android 录音机&示波器 -

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android 录音机&示波器

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android 录音机文件列表

1、功能需求

1. 软件运行平台为android平台

2、性能要求

1. 应用软件可以适应不同android硬件平台

2. 要求提供源码，最好封装为函数库。

3. 支持平台：Android1.6 Android2.0 Android2.1 Android2.2（及以上平台）

4. 支持的手机分辨率：320x240 320x480 480x800 (具有自适应性)

5. 可以根据重力感应切换屏幕方向

6. 要求声音的实时波形显示

7. 录音的时间长度显示

8. 文件名自动按照系统时间保存，如20120601.amr

9. 在可以列出历史录音列表（文件列表）

关键代码如下：

package com.android.record;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;

import com.android.record.Draw.DrawThread;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.Chronometer;

/**
 * class name：TestAudioRecord<BR>
 * class description：用AudioRecord来进行录音<BR>
 * PS： <BR>
 * 
 * @version 1.00 2012/07/17
 * @author CODYY)liangqinsheng
 */
public class SoundRecord extends Activity {
    // 音频获取源
    private int audioSource = MediaRecorder.AudioSource.MIC;
    // 设置音频采样率，44100是目前的标准，但是某些设备仍然支持22050，16000，11025
    private static int sampleRateInHz = 8000;
    // 设置音频的录制的声道CHANNEL_IN_STEREO为双声道，CHANNEL_CONFIGURATION_MONO为单声道
    private static int channelConfig = AudioFormat.CHANNEL_IN_STEREO;
    // 音频数据格式:PCM 16位每个样本。保证设备支持。PCM 8位每个样本。不一定能得到设备支持。
    private static int audioFormat = AudioFormat.ENCODING_PCM_16BIT;
    // 缓冲区字节大小
    private int bufferSizeInBytes = 0;
    private Button mRecordButton;
    private Button mStopButton;
    private Button mPauseButton;
    private Button mListButton;
    private AudioRecord audioRecord;
    private boolean isRecord = false;// 设置正在录制的状态
    // AudioName裸音频数据文件
    private static final String AudioName = "/sdcard/record_sound/love.3gpp";
    // NewAudioName可播放的音频文件
    private static String NewAudioName = "/sdcard/record_sound/new.wav";

    // private ArrayList<String> recordFiles;
    private SimpleDateFormat sdf;

    private int mPause = 0;
    private Chronometer chronometer;
    private long passTime;
    Paint mPaint;
    SurfaceView sfv;
    public ArrayList<short[]> inBuf = new ArrayList<short[]>();
    public int baseLine = 0;
    public int rateX = 16;
    public int rateY = 5;

    public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	getWindow().setFormat(PixelFormat.TRANSLUCENT);// 让界面横屏
	requestWindowFeature(Window.FEATURE_NO_TITLE);// 去掉界面标题
	getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
		WindowManager.LayoutParams.FLAG_FULLSCREEN);
	// 重新设置界面大小
	setContentView(R.layout.main);
	sdf = new SimpleDateFormat("yyMMddhhmmss");
	sfv = (SurfaceView) this.findViewById(R.id.surfaceView);
	mPaint = new Paint();
	mPaint.setColor(Color.GREEN);// 画笔为绿色
	mPaint.setStrokeWidth(1);// 设置画笔粗细
	baseLine = sfv.getHeight();
	init();
    }

    private void init() {
	mRecordButton = (Button) this.findViewById(R.id.recordButton);
	mStopButton = (Button) this.findViewById(R.id.stopButton);
	mPauseButton = (Button) this.findViewById(R.id.pauseButton);
	mListButton = (Button) this.findViewById(R.id.listButton);
	mRecordButton.setOnClickListener(new TestAudioListener());
	mStopButton.setOnClickListener(new TestAudioListener());
	mPauseButton.setOnClickListener(new TestAudioListener());
	mListButton.setOnClickListener(new TestAudioListener());
	chronometer = (Chronometer) findViewById(R.id.chronometer);
	creatAudioRecord();
    }

    private void creatAudioRecord() {
	// 获得缓冲区字节大小
	bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz,
		channelConfig, audioFormat);
	// 创建AudioRecord对象
	audioRecord = new AudioRecord(audioSource, sampleRateInHz,
		channelConfig, audioFormat, bufferSizeInBytes);
    }

