android-pdf-export（android PDF 导出）

Platform Notes

• Optional helper plugins may help in some environments, but they must not be treated as required for this skill.

Android PDF Export (Native PdfDocument)

Acknowledgement: Shared by Peter Bamuhigire, techguypeter.com, +256 784 464178.

Use When

• Native Android PDF export system using PdfDocument API (zero dependencies). Reusable Canvas-based generator with branded letterheads, data tables, summary cards, and share-via-Intent. Use when adding PDF export to any Android app screen —...
• The task needs reusable judgment, domain constraints, or a proven workflow rather than ad hoc advice.

Do Not Use When

• The task is unrelated to android-pdf-export or would be better handled by a more specific companion skill.
• The request only needs a trivial answer and none of this skill's constraints or references materially help.

Required Inputs

• Gather relevant project context, constraints, and the concrete problem to solve; load references only as needed.
• Confirm the desired deliverable: design, code, review, migration plan, audit, or documentation.

Workflow

• Read this SKILL.md first, then load only the referenced deep-dive files that are necessary for the task.
• Apply the ordered guidance, checklists, and decision rules in this skill instead of cherry-picking isolated snippets.
• Produce the deliverable with assumptions, risks, and follow-up work made explicit when they matter.

Quality Standards

• Keep outputs execution-oriented, concise, and aligned with the repository's baseline engineering standards.
• Preserve compatibility with existing project conventions unless the skill explicitly requires a stronger standard.
• Prefer deterministic, reviewable steps over vague advice or tool-specific magic.

Anti-Patterns

• Treating examples as copy-paste truth without checking fit, constraints, or failure modes.
• Loading every reference file by default instead of using progressive disclosure.

Outputs

• A concrete result that fits the task: implementation guidance, review findings, architecture decisions, templates, or generated artifacts.
• Clear assumptions, tradeoffs, or unresolved gaps when the task cannot be completed from available context alone.
• References used, companion skills, or follow-up actions when they materially improve execution.

Evidence Produced

References

• Use the references/ directory for deep detail after reading the core workflow below.

Generate professional branded PDF documents from any Android screen using the built-in android.graphics.pdf.PdfDocument API. Zero external dependencies — pure Canvas drawing. Supports A4 portrait/landscape, multi-page pagination, letterheads, tables, summary cards, info sections, status badges, and charts.

Overview

Library choice: Native android.graphics.pdf.PdfDocument (0 KB added to APK). Alternatives like iText (AGPL license), PDFBox-Android (stale since 2023), and OpenPDF (requires java.awt hack) were rejected.

Architecture: A core DmsPdfGenerator object provides reusable drawing primitives. Per-module exporters (Sales, Inventory, Network) compose these primitives for each screen. PdfExportHelper handles file I/O and sharing via FileProvider.

core/pdf/
  DmsPdfGenerator.kt         — Reusable drawing primitives (letterhead, tables, cards, footer)
  PdfExportHelper.kt          — Save to cache + share via FileProvider Intent

core/ui/components/
  PdfExportButton.kt          — Reusable TopAppBar button (icon + "PDF" label)

Per-module exporters (one object per feature module):
  SalesReportPdfExporter.kt   — Sales reports + invoice list
  InventoryPdfExporter.kt     — Stock levels, PO/transfer/adjustment details + lists
  NetworkPdfExporter.kt       — Distributor list/detail, genealogy

Additional Guidance

Extended guidance for android-pdf-export was moved to references/skill-deep-dive.md to keep this entrypoint compact and fast to load.

Use that deep dive for:

• Dependencies
• Step 1: FileProvider Setup
• Step 2: PdfExportHelper
• Step 3: Core PDF Generator
• Step 4: Per-Module Exporters
• Step 5: PdfExportButton Component
• Step 6: Screen Integration
• Step 7: String Resources
• Step 8: Franchise Info for Letterheads
• PDF Design Specification