树莓派3B上运行Android程序(3) - 控制LED闪烁

树莓派3B上运行AndroidThings程序(1) - HelloWorld

https://blog.csdn.net/arno1988/article/details/86629345

树莓派3B上运行AndroidThings程序(2) - 与普通android程序区别

https://blog.csdn.net/arno1988/article/details/86630422

树莓派3B上运行AndroidThings程序(3) - 控制LED闪烁

https://blog.csdn.net/arno1988/article/details/86636269

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接线图（BCM14->树莓派第8脚位）

引脚对照图

https://developer.android.google.cn/things/hardware/raspberrypi#io-pinout

Android代码

添加权限

<uses-permission android:name="com.google.android.things.permission.USE_PERIPHERAL_IO"/>

完整代码

package com.android.led;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;

import com.google.android.things.pio.Gpio;
import com.google.android.things.pio.PeripheralManager;

import java.io.IOException;

public class MainActivity extends Activity {
    Gpio gpio = null;
    boolean ledState = false;
    Handler handler = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        try {
            gpio = PeripheralManager.getInstance().openGpio("BCM14");// 树莓派第8脚位
            if (gpio != null) {
                gpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW);// 设置gpio为输出的设备，并且指定初始值为低电压
                handler.post(runnable);// 开始循环
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        handler.removeCallbacks(runnable);// 停止循环
        try { gpio.close(); } catch (IOException e) { e.printStackTrace(); }
    }

    Runnable runnable = new Runnable() {
        @Override
        public void run() {
            // 闪烁
            try {
                ledState = !ledState;
                gpio.setValue(ledState);
                handler.postDelayed(this,1000);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    };

}