Example of audio recording processing code similar to WeChat speech

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Package com. example. testaudio; 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. OS. handler; import android. OS. message; import android. util. log; import android. view. menu; import android. view. motionEvent; import Android Oid. view. view; import android. view. view. onClickListener; import android. view. view. onTouchListener; import android. widget. button; import android. widget. textView; public class MainActivity extends Activity {private MediaRecorder recoder = null; private MediaPlayer player = null; private String theMediaPath; TextView TV = null; TextView tvRecord = null; Button testBtn = null; button testBtn2 = null; Ton stopBtn = null; Button playBtn = null; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); TV = (TextView) findViewById (R. id. textView1); tvRecord = (TextView) findViewById (R. id. tvRecord); testBtn = (Button) findViewById (R. id. button1); testBtn2 = (Button) findViewById (R. id. button2); stopBtn = (Button) findViewById (R. id. buttonStop); playBtn = (Button) findViewById (R. id. buttonPlay); testBtn2.setOnTouchListener (new OnTouchListener () {@ Override public boolean onTouch (View v, MotionEvent event) {Log. I ("testactivity", "setOnTouchListener:" + event. getAction (); switch (event. getAction () {case MotionEvent. ACTION_UP: {Log. I ("testactivity", "Stop recording"); stopRecording (); break;} case MotionEvent. ACTION_DOWN: {Log. I (" Testactivity "," start recording "); startRecording (); break;} default: break;} return false ;}); testBtn. setOnClickListener (new OnClickListener () {public void onClick (View arg0) {startRecording (); testBtn. setEnabled (false); stopBtn. setEnabled (true) ;}}); stopBtn. setEnabled (false); stopBtn. setOnClickListener (new OnClickListener () {public void onClick (View arg0) {stopRecording (); testBtn. setEnabled (tru E); playBtn. setEnabled (true); stopBtn. setEnabled (false) ;}}); playBtn. setOnClickListener (new OnClickListener () {public void onClick (View arg0) {playRecordFile (theMediaPath); stopBtn. setEnabled (true) ;}}) ;}protected void playRecordFile (String _ file) {try {File f = new File (_ file); if (! F. exists () {TV. setText ("The file does not exist:" + _ file); return ;}} catch (Exception e) {Log. I ("testactivity", e. getMessage ();} try {player = new MediaPlayer (); player. setDataSource (_ file); player. prepare (); player. setOnCompletionListener (new OnCompletionListener () {public void onCompletion (MediaPlayer arg0) {TV. setText ("playback completed"); stopBtn. setEnabled (false) ;}}); player. start ();} catch (Exception e) {Log. e ("Testactivity", "play failed:" + e. getMessage () ;}/ *** stop recording processing */protected void stopRecording () {if (recoder! = Null) {Log. I ("testactivity", "Stop recording"); recoder. stop (); recoder. release (); recoder = null; endtime = System. currentTimeMillis (); _ handleRecordComplete ();} if (player! = Null) {Log. I ("testactivity", "stop playing"); player. stop (); player. release (); player = null ;}/ *** start recording processing */protected void startRecording () {theMediaPath = Environment. getExternalStorageDirectory (). getAbsolutePath (); theMediaPath + = "/audiotest.3gp"; recoder = new MediaRecorder (); recoder. setAudioSource (MediaRecorder. audioSource. MIC); recoder. setOutputFormat (MediaRecorder. outputFormat. THREE_GPP ); Recoder. setOutputFile (theMediaPath); recoder. setAudioEncoder (MediaRecorder. audioEncoder. AMR_NB); starttime = System. currentTimeMillis (); updateMicStatus (); try {recoder. prepare (); recoder. start (); _ handleRecordStart ();} catch (Exception e) {Log. e ("testactivity", "prepared failed:" + e. getMessage (); _ handleRecordStartError (e) ;}// timer private static long maxtime = 30*1000; // 30 seconds private long Starttime = 0l; private long endtime = 0l; private final Handler mHandler = new Handler (); private Runnable mUpdateMicStatusTimer = new Runnable () {public void run () {// Determine whether the request times out if (starttime> 0 & System. currentTimeMillis ()-starttime> maxtime) {Log. e ("testactivity", "time-out recording time, directly stop"); stopRecording (); return ;}// updateMicStatus ();}}; /*** UPDATE The microphone status. the DB is the calculation formula for the relative ring decibel K = 20lg (Vo/Vi) Vo current vibration. The Vi reference value of the amplitude is 600: How do I set the reference value? When 20 ** Math. log10 (mMediaRecorder. when getmaxamplder ()/Vi) = 0, vi is the reference value I need. * when I don't talk to the microphone, I test the obtained mMediaRecorder. the getMaxAmplitude () value is the reference value. * Log. I ("mic _", "microphone reference value:" + mMediaRecorder. getmaxamplstatus (); do not say anything to the microphone if necessary */private int BASE = 600; private int SPACE = 300; // interval sampling time private void updateMicStatus () {if (recoder! = Null) {// int vuSize = 10 * mMediaRecorder. getmaxamplatio ()/32768; int ratio = recoder. getMaxAmplitude ()/BASE; int db = 0; // if (ratio> 1) db = (int) (20 * Math. log10 (ratio); _ handleRecordVoice (db); mHandler. postDelayed (mUpdateMicStatusTimer, SPACE);/** if (db> 1) {vuSize = (int) (20 * Math. log10 (db); Log. I ("mic _", * "microphone volume:" + vuSize);} else Log. I ("mic _", "microphone volume:" + 0); */} private void _ handleRecordStart () {// function TV for receiving the recording. setText ("start recording... "); // starttime start time} private void _ handleRecordStartError (Exception e) {// The receiving function for starting the Recording Fails. TV. setText ("failed to start recording:" + e. getMessage ();} private void _ handleRecordComplete () {// end the recording TV. setText ("stop recording:" + theMediaPath);} private void _ handleRecordVoice (int _ db) {// listen on sound events, convert component: Bay tvRecord. setText ("" + _ db) ;}@ Override public boolean onCreateOptionsMenu (Menu menu) {// Inflate the Menu; this adds items to the action bar if it is present. getMenuInflater (). inflate (R. menu. main, menu); return true ;}}

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