How to restart an activity

I have created an activity. I made the launch mode as singleTask in manifest file. I donot want multiple instance of the same activity should start. I am lunching this activity on button click of another activity.

If i click the button more than once then as i have made the activity as single task then If the activity already running then nothing happens. 开发者_高级运维But I want to relaunch the activity without creating another instance. How to achieve this.

Thanks Deepak

But I want to relaunch the activity without creating another instance  

What you meant my relaunch without creating. I think you may have set of code that you have placed in your onCreate and you want to run when the activity again got control. If so its better for you to place that code to your onResume or onNewIntent. Because onCreate of the single task will only execute once

singleTask
The system creates the activity at the root of a new task and routes the intent to it. However, if an instance of the activity already exists, the system routes the intent to existing instance through a call to its onNewIntent() method, rather than creating a new one.