Command Line To Generate A New Key Android Studio

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  • Mar 26, 2018  In this video, I walked you through how to generate the SHA-1 key using the command prompt. You can use any one of those commands: 1st method: keytool -list -v -keystore /.android/debug.keystore.
  • To use your token to authenticate to an organization that uses SAML SSO, authorize the token for use with a SAML single-sign-on organization. Using a token on the command line. Once you have a token, you can enter it instead of your password when performing Git operations over HTTPS.

Jun 06, 2019  Alternatively, you can use the following command line to generate a new key: keytool -genkeypair -alias upload -keyalg RSA -keysize 2048 -validity 9125 -keystore keystore.jks This key must be a 2048 bit RSA key and have 25-year validity.

Contents
  • Installation and setup
  • Creating projects
  • Running and debugging
  • Fast edit and refresh development cycle
  • Editing tips for Flutter code
    • Assists & quick fixes
  • Troubleshooting

Installation and setup

Follow the Set up an editorinstructions to install the Dart and Flutter plugins.

Updating the plugins

Updates to the plugins are shipped on a regular basis.You should be prompted in the IDE when an update is available.

To check for updates manually:

  1. Open preferences (Android Studio > Check for Updates on macOS,Help > Check for Updates on Linux).
  2. If dart or flutter are listed, update them.

Creating projects

You can create a new project in one of several ways.

Creating a new project

To create a new Flutter project from the Flutter starter app template:

  1. In the IDE, click Create New Project from the Welcomewindow or File > New > Project from the main IDE window.
  2. Select Flutter in the menu, and click Next.
  3. Enter your desired Project name and Project location.
  4. If you might publish this app, set the company domain.
  5. Click Finish.

Setting the company domain

When creating a new app, some Flutter IDE plugins ask for an organization name in reverse domain order, something like com.example. Along with the name of the app, this is used as the package name for Android, and the Bundle ID for iOS when the app is released. If you think you might ever release this app, it is better to specify these now. They cannot be changed once the app is released. Your organization name should be unique.

Creating a new project from existing source code

To create a new Flutter project containing existing Flutter source codefiles:

  1. In the IDE, click Create New Project from theWelcome window or File > New > Projectfrom the main IDE window.

    Important: Do not use the New > Project from existing sources option for Flutter projects.

  2. Select Flutter in the menu, and click Next.
  3. Under Project location enter, or browse to,the directory holding yourexisting Flutter source code files.
  4. Click Finish.

Editing code and viewing issues

The Flutter plugin performs code analysis that enables the following:

  • Syntax highlighting.
  • Code completions based on rich type analysis.
  • Navigating to type declarations (Navigate > Declaration),and finding type usages (Edit > Find > Find Usages).
  • Viewing all current source code problems(View > Tool Windows > Dart Analysis).Any analysis issues are shown in the Dart Analysis pane:

Running and debugging

Note: You can debug your app in a few ways.

  • Using DevTools, a suite of debugging and profilingtools that run in a browserand include the Flutter inspector.DevTools replaces the previous browser-based profilingtool, Observatory.
  • Using Android Studio’s (or IntelliJ’s) built-in debuggingfeatures, such as the ability to set breakpoints.
  • Using the Flutter inspector, directly available inAndroid Studio and IntelliJ.

The instructions below describe features available in Android Studio and IntelliJ. For information on launching DevTools, see Running DevTools from Android Studio in the DevTools docs.

Running and debugging are controlled from the main toolbar:

Selecting a target

When a Flutter project is open in the IDE, you should see a set ofFlutter-specific buttons on the right-hand side of the toolbar.

Note: If the Run and Debug buttons are disabled, and no targets are listed, Flutter has not been able to discover any connected iOS or Android devices or simulators. You need to connect a device, or start a simulator, to proceed.

  1. Locate the Flutter Target Selector drop-down button.This shows a list of available targets.
  2. Select the target you want your app to be started on.When you connect devices, or start simulators,additional entries appear.

Note: If you want to try running your app on the web, but the Chrome (web) target doesn’t appear in the list of targets, make sure you’ve enabled web, as described in Building a web application.

