Android Always on Display是通过在系统中实现一个系统服务和一个应用程序来编码的。在服务中，使用sensorManager获取正在使用的传感器类型并根据传感器数据来确定设备是否处于运动状态。然后，在应用程序中使用Canvas和Paint对象来编写触发器。以下是一个简单的实现代码示例：

public class AODTrigger implements SensorEventListener{

    private final static String TAG = "AODTrigger";
    private static SensorManager sensorManager;
    private static Sensor accelerometer;
    public static boolean isDeviceMoving = true;

    public void register(Context context) {
        sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
        accelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);

        if (accelerometer != null) {
            sensorManager.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
        }
    }

    public void unregister() {
        if (sensorManager != null) {
            sensorManager.unregisterListener(this);
        }
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        float x = event.values[0];
        float y = event.values[1];
        float z = event.values[2];

        double accelerationForce = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2));
        if (accelerationForce > 0.8) {
            isDeviceMoving = true;
        } else {
            isDeviceMoving = false;
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
}

public class AODCanvas extends ImageView{

    private static final String TAG = "AODCanvas";

    public AODCanvas(Context context) {
        super(context);
        init();
    }

    public AODCanvas(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public AODCanvas(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint paint = new Paint();
        paint.setTextSize(