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Building Voice AI Android Apps

Build a voice interaction pipeline with speech recognition, language models, speech synthesis, turn-taking and interruption handling.

Intermediate to AdvancedSelf-paced7 modules13 available lessons

Your path, one skill at a time.

Build a voice interaction pipeline with speech recognition, language models, speech synthesis, turn-taking and interruption handling. Follow six teaching modules, each with a practical assignment, then combine the skills in the final project. Start with the introduction even if the tools are familiar: it defines the scope and boundaries of the path.

Self-paced. Complete each exercise and use its checkpoint before moving to the next module. Revisit any prerequisite you cannot yet demonstrate.

What you’ll learn

  • Display when the microphone is active
  • Measure capture-to-first-audio latency by pipeline stage
  • Stop stale speech on interruption and release audio resources

THE CURRICULUM

Build your knowledge, step by step.

13 lessons across 7 modules. Open a module to explore its lessons and practical work.

01MODULE 01What a voice AI pipeline contains2 lessons · Self-paced
  • STT, model and TTS
  • Pipeline versus realtime
  • Task boundaries

Understand the responsibilities behind a spoken conversation.

  1. 01What a voice AI pipeline containsLesson · Self-paced
  2. 02Practice: What a voice AI pipeline containsLab · Self-paced

Ready to move on when: You can name each latency and correctness boundary.

02MODULE 02Capturing speech and detecting turns2 lessons · Self-paced
  • Microphone access
  • Push-to-talk and VAD
  • Audio format

Collect intentional input and preserve user control.

  1. 01Capturing speech and detecting turnsLesson · Self-paced
  2. 02Practice: Capturing speech and detecting turnsLab · Self-paced

Ready to move on when: The user can always tell whether the app is recording.

03MODULE 03Transcription and language understanding2 lessons · Self-paced
  • Interim transcripts
  • Names and numbers
  • Intent validation

Keep uncertain speech separate from confirmed intent.

  1. 01Transcription and language understandingLesson · Self-paced
  2. 02Practice: Transcription and language understandingLab · Self-paced

Ready to move on when: An interim transcript cannot trigger a permanent action.

04MODULE 04Speech synthesis and playback2 lessons · Self-paced
  • Chunking text
  • Playback ownership
  • Content filtering

Deliver understandable audio without losing application state.

  1. 01Speech synthesis and playbackLesson · Self-paced
  2. 02Practice: Speech synthesis and playbackLab · Self-paced

Ready to move on when: Text and audio represent the same approved user-facing response.

05MODULE 05Interruptions and conversation state2 lessons · Self-paced
  • Barge-in
  • Turn identity
  • Conversation repair

Handle overlapping speech without mixing turns.

  1. 01Interruptions and conversation stateLesson · Self-paced
  2. 02Practice: Interruptions and conversation stateLab · Self-paced

Ready to move on when: No output from a superseded turn can re-enter active playback.

06MODULE 06Latency, accessibility and reliability2 lessons · Self-paced
  • Latency breakdown
  • Accessible alternatives
  • Reliability matrix

Evaluate the entire voice experience under realistic conditions.

  1. 01Latency, accessibility and reliabilityLesson · Self-paced
  2. 02Practice: Latency, accessibility and reliabilityLab · Self-paced

Ready to move on when: Your voice feature remains usable when speech input or output is unavailable.

07MODULE 07Capstone and portfolio review1 lessons · Self-paced
  • Display when the microphone is active
  • Measure capture-to-first-audio latency by pipeline stage
  • Stop stale speech on interruption and release audio resources

Build a voice note assistant with push-to-talk, transcript correction, interruptible playback and a text-only fallback.

  1. 01Capstone: Building Voice AI Android AppsProject · Self-paced

Ready to move on when: Demonstrate every acceptance criterion and explain the tradeoffs without relying on the lesson text.

PROVE YOUR SKILLS

A portfolio you can build, explain, and defend.

  • Display when the microphone is active
  • Measure capture-to-first-audio latency by pipeline stage
  • Stop stale speech on interruption and release audio resources

Use the final review rubric to identify gaps. Lesson completion tracks study progress; readiness comes from independently demonstrating the work.

Open the portfolio review rubric →