    class TestAudioListener implements OnClickListener {
	@Override
	public void onClick(View v) {
	    if (v == mRecordButton) {
		mPause = 0;
		startRecord();
		// 开始记时
		chronometer.setFormat(null);
		chronometer.setBase(SystemClock.elapsedRealtime());
		chronometer.start();
		new DrawThread(sfv, mPaint).start();
	    }
	    if (v == mStopButton) {
		stopRecord();
		chronometer.stop();
		inBuf.clear();// 清除
	    }
	    if (v == mPauseButton) {
		if (mPause == 1) {
		    mPause = 0;
		    chronometer.setBase(chronometer.getBase()
			    + (SystemClock.elapsedRealtime() - passTime));
		    chronometer.start();
		} else {
		    mPause = 1;
		    chronometer.stop();
		    passTime = SystemClock.elapsedRealtime();
		}
	    }
	    if (v == mListButton) {
		Intent intent = new Intent(SoundRecord.this, FileList.class);
		startActivity(intent);
	    }
	}
    }

    private void startRecord() {
	NewAudioName = "/sdcard/record_sound/" + sdf.format(new Date()) + ".wav";
	if (audioRecord == null)
	    audioRecord = new AudioRecord(audioSource, sampleRateInHz,
		    channelConfig, audioFormat, bufferSizeInBytes);
	audioRecord.startRecording();
	// 让录制状态为true
	isRecord = true;
	// 开启音频文件写入线程
	new Thread(new AudioRecordThread()).start();
    }

    private void stopRecord() {
	close();
    }

    private void close() {
	if (audioRecord != null) {
	    System.out.println("stopRecord");
	    isRecord = false;// 停止文件写入
	    audioRecord.stop();
	    audioRecord.release();// 释放资源
	    audioRecord = null;
	}
    }

    class AudioRecordThread implements Runnable {
	@Override
	public void run() {

	    writeDateTOFile();// 往文件中写入裸数据isRecord
	    copyWaveFile(AudioName, NewAudioName);// 给裸数据加上头文件
	}
    }

    /**
     * 这里将数据写入文件，但是并不能播放，因为AudioRecord获得的音频是原始的裸音频， 如果需要播放就必须加入一些格式或者编码的头信息。
     */
    private void writeDateTOFile() {
	// new一个byte数组用来存一些字节数据，大小为缓冲区大小
	byte[] audiodata = new byte[bufferSizeInBytes];
	FileOutputStream fos = null;
	int readsize = 0;
	try {
	    File file = new File(AudioName);
	    if (file.exists()) {
		file.delete();
	    }
	    fos = new FileOutputStream(file);// 建立一个可存取字节的文件
	} catch (Exception e) {
	    e.printStackTrace();
	}
	while (isRecord == true) {
	    readsize = audioRecord.read(audiodata, 0, bufferSizeInBytes);
    	    if(mPause == 0) {
		short[] tmpBuf = new short[readsize / 4];
		for (int i = 0, ii = 0; i < tmpBuf.length; i++, ii = i * 4) {
		    tmpBuf[i] = audiodata[ii];
		}
		synchronized (inBuf) {//
		    inBuf.add(tmpBuf);// 添加数据
		}
	    }
	    if (AudioRecord.ERROR_INVALID_OPERATION != readsize) {
		try {
		    if (mPause == 0 && fos != null)
			fos.write(audiodata);
		} catch (IOException e) {
		    e.printStackTrace();
		}
	    }
	}
	try {
	    fos.close();// 关闭写入流
	} catch (IOException e) {
	    e.printStackTrace();
	}
    }

    /**
     * 这里得到可播放的音频文件
     * 
     * @param inFilename
     * @param outFilename
     */
    private void copyWaveFile(String inFilename, String outFilename) {
	FileInputStream in = null;
	FileOutputStream out = null;
	long totalAudioLen = 0;
	long totalDataLen = totalAudioLen + 36;
	long longSampleRate = sampleRateInHz;
	int channels = 2;
	long byteRate = 16 * sampleRateInHz * channels / 8;
	byte[] data = new byte[bufferSizeInBytes];
	try {
	    in = new FileInputStream(inFilename);
	    out = new FileOutputStream(outFilename);
	    totalAudioLen = in.getChannel().size();
	    totalDataLen = totalAudioLen + 36;
	    int j = 0;
	    WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
		    longSampleRate, channels, byteRate);
	    while (in.read(data) != -1) {
		out.write(data);
		System.out.println("j:" + j);
		j++;
		// out.flush();
	    }

	    in.close();
	    out.close();
	} catch (FileNotFoundException e) {
	    e.printStackTrace();
	} catch (IOException e) {
	    e.printStackTrace();
	}
    }

