android audio capture example _ examples java code geeks

7/5/2015 AndroidAudioCaptureExample|ExamplesJavaCodeGeeks

http://examples.javacodegeeks.com/android/core/media/mediarecorder/androidaudiocaptureexample/ 1/13

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ABOUT KATERINA ZAMANIKaterinahasgraduatedfromtheDepartmentofInformaticsandTelecommunicationsinNationalandKapodistrianUniversityofAthens(NKUA)andsheattendsMSccoursesinAdvancedInformationSystemsatthesamedepartment.Currently,hermainacademicinterestsfocusonwebapplications,mobiledevelopment,softwareengineering,databasesandtelecommunications.

Android Audio Capture Example Postedby:KaterinaZamani inMediaRecorder January3rd,2014

Androiddevicesareequippedwithhardwareinputdevicessuchasmicrophone,cameraetc,fromwhichwecancaptureaudioorvideoinourapplications.ThemostcommonclassthatisusedisMediaRecorder

,whichrecordsaudioandvideo.

Inthisexample,wearegoingtocaptureaudiofromthedevicesmicrophone,storeittothedeviceandthenplayitbackand/orstopplayingit.

Forthistutorial,wewillusethefollowingtoolsinaWindows64bitplatform:

1. JDK1.7

2. Eclipse4.2Juno

3. AndroidSDK4.4

1.CreateaNewAndroidApplicationProjectOpenEclipseIDEandgotoFileNewProjectAndroidApplicationProject.

Specifythenameoftheapplication,theprojectandthepackage.Also,set10APIorlargerastheminimumRequiredSDK,inordertosupporttheclasseswearegoingtouse.ThenpressNextbutton.

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Inthenextwindow,theCreateActivityoptionshouldbechecked.Thenewcreatedactivitywillbethemainactivityofyourproject.ThenclickNext.

InConfigureLauncherIconwindowyoushouldchoosetheiconyouwanttohaveinyourapp.Wewillusethedefaulticonofandroid,soclickNext.

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SelecttheBlankActivityoptionandpressNext.

YouhavetospecifyanameforthenewActivityandanameforthelayoutdescriptionofyourapp.The.xmlfileforthelayoutwillautomaticallybecreatedintheres/layout

folder.Finally,pressFinish.

jobsby



Youcanseethefinalstructureofthecreatedprojectintheimagebelow.

2.CreatethelayoutoftheMainActivityInthisapplication,wewanttostartandstoprecording,aswellasstartandstopplayingtherecordingsound.ForthisreasonwearegoingtoaddfourdifferentButtons

inthelayout,whereeachoneenablestheappropriatefunctionality.Also,aTextView

willbeusedtoshowusthecurrentsituation.



Openres/layout/activity_main.xml

gotothexmltabandpastethefollowing.

activity_main.xml:

NoticethatweaddedanImageView

whereitscontentisapictureofaudiorecording,thatAndroidprovideusthroughthedrawable.

3.CodetheMainActivityForaudiorecord,weshouldcreateaninstanceofMediaRecorder

classandsetsomeinformationaboutthesourceandtheoutputfile.WeuseMediaRecorder.AudioSource.MIC

inordertosetthemicrophoneofthedeviceastheaudiosource.Inaddition,wehavetosettheformatandthenameoftheoutputfile,as

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wellastheaudioencoderfortheoutputfileinordertocontainanaudiotrack.Noticethatinourexample,wealsosetthepaththattheoutputfilewillbelocated.

Beforestartingtherecordingisveryimportanttopreparecapturingandencodingdata.Forthisreason,prepare()

andstart()

methodsarecalled.Itisimportanttomentionthatprepare()

methodmustbecalledbeforestart()

method,butafterthesettingofsource,formatandencodinginformation.Incontrast,tostopsoundrecordingstop()

methodshouldbecalled.Afterthat,iftheinstanceofMediaRecorder

isnotusedanymore,itisrecommendedtofreetheresource,bycallingrelease()

method.Ifyounoticeinthecodebelow,appropriateExceptions

arecalledforthespecificmethods.

