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How to Build a TODO Android Application with AWS DynamoDB as Database?
  • Difficulty Level : Easy
  • Last Updated : 04 Feb, 2021

This is a TODO application made on android studio IDE, code is written in JAVA, and data store in AWS DynamoDB and fetch to the home screen. The connection established between the application and AWS through Amplify CLI and the data is successful gets stored by creating a TODO Table in DynamoDB, a Schema is also created which shows the structure of data. The data fetched successfully and displayed on the home page of the application. The aim of this project is to show how to connect your android applications with AWS and use the AWS resources(DynamoDB). A sample video is given below to get an idea about what we are going to do in this article.

Before jumping to the implementation have a look at the following terms.

  • Amplify CLI: Amplify Command Line Interface (CLI)  is a combined toolchain to create, integrate, and manage the AWS cloud services/resources for your application. 
  • DynamoDB: It is a fast and flexible NoSQL database. It is a fully managed database that helps you with both document and key-value data models.

Prerequisite: Install Node.js (version 10.x) install NPM (version 6.x), create an AWS account if you don’t have one, install android studio (version 4.0 or higher), android SDK API level 29(android 10), install amplify CLI (write following on the command prompt).

npm install -g @aws-amplify/cli

Step by Step Implementation

1. Configuring Amplify CLI

Step 1: Write the following on the command prompt



amplify configure

Install Amplify

Step 2: If you have already created an IAM user then write “Do you want to use an AWS profile? Yes” and then write below its accessKeyId and secretAccessKey otherwise write “Do you want to use an AWS profile? No” create an IAM user and use its accessKeyId and secretAccessKey.

Configure Amplify

Give permissions

User created

Step 3: Write the following in order to initialize the new Amplify project

amplify init

Initialize Amplify

Step 4: Create backend API by using GraphQL query language then use “amplify publish” to deploy it

amplify add api

amplify push



amplify publish

Add API to your backend

2. Integrate AWS to the android studio with the help of  amplify

Step 1: Add the following in the dependencies of build.gradle (Project: Todo) in Gradle Scripts

buildscript {
   repositories {
       google()
       jcenter()
   }

   dependencies {
       classpath 'com.android.tools.build:gradle:4.1.1'

       // Add this line into `dependencies` in `buildscript`
       classpath 'com.amplifyframework:amplify-tools-gradle-plugin:1.0.2'
   }
}

allprojects {
   repositories {
       google()
       jcenter()
   }
}

// Add this line at the end of the file
apply plugin: 'com.amplifyframework.amplifytools'

Step 2: Add the following in the dependencies of build.gradle (Module: app) in Gradle Scripts. Run Gradle Sync

dependencies {
    implementation 'com.amplifyframework:aws-api:1.6.9'
    implementation 'com.amplifyframework:aws-datastore:1.6.9'
}

Step 3: In android studio go to Project -> amplify -> app -> backend -> api -> schema.graphql

type Todo @model {
  id: ID!
  name: String!
  description: String
}

Step 4: Add the following code in MainActivity & MainActivity2 in the onCreate() method to initialize Amplify

 try {
     Amplify.addPlugin(new AWSDataStorePlugin());
     Amplify.configure(getApplicationContext());

     Log.i("Tutorial", "Initialized Amplify");
 } catch (AmplifyException e) {
     Log.e("Tutorial", "Could not initialize Amplify", e);
 }

Step 5:  Add the following code in MainActivity2 in the onCreate() method to creates a Todo item with two properties: a name and a description

 Todo todo = Todo.builder()
                        .name(name1)
                        .description(name2)
                        .build();

Step 6: Add the following code in MainActivity2 in the onCreate() method to save items using mutate

 Amplify.API.mutate(
                     ModelMutation.create(todo),
                     response -> Log.i("MyAmplifyApp", "Added Todo with id: " + response.getData().getId()),
                     error -> Log.e("MyAmplifyApp", "Create failed", error)
                );

Go to your AWS management console -> AppSync -> Select your API -> Data Sources -> select todo table -> items

Data successfully stored

Step 7:  Add the following code in MainActivity in the onCreate() method to fetch data/run queries to retrieve the stored data

 Amplify.API.query(
                ModelQuery.list(Todo.class),
                response -> {
                    for (Todo todo : response.getData()) {
                        ls.add(todo.getName());
                        Log.i("MyAmplifyApp", todo.getName());
                    }
                },
                error -> Log.e("MyAmplifyApp", "Query failure", error)
        );

Below are the complete codes for:

MainActivity file(Home page of App)

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">
  
    <ListView
        android:id="@+id/lt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">
    </ListView>
    
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="221dp"
        android:layout_height="53dp"
        android:layout_alignParentRight="true"
        android:layout_alignParentBottom="true"
        android:layout_marginEnd="25dp"
        android:layout_marginRight="25dp"
        android:layout_marginBottom="70dp"
        android:clickable="true"
        app:srcCompat="@android:drawable/ic_input_add" />
    
</RelativeLayout>

Java




package com.example.shreyaawsapp;
  