    /**
     * 44字节的wav头文件信息
     */
    private void WriteWaveFileHeader(FileOutputStream out, long totalAudioLen,
	    long totalDataLen, long longSampleRate, int channels, long byteRate)
	    throws IOException {
	byte[] header = new byte[44];
	header[0] = 'R'; // RIFF/WAVE header
	header[1] = 'I';
	header[2] = 'F';
	header[3] = 'F';
	header[4] = (byte) (totalDataLen & 0xff);
	header[5] = (byte) ((totalDataLen >> 8) & 0xff);
	header[6] = (byte) ((totalDataLen >> 16) & 0xff);
	header[7] = (byte) ((totalDataLen >> 24) & 0xff);
	header[8] = 'W';
	header[9] = 'A';
	header[10] = 'V';
	header[11] = 'E';
	header[12] = 'f'; // 'fmt ' chunk
	header[13] = 'm';
	header[14] = 't';
	header[15] = ' ';
	header[16] = 16; // 4 bytes: size of 'fmt ' chunk
	header[17] = 0;
	header[18] = 0;
	header[19] = 0;
	header[20] = 1; // format = 1
	header[21] = 0;
	header[22] = (byte) channels;
	header[23] = 0;
	header[24] = (byte) (longSampleRate & 0xff);
	header[25] = (byte) ((longSampleRate >> 8) & 0xff);
	header[26] = (byte) ((longSampleRate >> 16) & 0xff);
	header[27] = (byte) ((longSampleRate >> 24) & 0xff);
	header[28] = (byte) (byteRate & 0xff);
	header[29] = (byte) ((byteRate >> 8) & 0xff);
	header[30] = (byte) ((byteRate >> 16) & 0xff);
	header[31] = (byte) ((byteRate >> 24) & 0xff);
	header[32] = (byte) (2 * 16 / 8); // block align
	header[33] = 0;
	header[34] = 16; // bits per sample
	header[35] = 0;
	header[36] = 'd';
	header[37] = 'a';
	header[38] = 't';
	header[39] = 'a';
	header[40] = (byte) (totalAudioLen & 0xff);
	header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
	header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
	header[43] = (byte) ((totalAudioLen >> 24) & 0xff);
	out.write(header, 0, 44);
    }

    @Override
    protected void onDestroy() {
	close();
	super.onDestroy();
    }

	class DrawThread extends Thread {
		private int oldX = 0;// 上次绘制的X坐标
		private int oldY = 0;// 上次绘制的Y坐标
		private SurfaceView sfv;// 画板
		private int X_index = 0;// 当前画图所在屏幕X轴的坐标
		private Paint mPaint;// 画笔
		public DrawThread(SurfaceView sfv, Paint mPaint) {
			this.sfv = sfv;
			this.mPaint = mPaint;
		}
		public void run() {
			while (isRecord) {
				ArrayList<short[]> buf = new ArrayList<short[]>();
				synchronized (inBuf) {
					if (inBuf.size() == 0)
						continue;
					buf = (ArrayList<short[]>) inBuf.clone();// 保存
					inBuf.clear();// 清除
				}
				for (int i = 0; i < buf.size(); i++) {
					short[] tmpBuf = buf.get(i);
					SimpleDraw(X_index, tmpBuf, rateY, baseLine);// 把缓冲区数据画出来
					X_index = X_index + tmpBuf.length;
					if (X_index > sfv.getWidth()) {
						X_index = 0;
					}
				}
			}
		}
		/**
		 * 绘制指定区域
		 * 
		 * @param start
		 *            X轴开始的位置(全屏)
		 * @param buffer
		 *            缓冲区
		 * @param rate
		 *            Y轴数据缩小的比例
		 * @param baseLine
		 *            Y轴基线
		 */
		void SimpleDraw(int start, short[] buffer, int rate, int baseLine) {
			if (start == 0)
				oldX = 0;
			Canvas canvas = sfv.getHolder().lockCanvas(
					new Rect(start, 0, start + buffer.length, sfv.getHeight()));// 关键:获取画布
			canvas.drawColor(Color.BLACK);// 清除背景
			int y;
			for (int i = 0; i < buffer.length; i++) {// 有多少画多少
				int x = i + start;
				y = buffer[i] / rate + baseLine;// 调节缩小比例，调节基准线
				canvas.drawLine(oldX, oldY, x, y, mPaint);
				oldX = x;
				oldY = y;
			}
			sfv.getHolder().unlockCanvasAndPost(canvas);// 解锁画布，提交画好的图像
		}
	}

