public CarController(MotorHat motorHat, TricolorLed led, AlphanumericDisplay display) {
    mMotorHat = motorHat;
    mLed = led;
    mDisplay = display;

    mHandlerThread = new HandlerThread("CarController-worker");
    mHandlerThread.start();
    mHandler = new Handler(mHandlerThread.getLooper());
}
 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.i(TAG, "Starting SegmentDisplayActivity");

    try {
        mSegmentDisplay = new AlphanumericDisplay(I2C_BUS);
        mSegmentDisplay.setBrightness(1.0f);
        mSegmentDisplay.setEnabled(true);
        mSegmentDisplay.clear();
        mSegmentDisplay.display("ABCD");
    } catch (IOException e) {
        Log.e(TAG, "Error configuring display", e);
    }
}
 

/**
 * Opens display and writes values to it.
 */
@Test
public void testDisplay() throws IOException {
    AlphanumericDisplay display = RainbowHat.openDisplay();
    display.display("TEST");
    display.clear();
    display.close();
}
 

public static AlphanumericDisplay openDisplay() throws IOException {
    return new AlphanumericDisplay(BOARD.getI2cBus());
}