Inourexample,wewanttoplaybackthesoundwejustrecorded,sowecreateaninstanceofMediaPlayer

class.Afterspecifyingthesourcefilethatwewanttouse,prepare()

andstart()

methodsarecalledinordertostartplayingtheaudiotrack.Respectively,stop()

andrelease()

methodsarecalledtostoptheplaybackandtofreetheMediaPlayer

objectresources.

Opensrc/com.javacodegeeks.android.audiocapturetest/MaainActivity.java

fileandpastethecodebelow.

MainActivity.java:

001 packagecom.javacodegeeks.android.audiocapturetest;002 003 importjava.io.IOException;004 importandroid.media.MediaPlayer;005 importandroid.media.MediaRecorder;006 importandroid.os.Bundle;007 importandroid.os.Environment;008 importandroid.app.Activity;009 importandroid.view.View;010 importandroid.view.View.OnClickListener;011 importandroid.widget.Button;012 importandroid.widget.TextView;013 importandroid.widget.Toast;014 015 publicclassMainActivityextendsActivity{016 017 privateMediaRecordermyRecorder;018 privateMediaPlayermyPlayer;019 privateStringoutputFile=null;



020 privateButtonstartBtn;021 privateButtonstopBtn;022 privateButtonplayBtn;023 privateButtonstopPlayBtn;024 privateTextViewtext;025 026 @Override027 protectedvoidonCreate(BundlesavedInstanceState){028 super.onCreate(savedInstanceState);029 setContentView(R.layout.activity_main);030 031 text=(TextView)findViewById(R.id.text1);032 //storeittosdcard033 outputFile=Environment.getExternalStorageDirectory().034 getAbsolutePath()+"/javacodegeeksRecording.3gpp";035 036 myRecorder=newMediaRecorder();037 myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);038 myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);039 myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);040 myRecorder.setOutputFile(outputFile);041 042 startBtn=(Button)findViewById(R.id.start);043 startBtn.setOnClickListener(newOnClickListener(){044 045 @Override046 publicvoidonClick(Viewv){047 //TODOAutogeneratedmethodstub048 start(v);049 }050 });051 052 stopBtn=(Button)findViewById(R.id.stop);053 stopBtn.setOnClickListener(newOnClickListener(){054 055 @Override056 publicvoidonClick(Viewv){057 //TODOAutogeneratedmethodstub058 stop(v);059 }060 });061 062 playBtn=(Button)findViewById(R.id.play);063 playBtn.setOnClickListener(newOnClickListener(){064 065 @Override066 publicvoidonClick(Viewv){067 //TODOAutogeneratedmethodstub068 play(v);069 }070 });071 072 stopPlayBtn=(Button)findViewById(R.id.stopPlay);073 stopPlayBtn.setOnClickListener(newOnClickListener(){074 075 @Override076 publicvoidonClick(Viewv){077 //TODOAutogeneratedmethodstub078 stopPlay(v);079 }080 });081 }082 083 publicvoidstart(Viewview){084 try{085 myRecorder.prepare();086 myRecorder.start();087 }catch(IllegalStateExceptione){088 //start:itiscalledbeforeprepare()089 //prepare:itiscalledafterstart()orbeforesetOutputFormat()090 e.printStackTrace();091 }catch(IOExceptione){092 //prepare()fails093 e.printStackTrace();094 }095 096 text.setText("RecordingPoint:Recording");097 startBtn.setEnabled(false);098 stopBtn.setEnabled(true);099 100 Toast.makeText(getApplicationContext(),"Startrecording...",101 Toast.LENGTH_SHORT).show();102 }103 104 publicvoidstop(Viewview){105 try{106 myRecorder.stop();107 myRecorder.release();108 myRecorder=null;109 110 stopBtn.setEnabled(false);111 playBtn.setEnabled(true);112 text.setText("RecordingPoint:Stoprecording");113 114 Toast.makeText(getApplicationContext(),"Stoprecording...",115 Toast.LENGTH_SHORT).show();116 }catch(IllegalStateExceptione){117 //itiscalledbeforestart()118 e.printStackTrace();119 }catch(RuntimeExceptione){120 //novalidaudio/videodatahasbeenreceived121 e.printStackTrace();122 }123 }