Run app without breakpoints

  1. Click the Play icon in the toolbar, or invoke Run > Run.The bottom Run pane shows logs output.

Run app with breakpoints

  1. If desired, set breakpoints in your source code.
  2. Click the Debug icon in the toolbar, or invoke Run > Debug.
    • The bottom Debugger pane shows Stack Frames and Variables.
    • The bottom Console pane shows detailed logs output.
    • Debugging is based on a default launch configuration.To customize this, click the drop-down button to the rightof the device selector, and select Edit configuration.

Fast edit and refresh development cycle

Flutter offers a best-in-class developer cycle enabling you to see the effectof your changes almost instantly with the Stateful Hot Reload feature.See Hot reload for details.

Show performance data

Note: To examine performance issues in Flutter, see the Timeline view.

To view the performance data, including the widget rebuildinformation, start the app in Debug mode, and then openthe Performance tool window usingView > Tool Windows > Flutter Performance.

To see the stats about which widgets are being rebuilt, and how often,click Show widget rebuild information in the Performance pane.The exact count of the rebuilds for this frame displays in the secondcolumn from the right. For a high number of rebuilds, a yellow spinningcircle displays. The column to the far right shows how many times awidget was rebuilt since entering the current screen.For widgets that aren’t rebuilt, a solid grey circle displays.Otherwise, a grey spinning circle displays.

The app shown in this screenshot has been designed to deliver poor performance, and the rebuild profiler gives you a clue about what is happening in the frame that might cause poor performance. The widget rebuild profiler is not a diagnostic tool, by itself, about poor performance.

The purpose of this feature is to make you aware when widgets arerebuilding—you might not realize that this is happening when justlooking at the code. If widgets are rebuilding that you didn’t expect,it’s probably a sign that you should refactor your code by splittingup large build methods into multiple widgets.

This tool can help you debug at least four common performance issues:

  1. The whole screen (or large pieces of it) are built by a singleStatefulWidget, causing unnecessary UI building. Split up theUI into smaller widgets with smaller build() functions.

  2. Offscreen widgets are being rebuilt. This can happen, for example,when a ListView is nested in a tall Column that extends offscreen.Or when the RepaintBoundary is not set for a list that extendsoffscreen, causing the whole list to be redrawn.

  3. The build() function for an AnimatedBuilder draws a subtree thatdoes not need to be animated, causing unnecessary rebuilds of staticobjects.

  4. An Opacity widget is placed unnecessarily high in the widget tree.Or, an Opacity animation is created by directly manipulating theopacity property of the Opacity widget, causing the widget itselfand its subtree to rebuild.

You can click on a line in the table to navigate to the linein the source where the widget is created. As the code runs,the spinning icons also display in the code pane to help youvisualize which rebuilds are happening.

Note that numerous rebuilds doesn’t necessarily indicate a problem.Typically you should only worry about excessive rebuilds if you havealready run the app in profile mode and verified that the performanceis not what you want.

And remember, the widget rebuild information is only available ina debug build. Test the app’s performance on a real device in a profilebuild, but debug performance issues in a debug build.

Editing tips for Flutter code

If you have additional tips we should share, let us know!

Assists & quick fixes

Assists are code changes related to a certain code identifier.A number of these are available when the cursor is placed on aFlutter widget identifier, as indicated by the yellow lightbulb icon.The assist can be invoked by clicking the lightbulb, or by using thekeyboard shortcut (Alt+Enter on Linux and Windows,Option+Return on macOS), as illustrated here:

Quick Fixes are similar, only they are shown with a piece of code has an errorand they can assist in correcting it. They are indicated with a red lightbulb.

Wrap with new widget assist

This can be used when you have a widget that you want to wrap in a surroundingwidget, for example if you want to wrap a widget in a Row or Column.

Wrap widget list with new widget assist

Similar to the assist above, but for wrapping an existing list ofwidgets rather than an individual widget.

Convert child to children assist

Changes a child argument to a children argument,and wraps the argument value in a list.

Live templates

Live templates can be used to speed up entering typical code structures.They are invoked by typing their prefix, and then selecting it in the codecompletion window:

The Flutter plugin includes the following templates:

  • Prefix stless: Create a new subclass of StatelessWidget.
  • Prefix stful: Create a new subclass of StatefulWidget andits associated State subclass.
  • Prefix stanim: Create a new subclass of StatefulWidget and itsassociated State subclass, including a field initialized with anAnimationController.

