Develop Reference

Cursor in android studio for Mac is rectangle area

The editor keeps in inserting mode, I cannot change to the mode in "|". Two ways from the Internet have been tried, uncheck the "use block caret" and Fn+enter. Fn+i can change once for a file, but when I open another file, it still keeps in inserting mode with a rectangle area.

You should have seen this when there is a Vim option enabled in your Android studio IDE. To resolve this , double press shift which allows to search files and then search for Vim actions. Here, you should see Vim enabled is ticked. Uncheck that option to disable and your cursor becomes normal.

Go to
android studio preferences
search for "use block caret"
uncheck it

Try pressing, Command+Enter or
Command+n
or if all else fails, try exiting, and restarting Android Studio

How Android Studio will work as Notepad to stop auto correction/import/others setting

I'm learning android and using Android Studio. I'm hate when android studio do bunch of code by self. Android studio importing self and correcting me during typing that is not good for me to remember some code or libraries. I want to disable all auto correction and importing of android studio so it's editor will work as Notepad. But and want to get error only during compiling.
I want to do this, because I learn java by notepad that's why I remembered a lot of code and libraries.
After learning android, I will back to it for developing apps to save the time.

Settings > Editor > Java and then turn off whatever you want.
Or you can do something like this:
// #formatter:off
...
// #formatter:on

You can go to Settings -> Editor -> General -> Code Completion and disable Autopopup code completion, which would get you most of the way to the experience you're looking for, and if you need any help while coding you can always use Ctrl+Space to manually invoke code completion.
As for importing, you can find settings in Editor -> General -> Auto Import.

Confirm Exit Dialog When Closing Android Studio

When try to exit the Android Studio, it shows a confirmation dialogue box asking 'Do you really want to exit?'. I mistakenly check the 'Do not ask me again' check box when I tried to exit the android studio. Now, I want that confirmation dialogue box back. I checked it out under File -> Settings but I could not able to find any option to restore that feature back. And also googled it but all in vein.

For MAC users follow the following steps:
1)Select Preferences from the Android Studio menu
2)Scroll down till the IDE Settings and select the sub section General
3)In the Startup/Shutdown section, you will find Confirm application exit. Select it to enable it again
4)Press Apply
For Windows users follow the following steps:
1)Select File from the toolbar
2)Select Settings
3)Scroll down till the IDE Settings and select the sub section General
4)In the Startup/Shutdown section, you will find Confirm application exit. Select it to enable it again
5)Press Apply

Open File -> Settings
Enter exit in the search box on the top left
Click on System Settings
Check Confirm application exit
Click on Apply

1. Mac Shift+Cmd+A, Windows Ctrl+Alt+S
2. Type "Confirm application exit".
3. Switch ON / OFF in the same windows.

To enable confirmation exit
File -> settings -> General -> Tick confirm application exit

For updated answer/guide as of Android Studio 2.1.1
Go to File
Select Settings
Under Appearance & Behavior
Select System Settings
Click/Check Confirm application exit
Ctrl + Alt + S (for opening Settings shortcut) - Windows

Alternatively to the above answers, you can prefer the hackish way of altering IDE settings - by editing ide.general.xml settings file (on Windows it shall be C:\Users\<LOGIN>\.AndroidStudio\config\options folder) and altering <option name="confirmExit" value="false" /> to true :)

Android Studio documentation auto popup issue

I am new to Android Studio IDE. I was very accustomed to the Eclipse IDE and now everything seems hard to accomplish with Android Studio. One of the things which bothering me is the documentation auto popup in the settings. The popups are always overlapping the parameters info. which are important.
Does anybody know how to solve this or if it's possible at all to have the 2 options.
I've already tried changing the delays in the settings but the it's the same result.
Example image:

Go to File > Settings or do Ctrl+Alt+S
Under Editor > General
Uncheck Show quick documentation on mouse move

Android project Refactor greyed out

I renamed a project in Eclipse via 'Refactor > Rename' as suggested in this answer.
I now want to rename it again, but the Refactor menu has only one menu item now (Android > Extract Android String...) which is also greyed out!
I am using Eclipse 3.6.1 with the latest Android SDK 9.
Why is that and how to I restore this to normal?
Update (1): After following Sankar Ganesh's suggestion (selecting a string), the Refactor menu appeared again. I then selected the Rename... menu item again and I received the following error message box:
This is much better than the previous situation, in which I had no idea why the Refactor menu had been disabled and what to do. Still, I don't understand why this is and what rules I should follow when using the Refactor function. I only wanted to rename a project... that's all. :)
Update (2): I just tried the same exact operation again again (Refactor > Rename while the project is selected in Project Explorer) and it worked! (without issuing the message box shown above).
What's going on?
Must be a bug, because this is clearly inconsistent.

I was wonder,why you struggling for Renaming a project,
if you want to rename your project, then simply you can select your project, then click refactor menu, then Rename, that's it
step1:
Step2: Now see My project name is updated,initally it was friend finder, now friendfinderupdated
Also , you can use Extract Android String for Valid Java Identifiers and not for packages and files, because see window here

Pls select a String in your java code and do that Refactor -> Android -> Extract Android String, now you can see dialog, what i had shown below
and see next image

Mystery solved!
The problem turned out to be that I was trying to 'Refactor > Rename' while in the Resource perspective.
Once I switched to the Java perspective, this (inconsistent) behavior didn't repeat itself and I was even able to check the Update references checkbox.
Wow!
(thanks #Sankar Ganesh for posting the snapshots, because that allowed me to notice that there is an "Update references" checkbox and that the text on your caption bar is different than mine)