android获取音量分贝值

概述android获取音量分贝值AudioRecordDemo.java packagecom.example.recording;importandroid.media.AudioFormat;importandroid.media.AudioRecord;importandroid.media.MediaRecorder;importandroid.util.Log;publicclassAudioRecordDemo{ privatestatic androID获取音量分贝值

AudioRecordDemo.java

 

package com.example.recording;import androID.media.AudioFormat;import androID.media.AudioRecord;import androID.media.MediaRecorder;import androID.util.Log;public class AudioRecordDemo {	private static final String TAG = "AudioRecord";  	static final int SAMPLE_RATE_IN_HZ = 8000;  	static final int BUFFER_SIZE = AudioRecord.getMinBufferSize(SAMPLE_RATE_IN_HZ,  			AudioFormat.CHANNEL_IN_DEFAulT, AudioFormat.ENCoding_PCM_16BIT);  	AudioRecord mAudioRecord;  	boolean isGetVoiceRun;  	Object mlock;  	public AudioRecordDemo() {  		mlock = new Object();  	}  	public voID getNoiseLevel() {  		if (isGetVoiceRun) {  			Log.e(TAG, "还在录着呢");  			return;  		}  		mAudioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,  				SAMPLE_RATE_IN_HZ, AudioFormat.CHANNEL_IN_DEFAulT,  				AudioFormat.ENCoding_PCM_16BIT, BUFFER_SIZE);  		if (mAudioRecord == null) {  			Log.e("sound", "mAudioRecord初始化失败");  		}  		isGetVoiceRun = true;  		new Thread(new Runnable() {  			@OverrIDe  			public voID run() {  				mAudioRecord.startRecording();  				short[] buffer = new short[BUFFER_SIZE];  				while (isGetVoiceRun) {  					//r是实际读取的数据长度，一般而言r会小于buffersize  					int r = mAudioRecord.read(buffer, 0, BUFFER_SIZE);  					long v = 0;  					// 将 buffer 内容取出，进行平方和运算  					for (int i = 0; i < buffer.length; i++) {  						v += buffer[i] * buffer[i];  					}  					// 平方和除以数据总长度，得到音量大小。  					double mean = v / (double) r;  					double volume = 10 * Math.log10(mean);  					Log.d(TAG, "分贝值:" + volume); 					if(volume>80){						Log.d(TAG, "恭喜您获得一元优惠券");  						}				 					// 大概一秒十次  					synchronized (mlock) {  						try {  							mlock.wait(100);  												} catch (InterruptedException e) {  							e.printstacktrace();  						}  					}  				}  				mAudioRecord.stop();  				mAudioRecord.release();  				mAudioRecord = null;  			}  		}).start();  	}  }

 

MediaRecorderDemo.java

 

package com.example.recording;import java.io.file;import java.io.IOException;import androID.media.MediaRecorder;import androID.os.Handler;import androID.util.Log;public class MediaRecorderDemo {	private final String TAG = "MediaRecord";  	private MediaRecorder mMediaRecorder;  	public static final int MAX_LENGTH = 1000 * 60 * 10;// 最大录音时长1000*60*10;  	private String filePath;  	public MediaRecorderDemo(){  		this.filePath = "/dev/null";  	}  	public MediaRecorderDemo(file file) {  		this.filePath = file.getabsolutePath();  	}  	private long startTime;  	private long endTime;  	/** 	 * 开始录音 使用amr格式 	 * 	 *            录音文件 	 * @return 	 */  	public voID startRecord() {  		// 开始录音  		/* ①Initial：实例化MediaRecorder对象 */  		if (mMediaRecorder == null)  			mMediaRecorder = new MediaRecorder();  		try {  			/* ②setAudioSource/setVedioSource */  			mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);// 设置麦克风  			/* ②设置音频文件的编码：AAC/AMR_NB/AMR_MB/Default 声音的（波形）的采样 */  			mMediaRecorder.setoutputFormat(MediaRecorder.OutputFormat.DEFAulT);  			/* 			 * ②设置输出文件的格式：THREE_GPP/MPEG-4/RAW_AMR/Default THREE_GPP(3gp格式 			 * ，H263视频/ARM音频编码)、MPEG-4、RAW_AMR(只支持音频且音频编码要求为AMR_NB) 			 */  			mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);  			/* ③准备 */  			mMediaRecorder.setoutputfile(filePath);  			mMediaRecorder.setMaxDuration(MAX_LENGTH);  			mMediaRecorder.prepare();  			/* ④开始 */  			mMediaRecorder.start();  			// AudioRecord audioRecord.  			/* 获取开始时间* */  			startTime = System.currentTimeMillis();  			updateMicStatus();  			Log.i("ACTION_START", "startTime" + startTime);  		} catch (IllegalStateException e) {  			Log.i(TAG,  					"call startAmr(file mRecAudiofile) Failed!"  							+ e.getMessage());  		} catch (IOException e) {  			Log.i(TAG,  					"call startAmr(file mRecAudiofile) Failed!"  							+ e.getMessage());  		}  	}  	/** 	 * 停止录音 	 * 	 */  	public long stopRecord() {  		if (mMediaRecorder == null)  			return 0L;  		endTime = System.currentTimeMillis();  		Log.i("ACTION_END", "endTime" + endTime);  		mMediaRecorder.stop();  		mMediaRecorder.reset();  		mMediaRecorder.release();  		mMediaRecorder = null;  		Log.i("ACTION_LENGTH", "Time" + (endTime - startTime));  		return endTime - startTime;  	}  	private final Handler mHandler = new Handler();  	private Runnable mUpdateMicStatusTimer = new Runnable() {  		public voID run() {  			updateMicStatus();  		}  	};  	/** 	 * 更新话筒状态 	 * 	 */  	private int BASE = 1;  	private int SPACE = 100;// 间隔取样时间  	private voID updateMicStatus() {  		if (mMediaRecorder != null) {  			double ratio = (double)mMediaRecorder.getMaxAmplitude() /BASE;  			double db = 0;// 分贝  			if (ratio > 1)  				db = 20 * Math.log10(ratio);  			Log.d(TAG,"分贝值："+db);  			mHandler.postDelayed(mUpdateMicStatusTimer, SPACE);  		}  	}  }

MainActivity.java

 

 

package com.example.recording;import androID.os.Bundle;import androID.app.Activity;import androID.vIEw.Menu;public class MainActivity extends Activity {	@OverrIDe	protected voID onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentVIEw(R.layout.activity_main);		new AudioRecordDemo().getNoiseLevel();			}}

activity_main.xml

 

 

<relativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"    androID:paddingleft="@dimen/activity_horizontal_margin"    androID:paddingRight="@dimen/activity_horizontal_margin"    androID:paddingtop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <TextVIEw        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:text="@string/hello_world" /></relativeLayout>

最后别忘了，在AndroIDManifest.xml中配置

 

  <uses-permission androID:name="androID.permission.RECORD_AUdio" />     

 

 

 

 

 

 

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