Android录音及播放功能实现

【Main.java】

package net.blogjava.mobile.record;

import java.io.File;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class Main extends Activity implements OnClickListener {
	private MediaPlayer mediaPlayer;
	private MediaRecorder mediaRecorder = new MediaRecorder();
	private File audioFile;

	@Override
	public void onClick(View view) {
		try {
			String msg = "";
			switch (view.getId()) {
			case R.id.btnStart:
				mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
				mediaRecorder
						.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
				mediaRecorder
						.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
				audioFile = File.createTempFile("record_", ".wav");
				Log.d("Main", audioFile.getAbsolutePath());
				mediaRecorder.setOutputFile(audioFile.getAbsolutePath());
				mediaRecorder.prepare();
				mediaRecorder.start();
				msg = "正在录音...";
				break;
			case R.id.btnStop:
				if (audioFile != null) {
					mediaRecorder.stop();
				}
				msg = "已经停止录音.";
				break;
			case R.id.btnPlay:
				if (audioFile != null) {
					mediaPlayer = new MediaPlayer();
					mediaPlayer.setDataSource(audioFile.getAbsolutePath());
					mediaPlayer.prepare();

					mediaPlayer.start();
					mediaPlayer
							.setOnCompletionListener(new OnCompletionListener() {
								@Override
								public void onCompletion(MediaPlayer mp) {
									setTitle("录音播放完毕.");
								}
							});
					msg = "正在播放录音...";
				}
				break;
			}
			setTitle(msg);
			Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
		} catch (Exception e) {
			setTitle(e.getMessage());
		}
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		Button btnStart = (Button) findViewById(R.id.btnStart);
		Button btnStop = (Button) findViewById(R.id.btnStop);
		Button btnPlay = (Button) findViewById(R.id.btnPlay);
		btnStart.setOnClickListener(this);
		btnStop.setOnClickListener(this);
		btnPlay.setOnClickListener(this);
	}
}

【main.xml】

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/btnStart"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="录音" />

    <Button
        android:id="@+id/btnStop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="停止" />

    <Button
        android:id="@+id/btnPlay"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="播放" />

</LinearLayout>

【注意清单文件别忘记加权限】

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