}

画图类：package com.android.record;

import java.util.ArrayList;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.media.AudioRecord;
import android.view.SurfaceView;
public class Draw {
	public ArrayList<short[]> inBuf = new ArrayList<short[]>();
	private boolean isRecording = false;// 线程控制标记
	/**
	 * X轴缩小的比例
	 */
	public int rateX = 4;
	/**
	 * Y轴缩小的比例
	 */
	public int rateY = 4;
	/**
	 * Y轴基线
	 */
	public int baseLine = 0;
	/**
	 * 初始化
	 */
	public void init(int rateX, int rateY, int baseLine) {
		this.rateX = rateX;
		this.rateY = rateY;
		this.baseLine = baseLine;
	}
	/**
	 * 开始
	 * 
	 * @param recBufSize
	 *            AudioRecord的MinBufferSize
	 */
	public void Start(AudioRecord audioRecord, int recBufSize, SurfaceView sfv,
			Paint mPaint) {
		isRecording = true;
//		new RecordThread(audioRecord, recBufSize).start();// 开始绘制线程
		new DrawThread(sfv, mPaint).start();// 开始绘制线程
	}
	/**
	 * 停止
	 */
	public void Stop() {
		isRecording = false;
		inBuf.clear();// 清除
	}
	/**
	 * 负责从MIC保存数据到inBuf
	 * 
	 * @author GV
	 * 
	 */
	class RecordThread extends Thread {
		private int recBufSize;
		private AudioRecord audioRecord;
		public RecordThread(AudioRecord audioRecord, int recBufSize) {
			this.audioRecord = audioRecord;
			this.recBufSize = recBufSize;
		}
		public void run() {
			try {
				short[] buffer = new short[recBufSize];
				while (isRecording) {
					// 从MIC保存数据到缓冲区
					int bufferReadResult = audioRecord.read(buffer, 0,
							recBufSize);
					short[] tmpBuf = new short[bufferReadResult / rateX];
					for (int i = 0, ii = 0; i < tmpBuf.length; i++, ii = i
							* rateX) {
						tmpBuf[i] = buffer[ii];
					}
					synchronized (inBuf) {//
						inBuf.add(tmpBuf);// 添加数据
					}
				}
			} catch (Throwable t) {
			}
		}
	};
	/**
	 * 负责绘制inBuf中的数据
	 * 
	 * @author GV
	 * 
	 */
	class DrawThread extends Thread {
		private int oldX = 0;// 上次绘制的X坐标
		private int oldY = 0;// 上次绘制的Y坐标
		private SurfaceView sfv;// 画板
		private int X_index = 0;// 当前画图所在屏幕X轴的坐标
		private Paint mPaint;// 画笔
		public DrawThread(SurfaceView sfv, Paint mPaint) {
			this.sfv = sfv;
			this.mPaint = mPaint;
		}
		public void run() {
			while (isRecording) {
				ArrayList<short[]> buf = new ArrayList<short[]>();
				synchronized (inBuf) {
					if (inBuf.size() == 0)
						continue;
					buf = (ArrayList<short[]>) inBuf.clone();// 保存
					inBuf.clear();// 清除
				}
				for (int i = 0; i < buf.size(); i++) {
					short[] tmpBuf = buf.get(i);
					SimpleDraw(X_index, tmpBuf, rateY, baseLine);// 把缓冲区数据画出来
					X_index = X_index + tmpBuf.length;
					if (X_index > sfv.getWidth()) {
						X_index = 0;
					}
				}
			}
		}
		/**
		 * 绘制指定区域
		 * 
		 * @param start
		 *            X轴开始的位置(全屏)
		 * @param buffer
		 *            缓冲区
		 * @param rate
		 *            Y轴数据缩小的比例
		 * @param baseLine
		 *            Y轴基线
		 */
		void SimpleDraw(int start, short[] buffer, int rate, int baseLine) {
			if (start == 0)
				oldX = 0;
			Canvas canvas = sfv.getHolder().lockCanvas(
					new Rect(start, 0, start + buffer.length, sfv.getHeight()));// 关键:获取画布
			canvas.drawColor(Color.BLACK);// 清除背景
			int y;
			for (int i = 0; i < buffer.length; i++) {// 有多少画多少
				int x = i + start;
				y = buffer[i] / rate + baseLine;// 调节缩小比例，调节基准线
				canvas.drawLine(oldX, oldY, x, y, mPaint);
				oldX = x;
				oldY = y;
			}
			sfv.getHolder().unlockCanvasAndPost(canvas);// 解锁画布，提交画好的图像
		}
	}
}

完整的项目见附件.

关键技术点：

1.使用AudioRecord 进行录音；

2.录音写文件与现实示波同时进行；

2个线程同步，主要数据只有一份，所以得拷贝一份给2个线程用，不然的话录音会短截；

3.主要控制好字节流（转化成数字）在画布上的显示，需要多次调试才达到效果；

4.暂停与进行录音需要一个线程控制，如果按了暂停，就设置线程里面有一个开关（例如mPause），暂停了就不写字节流和显示图像，按继续才开始。结束的时候就保持文件和把图像清空；

如有不懂的童鞋欢迎与我联系。

record.zip (231.6 KB)
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2012-08-28 21:54
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