How to turn on front flash light programmatically in Android

Question

I want to turn on  front flash light  not with camera preview  programmatically in Android  I googled for it but the help i found referred me to this page   Does anyone have any links or sample code

User · Answer

In Marshmallow and above  CameraManager s  setTorchMode    seems to be the answer  This works for me    final CameraManager mCameraManager    CameraManager  getSystemService Context CAMERA SERVICE    CameraManager TorchCallback torchCallback   new CameraManager TorchCallback           Override      public void onTorchModeUnavailable String cameraId             super onTorchModeUnavailable cameraId                 Override      public void onTorchModeChanged String cameraId  boolean enabled             super onTorchModeChanged cameraId  enabled            boolean currentTorchState   enabled           try                mCameraManager setTorchMode cameraId   currentTorchState              catch  CameraAccessException e                    mCameraManager registerTorchCallback torchCallback  null    fires onTorchModeChanged upon register  mCameraManager unregisterTorchCallback torchCallback

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Complete Code for android Flashlight App  Manifest     lt  xml version  1 0  encoding  utf-8   gt     lt manifest xmlns android  http   schemas android com apk res android        package  com user flashlight        android versionCode  1        android versionName  1 0  gt          lt uses-sdk           android minSdkVersion  8            android targetSdkVersion  17   gt          lt uses-permission android name  android permission CAMERA    gt         lt uses-feature android name  android hardware camera   gt          lt application           android allowBackup  true            android icon   mipmap ic launcher            android label   string app name            android theme   style AppTheme   gt             lt activity               android name   MainActivity                android label   string app name   gt                 lt intent-filter gt                     lt action android name  android intent action MAIN    gt                      lt category android name  android intent category LAUNCHER    gt                 lt  intent-filter gt             lt  activity gt         lt  application gt      lt  manifest gt    XML   lt RelativeLayout xmlns android  http   schemas android com apk res android      xmlns tools  http   schemas android com tools  android layout width  match parent      android layout height  match parent  android paddingLeft   dimen activity horizontal margin      android paddingRight   dimen activity horizontal margin      android paddingTop   dimen activity vertical margin      android paddingBottom   dimen activity vertical margin  tools context   MainActivity  gt        lt Button         android layout width  wrap content          android layout height  wrap content          android text  OFF          android id    id button          android layout centerVertical  true          android layout centerHorizontal  true          android onClick  turnFlashOnOrOff    gt   lt  RelativeLayout gt    MainActivity java    import android app AlertDialog    import android content DialogInterface    import android content pm PackageManager    import android hardware Camera    import android hardware Camera Parameters    import android support v7 app AppCompatActivity    import android os Bundle    import android view View    import android widget Button     import java security Policy     public class MainActivity extends AppCompatActivity          Button button        private Camera camera        private boolean isFlashOn        private boolean hasFlash        Parameters params          Override       protected void onCreate Bundle savedInstanceState              super onCreate savedInstanceState             setContentView R layout activity main              button    Button  findViewById R id button              hasFlash   getApplicationContext   getPackageManager   hasSystemFeature PackageManager FEATURE CAMERA FLASH              if  hasFlash                   AlertDialog alert   new AlertDialog Builder MainActivity this  create                  alert setTitle  Error                  alert setMessage  Sorry  your device doesn t support flash light                   alert setButton  OK   new DialogInterface OnClickListener                        Override                   public void onClick DialogInterface dialog  int which                          finish                                                        alert show                  return                         getCamera               button setOnClickListener new View OnClickListener                    Override               public void onClick View v                       if  isFlashOn                          turnOffFlash                          button setText  ON                        else                         turnOnFlash                          button setText  OFF                                                                      private void getCamera                if  camera    null                  try                     camera   Camera open                      params   camera getParameters                   catch  Exception e                                                 private void turnOnFlash                if  isFlashOn                  if camera    null    params    null                      return                                 params   camera getParameters                  params setFlashMode Parameters FLASH MODE TORCH                 camera setParameters params                 camera startPreview                  isFlashOn   true                              private void turnOffFlash                    if  isFlashOn                      if  camera    null    params    null                          return                                         params   camera getParameters                      params setFlashMode Parameters FLASH MODE OFF                     camera setParameters params                     camera stopPreview                      isFlashOn   false                                  Override       protected void onDestroy               super onDestroy                    Override       protected void onPause               super onPause                  on pause turn off the flash           turnOffFlash                    Override       protected void onRestart               super onRestart                    Override       protected void onResume               super onResume                  on resume turn on the flash           if hasFlash                turnOnFlash                    Override       protected void onStart               super onStart                  on starting the app get the camera params           getCamera                    Override       protected void onStop               super onStop                  on stop release the camera           if  camera    null                  camera release                  camera   null

