SashiDo 및 Teachable Machine으로 간단한 Android 손 제스처 앱을 만드는 방법

This tutorial is based on an app I created called FunSchool. FunSchool is an app that uses a ML model to teach ASL letters. The app uses SashiDo for its database and Push Notifications and Teachable Machine for the ML model. Below is a short runthrough of the layout of the app and the ML model. The ML model is trained on Teachable Machine and is hosted on github. Here is the github repository for the whole project for your convenience!

Ok, now that we have created our app on SashiDo, we now have to make our app on Android Studio.

To make your app have access to the internet, go to your AndroidManifest.xml file (app>manifests>AndroidManifest.xml) and add this code before the application tag.

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

Add this code in the “application” section in the AndroidManifest.xml file

<meta-data
   android:name="com.parse.SERVER_URL"
   android:value="@string/SashiDo_server_url" />
<meta-data
   android:name="com.parse.APPLICATION_ID"
   android:value="@string/SashiDo_app_id" />
<meta-data
   android:name="com.parse.CLIENT_KEY"
   android:value="@string/SashiDo_client_key" />

Now go to the strings.xml file (app>res>values>strings.xml) and add this code

<string name="SashiDo_server_url">https://pg-app-tcbt8h75fl11zv9cv0zqzes6ebsjef.scalabl.cloud/1//</string>

<string name="SashiDo_app_id">[your app id here]</string>
<string name="SashiDo_client_key">[your client key here]</string>

Copy-paste your app id and client key from SashiDo. The server URL is under the API URL address box in SashiDo.

Now create a java class in Android studio called “App” that extends “Application” (You can do that by going to file>New>Java Class). Import the following:

import com.parse.Parse;

The class name should look like this:

public class App extends Application {

Now inside the class, inside the onCreate() function, add this code:

import android.app.Application;
import com.parse.Parse;

public class App extends Application {
   public void onCreate(){
       super.onCreate();
       Parse.initialize(new Parse.Configuration.Builder(this)
               .applicationId(getString(R.string.SashiDo_app_id))
               .clientKey(getString(R.string.SashiDo_client_key))
               .server(getString(R.string.SashiDo_server_url))
               .build()
       );
          }
}

In the AndroidManifest.xml file, add this line inside the application tag

android:name=".App"

Now let’s test! In the main activity of your app, add this code:

ParseInstallation.getCurrentInstallation().saveInBackground();

Click run, and go to your SashiDo database. You should see the installation in your database.

Now, this is the fun part! I recommend drawing a simple sketch of the layout of your app on a piece of paper. Once you are done with that, you can make a prototype of your app. My personal favorite prototyping tool is figma as it’s completely free and super easy to use. If you want to check out my design, then you can take a look at the gif in “About this Project” section of this tutorial. Once you know exactly how your app is going to look like, convert the design into Android studio. You must have the UI of your app ready before going on to the next step. If you are making a User Registration page, then check out the next section, where I’ll go through how to make the User Registration Page functional using Parse.

Before we get started coding, first initialize all of your EditTexts and Buttons that need functionality. Reminder: Use findViewById() to initialize the EditTexts, Buttons, or whatever needs functionality in your UI

Ok, now look at this code!

ParseUser user = new ParseUser();
user.setUsername(<Name for proper EditText>.getText().toString());
user.setPassword(<Name for proper EditText>.getText().toString());
user.signUpInBackground(new SignUpCallback() {
   @Override
   public void done(ParseException e) {
       if (e == null) {
           display("Thank you for Registering!","Welcome" + <Call EditText with username/email> + "!");
       } else {
           ParseUser.logOut();
           Toast.makeText(<This Activity’s name>.this, e.getMessage(), Toast.LENGTH_LONG).show();
       }
   }
});

The first line of this code makes a new ParseUser. The text in <> is what you need to change. For example, if you initialized the EditText as emailId for the user’s username, then the 3rd line will be: user.setUsername(emailId.getText().toString());
This code should be run when your “SignUp” or “Register” button is clicked. So, call the onClick method first, then put this code in the method.

In the if block, you probably noticed that I called a function called Display(). This function will display our message if the registration was successful. Here’s the code for this function.

private void display(String title,String message){
   AlertDialog.Builder builder = new AlertDialog.Builder(<Name of this Activity>.this)
           .setTitle(title)
           .setMessage(message)
           .setPositiveButton("OK", new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which) {
                   dialog.cancel();

                   Intent intent = new Intent(<Name of this Activity>.this, <Name of the next Activity>.class);
                   intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                   startActivity(intent);
               }
           });
   AlertDialog ok = builder.create();
   ok.show();
}

Same thing with this code. Replace the text in <> to your activity’s names.

Android studio should have automatically imported all the necessary imports, but if for some reason, it didn’t, here are the imports you need:

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;
import com.parse.Parse;
import com.parse.ParseException;
import com.parse.ParseUser;
import com.parse.SignUpCallback;

This code closely resembles the signUp code with some alterations. Here’s the code:

ParseUser.logInInBackground(<Call your EditText for username>.toString(), <Call your EditText for password>.getText().toString(), new LogInCallback() {
   @Override
   public void done(ParseUser parseUser, ParseException e) {
       if (parseUser != null) {
           alertDisplayer("Login Successful", "Welcome back" + <Call your EditText for Username>.getText().toString() + "!");
       } else {
           ParseUser.logOut();
           Toast.makeText(<This Activity’s name>.this, e.getMessage(), Toast.LENGTH_LONG).show();
       }
   }
});

Again, replace the <> with code from your activity. Make sure to change the name of the activities to resemble your project.
This code should run after the login button is clicked. So, remember to put this code in the OnClick method.

Here’s the display() function again:

private void display(String title,String message){
   AlertDialog.Builder builder = new AlertDialog.Builder(<Name of this Activity>.this)
           .setTitle(title)
           .setMessage(message)
           .setPositiveButton("OK", new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which) {
                   dialog.cancel();

                   Intent intent = new Intent(<Name of this Activity>.this, <Name of the next Activity>.class);
                   intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                   startActivity(intent);
               }
           });
   AlertDialog ok = builder.create();
   ok.show();
}

Logging out is simple in Parse. Once you set the onClick method for your logout button, put this line in the method:

ParseUser.logOut();

Now it’s time for push notifications!

While I had some experience with Android Studio, I was completely new to Parse and SashiDo, so starting the process of creating this app was a bit daunting at the beginning and I almost dropped the project. Though I read numerous documentations and watched many YouTube videos, I gained control over the process only when I designed my app through Android Studio, and so I decided to explore SashiDo further. Once I put what I’ve learned in theory about SashiDo into practice, the parts of my knowledge from different sources began to come together, like puzzle pieces. I found myself successfully connecting my app, making User Registration pages, and Push Notifications in just a matter of hours. All through SashiDo! As I continued my journey through SashiDo, I started loving the platform more and more. It was incredibly easy to use with a very well thought out design, and its ready-to-use API’s saved me hours of coding. The best part of SashiDo, however, was its customer service and I believe that definitely sets it apart from its competitors. Their representatives are super super nice and love to help. Big shoutout to Vesi and Irena, who were always super friendly and helped me so much through my experience!

Before I end this tutorial, I want to deeply thank SashiDo for the opportunity to use their wonderful platform and you for taking the time to read through all of this. I truly hope that this tutorial helps you in your journey. Remember that this tutorial is only the starting point. With SashiDo, you can develop anything from websites to IOS apps to even hosting ML models. SashiDo makes everything easier, so look no further when you need a good platform for your projects.

Happy coding!