首先，看看核心Activity：

import?android.app.Activity;

import?android.media.AudioFormat;

import?android.media.AudioRecord;

import?android.media.MediaRecorder;

import?android.os.Bundle;

import?android.os.Handler;

import?android.os.Looper;

import?android.os.Message;

import?android.view.Menu;

import?android.widget.TextView;

public?class?MainActivity?extends?Activity?{

private?TextView?text;

private?AudioRecord?ar;

private?int?bs;

private?static?final?int?SAMPLE_RATE_IN_HZ?=?44100;

public?boolean?isRun?=?false;

private?Handler?handler?=?new?Handler(){

@Override

public?void?handleMessage(Message?msg)?{

super.handleMessage(msg);

switch(msg.what){

case?1:

text.setText(msg.obj.toString());

break;

default:

break;

}

}

};;

@Override

public?void?onCreate(Bundle?savedInstanceState)?{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

text?=?(TextView)?findViewById(R.id.text);

MainThread?mt?=?new?MainThread();

mt.start();

}

class?MainThread?extends?Thread?{

public?void?run()?{

Looper.prepare();

bs?=?AudioRecord.getMinBufferSize(SAMPLE_RATE_IN_HZ,

AudioFormat.CHANNEL_CONFIGURATION_MONO,

AudioFormat.ENCODING_PCM_16BIT);

ar?=?new?AudioRecord(MediaRecorder.AudioSource.MIC,

SAMPLE_RATE_IN_HZ,?AudioFormat.CHANNEL_CONFIGURATION_MONO,

AudioFormat.ENCODING_PCM_16BIT,?bs);

ar.startRecording();

isRun?=?true;

while?(isRun)?{

short[]?buffer?=?new?short[bs];

int?r=ar.read(buffer,?0,?bs);

int?v?=?0;

for?(int?i?=?0;?i?

v?+=?buffer[i]*buffer[i];

}

Message?msg?=?new?Message();

msg.what?=?1;

msg.obj?=?(int)Math.round(10*Math.log10(v/r));//單位是dB

handler.sendMessage(msg);

try?{

Thread.sleep(500);

}?catch?(InterruptedException?e)?{

e.printStackTrace();

}

}

ar.stop();

Looper.loop();

}

}

@Override

public?void?onBackPressed()?{

super.onBackPressed();

isRun?=?false;

ar.release();

System.exit(0);

}

@Override

public?boolean?onCreateOptionsMenu(Menu?menu)?{

getMenuInflater().inflate(R.menu.main,?menu);

return?true;

}

}

AndroidManifest.xml

http://schemas.android.com/apk/res/android"

package="*****此處隱私******"

android:versionCode="1"

android:versionName="1.0"?>

android:minSdkVersion="8"

android:targetSdkVersion="15"?/>

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme"?>

android:name=".MainActivity"

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

android:label="@string/title_activity_main"?>

其他布局文件自己定義即可。

此處關(guān)鍵在于對(duì)獲取的樣本數(shù)據(jù)進(jìn)行分析。

總結(jié)

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