fix(android): fixes the enableLight and disableLight methods

Enable and disableLight now prepare the camera if not already prepared. Also light is no longer
enabled if enableLight was called, camera access denied, and scan was called and camera permission
accepted.

src/android/QRScanner.java

@@ -48,7 +48,8 @@ public class QRScanner extends CordovaPlugin implements BarcodeCallback {
  //Preview started or paused
  private boolean previewing = false;
  private BarcodeView mBarcodeView;
- private boolean switchFlashOn;
+ private boolean switchFlashOn = false;
+ private boolean switchFlashOff = false;
  private boolean cameraPreviewing;
  private boolean scanning = false;
  private CallbackContext nextScanCallback;
@@ -164,8 +165,15 @@ public void run() {
  else if (action.equals("disableLight")) {
  cordova.getThreadPool().execute(new Runnable() {
  public void run() {
- switchFlashOn = false;
- disableLight(callbackContext);
+ switchFlashOff = true;
+ if (hasFlash()) {
+ if (!hasPermission()) {
+ requestPermission(33);
+ } else
+ disableLight(callbackContext);
+ } else {
+ callbackContext.error(QRScannerError.LIGHT_UNAVAILABLE);
+ }
  }
  });
  return true;
@@ -246,29 +254,31 @@ private String boolToNumberString(Boolean bool) {
  return "0";
  }
 
- private void doswitchFlash(final boolean toggleLight, final CallbackContext callbackContext) throws IOException, CameraAccessException {
- if (mBarcodeView == null) {
- lightOn = true;
+ private void doswitchFlash(final boolean toggleLight, final CallbackContext callbackContext) throws IOException, CameraAccessException { //No flash for front facing cameras
+ if (getCurrentCameraId() == Camera.CameraInfo.CAMERA_FACING_FRONT) {
+ callbackContext.error(QRScannerError.LIGHT_UNAVAILABLE);
+ return;
+ }
+ if (!prepared) {
+ if (toggleLight)
+ lightOn = true;
+ else
+ lightOn = false;
  prepare(callbackContext);
  }
- //No flash for front facing cameras
- if (getCurrentCameraId() == Camera.CameraInfo.CAMERA_FACING_FRONT) {
- callbackContext.error(QRScannerError.LIGHT_UNAVAILABLE);
- return;
- }
- cordova.getActivity().runOnUiThread(new Runnable() {
- @Override
- public void run() {
- if (mBarcodeView != null) {
- mBarcodeView.setTorch(toggleLight);
- if (toggleLight)
- lightOn = true;
- else
- lightOn = false;
- }
- getStatus(callbackContext);
+ cordova.getActivity().runOnUiThread(new Runnable() {
+ @Override
+ public void run() {
+ if (mBarcodeView != null) {
+ mBarcodeView.setTorch(toggleLight);
+ if (toggleLight)
+ lightOn = true;
+ else
+ lightOn = false;
  }
- });
+ getStatus(callbackContext);
+ }
+ });
  }
 
  public int getCurrentCameraId() {
@@ -344,8 +354,10 @@ public void onRequestPermissionResult(int requestCode, String[] permissions,
  denied = false;
  switch (requestCode) {
  case 33:
- if(switchFlashOn)
+ if(switchFlashOn && !scanning && !switchFlashOff)
  switchFlash(true, callbackContext);
+ else if(switchFlashOff && !scanning)
+ switchFlash(false, callbackContext);
  else {
  setupCamera(callbackContext);
  if(!scanning)
@@ -533,42 +545,42 @@ public void run() {
  }
 
  private void scan(final CallbackContext callbackContext) {
- scanning = true;
- if (!prepared) {
- shouldScanAgain = true;
- if (hasCamera()) {
- if (!hasPermission()) {
- requestPermission(33);
- } else {
- setupCamera(callbackContext);
- }
+ scanning = true;
+ if (!prepared) {
+ shouldScanAgain = true;
+ if (hasCamera()) {
+ if (!hasPermission()) {
+ requestPermission(33);
+ } else {
+ setupCamera(callbackContext);
  }
- } else {
- if(!previewing) {
- this.cordova.getActivity().runOnUiThread(new Runnable() {
- @Override
- public void run() {
- if(mBarcodeView != null) {
- mBarcodeView.resume();
- previewing = true;
- if(switchFlashOn)
- lightOn = true;
- }
- }
- });
- }
- shouldScanAgain = false;
- this.nextScanCallback = callbackContext;
- final BarcodeCallback b = this;
+ }
+ } else {
+ if(!previewing) {
  this.cordova.getActivity().runOnUiThread(new Runnable() {
  @Override
  public void run() {
- if (mBarcodeView != null) {
- mBarcodeView.decodeSingle(b);
+ if(mBarcodeView != null) {
+ mBarcodeView.resume();
+ previewing = true;
+ if(switchFlashOn)
+ lightOn = true;
  }
  }
  });
  }
+ shouldScanAgain = false;
+ this.nextScanCallback = callbackContext;
+ final BarcodeCallback b = this;
+ this.cordova.getActivity().runOnUiThread(new Runnable() {
+ @Override
+ public void run() {
+ if (mBarcodeView != null) {
+ mBarcodeView.decodeSingle(b);
+ }
+ }
+ });
+ }
  }
 
  private void cancelScan(final CallbackContext callbackContext) {
@@ -634,12 +646,15 @@ public void run() {
  }
 
  private void enableLight(CallbackContext callbackContext) {
+ lightOn = true;
  if(hasPermission())
  switchFlash(true, callbackContext);
  else callbackContext.error(QRScannerError.CAMERA_ACCESS_DENIED);
  }
 
  private void disableLight(CallbackContext callbackContext) {
+ lightOn = false;
+ switchFlashOn = false;
  if(hasPermission())
  switchFlash(false, callbackContext);
  else callbackContext.error(QRScannerError.CAMERA_ACCESS_DENIED);