How to Call Auto Launched Flow from Apex
Since Summer’14, it has been possible to invoke a Flow from Apex, to call a flow from Apex, and use the Flow.
Interview class which provides methods the flow in Salesforce can be launched without user Interaction such as from a process builder or the apex code. So here we are creating an auto-launched flow and calling it through the apex code.
So, without any further ado, let’s begin!
Step By Step Process to Build Auto-Launched Flow and Call it from Apex
Please note that Auto-launched does not require any user interaction; it can be auto-launched when a record is changed while DML.
Here is a walkthrough of the steps and code involved to call Auto launched Flow from Apex.
Step 1: Go to the Setup Menu and write Flow in the Search Box.
Step 2: Click New and Select Auto Launched Flow Then Click Next
Step 3: Create Resource Variable for Record Id and Get Account Name
Step 3.1 Get Account Name
Step 4: Secondly, to get opportunity records we have added the ‘Get Records’ element in the flow. Furthermore, we assign the Account Name field to the Account Name variable as shown in the below image.
Step 5: Now we activate And Save This Flow and Call It from Apex With Flow.Interview.flowName And Start Flow By using Start (). Method
Step 6: Execute the code. To call flow you will notice we have created the instance of the Interview object and passed Account Id as a parameter.
Code
Step 7: OUTPUT
Conclusion
So, here is how you can call flow by Apex. Follow the above steps and share your experience with us. Also, be sure to check out our blog for more interesting Salesforce development solutions. We will keep you posted!
India 
USA
UK
Canada