Complete guide on How to build a Video Player in Android

How to create a COVID-19 Tracker Android App

Last Updated : 27 Mar, 2025

The world is facing one of the worst epidemics, the outbreak of COVID-19, you all are aware of that. So during this lockdown time let's create a COVID-19 Tracker Android App using REST API which will track the Global Stats only.

covid-19

Step by Step Implementation to Create Covid-19 Tracker Android Application

Step1: Opening a New Project

Open a new project just click of File option at topmost corner in left.
Then click on new and open a new project with whatever name you want.
Now we gonna work on Empty Activity with language as Java. Leave all other options as untouched.
You can change the name of project as per your choice.

By default, there will be two files activity_main.xml and MainActivity.java.

Step 2: Adding Dependency in Application

- Before going to the coding section first you have to do some pre-task. Go to Gradle Scripts->build.gradle (Module: app) section and import following dependencies and click the "sync Now" on the above pop up. We are adding Volley Library in Android.

build.gradle (:app)

 dependencies {
    // Other dependencies...
    implementation 'com.android.volley:volley:1.2.1'
}

- Go to app->manifests->AndroidManifests.xml section and allow "Internet Permission".

AndroidManifests.xml

 <uses-permission android:name="android.permission.INTERNET" />

Step 3: Designing the UI

Below is the code for the xml file.

activity_main.xml

<?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"
    android:padding="16dp"
    android:background="@color/white"
    tools:context=".MainActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="15dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent">

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

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Global Stats"
                android:layout_marginBottom="20dp"
                android:textColor="#050505"
                android:textAllCaps="true"
                android:textAlignment="center"
                android:textSize="25sp"
                android:textStyle="bold"
                android:background="@color/green"/>



            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Total Cases"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvCases"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>
            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#E0E0E0"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Recovered"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvRecovered"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#E0E0E0"/>

            <!-- Repeat similar pattern for other statistics -->
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Critical"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvCritical"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#E0E0E0"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Active"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvActive"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#E0E0E0"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Today Cases"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvTodayCases"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#E0E0E0"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Total Deaths"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvTotalDeaths"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#E0E0E0"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Today Deaths"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvTodayDeaths"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="1dp"
                android:background="#E0E0E0"/>

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:gravity="center_vertical"
                android:padding="8dp">

                <TextView
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_weight="1"
                    android:fontFamily="sans-serif-medium"
                    android:text="Affected Countries"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

                <TextView
                    android:id="@+id/tvAffectedCountries"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="0"
                    android:textAlignment="textEnd"
                    android:textColor="@color/color_one"
                    android:textSize="18sp"
                    android:textStyle="bold"/>

            </LinearLayout>

        </LinearLayout>
    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

After using this code in .xml file, the UI will be like:

Layout

Step 4: Working with Java file

We can break the whole application into multiple steps:

Creating instance of TextViews and attach them with the views available in the Layouts(To Display the whole data).
Creating Volley newRequestQueue , it is resonsible for managing Network request in Android.
After that we need a API for collecting data for the application. [ Check on this API : "https://disease.sh/v3/covid-19/all" ]
Extract Data from the API in JSON format using volley and update the values in the Application.
Run the Application in your device.

Note: Remember that the parameter inside the getString() must match with the name given in JSON format.

MainActivity.java:

Java

package com.gfg.covid_java;

import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONException;
import org.json.JSONObject;

public class MainActivity extends AppCompatActivity {
    private TextView tvCases, tvRecovered, tvCritical, tvActive,
    private TextView tvTodayCases, tvTotalDeaths, tvTodayDeaths, tvAffectedCountries;
    private RequestQueue queue;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // API with Covid Data
        String url="https://disease.sh/v3/covid-19/all";

        tvCases = findViewById(R.id.tvCases);
        tvRecovered = findViewById(R.id.tvRecovered);
        tvCritical = findViewById(R.id.tvCritical);
        tvActive = findViewById(R.id.tvActive);
        tvTodayCases = findViewById(R.id.tvTodayCases);
        tvTotalDeaths = findViewById(R.id.tvTotalDeaths);
        tvTodayDeaths = findViewById(R.id.tvTodayDeaths);
        tvAffectedCountries = findViewById(R.id.tvAffectedCountries);

        queue = Volley.newRequestQueue(this);

        // Creating JSON Object Request from URL
        JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, url, null,
        new Response.Listener<JSONObject>() {
            
            //Responsible for Reading data in JSON format
            
            @Override
            public void onResponse(JSONObject response) {
                try{
                    
                    //Updating the data in the Layout elements
                    tvCases.setText(String.format("%,d", response.getInt("cases")));
                    tvRecovered.setText(String.format("%,d", response.getInt("recovered")));
                    tvCritical.setText(String.format("%,d", response.getInt("critical")));
                    tvActive.setText(String.format("%,d", response.getInt("active")));
                    tvTodayCases.setText(String.format("%,d", response.getInt("todayCases")));
                    tvTotalDeaths.setText(String.format("%,d", response.getInt("deaths")));
                    tvTodayDeaths.setText(String.format("%,d", response.getInt("todayDeaths")));
                    tvAffectedCountries.setText(String.format("%,d", response.getInt("affectedCountries")));

                }
                catch (JSONException e){
                    e.printStackTrace();
                    
                    // Making Toast if error occurs
                    Toast.makeText(MainActivity.this, "Error fetching data", Toast.LENGTH_SHORT).show();
                }
            }
        }, error -> {
            
            // Handle error
            Log.e("COVID_DATA", "Error fetching data", error);
                    
            // Making Toast if error occurs
            Toast.makeText(MainActivity.this, "Network error. Please check your connection.",
                            Toast.LENGTH_SHORT).show();
        });

        // Add the request to the RequestQueue.
        queue.add(req);

    }

    @Override
    protected void onStop() {
        super.onStop();
        
        // Cancel any pending requests when the activity stops
        if (queue != null) {
            queue.cancelAll(this);
        }
    }
}

Output:

Output

Complete guide on How to build a Video Player in Android

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AmiyaRanjanRout

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