Android studio format document

Code formatting

While your code might follow any preferred style—in our experience—teams of developers might find it more productive to:

• Have a single, shared style, and
• Enforce this style through automatic formatting.

The alternative is often tiring formatting debates during code reviews, where time might be better spent on code behavior rather than code style.

Automatically formatting code in Android Studio and IntelliJ

Install the Dart plugin (see Editor setup) to get automatic formatting of code in Android Studio and IntelliJ. To automatically format your code in the current source code window, use Cmd+Alt+L (on Mac) or Ctrl+Alt+L (on Windows and Linux). Android Studio and IntelliJ also provides a check box named Format code on save on the Flutter page in Preferences (on Mac) or Settings (on Windows and Linux) which will format the current file automatically when you save it.

Automatically formatting code in VS Code

Install the Flutter extension (see Editor setup) to get automatic formatting of code in VS Code.

To automatically format the code in the current source code window, right-click in the code window and select Format Document . You can add a keyboard shortcut to this VS Code Preferences.

To automatically format code whenever you save a file, set the editor.formatOnSave setting to true .

Automatically formatting code with the ‘flutter’ command

You can also automatically format code in the command line interface (CLI) using the flutter format command:

Using trailing commas

Flutter code often involves building fairly deep tree-shaped data structures, for example in a build method. To get good automatic formatting, we recommend you adopt the optional trailing commas. The guideline for adding a trailing comma is simple: Always add a trailing comma at the end of a parameter list in functions, methods, and constructors where you care about keeping the formatting you crafted. This helps the automatic formatter to insert an appropriate amount of line breaks for Flutter-style code.

Here is an example of automatically formatted code with trailing commas:

And the same code automatically formatted code without trailing commas:

Except as otherwise noted, this work is licensed under a Creative Commons Attribution 4.0 International License, and code samples are licensed under the BSD License.

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Different Ways to Format Code in Android Studio

Code formatting is very important when you are building an Android application. This will help you to organize your code properly and to maintain your code to make it easily readable. Below is a list of purposes of having a standard coding format.

Purposes of Having Coding Standards

• A coding standard gives a uniform appearance to the codes written by different engineers.
• It improves the readability, and maintainability of the code, and it reduces complexity also.
• It helps in code reuse and helps to detect errors easily.
• It promotes sound programming practices and increases the efficiency of the programmers.

In this article, we will take a look at different ways to format the code in Android Studio. We are going to discuss three different methods with the help of which we can format the code in our Android Studio.

• Method 1: By using a shortcut key for formatting a code in any file in Android Studio
• Method 2: Formatting a code from MenuBar
• Method 3: By using different shortcut keys for formatting our code

Method 1: By using a shortcut key for formatting a code in any file in Android Studio

In this method, we simply have to navigate to the file in which we have to format our code. After opening the file we have to simply press the shortcut key as Ctrl+Alt+L to reformat the code in your file. With this key, the code in your file will be rearranged according to the code standards. You can get to see below image 1 in which our code is not formatted properly and after pressing this shortcut key our code will be formatted as shown in the second image.

Unformatted code which we have written.

Formatted code which we get after pressing Ctrl+Alt+L

Shortcut keys for different Operating Systems

Shortcut key

Windows	Ctrl+Alt+L
Mac OS	Option+Cmd+L
Linux	Ctrl+Shift+Alt+L

Method 2: Formatting a code from MenuBar

In this method, we will rearrange our code from the Menu Bar. To format our code navigate to the file in which we have to format our code and inside that file. Navigate to the top bar and click on the Code option and inside that option click on Reformat code option which is shown in the below screenshot.

After clicking on this option your code will be formatted as shown in the above screenshot

Note: This method will be similar for all the operating systems

Method 3: By using different shortcut keys for formatting our code

Navigate to the file in which we have to format our code and then click on the shortcut key as Ctrl+Shift+Alt+L after clicking this key you will get to see the below dialog on your screen. Select the formatting options and your code will be formatted and rearranged according to selected options. The options present inside this dialog box is explained below.

After selecting the option on this dialog make sure to run it to format your code

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Auto format code in Android Studio/Intellij IDEA

Every organization/company has certain rules for code formatting and many times developer forget about these rules and face lot of issues like merge conflicts, Jenkins builds getting failed etc. to solve this you can use a utility MACROS available in all Android Studio and all other IntelliJ products.

Record the macro

• Open any file in the editor.
• From the main menu, select Edit | Macros | Start Macro Recording.
• Press ⌥⌘L to reformat code (Code | Reformat Code ). Then press ⌘S to save all changes (File | Save All ). Android Studio/IntelliJ IDEA will show the performed actions in the status bar.

• Stop recording by selecting Edit | Macros | Stop Macro Recording.
• In the Enter Macro Name dialog, specify the name for the new macro and click OK.

• If the macro is intended for temporary use only, you can leave the name blank.

Play back a macro

• To play back a temporary macro, open the Edit menu, point to Macros, and click Play Back Last Macro.
• To play back a named macro, open the Edit menu, point to Macros, and click the necessary macro name.

Edit macros

• Open the Edit menu, point to Macros, and click Edit Macros.