4.SetthepermissionsWehavetodeclarethepermissionsintheAndroidManifest.xml

fileofourproject.WRITE_EXTERNAL_STORAGE

istowritetheoutputfileintotheexternalstorageofourdevice(sdcard).RECORD_AUDIO

isnecessaryforMediaRecorder

classtocaptureaudio.

OpenAndroidManifest.xml

fileandpastethefollowingcode.

AndroidManifest.xml:

124 125 publicvoidplay(Viewview){126 try{127 myPlayer=newMediaPlayer();128 myPlayer.setDataSource(outputFile);129 myPlayer.prepare();130 myPlayer.start();131 132 playBtn.setEnabled(false);133 stopPlayBtn.setEnabled(true);134 text.setText("RecordingPoint:Playing");135 136 Toast.makeText(getApplicationContext(),"Startplaytherecording...",137 Toast.LENGTH_SHORT).show();138 }catch(Exceptione){139 //TODOAutogeneratedcatchblock140 e.printStackTrace();141 }142 }143 144 publicvoidstopPlay(Viewview){145 try{146 if(myPlayer!=null){147 myPlayer.stop();148 myPlayer.release();149 myPlayer=null;150 playBtn.setEnabled(true);151 stopPlayBtn.setEnabled(false);152 text.setText("RecordingPoint:Stopplaying");153 154 Toast.makeText(getApplicationContext(),"Stopplayingtherecording...",155 Toast.LENGTH_SHORT).show();156 }157 }catch(Exceptione){158 //TODOAutogeneratedcatchblock159 e.printStackTrace();160 }161 }162 163 }

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5.RuntheapplicationInthisexample,wecantusetheandroidemulatortorunourapplication,becauseishasnttheabilitytocaptureaudio.ForthisreasonwehavetoconnectEclipsewithourAndroiddeviceandruntheapplicationthroughit.

So,connectyourAndroiddevicewithyourpcthroughUSB.DontforgettoenableUSBdebuggingoption,byfollowingSettingsApplicationsDevelopmentpath.

ThengotoEclipse,rightclickonourprojectRunasRunConfigurations.

Inthepopupwindowchoosethecurrentproject,gototheTarget

tabandchooseAlwaysprompttopickdeviceoption.ThenclickNext.

FinallychoosetherunningAndroiddeviceandpressOK,asshowninthenextpicture.

TheappwillbeloadedinyourAndroiddevice,asyoucanseeintheimagebelow.

29 30



Letspressstartbuttoninordertostartaudiorecording.Asyoucanseeinthepicturebelow,aToast

appearsandtheTextView

issettoRecording.

Nowclickstopbutton.Theaudiotrackwillautomaticallybestoredintoyourexternalcard.Noticethatstopbuttonisnotclickableanymore.



Ifyouwanttolistentotheaudioyoujustrecorded,pressplaybutton.TheTextView

willchangeagainandaToast

messagewillbeenabled.

Finally,pressstopplayingbuttonbeforetheaudiotrackends.Thismove,willstoptheaudioandwillenableplaybuttonagain,inordertolistentoitagain.



DownloadEclipseProjectThiswasanexampleofAudioCaptureinAndroid.DownloadtheEclipseProjectofthisexample:AudioCaptureTest.zip

Taggedwith: MEDIAPLAYER

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android audio capture example _ examples java code geeks

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