Call Simulator – Personal Android App

A simple, personal full-screen phone call simulator for Android.
Simulate realistic incoming and outgoing calls with caller ID, ringtone, vibration, and an in-call UI.

For personal use only on your own device.

Features

• Incoming call screen

  • Full-screen UI that can appear over the lock screen
  • Custom caller name & number
  • Default system ringtone + vibration pattern
  • Answer / Decline buttons
  • High-priority notification with full-screen intent

• In-call screen

  • Call duration timer
  • Mute / Speaker / Keypad controls (UI only)
  • End call button

• Outgoing call simulation

  • “Calling…” status then transitions to timer

• Main setup screen

  • Edit caller name and phone number before starting a simulation

Requirements

• Android Studio Ladybug | 2024.2.1 or newer (or any recent version supporting AGP 8.7+)
• JDK 17
• Android device or emulator running API 26+ (Android 8.0)

How to open & run

1. Unzip / copy the CallSimulator folder.
2. Open Android Studio → File → Open → select the CallSimulator directory.
3. Let Gradle sync (it will download dependencies automatically).
4. Connect a device or start an emulator.
5. Click Run (green play button).

First-run permissions

• On Android 13+ the app will request Notifications permission.
• For the best full-screen experience when the phone is locked:
  • Go to Settings → Apps → Call Simulator → Notifications and ensure the channel is allowed.
  • On some OEMs you may also need to allow Display over other apps or Full screen notifications.

Project structure

CallSimulator/
├── app/
│   ├── build.gradle.kts          # App-level dependencies & config
│   ├── proguard-rules.pro
│   └── src/main/
│       ├── AndroidManifest.xml
│       ├── java/com/example/callsimulator/
│       │   ├── MainActivity.kt
│       │   ├── IncomingCallActivity.kt
│       │   ├── InCallActivity.kt
│       │   └── CallSimulationService.kt
│       └── res/
│           ├── layout/
│           ├── drawable/
│           ├── values/
│           └── mipmap-*/
├── build.gradle.kts              # Project-level plugins
├── settings.gradle.kts
├── gradle.properties
└── gradle/wrapper/

Dependencies (already declared)

• AndroidX Core KTX
• AppCompat
• Material Components 1.12
• ConstraintLayout
• Activity KTX
• Lifecycle Runtime KTX

Target SDK 35, min SDK 26, Kotlin 2.0.21, AGP 8.7.2.

Customization ideas

• Replace the person avatar with a photo from the gallery.
• Add a list of saved contacts.
• Schedule a simulated call for a future time (AlarmManager / WorkManager).
• Change colors in res/values/colors.xml.

Notes

• This app does not make real phone calls or use the telephony stack.
• It only simulates the visual/audio experience of an incoming/outgoing call.
• Ringtone uses the device’s default ringtone via RingtoneManager.
• The foreground service is used solely to deliver a high-priority call-style notification with a full-screen intent.

Enjoy testing your call UI!