HB Blog 14: Use Android Sensors To Detect Noise/Sound.

How to detect noise and set a noise threshold , when this noise/sound frequency cross threshold in Android?

Refer the below link for complete sample code:-
Download Sample Code

Download Apk File

Have a look on few code snippets,

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//Define runnable thread again and again detect noise private Runnable mSleepTask = new Runnable() { public void run() { //Log.i("Noise", "runnable mSleepTask"); start(); } }; //Create runnable thread to Monitor Voice private Runnable mPollTask = new Runnable() { public void run() { double amp = mSensor.getAmplitude(); //Log.i("Noise", "runnable mPollTask"); updateDisplay("Monitoring Voice...", amp); if ((amp > mThreshold)) { callForHelp(); //Log.i("Noise", "==== onCreate ==="); } // Runnable(mPollTask) will again execute after POLL_INTERVAL mHandler.postDelayed(mPollTask, POLL_INTERVAL); } }; //onCreate @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // Defined SoundLevelView in main.xml file setContentView(R.layout.activity_main); mStatusView = (TextView) findViewById(R.id.status); // Used to record voice mSensor = new SoundMeter(); mDisplay = (SoundLevelView) findViewById(R.id.volume); PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE); mWakeLock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "NoiseAlert"); } //start Noise monitoring private void start() { mSensor.start(); if (!mWakeLock.isHeld()) { mWakeLock.acquire(); } //Noise monitoring start // Runnable(mPollTask) will execute after POLL_INTERVAL mHandler.postDelayed(mPollTask, POLL_INTERVAL); }