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How to Add Suffix and Prefix to The Label & Add Legend to Graph in Android?

  • Last Updated : 06 Jun, 2021

When we are looking for a view to represent some statistical data or looking for a UI for displaying a graph in your app so in this article, we will take a look at creating a LineGraphView and adding and prefix to the label of the graph in our Android App. In this article, we will be building a simple Line Graph View in our Android app and we will be displaying some sample data in our application and adding suffix and prefix to the label. 

Add Suffix and Prefix to the Label 

Step by Step Implementation

Step 1: Create a New Project

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.

Step 2: Add this into build.gradle file

implementation ‘com.jjoe64:graphview:4.2.2’



Step 3: Working with the activity_main.xml file

Navigate to the app > res > layout > activity_main.xml and add the below code to that file. Below is the code for the activity_main.xml file. 

XML




<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
  
    <com.jjoe64.graphview.GraphView
        android:id="@+id/graphview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
  
</RelativeLayout>

Step 4: Working with the MainActivity.java file

Go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.

Java




import android.graphics.Color;
import android.os.Bundle;
  
import androidx.appcompat.app.AppCompatActivity;
  
import com.jjoe64.graphview.DefaultLabelFormatter;
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.PointsGraphSeries;
  
public class MainActivity extends AppCompatActivity {
  
    GraphView graphView;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        graphView = findViewById(R.id.graphview);
          
        // For creating Point Graph Series We use PointGraphSeries
        PointsGraphSeries<DataPoint> series = new PointsGraphSeries<>(getDataPoint());
  
        graphView.addSeries(series);
          
        // we use this method to define the 
        // shape that will be used for data points
        series.setShape(PointsGraphSeries.Shape.TRIANGLE);
          
        // we use this method to 
        // define the size of the shape
        series.setSize(50);
          
        // we use this method 
        // to set the color
        series.setColor(Color.RED);
          
        // adding the prefix and suffix here using gridlabelrenderer
        graphView.getGridLabelRenderer().setLabelFormatter(new DefaultLabelFormatter() {
            @Override
            public String formatLabel(double value, boolean isValueX) {
                  
                // if valuex then add the prefix
  
                // return "$"+super.formatLabel(value, isValueX);
                // if valuex then add the suffix
  
                // return super.formatLabel(value, isValueX)+"$";
                if (isValueX) {
                    return "$" + super.formatLabel(value, isValueX);
                }
                return super.formatLabel(value, isValueX);
            }
        });
    }
  
    private DataPoint[] getDataPoint() {
        DataPoint[] dp = new DataPoint[]{
                new DataPoint(0, 1),
                new DataPoint(2, 7),
                new DataPoint(3, 5),
                new DataPoint(5, 2),
                new DataPoint(6, 7),
        };
        return dp;
    }
}

Output:

Add Legend

To add legend go to the MainActivity.java file and refer to the following code. Below is the code for the MainActivity.java file. Comments are added inside the code to understand the code in more detail.

Java




import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
  
import androidx.appcompat.app.AppCompatActivity;
  
import com.jjoe64.graphview.GraphView;
import com.jjoe64.graphview.series.DataPoint;
import com.jjoe64.graphview.series.DataPointInterface;
import com.jjoe64.graphview.series.PointsGraphSeries;
  
public class MainActivity extends AppCompatActivity {
      
    GraphView graphView;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        graphView = findViewById(R.id.graphview);
        PointsGraphSeries<DataPoint> series = new PointsGraphSeries<>(getDataPoint());
  
        graphView.addSeries(series);
        series.setShape(PointsGraphSeries.Shape.TRIANGLE);
        series.setSize(50);
        series.setColor(Color.RED);
          
        // setting custom shape
        series.setCustomShape(new PointsGraphSeries.CustomShape() {
            @Override
            public void draw(Canvas canvas, Paint paint, float x, float y, DataPointInterface dataPoint) {
                paint.setStrokeWidth(5);
                canvas.drawLine(x - 20, y, x, y - 20, paint);
                canvas.drawLine(x, y - 20, x + 20, y, paint);
                canvas.drawLine(x + 20, y, x, y + 20, paint);
                canvas.drawLine(x - 20, y, x, y + 20, paint);
            }
        });
          
        // adding title
        series.setTitle("Title");
  
        // setting visibility to true
        graphView.getLegendRenderer().setVisible(true);
          
        // setting fix position for the title
        graphView.getLegendRenderer().setFixedPosition(4, 5);
          
        // graphView.getLegendRenderer().setAlign(LegendRenderer.LegendAlign.TOP);
        graphView.getLegendRenderer().setTextColor(Color.BLUE);
        graphView.getLegendRenderer().setTextSize(40);
    }
  
    private DataPoint[] getDataPoint() {
        DataPoint[] dp = new DataPoint[]{
                new DataPoint(0, 1),
                new DataPoint(2, 1),
                new DataPoint(3, 5),
                new DataPoint(6, 2),
                new DataPoint(7, 8),
        };
        return dp;
    }
}

Output:

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