Sending Voice Notes in Android Using Kotlin, Node JS, and MongoDB

In this article, we will discuss how to send voice notes in Android using Kotlin, and store the data in a MongoDB database using Node.js.

To start, we need to create a new Android application using Kotlin. We will use the MediaRecorder class to record the voice notes. Here is a simple example of how to record a voice note in Android using Kotlin:

“`kotlin
val outputFile: String = “${externalCacheDir?.absolutePath}/audiorecording.3gp”
val mediaRecorder = MediaRecorder()

// Set the audio source and output format
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC)
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)
mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)
mediaRecorder.setOutputFile(outputFile)

// Start recording
mediaRecorder.prepare()
mediaRecorder.start()

// Stop recording
mediaRecorder.stop()
mediaRecorder.release()
“`

Once the voice note is recorded, we can send it to a Node.js server using a POST request. We can use the Retrofit library to make the HTTP request. Here is an example of how to send the voice note to a Node.js server:

“`kotlin
val file = File(outputFile)
val requestFile: RequestBody = file.asRequestBody(“multipart/form-data”.toMediaTypeOrNull())
val body: MultipartBody.Part = MultipartBody.Part.createFormData(“file”, file.name, requestFile)

val request = ServiceGenerator.createService(ApiService::class.java)
val call: Call = request.uploadVoiceNote(body)

call.enqueue(object : Callback {
override fun onResponse(call: Call, response: Response) {
if (response.isSuccessful) {
// Voice note uploaded successfully
} else {
// Handle error
}
}

override fun onFailure(call: Call, t: Throwable) {
// Handle failure
}
})
“`

Now that the voice note is sent to the Node.js server, we need to store it in a MongoDB database. We can use the official MongoDB Node.js driver to connect to the database and insert the voice note. Here is an example of how to insert the voice note into a MongoDB database using Node.js:

“`javascript
const MongoClient = require(‘mongodb’).MongoClient;

const url = ‘mongodb://localhost:27017’;
const dbName = ‘mydb’;

MongoClient.connect(url, (err, client) => {
if (err) throw err;

const db = client.db(dbName);
const collection = db.collection(‘voiceNotes’);

const voiceNote = {
filename: ‘audiorecording.3gp’,
filepath: ‘/path/to/audiorecording.3gp’
};

collection.insertOne(voiceNote, (err, result) => {
if (err) throw err;
console.log(‘Voice note inserted into MongoDB’);
});

client.close();
});
“`

In this example, we connect to the MongoDB database, insert the voice note into a collection called ‘voiceNotes’, and close the connection.

In conclusion, we have discussed how to send voice notes in Android using Kotlin, and store the data in a MongoDB database using Node.js. By following these examples, you can easily implement voice note functionality in your Android application and store the data in a MongoDB database.