以下是一个简单的示例代码，展示如何在Android应用中实现音频录制功能：

1. 在您的Android项目中的AndroidManifest.xml文件中添加以下权限：

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

2. 在您的Activity或Fragment中，添加以下代码：

import android.Manifest;
import android.content.pm.PackageManager;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private static final int PERMISSION_REQUEST_CODE = 1;
    private MediaRecorder mediaRecorder;
    private String audioFilePath;

    private Button recordButton;
    private boolean isRecording = false;

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

        recordButton = findViewById(R.id.record_button);
        audioFilePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/recorded_audio.3gp";

        recordButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isRecording) {
                    stopRecording();
                } else {
                    startRecording();
                }
            }
        });

        if (!hasPermissions()) {
            requestPermissions();
        }
    }

    private boolean hasPermissions() {
        int recordPermission = ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO);
        int storagePermission = ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE);
        return recordPermission == PackageManager.PERMISSION_GRANTED && storagePermission == PackageManager.PERMISSION_GRANTED;
    }

    private void requestPermissions() {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_REQUEST_CODE) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(this, "Permissions granted", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(this, "Permissions denied", Toast.LENGTH_SHORT).show();
            }
        }
    }

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

        try {
            mediaRecorder.prepare();
            mediaRecorder.start();
            recordButton.setText("Stop Recording");
            isRecording = true;
            Toast.makeText(this, "Recording started", Toast.LENGTH_SHORT).show();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void stopRecording() {
        mediaRecorder.stop();
        mediaRecorder.release();
        mediaRecorder = null;
        recordButton.setText("Start Recording");
        isRecording = false;
        Toast.makeText(this, "Recording stopped", Toast.LENGTH_SHORT).show();
    }
}

3. 在您的布局文件（例如activity_main.xml）中添加一个按钮：

<Button
    android:id="@+id/record_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Start Recording" />

这个示例代码创建了一个简单的音频录制应用程序。当用户点击按钮时，应用程序将开始录制音频，再次点击按钮将停止录制。

关于Android多媒体技术的更详细的文章，您可以参考以下链接：

1. Android官方文档 – MediaRecorder
2. Android官方文档 – Audio and Video
3. Android音频录制教程
4. Android多媒体开发指南

这些资源将提供更全面的指导，帮助您深入了解Android应用中的音频录制和多媒体技术。