优化细节

lib/src/main/java/com/king/zxing/CaptureHelper.java

@@ -242,6 +242,7 @@ public class CaptureHelper implements CaptureLifecycle,CaptureTouchEvent,Capture
     public void onPause(){
         if (captureHandler != null) {
             captureHandler.quitSynchronously();
+            captureHandler = null;
         }
         inactivityTimer.onPause();
         ambientLightManager.stop();
@@ -526,6 +527,7 @@ public class CaptureHelper implements CaptureLifecycle,CaptureTouchEvent,Capture
         }
 
         if(isPlayBeep){//如果播放音效，则稍微延迟一点，给予播放音效时间
+            if(captureHandler != null){
                 captureHandler.postDelayed(() -> {
                     //如果设置了回调，并且onCallback返回为true，则表示拦截
                     if(onCaptureCallback!=null && onCaptureCallback.onResultCallback(text)){
@@ -536,6 +538,7 @@ public class CaptureHelper implements CaptureLifecycle,CaptureTouchEvent,Capture
                     activity.setResult(Activity.RESULT_OK,intent);
                     activity.finish();
                 },100);
+            }
             return;
         }