Android Boot Animation with NIDEC Spinner

Overview

This project extends Android's native boot animation system by adding a custom NIDEC-themed logo and a loading spinner animation during system boot-up. The modifications are implemented in BootAnimation.cpp, with a focus on the BootAnimation::nidec() function.

The spinner plays smoothly under the "NIDEC - All For Dreams" logo and is optimized to render 60 frames at a steady ~20 FPS (50ms per frame).

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Features

• ✅ Displays NIDEC logo during boot.
• 🔄 Renders a 60-frame loading spinner animation using OpenGL ES.
• 🕒 Frame-timed rendering with systemTime() for smooth transitions.
• 🎯 Accurate frame rate regulation (~20fps) using usleep.
• 💥 Cleans up OpenGL textures on exit.
• 📦 Uses assets like nidec-logo_landscape2.png and spinner_#.png.

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File Structure

/bootanimation
├── images/
│   ├── nidec-logo_landscape2.png
│   └── spinner_1.png to spinner_60.png
├── BootAnimation.cpp
├── BootAnimation.h
└── Android.mk or Android.bp

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Code Highlights

1. Logo & Spinner Initialization

initTexture(&mAndroid[0], mAssets, "images/nidec-logo_landscape2.png");
for (int i = 1; i <= 60; i++) {
    char filePath[128];
    sprintf(filePath, "images/spinner_%d.png", i);
    initTexture(&spinnerFrames[i-1], mAssets, filePath);
}
glBindTexture(GL_TEXTURE_2D, mAndroid[0].name);
glDrawTexiOES(0, 0, 0, mWidth, mHeight);
glBindTexture(GL_TEXTURE_2D, spinnerFrames[currentFrame].name);
glDrawTexiOES(spinnerX, spinnerY, 0, spinnerWidth, spinnerHeight);
currentFrame = (currentFrame + 1) % 60;
nsecs_t sleepNs = FRAME_DURATION_NS - frameElapsed;
if (sleepNs > 0) {
    usleep(ns2us(sleepNs));
}

How to Integrate

1. Replace the default bootanimation.zip with a custom one containing the nidec-logo and spinner images.
2. Update the Android system service that launches the boot animation to call the BootAnimation::nidec() function.
3. Recompile and flash your modified system image.

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Notes

• Ensure all 60 spinner PNG files exist in the correct path inside the boot animation ZIP.
• Tested for landscape resolution, adjust spinnerX and spinnerY for different screen sizes.
• Compatible with OpenGL ES 1.0 (via legacy APIs).

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Author

Sachin.R.Dsilva
SWE-G1 - NIST 📅 January–February 2025