User · Answer

From my experience  if your application is designed to work in both portrait and landscape orientation  you need to declare the variable cam as static  Otherwise  onDestroy    which is called on switching orientation  destroys it but doesn t release Camera so it s not possible to reopen it again   package com example flashlight   import android hardware Camera  import android hardware Camera Parameters  import android os Bundle  import android app Activity  import android content pm PackageManager  import android view Menu  import android view View  import android widget Toast   public class MainActivity extends Activity    public static Camera cam   null    has to be static  otherwise onDestroy   destroys it   Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main       Override public boolean onCreateOptionsMenu Menu menu           Inflate the menu  this adds items to the action bar if it is present      getMenuInflater   inflate R menu activity main  menu       return true     public void flashLightOn View view         try           if  getPackageManager   hasSystemFeature                  PackageManager FEATURE CAMERA FLASH                 cam   Camera open                Parameters p   cam getParameters                p setFlashMode Parameters FLASH MODE TORCH               cam setParameters p               cam startPreview                    catch  Exception e            e printStackTrace            Toast makeText getBaseContext     Exception flashLightOn                     Toast LENGTH SHORT  show             public void flashLightOff View view        try           if  getPackageManager   hasSystemFeature                  PackageManager FEATURE CAMERA FLASH                 cam stopPreview                cam release                cam   null                  catch  Exception e            e printStackTrace            Toast makeText getBaseContext     Exception flashLightOff                   Toast LENGTH SHORT  show                to manifest I had to put this line       lt uses-permission android name  android permission CAMERA    gt    from http   developer android com reference android hardware Camera html  suggested lines above wasn t working for me

User · Answer

I have implemented this function in my application through fragments using SurfaceView  The link to this stackoverflow question and its answer can be found here  Hope this helps

User · Answer

Android Lollipop introduced camera2 API and deprecated the previous camera API  However  using the deprecated API to turn on the flash still works and is much simpler than using the new API   It seems that the new API is intended for use in dedicated full featured camera apps and that its architects didn t really consider simpler use cases such as turning on the flashlight  To do that now  one has to get a CameraManager  create a CaptureSession with a dummy Surface  and finally create and start a CaptureRequest  Exception handling  resource cleanup and long callbacks included   To see how to turn the flashlight on Lollipop and newer  take a look at the FlashlightController in the AOSP project  try to find the newest as older use APIs that have been modified   Don t forget to set the needed permissions     Android Marshmallow finally introduced a simple way to turn on the flash with setTorchMode

User · Answer

Try this       CameraManager camManager    CameraManager  getSystemService Context CAMERA SERVICE       String cameraId   null     Usually front camera is at 0 position      try           cameraId   camManager getCameraIdList   0           camManager setTorchMode cameraId  true         catch  CameraAccessException e            e printStackTrace

User · Answer

In API 23 or Higher  Android M  6 0      Turn On code   if  Build VERSION SDK INT  gt   Build VERSION CODES M        CameraManager camManager    CameraManager  getSystemService Context CAMERA SERVICE       String cameraId   null       try           cameraId   camManager getCameraIdList   0           camManager setTorchMode cameraId  true       Turn ON       catch  CameraAccessException e            e printStackTrace                 Turn OFF code    camManager setTorchMode cameraId  false        And Permissions    lt uses-permission android name  android permission CAMERA   gt   lt uses-permission android name  android permission FLASHLIGHT   gt    ADDITIONAL EDIT  People still upvoting my answer so I decided to post additional code This was my solution for the problem back in the day   public class FlashlightProvider    private static final String TAG   FlashlightProvider class getSimpleName    private Camera mCamera  private Camera Parameters parameters  private CameraManager camManager  private Context context   public FlashlightProvider Context context        this context   context     private void turnFlashlightOn         if  Build VERSION SDK INT  gt   Build VERSION CODES M            try               camManager    CameraManager  context getSystemService Context CAMERA SERVICE               String cameraId   null               if  camManager    null                    cameraId   camManager getCameraIdList   0                   camManager setTorchMode cameraId  true                           catch  CameraAccessException e                Log e TAG  e toString                     else           mCamera   Camera open            parameters   mCamera getParameters            parameters setFlashMode Camera Parameters FLASH MODE TORCH           mCamera setParameters parameters           mCamera startPreview             private void turnFlashlightOff         if  Build VERSION SDK INT  gt   Build VERSION CODES M            try               String cameraId              camManager    CameraManager  context getSystemService Context CAMERA SERVICE               if  camManager    null                    cameraId   camManager getCameraIdList   0      Usually front camera is at 0 position                  camManager setTorchMode cameraId  false                           catch  CameraAccessException e                e printStackTrace                    else           mCamera   Camera open            parameters   mCamera getParameters            parameters setFlashMode Camera Parameters FLASH MODE OFF           mCamera setParameters parameters           mCamera stopPreview

User · Answer

You can also use the following code to turn off the flash   Camera Parameters params   mCamera getParameters   p setFlashMode Parameters FLASH MODE OFF   mCamera setParameters params

