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What are Flutter DevTools?
Why do Flutter developers need DevTools?
What are the different DevTools features?
How to install DevTools in Android Studio?
How to install DevTools in VS Code?
What are some advanced DevTools features?
Have you ever imagined a life without Dev tools, how will you solve the productivity and quality issues in your app development? The Flutter team understands this, and thus it brings the best DevTools to the Flutter ecosystem.
In this article, we will discuss the Flutter DevTools and their function, but before that let's take a movement to understand why we need Flutter Dev Tool to build quality apps efficiently.
DevTools are needed for efficiency and effective app development. They are used to perform several operations more accurately in a minimum time. It is a complete tooling suite for Flutter and Dart developers that simplifies the following tasks:
Now let’s take a detailed look at Flutter DevTools.
Flutter Dev Tool is a suite of integrated tools within the Flutter development environment. It provides various functionalities to assist developers in building beautiful and high-performance Flutter UIs. Imagine a toolbox specifically designed to make your Flutter development life easier.
That's essentially what Flutter DevTools is. It's a collection of built-in tools that empower you to inspect, analyze, debug, and optimize your app resource utilization. So, let's understand it in detail.
The Flutter Widget Inspector is a powerful tool for visualizing and exploring Flutter widget trees and is also used for understanding existing layouts and diagnosing layout issues.
Also, the Flutter inspector makes it easy to inspect the state of running the Flutter application by understanding the structure of a widget tree.
It offers timing and performance information for activity in the Flutter app. The Performance view consists of the following three parts:
The CPU Profiler view allows Flutter users to record and profile a session from a Dart or Flutter app. The CPU Profiler pulls the profiling data from the VM and displays it in the profiler view.
It lets you peek at how an isolate is using memory at a given time. Memory profiling in DevTools consists of the following main functions.
Allows you to record network traffic, and see details like general and timing information about the network request as well as the response content along with the request headers and bodies.
DevTool Debugger, supports breakpoints, stepping, and variable inspections. With the tool, you can see the source for the main entry point for the Flutter app loaded in the debugger and browse most of your application sources.
It displays events from the Dart runtime, application frameworks, and application-level logging events.
The tool allows you to analyze the application's total size and helps you compare the size information of the app.
Follow the steps below to install DevTools in your Android Studio:
If you haven’t already installed the Flutter plugin Install it. This can be done using the normal Plugin page in the IntelliJ and Android Studio settings. Once the setting->plug-ins page is open you can search for the Flutter in the marketplace to install it.
To open DevTools, run a Flutter application. This can be achieved by opening your Flutter project, ensuring that your device is connected, and clicking the Run or Debug button.
Next launch DevTools from the toolbar/menu in the Flutter project. Once the app is running, you can start DevTools using one of the following instructions.
You can install the DevTool also from VS code, let's find out how to install DevTools from VS code.
Follow the steps below to install DevTool from the VS Code
To use the DevTool from VS Code, install the Dart extension, further, you need to install the Flutter extension for debugging the Flutter app.
Next, you need to launch the Flutter application for debugging your app. Click Run > statrtDebugging to start debugging the app.
Once debugging is started, Darts opens the DevTools command in the VS Code command palette. When you open the app first time, you will be prompted to activate or upgrade DevTools.
Imagine a tree structure where the root represents the main function of your app, and branches represent functions called from the root. The thickness of each branch indicates how much CPU time is spent in that function. This is essentially a Flame Chart.
Benefits:
Identify bottlenecks: Flame Charts visually highlight functions that consume the most CPU time. This helps pinpoint areas for optimization.
Understand function hierarchy: You can see how functions call each other, helping you understand the overall program flow and identify potential inefficiencies.
The Memory Timeline is a graph that tracks memory allocations over time. It shows how memory usage changes as your app runs, allowing you to identify potential memory leaks.
Benefits:
Detects memory leaks: A sharp increase in memory usage over time might indicate a memory leak. The timeline helps visualize this pattern.
Track memory allocations: You can see how memory allocations change with specific events in your app, helping you understand memory usage patterns.
The Logging view displays logs generated by your Dart code and Flutter framework. However, it can get overwhelming with numerous logs. Filtering helps you focus on specific events.
Benefits:
Isolate issues: By filtering logs based on severity level (e.g., error, warning) or custom tags, you can quickly identify relevant information related to a specific issue.
Reduce noise: Filtering out irrelevant logs improves clarity and allows you to focus on debugging specific problems.
Let's say your app has UI elements overlapping unexpectedly. You can use the UI inspector to:
Inspect widget properties: Select the widgets causing the overlap and inspect their properties like padding, margin, and constraints. This helps identify if any property is set incorrectly.
Highlight widget layouts: The inspector can visually highlight the layout boundaries of each widget. This helps visualize how widgets are positioned within their parent containers.
If your app feels sluggish, use the Performance view:
Analyze frame charts: Frame charts show the time taken to render each frame. Look for spikes that indicate a single frame taking too long.
Examine timeline events: The timeline provides a detailed breakdown of events happening during a frame render. Identify events taking a significant amount of time to pinpoint the bottleneck.
Memory leaks occur when your app allocates memory but doesn't release it when it's no longer needed. Use the Memory Profiler:
In this article, you have learned about the Flutter DevTools, why Flutter developers need them, how to install DevTools with Android Studio and VS Code, advanced features, and about using DevTools to debug specific issues.
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