i already explained that if i use math block as a input then i will get the value as 0.01 and while using String it include f as 0.01f and setAlpha() method only work with value which is in float.
So you can set the input type of the value parameter to float 
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The users can use the math blocks. 
Basically, setAlpha method takes a float.
sur @MohamedTamer i try to pre define it . just set the value to 0.05 it make full transparent and if i set value more than 1 then it will be fully opaque. and but when i set the value to 0.05f it works fine and the transparency is 50%.
It's just nature - if a float is required, you would expect to input a float and not text. Not to worry, if you are happier with the text input, that is not a big deal.
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sur @ChrisWard i am making another extension . so, if anyone disturb me for explaining what my extension does and why i don't use math block. then, how can i create my new extension
Separate your work loads. You can do your coding work first and when it's time for a break (coffee usually an essential item), peruse the Forum to see if there are any questions you feel must be answered.
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Never heard of it, do you mean Float.parseFloat()?
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İt's awesome thanks
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