How does Audio recording work internally in Android SDK?

Audio recording in Android SDK involves the use of the MediaRecorder class, which provides a simple way to capture audio and save it to a file. The process generally includes setting up the audio source, output format, encoder, and the output file location. Here is a basic overview of how audio recording works internally:

Permissions: Requires permission to record audio in the AndroidManifest.xml file.
Initialization: Create an instance of the MediaRecorder class.
Configuration: Set the audio source, output format, and encoder settings.
Start Recording: Call the start() method to begin recording audio.
Stop Recording: Call the stop() method to stop recording.

Here is a simple example of audio recording in Android using Java:


        import android.Manifest;
        import android.content.pm.PackageManager;
        import android.media.MediaRecorder;
        import android.os.Environment;
        import androidx.annotation.NonNull;
        import androidx.appcompat.app.AppCompatActivity;
        import android.os.Bundle;
        import android.view.View;
        import android.widget.Button;

        public class MainActivity extends AppCompatActivity {

            private MediaRecorder mediaRecorder;
            private String audioFilePath;

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

                audioFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/audio_record.3gp";

                Button recordButton = findViewById(R.id.recordButton);
                recordButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        startRecording();
                    }
                });

                Button stopButton = findViewById(R.id.stopButton);
                stopButton.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        stopRecording();
                    }
                });
            }

            private void startRecording() {
                mediaRecorder = new MediaRecorder();
                mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                mediaRecorder.setOutputFile(audioFilePath);

                try {
                    mediaRecorder.prepare();
                    mediaRecorder.start();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }

            private void stopRecording() {
                mediaRecorder.stop();
                mediaRecorder.release();
                mediaRecorder = null;
            }
        }

How does Audio recording work internally in Android SDK?

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How does Audio recording work internally in Android SDK?

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