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Flashlight-master
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# Flashlight  [](https://nachiketavadera.github.io/Flashlight) [](https://github.com/NachiketaVadera/Flashlight) [](http://makeapullrequest.com) [](https://opensource.org/licenses/Apache-2.0) ## Summary The base of this project is LED provided along with the Camera in a typical Android smart phone. After seeing that Play Store has a number of apps that ask for unnecessary permissions, I decided to create an app that toggles the LED without asking for any type of permission. This app also implements a service that detects when the device is shook (used to toggle the flashlight). As of June 24th of 2018, Flashlight is licensed under Apache License version 2.0. ## Downloads Latest apk: [Flashlight.apk](https://github.com/NachiketaVadera/Flashlight/releases/download/v1.5/Flashlight-v1.5.apk) Source Code (zip): [Flashlight.zip](https://github.com/NachiketaVadera/Flashlight/archive/v1.5.zip) Source Code (tar.gz): [Flashlight.tar.gz](https://github.com/NachiketaVadera/Flashlight/archive/v1.5.tar.gz) ## Contributors * Code Optimization : [RamusisTrenksmas](https://github.com/RamusisTrenksmas) * Logo and Images : [Dee-y](https://github.com/dee-y) ## Code The majority of the code is written in Java and is simple. For detecting shake motion: Declare global variables: ```java SensorManager sensorManager = null; public static final float SHAKE_THRESHOLD = 10.25f; // How hard should user shake to invoke the service public static final int MIN_TIME_BETWEEN_SHAKES = 1000; private long lastShakeTime = 0; private boolean isFlashlightOn = false; ``` Initialize sensorManager: ```java sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); if (sensorManager != null) { Sensor accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); sensorManager.registerListener((SensorEventListener) this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL); } ``` Make class implement SensorEventListener interface and override it's onSensorChanged method: ```java @Override public void onSensorChanged(SensorEvent event) { if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { long curTime = System.currentTimeMillis(); if ((curTime - lastShakeTime) > MIN_TIME_BETWEEN_SHAKES) { float x = event.values[0]; float y = event.values[1]; float z = event.values[2]; double acceleration = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2)) - SensorManager.GRAVITY_EARTH; if (acceleration > SHAKE_THRESHOLD) { lastShakeTime = curTime; if (!isFlashlightOn) { torchToggle("on"); isFlashlightOn = true; } else { torchToggle("off"); isFlashlightOn = false; } } } } ``` Create a function torchToggle(String command): ```java private void torchToggle(String command) { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) { CameraManager camManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE); String cameraId = null; // Usually back camera is at 0 position. try { if (camManager != null) { cameraId = camManager.getCameraIdList()[0]; } if (camManager != null) { if (command.equals("on")) { camManager.setTorchMode(cameraId, true); // Turn ON isFlashlightOn = true; } else { camManager.setTorchMode(cameraId, false); // Turn OFF isFlashlightOn = false; } } } catch (CameraAccessException e) { e.getMessage(); } } } ``` ## Contributing Any help, including feedback, is highly appriciated. I have just started out with Android and I’m relatively new to app development. 1. Fork it! 2. Create your feature branch: `git checkout -b new-branch` 3. Commit your changes: `git commit -am 'Make a valuable addition'` 4. Push to the branch: `git push origin new-feature` 5. Submit a pull request :D ## Next Step Once staretd, an app can never be completely finished. 1. Provide users option to toggle the service ON/OFF. 2. Optimize code. 3. Make flashlight toggle easier.
