Line Graph View in Android with Example - GeeksforGeeks

31 Jan, 2021
If you are looking for a view to represent some statistical data or looking for a UI for displaying a graph in your app then in this article we will take a look on creating a line graph view in our Android App. 
We will be building a simple Line Graph View in our Android app and we will be displaying some sample data in our application. A sample image is given below to get an idea about what we are going to do in this article. Note that we are going to implement this project using the Java language. 
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 dependency to the build.gradle(Module:app) file
Navigate to the Gradle Scripts > build.gradle(Module:app) and add the below dependency in the dependencies section.   
implementation ‘com.jjoe64:graphview:4.2.2’    
After adding this dependency sync your project and now we will move towards its implementation.  
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: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"    tools:context=".MainActivity">      <!--line graph view where we will         be displaying our data-->    <com.jjoe64.graphview.GraphView        android:id="@+id/idGraphView"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentTop="true" />  </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.os.Bundle;  import androidx.appcompat.app.AppCompatActivity;  import com.jjoe64.graphview.GraphView;import com.jjoe64.graphview.series.DataPoint;import com.jjoe64.graphview.series.LineGraphSeries;  public class MainActivity extends AppCompatActivity {      // creating a variable     // for our graph view.    GraphView graphView;      @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                  // on below line we are initializing our graph view.        graphView = findViewById(R.id.idGraphView);                  // on below line we are adding data to our graph view.        LineGraphSeries<DataPoint> series = new LineGraphSeries<DataPoint>(new DataPoint[]{                // on below line we are adding                 // each point on our x and y axis.                new DataPoint(0, 1),                new DataPoint(1, 3),                new DataPoint(2, 4),                new DataPoint(3, 9),                new DataPoint(4, 6),                new DataPoint(5, 3),                new DataPoint(6, 6),                new DataPoint(7, 1),                new DataPoint(8, 2)        });                  // after adding data to our line graph series.        // on below line we are setting         // title for our graph view.        graphView.setTitle("My Graph View");                  // on below line we are setting         // text color to our graph view.        graphView.setTitleColor(R.color.purple_200);                  // on below line we are setting        // our title text size.        graphView.setTitleTextSize(18);                  // on below line we are adding         // data series to our graph view.        graphView.addSeries(series);    }}
Now run your app and see the output of the app. 
android
Technical Scripter 2020
Android
Java
Technical Scripter
Java
Android
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