"India"));
pieEntryList.add(new PieEntry(5,"US"));
pieEntryList.add(new PieEntry(7,"UK"));
pieEntryList.add(new PieEntry(3,"NZ"));
PieDataSet pieDataSet = new PieDataSet(pieEntryList,"country");
pieData = new PieData(pieDataSet);
pieChart.setData(pieData);
pieChart.invalidate();
}
}
Now, I am going to explain each line of code. First, we create a reference variable of the pie chart, pie data. We also create a list of pie Entry by following line of code
PieChart pieChart;
PieData pieData;
List<PieEntry> pieEntryList = new ArrayList<>();
Pie chart uses pie data to represent values, and Pie Data uses a list of pie entries to represent values.
After this inside onCreate() we connect Pie chart to its xml view. We set Pie chart to use percent values to represent data by these line of code
pieChart = findViewById(R.id.pieChart);
pieChart.setUsePercentValues(true);
Now, we add pieEntry objects in pieEntry List and then add it in the Pie Data set and then we add pie data set to pie data by given code.
Pie entry takes two arguments in the constructor, first represents the value, and the second represents the name.
pieEntryList.add(new PieEntry(10,"India"));
pieEntryList.add(new PieEntry(5,"US"));
pieEntryList.add(new PieEntry(7,"UK"));
pieEntryList.add(new PieEntry(3,"NZ"));
PieDataSet pieDataSet = new PieDataSet(pieEntryList,"country");
pieData = new PieData(pieDataSet);
After this, we only need to connect it to the pie chart and we do this easily by given code.
setData() sets the data and invalidate() is used if we update our values then it automatically changes the values in the pie chart
pieChart.setData(pieData);
pieChart.invalidate();
If you run your code you see something like this, yes! I know what are you thinking.

We can change the color and UI in the next heading
Step 4: Customizing Pie chart
Changing Colours
We are going to change colour of pie chart, to do so we just add the setColor() method in pie data set like this
pieDataSet.setColors(ColorTemplate.JOYFUL_COLORS);

Complete code
public class MainActivity extends AppCompatActivity {
PieChart pieChart;
PieData pieData;
List<PieEntry> pieEntryList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pieChart = findViewById(R.id.pieChart);
pieChart.setUsePercentValues(true);
pieEntryList.add(new PieEntry(10,"India"));
pieEntryList.add(new PieEntry(5,"US"));
pieEntryList.add(new PieEntry(7,"UK"));
pieEntryList.add(new PieEntry(3,"NZ"));
PieDataSet pieDataSet = new PieDataSet(pieEntryList,"country");
pieDataSet.setColors(ColorTemplate.JOYFUL_COLORS);
pieData = new PieData(pieDataSet);
pieChart.setData(pieData);
pieChart.invalidate();
}
}
Removing hole in Pie chart
If you want to remove the hole in pie chart, you need to use this method
pieChart.setDrawHoleEnabled(false);

What it does it, It removes your hole radius, also If you want to change your hole radius you can do this by the following code
pieChart.setHoleRadius(3);
Change Description Of Pie Chart
To change the description of pie chart, you need to add simply this line of code
pieChart.getDescription().setText("Country");

Conclusion:
I Hope, you learn something new in this post. You can refer docs if you want some other feature in the pie chart or simply comment on your doubts.
Read about toast, the back button in the android studio here. com github mikephil charting charts piechart
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