Question: I have **Galaxy tab 10.1 inch**  and I have made app and test on it, it works fine.

Now my question is will this app work on Galaxy 7 inch, Galaxy 7.7 inch, Galaxy note and Galaxy 8.9 inch 

here is the details of these devices:

 **(My Device) Galaxy tab 10.1 inch -->** 800 x 1280 pixels, 10.1 inches (~149 ppi pixel density)

**Galaxy 8.9 inch**--> 800 x 1280 pixels, 8.9 inches (~170 ppi pixel density)

**Galaxy 7.7 inch** --> 800 x 1280 pixels, 7.7 inches (~196 ppi pixel density)

**Galaxy 7 inch** --> 600 x 1024 pixels, 7.0 inches (~170 ppi pixel density)

**Galaxy Note** --> 800 x 1280 pixels, 5.3 inches (~285 ppi pixel density)

Please tell me for which device I have to make layouts again and what will be the folder names for drawable and layout

Answer: 
for Galaxy 7 inch --> 600 x 1024 pixels, 7.0 inches (~170 ppi pixel density) you can make layout folder with name "layout-large-mdpi-1024x600"....but for other device i am also unable to sort correct
As long as you are using relative layout mechanisms, it wil be ok. If you want to test it yourself, you can start your application in emulators using different screen sizes. There is also a Galaxy Tab Emulator.