Even using your code, in LogCat i get:
open
second open
fail to open camera
This happens even after rebooting the phone, however all other
applications that use the camera still work.
On Feb 7, 2:45 am, v bobbywink <vvnevercha...@gmail.com> wrote:
> well, i think camera has crashed and in the condition u can't get
> camera service. U must reboot phone.
> when using hardware , u should be careful. u can open Camera in
> onStart() and release Camera in onStop(). Can't open camera many times
> in activity, when task finish u must release it .
> sample code
> private void turnLightOn() {
> if (false == mIsFlashOpen) {
> if (null == mCamera) {
> try {
> Log.e(TAG, "open");
> mCamera =Camera.open(CameraInfo.CAMERA_FACING_BACK);
> } catch (RuntimeException e) {
> try {
> Thread.sleep(500);
> Log.e(TAG, "second open");
> mCamera =Camera.open(CameraInfo.CAMERA_FACING_BACK);
> } catch (Exception sube) {
> Log.e(TAG, "fail to open camera");
> sube.printStackTrace();
> mCamera = null;
> }
> }
> }
> if (null != mCamera) {
> Parameters parameters = mCamera.getParameters();
> if (parameters == null) {
> return;
> }
> List<String> flashModes =
> parameters.getSupportedFlashModes();
> // Check if camera flash exists
> if (flashModes == null) {
> return;
> }
> String flashMode = parameters.getFlashMode();
> if (!Parameters.FLASH_MODE_TORCH.equals(flashMode)) {
> // Turn on the flash
> if
> (flashModes.contains(Parameters.FLASH_MODE_TORCH)) {
>
> parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
> mCamera.startPreview();
> mCamera.setParameters(parameters);
> mRightBtn.setEnabled(true);
> } else {
> Log.e(TAG, "FLASH_MODE_TORCH not supported");
> }
> }
> }
> }
> }
>
> private void turnLightOff() {
> if (mIsFlashOpen) {
> mIsFlashOpen = false;
> if (mCamera == null) {
> return;
> }
> Parameters parameters = mCamera.getParameters();
> if (parameters == null) {
> return;
> }
> List<String> flashModes =
> parameters.getSupportedFlashModes();
> String flashMode = parameters.getFlashMode();
> // Check if camera flash exists
> if (flashModes == null) {
> return;
> }
> if (!Parameters.FLASH_MODE_OFF.equals(flashMode)) {
> // Turn off the flash
> if (flashModes.contains(Parameters.FLASH_MODE_OFF)) {
>
> parameters.setFlashMode(Parameters.FLASH_MODE_OFF);
> mCamera.setParameters(parameters);
> mCamera.stopPreview();
> } else {
> Log.e(TAG, "FLASH_MODE_OFF not supported");
> }
> }
> }
> }
>
> On 2月7日, 下午1时14分, Matt Clark <mrclark32...@gmail.com> wrote:
>
>
>
>
>
>
>
> > Even as hundreds of other have made them, i am trying my hand at a
> > flashlight app. I have the basic GUI and widget working and toggling,
> > and i just attempted to implement the actual flash from the phone.
> > I have found many places that this is most easily done with this
> > snippet of code:
>
> > Camera mCamera =Camera.open();
> > Parameters params = mCamera.getParameters();
> > params.setFlashMode( Parameters.FLASH_MODE_TORCH );
> > mCamera.setParameters( params );
>
> > I have tried this code, and every time i run the app it crashes,
> > giving me an output in LogCat of the following:
>
> > 02-07 00:04:49.130: E/AndroidRuntime(4861): Caused by:
> > java.lang.RuntimeException: Fail to connect to camera service
>
> > Every other app that uses the camera or flash works fine, and i have
> > no idea what is causing it to fail.
>
> > In my android manifest i have:
>
> > <uses-permission android:name="android.permission.FLASHLIGHT" />
> > <uses-parmission android:name="android.permission.CAMERA" />
> > <uses-feature android:name="android.hardware.camera" />
> > <uses-feature android:name="android.hardware.camera.flash" />
>
> > Any and all help is greatly appreciated as I am completely stuck after
> > sitting at this for the last several hours...
> > Thanks
> > ~Matt
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