Reputation: 1329

How to turn on flashlight and front camera at the same time in android

In one of the requirement in my app I need to pop up an activity containing the front camera preview,at this same time I need to turn on the flashlight as well.However I observe that,I am able to turn on the flashlight and back camera but not front camera and flashlight together.Following is my code:

    public class Cam extends Activity {

        private static int cameraId = 0;
        private Camera camera;

        //Adding for camera preview
        public static FrameLayout preview;
        public static CameraPreview mPreview;
        Context context;

        ImageButton btnSwitch;
        private boolean isFlashOn;
        private boolean hasFlash;
        Parameters params;


        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            Log.e("Cam","Inside onCreate");
            setContentView(R.layout.cam);
            context = getApplicationContext();      

            btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);

            hasFlash = getApplicationContext().getPackageManager()
                    .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

            startCamera();

            // displaying button image
            toggleButtonImage();        

            btnSwitch.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View v) {
                    if (isFlashOn) {
                        turnOffFlash();
                    } else {
                        turnOnFlash();
                    }
                }
            });     
        }

        @Override
        protected void onPause() {
            super.onPause();

            turnOffFlash();

            Log.e("Cam","Inside onPause");
            try {
                if (camera != null) {
                    camera.release();
                    camera = null;
                    preview.removeView(mPreview);
                }

            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        protected void onResume() {
            super.onResume();

            Log.e("Cam","Inside onResume");
            try {
                if(camera ==null) {
                    Log.d("Cam","in resume,camera is  null");
                    try {
                        camera = android.hardware.Camera.open(cameraId); //opens front cam              
                        // camera = Camera.open(); when I use this I can on/off the flashlight,since I am using the back camera.
                        mPreview = new CameraPreview(this, camera);
                        preview = (FrameLayout) findViewById(R.id.camera_preview);
                        preview.addView(mPreview);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        @Override
        protected void onDestroy() {
            super.onDestroy();
            Log.e("Cam","Inside onDestroy");
            if (camera != null) {
                try {
                    camera.release();
                    camera = null;
                    preview.removeView(mPreview);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

        private void startCamera() {

                    Log.e("Cam","Inside doInBackground");
                    String msg = "";
                    // Do we have a camera?
                    try {
                        if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {

                        } else {
                            cameraId = AppFunctions.findFrontFacingCamera();//A function that returns 0 for front camera
                            if (cameraId < 0) {

                            } else {

                                try {
                                    camera = Camera.open(cameraId);//opens front cam 
                                    // camera = Camera.open(); when I use this I can on/off the flashlight,since I am calling the back camera.
                                    params = camera.getParameters(); 
                                    Log.e("Cam","camera id" + cameraId);
                                    Log.e("Cam","params" + params);
                                } catch (Exception e) {
                                    e.printStackTrace();
                                }

                                try {
                                    mPreview = new CameraPreview(getApplicationContext(), camera);
                                    preview = (FrameLayout) findViewById(R.id.camera_preview);
                                    preview.addView(mPreview);
                                } catch (Exception e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    } catch (Exception e3) {
                        e3.printStackTrace();
                    }
        }

        private void turnOnFlash() {
            Log.v("Cam","Inside turnOnFlash");
            if (!isFlashOn) {
                if (camera == null || params == null) {
                    Log.v("Cam","camera or param is null");
                    return;
                }

                params.setFlashMode(Parameters.FLASH_MODE_TORCH);
                camera.setParameters(params);
                camera.startPreview();
                isFlashOn = true;

                // changing button/switch image
                toggleButtonImage();
            }

        }

        /*
         * Turning Off flash
         */
        private void turnOffFlash() {
            Log.v("Cam","Inside turnOffFlash");
            if (isFlashOn) {
                if (camera == null || params == null) {
                    Log.v("Cam","camera or param is null");
                    return;
                }
                params.setFlashMode(Parameters.FLASH_MODE_OFF);
                camera.setParameters(params);
                camera.stopPreview();
                isFlashOn = false;

                // changing button/switch image
                toggleButtonImage();
            }
        }

        private void toggleButtonImage(){
            if(isFlashOn){
                btnSwitch.setImageResource(R.drawable.btn_switch_on);
            }else{
                btnSwitch.setImageResource(R.drawable.btn_switch_off);
            }
        }
    }

Manifest

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.front" />
<permission android:name="android.permission.FLASHLIGHT" />

How can I turn on the flashlight and front cam simultaneously? Any help would be appreciated !

Upvotes: 5

Answers (3)

Machan Max

Reputation: 89

Flashlight

 public void onToggleClicked(View view) {
    PackageManager pm = context.getPackageManager();
    final Parameters p = camera.getParameters();
    if (isFlashSupported(pm)) {
        boolean on = ((ToggleButton) view).isChecked();
        if (on) {
            Log.i("info", "torch is turn on!");
            p.setFlashMode(Parameters.FLASH_MODE_TORCH);
            camera.setParameters(p);
            camera.startPreview();
        } else {
            Log.i("info", "torch is turn off!");
            p.setFlashMode(Parameters.FLASH_MODE_OFF);
            camera.setParameters(p);
            camera.stopPreview();
        }

Camera :

 ImageButton ib = (ImageButton) findViewById(R.id.buttonToast);
    ib.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            startActivityForResult(i, CAPTURE_IMAGE_CAPTURE_CODE);
        }
    });

Upvotes: 1

Ibrahim AbdelGawad

Reputation: 553

Try to turn on the flashlight in background then open your front camera. actually you can turn front camera and flashlight in background.

Here how to open flashlight in background: this

Here how to turn on camera in background: this

Upvotes: 1

Michele La Ferla

Reputation: 6884

The following code checks for the availability of a front camera:

private Camera openFrontFacingCameraGingerbread() {
    int cameraCount = 0;
    Camera cam = null;
    Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
    cameraCount = Camera.getNumberOfCameras();
    for (int camIdx = 0; camIdx < cameraCount; camIdx++) {
        Camera.getCameraInfo(camIdx, cameraInfo);
        if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
            try {
                cam = Camera.open(camIdx);
            } catch (RuntimeException e) {
                Log.e(TAG, "Camera failed to open: " + e.getLocalizedMessage());
            }
        }
    }

    return cam;
}

Then add the following permissions in the AndroidManifest.xml file:

<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" android:required="false" />
<uses-feature android:name="android.hardware.camera.front" android:required="false" />

Note: This feature is available in Gingerbread(2.3) and Up Android Version.

I recommend using surfaceView like in this example to implement a working flashlight.

Hope this helps :)

Upvotes: 0

How to turn on flashlight and front camera at the same time in android

Answers (3)

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