You can also define custom templates in Settings > Editor > Live Templates.

Keyboard shortcuts

Hot reload

On Linux (keymap Default for XWin) and Windows the keyboard shortcutsare Controle+Alt+; and Control+Backslash.

Command Line To Generate A New Key Android Studio Software

On macOS (keymap Mac OS X 10.5+ copy) the keyboard shortcuts areCommand+Option and Command+Backslash.

Keyboard mappings can be changed in the IDE Preferences/Settings: SelectKeymap, then enter flutter into the search box in the upper right corner.Right click the binding you want to change and Add Keyboard Shortcut.

Hot reload vs. hot restart

Hot reload works by injecting updated source code files into the runningDart VM (Virtual Machine). This includes not only adding new classes,but also adding methods and fields to existing classes,and changing existing functions.A few types of code changes cannot be hot reloaded though:

Command Line To Generate A New Key Android Studio Free

  • Global variable initializers
  • Static field initializers
  • The main() method of the app

For these changes you can fully restart your application,without having to end your debugging session. To perform a hot restart,don’t click the Stop button, simply re-click the Run button (if in a runsession) or Debug button (if in a debug session), or shift-click the ‘hotreload’ button.

Editing Android code in Android Studio with full IDE support

Opening the root directory of a Flutter project doesn’t expose all the Androidfiles to the IDE. Flutter apps contain a subdirectory named android. If youopen this subdirectory as its own separate project in Android Studio, the IDEwill be able to fully support editing and refactoring all Android files (likeGradle scripts).

If you already have the entire project opened as a Flutter app in AndroidStudio, there are two equivalent ways to open the Android files on their ownfor editing in the IDE. Before trying this, make sure that you’re on the latestversion of Android Studio and the Flutter plugins.

  • In the “project view”, you should see a subdirectory immediately underthe root of your flutter app named android. Right click on it,then select Flutter > Open Android module in Android Studio.
  • OR, you can open any of the files under the android subdirectory forediting. You should then see a “Flutter commands” banner at the top of theeditor with a link labeled Open for Editing in Android Studio.Click that link.

For both options, Android Studio gives you the option to use separate windows orto replace the existing window with the new project when opening a secondproject. Either option is fine.

Line

If you don’t already have the Flutter project opened in Android studio,you can open the Android files as their own project from the start:

  1. Click Open an existing Android Studio Project on the Welcomesplash screen, or File > Open if Android Studio is already open.
  2. Open the android subdirectory immediately under the flutter app root.For example if the project is called flutter_app,open flutter_app/android.

If you haven’t run your Flutter app yet, you might see Android Studio report abuild error when you open the android project. Run flutter pub get inthe app’s root directory and rebuild the project by selecting Build > Maketo fix it.

Editing Android code in IntelliJ IDEA

To enable editing of Android code in IntelliJ IDEA, you need to configure thelocation of the Android SDK:

  1. In Preferences > Plugins, enable Android Support if youhaven’t already.
  2. Right-click the android folder in the Project view, and select OpenModule Settings.
  3. In the Sources tab, locate the Language level field, andselect level 8 or later.
  4. In the Dependencies tab, locate the Module SDK field,and select an Android SDK. If no SDK is listed, click Newand specify the location of the Android SDK.Make sure to select an Android SDK matching the one used byFlutter (as reported by flutter doctor).
  5. Click OK.

Command Line To Generate A New Key Android Studio Free

Tips and tricks

Troubleshooting

Known issues and feedback

Command Line To Generate A New Key Android Studio System

Important known issues that might impact your experience are documentedin the Flutter plugin README file.

All known bugs are tracked in the issue trackers:

  • Flutter plugin: GitHub issue tracker
  • Dart plugin: JetBrains YouTrack

Command Line To Generate A New Key Android Studio Windows 10

We welcome feedback, both on bugs/issues and feature requests.Prior to filing new issues:

  • Do a quick search in the issue trackers to see if the issue is alreadytracked.
  • Make sure you have updated to the most recent version of theplugin.

When filing new issues, include the output of flutter doctor.

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