User · Answer

There s different ways to access Camera Flash in different Android versions  Few APIs stopped working in Lollipop and then it got changed again in Marshmallow  To overcome this  I have created a simple library that I have been using in few of my projects and it s giving good results  It s still incomplete  but you can try to check the code and find the missing pieces  Here s the link - NoobCameraFlash   If you just want to integrate in your code  you can use gradle for that  Here s the instructions  Taken directly from the Readme  -   Step 1  Add the JitPack repository to your build file  Add it in your root build gradle at the end of repositories   allprojects           repositories                               maven   url  https   jitpack io                  Step 2  Add the dependency  dependencies           compile  com github Abhi347 NoobCameraFlash 0 0 1        Usage  Initialize the NoobCameraManager singleton   NoobCameraManager getInstance   init this     You can optionally set the Log Level for debug logging  Logging uses LumberJack library  The default LogLevel is LogLevel None  NoobCameraManager getInstance   init this  LogLevel Verbose     After that you just need to call the singleton to turn on or off the camera flash   NoobCameraManager getInstance   turnOnFlash    NoobCameraManager getInstance   turnOffFlash         You have to take care of the runtime permissions to access Camera   yourself  before initializing the NoobCameraManager  In version 0 1 2   or earlier we used to provide support for permissions directly from   the library  but due to dependency on the Activity object  we have to   remove it    It s easy to toggle Flash too  if NoobCameraManager getInstance   isFlashOn         NoobCameraManager getInstance   turnOffFlash     else      NoobCameraManager getInstance   turnOnFlash

User · Answer

I Got AutoFlash light with below simple Three Steps    I just added Camera and Flash Permission in Manifest xml file     lt uses-permission android name  android permission CAMERA    gt   lt uses-feature android name  android hardware camera    gt    lt uses-permission android name  android permission FLASHLIGHT   gt   lt uses-feature android name  android hardware camera flash  android required  false    gt      In your Camera Code do this way     Open Camera Camera  mCamera   Camera open        Get Camera Params for customisation Camera Parameters parameters   mCamera getParameters       Check Whether device supports AutoFlash  If you YES then set AutoFlash List lt String gt  flashModes   parameters getSupportedFlashModes    if  flashModes contains android hardware Camera Parameters FLASH MODE AUTO          parameters setFlashMode Parameters FLASH MODE AUTO     mCamera setParameters parameters   mCamera startPreview     Build   Run      Now Go to Dim light area and Snap photo  you should get auto flash light if device supports

User · Answer

For this problem you should    Check whether the flashlight is available or not  If so then Turn Off On If not then you can do whatever  according to your app needs    For Checking availability of flash in the device    You can use the following    context getPackageManager   hasSystemFeature PackageManager FEATURE CAMERA FLASH     which will return true if a flash is available  false if not   See http   developer android com reference android content pm PackageManager html for more information   For turning on off flashlight   I googled out and got this about android permission FLASHLIGHT  Android manifests  permission looks promising     lt  -- Allows access to the flashlight -- gt    lt permission android name  android permission FLASHLIGHT               android permissionGroup  android permission-group HARDWARE CONTROLS               android protectionLevel  normal               android label   string permlab flashlight               android description   string permdesc flashlight    gt    Then make use of Camera and set Camera Parameters  The main parameter used here is FLASH MODE TORCH    eg   Code Snippet to turn on camera flashlight    Camera cam   Camera open         Parameters p   cam getParameters    p setFlashMode Parameters FLASH MODE TORCH   cam setParameters p   cam startPreview      Code snippet to turn off camera led light      cam stopPreview      cam release      I just found a project that uses this permission  Check quick-settings  src code  here http   code google com p quick-settings   Note  This link is now broken   For Flashlight directly look  http   code google com p quick-settings source browse trunk quick-settings  quick-settings src com bwx bequick flashlight  Note  This link is now broken   Update6 You could also try to add a SurfaceView as described in this answer LED flashlight on Galaxy Nexus controllable by what API  This seems to be a solution that works on many phones   Update 5 Major Update  I have found an alternative Link  for the broken links above   http   www java2s com Open-Source Android Tools quick-settings com bwx bequick flashlight htm You can now use this link   Update  14 9 2012 This link is now broken   Update 1  Another OpenSource Code    http   code google com p torch source browse   Update 2  Example showing how to enable the LED on a Motorola Droid  http   code google com p droidled   Another Open Source Code     http   code google com p covedesigndev    http   code google com p search-light   Update 3  Widget for turning on off camera led   If you want to develop a widget that turns on off your camera led  then you must refer my answer  Widget for turning on off camera flashlight in android    Update 4  If you want to set the intensity of light emerging from camera LED you can refer Can I change the LED intensity of an Android device  full post  Note that only rooted HTC devices support this feature      Issues     There are also some problems while turning On Off flashlight  eg  for the devices not having FLASH MODE TORCH or even if it has  then flashlight does not turn ON etc   Typically Samsung creates a lot of problems    You can refer to problems in the given below list    Use camera flashlight in Android  Turn ON OFF Camera LED flash light in Samsung Galaxy Ace 2 2 1  amp  Galaxy Tab

[android] How to turn on front flash light programmatically in Android?

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