flashlight

问题 Following is the code which I used for opening Torch and closing it. But when I close it, it crashes. LogCat says " Runtime Exception : Fail to connect to camera service "! + hasFlash is not getting any value and is throwing Nullpointer exception. (I'm using it to check if the flash is present or not.) What am I doing Wrong? boolean hasFlash = this.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH); if(hasFlash==true) { if(s.equalsIgnoreCase("FlashLight On") || s

问题 This is my source code for barcode snanner which I post again. I edited my code. The problem is, when i run app, flash light is not turned on automatically. I added permission in manifest file, but flash light did not turn on. please help me where is the problem? I am using HTC wIldfire s mobile. public final class CameraManager { private static final String TAG = CameraManager.class.getSimpleName(); private static final int MIN_FRAME_WIDTH = 240; private static final int MIN_FRAME_HEIGHT =

问题 after reading all the posts of the other users with the same problem I was able to create a simple working app for turning on flash light on my Nexus 5, this is the "OnCreate()" method: @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Camera mCamera; SurfaceView preview; mCamera = Camera.open(); Parameters params = mCamera.getParameters(); params.setFlashMode(Parameters.FLASH_MODE_TORCH); mCamera

问题 I am writing an app that sets the flash mode to torch. I have been testing the application on my Droid X, and the LED light does not come on. I tried it on a Droid Incredible and it worked fine. I can't figure out what the problem is. Here is part of my code for turning on torch mode. Camera mCamera = Camera.open(); Camera.Parameters params = mCamera.getParameters(); if(params.getFlashMode() != null){ params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH); } mCamera.setParameters(params); I

问题 I have a problem regarding the camera in the most recent Marshmallow build, more specifically the flashlight. On any pre-Marshmallow version all I need to do to turn the flash on/off was the following: private void turnFlashOn(final Camera camera, int flashLightDurationMs) { if (!isFlashOn()) { final List<String> supportedFlashModes = camera.getParameters().getSupportedFlashModes(); if (supportedFlashModes != null && supportedFlashModes.contains(Camera.Parameters.FLASH_MODE_TORCH)) { mParams

问题 I have a problem regarding the camera in the most recent Marshmallow build, more specifically the flashlight. On any pre-Marshmallow version all I need to do to turn the flash on/off was the following: private void turnFlashOn(final Camera camera, int flashLightDurationMs) { if (!isFlashOn()) { final List<String> supportedFlashModes = camera.getParameters().getSupportedFlashModes(); if (supportedFlashModes != null && supportedFlashModes.contains(Camera.Parameters.FLASH_MODE_TORCH)) { mParams

问题 I am working on Flashlight app with Widget. When I turn on Flashlight with Widget flashlight is on, and when I start some app, the flashlight turns off. Why is this happening? Why can't my Flashlight run in background? How can I prevent this? I want Flashlight to be turned off only by user not the system. This is my code for widget: @Override public void onReceive(Context context, Intent intent) { RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_layout); myPref =

问题 I am trying to give some effects with led/flashlight. but it is not blinking rapidly, even i tried sleep(2), bt it takes time to blink. i want to blink it faster. public void flash_effect() throws InterruptedException { cam = Camera.open(); final Parameters p = cam.getParameters(); p.setFlashMode(Parameters.FLASH_MODE_TORCH); Thread a = new Thread() { public void run() { for(int i =0; i < 10; i++) { cam.setParameters(p); cam.startPreview(); try { Thread.sleep(50); } catch

问题 it's my first question here as I have a problem developing my first iOS app. It is one of the thousands of flashlight apps, however I'm trying to put as many features as possible to it. One of them is saving the state of the app when it goes to background or terminates. After going to foreground (iOS 4 or higher) or relaunching, I'm loading the settings from file and reapplying them. One of the settings is, obviously, the AVCaptureDevice.torchMode . However, I encounter the problem with this.

问题 My app turn on camera LED using FLASH_MODE_TORCH , but now some people say that FLASH_MODE_TORCH will not work on some Samsung devices correctly. So should I use FLASH_MODE_ON for all devices to work?(especially for Samsung devices) 回答1: may be this will help you Parameters params = null; if(mCamera != null) { params = mCamera.getParameters(); if(params != null) { List<String> supportedFlashModes = params.getSupportedFlashModes(); if(supportedFlashModes != null) { if(supportedFlashModes