Bind a keyboard shortcut to a macro

• In the Settings/Preferences dialog ⌘,, select Keymap.
• Expand the Macros node and select the created Reformat and Save macro.
• Right-click the macro and choose Add Keyboard Shortcut in the context menu

• In the Enter Keyboard Shortcut dialog, press ⌘S to be used as the shortcut and click OK.
• Android Studio/IntelliJ IDEA will warn you that the shortcut is assigned to another action. Click Remove to remove the ⌘S shortcut for the File | Save All action. You can always reassign it later if necessary.
• Click OK to apply the changes.

Now, when you press ⌘S, Android Studio/IntelliJ IDEA will invoke the new macro: reformat the current file and save your project.

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11 Android Studio Shortcuts every Android Developer must know

This is how you may end up if you try and take a shortcut in real life, but it’s not true for the world of software !! Here you are encouraged to take shortcuts like auto complete, code generations, snippets and what not…

A software engineer must know all the shortcuts of the IDE he is using and must have the environment BENT to his will. Given a keyboard he must be able to navigate through the IDE all around. This can increase his productivity manifolds and is also less distracting than shifting to a mouse/touchpad during typing.

As an Android Engineer I can only speak of Android Studio and here I will mention my top 11 most useful Android Studio Shortcuts ( Windows / Mac ):

This is the holy grail of the navigational shortcuts. It’s really simple. Search Android assets, navigate to the Gradle files, image resources, layouts, colors.xml and much more. There is nowhere you can’t go with the Double Shift shortcut.

Just press Shift twice and a hovering menu will po2.pup. Something like this :

As you can see I searched for “color” and it presented me with all the file with name color. This is my favorite one and I use it a lot in Android Studio.

More often than not, you’ll not be working with all the project files at once. You would be working on a specific module in a project and will be playing around some specific files of that module. The Android Studio has an option where you can browse the most recently opened files on the go. Just press CTRL + E for windows and Command + E for mac and a list of recently opened files will popup.

So did you forgot what’s the shortcut for a replace action ? You forgot what’s the shortcut for a find action ? CTRL + SHIFT + A got you !! You can find actions such as Replace, Find, Run, Instant Run etc…

I searched for the Run action and it gave me all the run options Android Studio has to offer like running the garbage collector and debug runner.

This option is particularly useful if you want to search for some variable or method names. Many a times it so happens that you have declared a variable in some local code and forgot it’s origin, or you may want to find all the places it has been initialized or assigned some value. Well, android studio makes this very easy. Just press CTRL+ALT+SHIFT+N on Windows or Command+Option+O on Mac and type/guess a part of the variable name. Android studio will present you with a list of all possible options.

It can be time consuming to type out all the boilerplate code such as getters/setters in model classes, toString implementation, Parcelable Implementation and much more. Android Studio does all this for you. Press ALT+Insert on Windows or Command+N on Mac and android studio will list out all the options that are available such as override methods, implement interfaces, toString implementation etc…

Code Generation Android Studio Shortcut

When extending a Fragment or Activity class, you need to override certain methods such as onCreate and onCreateView. Apart from that you can also override lifecycle methods such as onPause, onResume, onDestroy. Android studio generates all this boilerplate code for you. Just press CTRL+O on Windows or Command+O on Mac and you’ll be presented with a list of methods that you can override.

You can see there are hundreds of methods which can be overridden and it is not possible to remember them all. So this shortcut comes in handy during development phase. You can also start typing a part of the name of method you want to override and the list will filter automagically.

If you want to delete the entire line, no need to select using a mouse or pressing backspace for the whole day. Just press CTRL+Y on Windows or Command+Backspace on Mac and you are good to go.

Forgot what all parameters your method requires ? Methods such as rawQuery (for SQLite) use many many parameters which are hard to remember. Here’s where Android Studio comes to the rescue. Just press CTRL+Space on Windows or Command+Space on Mac and you will be presented with a popup of all the variants of a method and the arguments that it expects.

Basic Completion Android Studio Shortcut

This feature is also demonstrated in the previous image. Notice the popup box in grey. This is the documentation box. Just like that we can view the documentation of a particular method, including the class it extends from and some links to more details. Press CTRL+Q on Windows or Command+J on Mac and the popup box will show up. It requires an active internet connection.

Every developer is familiar with the callback hell, OnClickListeners, Dialog Click Listeners etc… These are anonymous classes that have multitudes of methods that need to be overridden. If you have a large codebase, then looking at such code can be daunting. Android Studio provides this option of collapsing all the blocks of code, just showing the method names so that you can find the method you are looking for easily, or just close out all other distractions and make your IDE look neat!!

To expand or collapse code blocks press CTRL+ +/- on Windows or Command + +/- on Mac. Have a look at the image below. The file looks so neat, showing only the method names :

Collapse/Expand Android Studio Shortcut

Again this is one of the most important shortcut that you can use. No need to manually indent all the nested if blocks or the for loops. Android Studio takes care of all the formatting. Just Press CTRL+ALT+L on Windows or Command+Option+L on Mac. The android studio will reformat all the code for you.

And the good part is that it works for XML layouts as well. It takes care of ordering of the xml attributes and indenting nested layouts in your code so that you focus more on coding and less on figuring out what is nested under what.

So, this was my list of 11 most useful Android Studio Keyboard Shortcuts. These have helped me improve my productivity manifolds and hope it does for you as well.

Don’t forget to follow me on LinkedIn and Quora . If you have any questions or suggestions just drop a comment below and I’ll be happy to help.

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