上一篇讲到了使用意图录音，这篇文章将使用MediaRecorder类来录音，从而提供更多的灵活性。

效果图：

源代码奉上：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/statusTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Status"
        android:gravity="center_horizontal" />

    <Button
        android:id="@+id/button_startRecording"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="开始录音" />

    <Button
        android:id="@+id/button_stopRecording"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="停止录音" />

    <Button
        android:id="@+id/button_playRecording"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="播放录音" />

    <Button
        android:id="@+id/button_finish"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="完成" />

</LinearLayout>

package com.multimediademo9mediarecorder;

import java.io.File;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener,
		OnCompletionListener {
	private TextView statusTextView;
	private Button button_startRecording, button_stopRecording,
			button_playRecording, button_finish;
	private MediaRecorder recorder;
	private MediaPlayer player;
	private File audioFile;

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

		init();
	}

	/**
	 * 实例化组件
	 */
	private void init() {
		statusTextView = (TextView) findViewById(R.id.statusTextView);
		// 当运行Activity时，将statusTextView的文本设置为“Ready”。
		statusTextView.setText("Ready");

		button_startRecording = (Button) findViewById(R.id.button_startRecording);
		button_playRecording = (Button) findViewById(R.id.button_playRecording);
		button_stopRecording = (Button) findViewById(R.id.button_stopRecording);
		button_finish = (Button) findViewById(R.id.button_finish);

		button_startRecording.setOnClickListener(this);
		button_playRecording.setOnClickListener(this);
		button_stopRecording.setOnClickListener(this);
		button_finish.setOnClickListener(this);

		button_playRecording.setEnabled(false);
		button_stopRecording.setEnabled(false);

		player = new MediaPlayer();
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.button_startRecording:
			try {
				/**
				 * 当点击开始录音按钮时，将构造一个新的MediaRecorder，并调用setAudioSource、
				 * setOutputFormat和setAudioEncoder方法。
				 */
				recorder = new MediaRecorder();
				recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
				recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
				recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
				/**
				 * 然后在SD卡上创建一个新的File对象，并调用MediaRecorder对象上的setOutputFile方法。
				 */
				File path = new File(Environment.getExternalStorageDirectory()
						.getAbsoluteFile() + "/files/");
				path.mkdir();
				audioFile = File.createTempFile("recording", ".3gp", path);
				recorder.setOutputFile(audioFile.getAbsolutePath());
				/**
				 * 调用MediaRecorder上的prepare方法，并开始录制。
				 */
				recorder.prepare();
				recorder.start();
				/**
				 * 最后更新statusTextView，并且更改那些按钮会被启用或禁用。
				 */
				statusTextView.setText("Recording");
				button_playRecording.setEnabled(false);
				button_stopRecording.setEnabled(true);
				button_startRecording.setEnabled(false);
			} catch (Exception e) {
				e.printStackTrace();
			}
			break;
		case R.id.button_playRecording:
			/**
			 * 播放录音，使用MediaPlayer构造的对象player
			 */
			player.start();
			statusTextView.setText("playing");
			button_playRecording.setEnabled(false);
			button_stopRecording.setEnabled(false);
			button_startRecording.setEnabled(false);
			break;
		case R.id.button_stopRecording:
			/**
			 * 停止录制，并释放MediaRecorder对象。
			 */
			try {
				recorder.stop();
				recorder.release();

				player.setOnCompletionListener(this);
				player.setDataSource(audioFile.getAbsolutePath());
				player.prepare();
				statusTextView.setText("Ready to Play!!");
				button_playRecording.setEnabled(true);
				button_stopRecording.setEnabled(false);
				button_stopRecording.setEnabled(false);
			} catch (Exception e) {
				e.printStackTrace();
			}
			break;
		case R.id.button_finish:
			finish();
			break;
		default:
			break;
		}
	}

	@Override
	public void onCompletion(MediaPlayer mp) {
		button_playRecording.setEnabled(true);
		button_startRecording.setEnabled(true);
		button_stopRecording.setEnabled(false);
		statusTextView.setText("Ready...");
	}

}

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