XHLP 1.0 : Android XML Layout Preview Engine

A comprehensive, client-side rendering engine designed to parse, calculate, and visualize Android XML layouts within a web-based environment. This system replicates key portions of the Android UI framework, including the complex measurement and layout passes required for ConstraintLayout and MotionLayout.

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Overview

This plugin based on XHLP 1.0 that's Android Xml previewer & All features of Android Builder is Available in this plugin with more customization.

⚠️ Note: This is currently a Experiment Version. You might encounter some bugs or stability issues as we continue to improve the core engine.

✅ Future Target Edit XML from UI

✅ Installation After installation , go to setting of this plugin and export plugin.zip after exporting install in Fdroid version of Acode (For Apk/Abb) build purpuse

✅ XHLP Engine : This doesn't require any setup , go to direct android folder search for .xml (eg: activity_main.xml) and preview

❌ Uninstall Uninstall Android Builder plugin Before installing this plugin

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Preview sample

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❓ Features

0. XHLP 1.0 Engine Live Android Xml preview
1. Enhanced Android Builder and it's features with customization

🤔 How to Use XHLP Or Preview XML

0. Open Android Project
1. Choose xml file like activity_main.xml
2. Click on Top Icon
3. After once preview just switch Xml file -> Preview Tab insted of clicking icon
4. ⚠️ Again repeating : Once you open preview don't close that tab [switch .xml & then open preview tab] , if you close then you have to restart Acode for load engine again Otherwise some features may not work properly

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System Overview

This engine operates by parsing raw Android XML resources and converting them into a DOM structure styled dynamically via JavaScript. It features a custom-built constraint solver, a resource resolution system for handling Android-specific references, and a dual-mode rendering pipeline (Design and Blueprint).

Core Capabilities

• XML Parsing & DOM Construction: Converts Android XML hierarchies into web-compatible DOM elements while maintaining attribute integrity.

• Resource Resolution: Resolves Android resource references including @string, @color, @dimen, and @style. It supports basic theme attribute resolution (?attr).

• Drawable Rendering: Support for complex Android drawables, including:

• VectorDrawable (XML to SVG conversion)

• ShapeDrawable (Gradients, corners, strokes)

• StateListDrawable (Selector logic)

• Density Conversion: Automatic pixel-to-dp conversion based on configurable device density buckets (mdpi, hdpi, xhdpi, etc.).

Layout Systems

The engine implements distinct logic for measuring and positioning views based on their parent layout type:

• ConstraintLayout System: A fully implemented algebraic solver that supports:

• Relative positioning (Start/End, Top/Bottom).

• Chains (Spread, Packed, Spread Inside).

• Guidelines (Vertical/Horizontal, Percent/Dimension).

• Barriers (Dynamic referencing).

• Bias settings and Dimension ratios.

• Circular positioning.

• Linear & Relative Systems: Logic for weight distribution in linear containers and dependency graph resolution for relative positioning.

• MotionLayout Support: Parses MotionScene files to handle state transitions and constraint sets, enabling animation previews.

Widget Support

The engine includes a library of renderers for standard Android UI components, ensuring accurate visual representation of attributes:

• Basic Inputs & Controls: Full support for TextView, Button, EditText, CheckBox, Switch, SeekBar, and ProgressBar.
• Media & Graphics: Rendering logic for ImageView (supporting various scale types) and ShapeDrawable backgrounds.
• Complex Containers: Implementation of ScrollView, HorizontalScrollView, CardView, and NavigationView.
• Collections: Visual placeholders for RecyclerView to assist in list layout design.
• Constraint Helpers: Functional implementation of non-visual helper widgets including Group, Flow, Layer, and Placeholder.

Visual Tooling

• Blueprint Mode: A technical view mode that visualizes the relationship between views. It renders constraint connections, spring/zigzag lines for loose connections, anchor points, and chain linkages using a dedicated SVG overlay layer.
• Attribute Inspector: A sidebar interface for inspecting selected view properties, layout parameters, and active constraints.
• Constraint Widget: A visual representation of margins, bias, and view dimensions (wrap_content, match_parent, 0dp) for the selected element.
• Logcat UI: An integrated logging interface to display parsing errors, missing resources, and system warnings.

Architecture

The project is structured into modular components to ensure separation of concerns:

• Solvers: Contains the mathematical logic for calculating view positions. This includes specialized calculators for flow, chains, and dimension estimation.
• Parsers: Responsible for reading raw XML content (Manifests, Layouts, Styles, Motion Scenes) and converting them into usable JavaScript objects.
• Renderers: Handles the drawing logic. This is split into core view rendering and blueprint/overlay rendering.
• Resolvers: Manages the linking of resources and attributes to the views.
• UI Controls: Manages the toolbar, zoom controls, device frame simulation, and user interaction events.

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Tests & Accuracy

Pass Rate: 95%+ Tested against 300+ complex Android XML layouts, including deeply nested ConstraintLayouts, RTL/LTR combinations, barriers, chains, flows, and edge-case constraint interactions.

Accuracy: 90% – 95% overall Accuracy is measured by comparing computed view geometry

Remember This Engine not Always correct but maximum time perfect preview

Other tests waiting for you ❤️

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Component Support Status

The following metrics represent the current implementation maturity of specific Android components within this engine.

ConstraintLayout		92%
LinearLayout		95%
RelativeLayout		85%
MotionLayout		65%
Vector Drawables		80%
Resource Resolution		75%
Standard Widgets		88%

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Check XHLP engine :

• XHLP 1.0 - Look up it On Github

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License & Beta Access

DATA NOT AVAILABLE

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Contact & Community

At the moment, this plugin is not available as a free version or testing version

Feedback ? Feedback here
Bugs ? Comment bugs
Telegram: Dev. Sou

acode.plugin.androidbuilder