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.amplifyframework.AmplifyException;
import com.amplifyframework.api.aws.AWSApiPlugin;
import com.amplifyframework.api.graphql.model.ModelQuery;
import com.amplifyframework.core.Amplify;
import com.amplifyframework.datastore.generated.model.Todo;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import java.util.ArrayList;
import java.util.List;
  
public class MainActivity extends AppCompatActivity {
      
      // declaration
    public FloatingActionButton btn;
    public ListView lv;
    public String[] st;
    int i = 0;
    Handler handler;
      
      // the array adapter converts an ArrayList of objects
    // into View items filled into the ListView container
    ArrayAdapter<String> arrayAdapter;
      
      // list to store data
    public static List<String> ls;
  
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
          
          // provide id to the layout items
        btn = findViewById(R.id.fab);
        st = new String[100];
  
        lv = findViewById(R.id.lt);
          
          // set listener to the floating button which takes
        // you to the next activity where you add and sore
        // your data
        btn.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v)
            {
                Intent intent = new Intent(MainActivity.this, MainActivity2.class);
                startActivity(intent);
            }
        });
        ls = new ArrayList<String>();
         
          // add the code below to initialize Amplpify
        try {
            // Add these lines to add the AWSApiPlugin plugins
            Amplify.addPlugin(new AWSApiPlugin());
            Amplify.configure(getApplicationContext());
            Log.i("MyAmplifyApp", "Initialized Amplify");
        }
        catch (AmplifyException error) {
            Log.e("MyAmplifyApp", "Could not initialize Amplify", error);
        }
         
          // add the code below to fetch 
          // data/run queries to
        // retrieve the stored data
        Amplify.API.query(ModelQuery.list(Todo.class), response -> {
                for (Todo todo : response.getData()) {
                    ls.add(todo.getName());
                    Log.i("MyAmplifyApp", todo.getName());
                }
            },
            error -> Log.e("MyAmplifyApp", "Query failure", error));
        
        handler = new Handler();
        final Runnable r = new Runnable() {
            public void run()
            {
                handler.postDelayed(this, 2000);
                arrayAdapter = new ArrayAdapter<String>(
                    getApplicationContext(),
                    android.R.layout.simple_list_item_1,
                    ls);
                lv.setAdapter(arrayAdapter);
                arrayAdapter.notifyDataSetChanged();
            }
        };
        handler.postDelayed(r, 1000);
    }
}

MainActivity2 file(Write notes page)

XML




<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity2">
  
    <EditText
        android:id="@+id/edname"
        android:layout_width="347dp"
        android:layout_height="54dp"
        android:layout_marginTop="110dp"
        android:ems="10"
        android:hint="Title"
        android:inputType="textPersonName"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
  
    <EditText
        android:id="@+id/eddes"
        android:layout_width="347dp"
        android:layout_height="54dp"
        android:layout_marginTop="216dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="Description"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
  
    <Button
        android:id="@+id/button2"
        android:layout_width="134dp"
        android:layout_height="53dp"
        android:layout_marginStart="138dp"
        android:layout_marginTop="69dp"
        android:layout_marginEnd="138dp"
        android:text="Store in data"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/eddes" />
  
</androidx.constraintlayout.widget.ConstraintLayout>

Java




package com.example.shreyaawsapp;
  
import android.content.Intent;
import android.net.wifi.p2p.WifiP2pManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.amplifyframework.AmplifyException;
import com.amplifyframework.api.aws.AWSApiPlugin;
import com.amplifyframework.api.graphql.model.ModelMutation;
import com.amplifyframework.api.graphql.model.ModelQuery;
import com.amplifyframework.core.Amplify;
import com.amplifyframework.datastore.generated.model.Todo;
import java.util.ArrayList;
import java.util.List;
  
public class MainActivity2 extends AppCompatActivity {
    
    // declaration
    public EditText name, desc;
    public Button btn;
  
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        // give id to the items
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        name = findViewById(R.id.edname);
        desc = findViewById(R.id.eddes);
        btn = findViewById(R.id.button2);
        
        // add the code below to initialize Amplify
        try {
            // Add these lines to add the AWSApiPlugin plugins
            Amplify.addPlugin(new AWSApiPlugin());
            Amplify.configure(getApplicationContext());
            Log.i("MyAmplifyApp", "Initialized Amplify");
        }
        catch (AmplifyException error) {
            Log.e("MyAmplifyApp", "Could not initialize Amplify", error);
        }
        // set listener on the store data button to store
        // data in dynamoDB
        btn.setOnClickListener(new View.OnClickListener() {
            @Override public void onClick(View v)
            {
                String name1 = name.getText().toString();
                String name2 = desc.getText().toString();
                // add the code below to create a toto item
                // with two properties a name and a
                // description
                Todo todo = Todo.builder()
                                .name(name1)
                                .description(name2)
                                .build();
                // add the code below  to save item using mutate
                Amplify.API.mutate(ModelMutation.create(todo), response -> Log.i(
                        "MyAmplifyApp", "Added Todo with id: " + response.getData().getId()),
                    error
                    -> Log.e("MyAmplifyApp", "Create failed", error));
            }
        });
    }
    // move to the next activity
    @Override public void onBackPressed()
    {
        super.onBackPressed();
        startActivity(new Intent(MainActivity2.this, MainActivity.class));
    }
}

Output: 

Source Code: https://github.com/shreya593/Shreyaawsapp.git

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