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Exception java.lang.RuntimeException: setParameters failed

I am getting following error
Exception java.lang.RuntimeException: setParameters failed
android.hardware.Camera.native_setParameters (Camera.java)
android.hardware.Camera.setParameters (Camera.java:1946)
in code below. I have no clue what wrong i am doing below.
Camera mCamera = Camera.open();
Parameters params = mCamera.getParameters();
if (params.getFlashMode() != null)
params.setFlashMode(Parameters.FLASH_MODE_OFF);
if (nightMode && params.getSceneMode() != null)
params.setSceneMode(Parameters.SCENE_MODE_NIGHT);
if (params.getSupportedFocusModes().contains(Parameters.FOCUS_MODE_CONTINUOUS_VIDEO)) {
params.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
} else if (params.getSupportedFocusModes().contains(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
params.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
} else if (params.getSupportedFocusModes().contains(Camera.Parameters.FOCUS_MODE_INFINITY)) {
params.setFocusMode(Parameters.FOCUS_MODE_INFINITY);
}
mCamera.setParameters(params);
this error is occurring in some devices like samsung mostly.
Requesting for help.Thanks in advance.

Your params could be not supported by device. You can detect available focus modes with getSupportedFocusModes method of Camera.Parameters class. If some mode doesn't contain in this list, you can't set it to your camera.
Edit
As Alex said in comment you can see error message in logcat.

you must check if the focus mode supported by the user device, not all devices has camera focus mode, you do it like this:
public boolean support_focus(Camera camera){
Camera.Parameters parameters = camera.getParameters();
List<String> focusModes = parameters.getSupportedFocusModes();
if (focusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO))
return true;
else
return false;
}
this check if device support FOCUS_MODE_AUTO, change that with your desired Parameter.

Android how to know if flashlight is on

I am using CameraManager and CameraCharacteristics
I would like to know how to check if the flashlight is turned on

Try this bit of code
public boolean FlashStatus() {
Camera.Parameters parameters = camera.getParameters();
return parameters.getFlashMode() == "FLASH_MODE_TORCH";
}

LED flashlight on xperia Z5

I am using following code to turn LED flashlight on and off:
public Flashlight(SurfaceView preview, Context context){
this.preview = preview;
this.context = context;
mHolder = preview.getHolder(); //mHolder is surfaceHolder
mHolder.addCallback(this);
try {
mCamera = Camera.open();
params = mCamera.getParameters();
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
//AUTOFOCUS LASER FIX ON LG G3
List<String> focusModes = params.getSupportedFocusModes();
if (focusModes.contains(params.FOCUS_MODE_INFINITY)) {
params.setFocusMode(params.FOCUS_MODE_INFINITY);
}
else{
if (focusModes.contains(params.FOCUS_MODE_FIXED))
params.setFocusMode(params.FOCUS_MODE_FIXED);
}
mCamera.setParameters(params);
cameraOpened = true;
}catch (Exception e){
cameraOpened = false;
e.printStackTrace();
}
}
private void turnOnFlashlight(){
flashlightOn = true;
params.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(params);
}
private void turnOffFlashlight(){
flashlightOn = false;
params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
mCamera.setParameters(params);
}
It works great on most phones but I cant get it working on xperia Z5. I dont have Z5 for testing so I only know it from user response. So I would like to ask if there is any other (preferably working) way to turn on flashlight on Xperia Z5.
Thanks in forward

As already mentioned in the comment, I found there to be 3 steps of making the flash appear (seems to be working on all devices so far)
cam.setParameters(p); // will trigger flash on most devices
// Needed for some devices.
cam.setPreviewTexture(new SurfaceTexture(0));
// Needed for some more devices.
cam.startPreview();
Since you did 2 of those, try adding the PreviewTexture and it should work. The whole code of a working flashlight can be found here at Flashlight Widget

How to turn on FlashLight in Lollipop programmatically Android

Camera cam = Camera.open();
Parameters p = cam.getParameters();
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
cam.setParameters(p);
cam.startPreview();
The above dose not work on Lollipop, Because Camera is deprecated in Lollipop. I cant able to find any other way to turn on flash programmatically in Lollipop. How can I achieve this. Thanks in advance.

Camera class is now deprecated.
For LOLLIPOP above you need to use camera2 Api
so nickkadrov's solution doesent work for 6.0 & above device,best way to on/off flash light is try code below
public static void toggleFlashLight(){
toggle=!toggle;
try {
CameraManager cameraManager = (CameraManager) getApplicationContext().getSystemService(Context.CAMERA_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
for (String id : cameraManager.getCameraIdList()) {
// Turn on the flash if camera has one
if (cameraManager.getCameraCharacteristics(id).get(CameraCharacteristics.FLASH_INFO_AVAILABLE)) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
cameraManager.setTorchMode(id, true);
}
}
}
}
} catch (Exception e2) {
Toast.makeText(getApplicationContext(), "Torch Failed: " + e2.getMessage(), Toast.LENGTH_SHORT).show();
}
}
where toggle is class level static Boolean variable whose default value is false
static boolean toggle=false;

mCam = Camera.open();
Camera.Parameters p = mCam.getParameters();
p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
mCam.setParameters(p);
mPreviewTexture = new SurfaceTexture(0);
try {
mCam.setPreviewTexture(mPreviewTexture);
} catch (IOException ex) {
// Ignore
}
mCam.startPreview();
It works for me on Android 5.0.x. And don't forget to add permission in manifest for camera usage.
<uses-permission android:name="android.permission.CAMERA" />

Your code should actually work. Please check if you added the permission for using the camera properly:
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT"/>
This should be added to your AndroidManifest above of your other specifications.
Additionally, there is an interesting discussion about different devices and an example which should work on every device here: Flashlight in Android
If you dont want to use the deprecated API, you can check out:
Package Summary of Camera2
Camera device specification on the new api
Unfortunately I can not give you an example for using the new API, because I did not use it myself yet.

Turn on flashlight of camera phone

What I would do is simply turn on flash led of my phone by press a button. As I could read, it appear too much simple, but code I've found doesn't work!
This is how I turn on led at click on button: +
private void cameraOn() {
params = camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(params);
camera.startPreview();
torch_button.setText("Switch off");
isTorchOn = true;
}
Params and camera object was initialized inside onCreate method. No error is thrown, but light doesn't switch on.
what's wrong?

Looks like this one has possibly already been answered
How to turn on camera flash light programmatically in Android?
But basically you need to have the correct permissions.
<!-- Allows access to the flashlight -->
<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" />

The problem could be another application holding the camera. Your code seems to be right.
I had done it successfully with this code :
Parameters p = null;
try {
p = camera.getParameters();
} catch (Exception e) {
e.printStackTrace();
}
if (isLightOn) {
Log.e("info", "turning off!");
p.setFlashMode(Parameters.FLASH_MODE_OFF);
camera.setParameters(p);
camera.stopPreview();
isLightOn = false;
} else {
Log.e("info", "turning on!");
p.setFlashMode(Parameters.FLASH_MODE_TORCH);
camera.setParameters(p);
camera.startPreview();
isLightOn = true;
}