上一篇讲到了使用意图录音。这篇文章将使用MediaRecorder类来录音，从而提供很多其它的灵活性。

效果图：

源码奉上：

<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="開始录音" />

    <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="完毕" />

</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);

		// 当执行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 {

				/**

				 * 当点击開始录音按钮时，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。并開始录制。

				 */

				recorder.prepare();

				recorder.start();

				/**

				 * 最后更新statusTextView，而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...");

	}

}

源码下载：

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