AndroidThings应用程序学习笔记

如何关闭GPIO

    onDestroy(...) {
        if (mLedGpio != null) {
            try {
                mLedGpio.close();
            } catch (IOException e) {
                Log.e(TAG, "Error closing LED GPIO", e);
            } finally {
                mLedGpio = null;
            }
            mLedGpio = null;//貌似与finally重复了
        }
    }

如何打开GPIO管脚

    private Gpio mLedGpio;
    private ButtonInputDriver mButtonInputDriver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "Hello Android Things!");
        Log.i(TAG, "Starting ButtonActivity");

        PeripheralManagerService pioService = new PeripheralManagerService();
        try {
            Log.i(TAG, "Configuring GPIO pins");
            mLedGpio = pioService.openGpio(BoardDefaults.getGPIOForLED());
            mLedGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW);
//...