Flashlight with strobe: turn flashlight ON when wheel view value is start from 1 to 10 then thread is not stop on zero value - multithreading

Question

When the strobe value is increased from 1 to 10 the blinking of flashlight will never stop.neither it stops on zero nor it turns on beside it just get blinking and blinking constantly. here i am adding the code which i have written to do so. if someone knows the solutions please help me.
Thread is not stop thread works until you stop debugger..
cheers!
enter code here
flashButton = findViewById(R.id.flash_button);
mCameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
mCameraId = mCameraManager.getCameraIdList()[0];
} catch (CameraAccessException e) {
e.printStackTrace();
}
flashButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
try {
if (!isTorchOn) {
turnOnFlashLight();
} else {
turnOffFlashLight();
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
scrollValue = findViewById(R.id.value);
mWheel = findViewById(R.id.wheel);
mWheel.setOnScrollListener(new Wheel.OnScrollListener() {
#Override
public void onScrollStarted(Wheel view, float value, int roundValue) {
frequency = Math.abs(roundValue);
}
#Override
public void onScrollFinished(Wheel view, float value, int roundValue) {
scrollValue.setText("" + Math.abs(roundValue));
frequency = strobeFrequency(Math.abs(roundValue));
if(isTorchOn && frequency > 0) {
thread = new Thread(stroboRunner);
thread = null;
strobe(frequency);
}
else if(isTorchOn) {
strobe(0);
// thread.stop();
// thread=null;
}
}
#Override
public void onScroll(Wheel view, float value, int roundValue) {
scrollValue.setText("" + Math.abs(roundValue));
frequency = strobeFrequency(Math.abs(roundValue));
if(isTorchOn && frequency > 0) {
// thread = null;
strobe(frequency);
}
}
});
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void turnOnFlashLight() {
/*
if(frequency > 0){
scrollValue.setText("0.0");
}
*/
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
mCameraManager.setTorchMode(mCameraId, true);
} else {
try {
camParams.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
cam.setParameters(camParams);
cam.startPreview();
} catch (RuntimeException e) {
Toast.makeText(this, "Camera Permission is not granted", Toast.LENGTH_SHORT).show();
}
}
flashButton.setImageResource(R.drawable.power_on);
isTorchOn = true;
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void turnOffFlashLight() {
try {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if(thread != null){
stroboRunner.stopRunning = true;
thread = null;
}else {
mCameraManager.setTorchMode(mCameraId, false);
}
} else {
try {
if(thread != null){
stroboRunner.stopRunning = true;
thread = null;
}else {
camParams.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
cam.setParameters(camParams);
cam.stopPreview();
}
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getBaseContext(), "Exception throws in turning off flashlight.", Toast.LENGTH_SHORT).show();
}
}
flashButton.setImageResource(R.drawable.power_off);
isTorchOn = false;
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private int strobeFrequency(int roundValue) {
int freq = 0;
switch (roundValue) {
case 1:
freq = Math.abs(50);
break;
case 2:
freq = Math.abs(150);
break;
case 3:
freq = Math.abs(300);
break;
case 4:
freq = Math.abs(600);
break;
case 5:
freq = Math.abs(900);
break;
case 6:
freq = Math.abs(1200);
break;
case 7:
freq = Math.abs(1500);
break;
case 8:
freq = Math.abs(1800);
break;
case 9:
freq = Math.abs(2000);
break;
case 10:
freq = Math.abs(2300);
break;
}
return freq;
}
#Override
protected void onResume() {
super.onResume();
try {
cam = Camera.open();
camParams = cam.getParameters();
cam.startPreview();
hasCam = true;
} catch (Exception e) {
// TODO: handle exception
}
compass.start();
}
#Override
protected void onPause() {
super.onPause();
compass.stop();
}
#Override
protected void onStop() {
super.onStop();
Log.d(TAG, "stop compass");
compass.stop();
}
private void strobe(int freq) {
if(thread == null){
stroboRunner = new StroboRunner();
stroboRunner.freq = freq;
thread = new Thread(stroboRunner);
thread.start();
} else if(freq == 0 && thread!=null) {
stroboRunner.stopRunning = true;
thread = null;
// thread.stop();
}
}
private class StroboRunner implements Runnable {
int freq;
boolean stopRunning = false;
#Override
public void run() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
try {
while (!stopRunning) {
mCameraManager.setTorchMode(mCameraId, true);
Thread.sleep(2600 - freq);
System.out.println(""+(2600-freq));
// Toast.makeText(MainActivity.this, ""+(2600-freq), Toast.LENGTH_SHORT).show();
mCameraManager.setTorchMode(mCameraId, false);
Thread.sleep(freq);
}
} catch (CameraAccessException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
// thread=null;
} else {
Camera.Parameters paramsOn = cam.getParameters();
Camera.Parameters paramsOff = camParams;
paramsOn.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
paramsOff.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
try {
while (!stopRunning) {
cam.setParameters(paramsOn);
cam.startPreview();
Thread.sleep(2600 - freq);
cam.setParameters(paramsOff);
cam.startPreview();
Thread.sleep(freq);
}
} catch (Exception e) {
// TODO: handle exception
}
}
}
}