开通会员

纯净搜索，智慧选择；海量资源，尽在掌握。

搜索
当前位置：首页 > IT技术 > 移动平台 > 正文

Android 检测外接USB设备、读取GPIO节点
2021-10-27 14:34:00

一.检测外接USB设备、读取GPIO节点

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import android.app.Activity;
import android.hardware.input.InputManager;
import android.os.Bundle;
import android.util.Log;
import android.view.InputDevice;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		String gpio0 = readNode("/sys/class/xh_custom/xh_custom_gpio/device/gpio0");
		int gpio = Integer.parseInt(gpio0);
		
		
	}
	
    private void detectUsbDeviceWithInputManager() {
        InputManager im = (InputManager) getSystemService(INPUT_SERVICE);
        int[] devices = im.getInputDeviceIds();
        for (int id : devices) {
            InputDevice device = im.getInputDevice(id);
            Log.d("gatsby", "detectUsbDeviceWithInputManager: " + device.getName());
        }
    }
    
    private void detectInputDeviceWithShell() {
        try {
           
            Process p = Runtime.getRuntime().exec("cat /proc/bus/input/devices");
            BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
            String line = null;
            while ((line = in.readLine()) != null) {
                String deviceInfo = line.trim();
                //对获取的每行的设备信息进行过滤，获得自己想要的。
                //if (deviceInfo.contains("Name="))
                    Log.d("gatsby", "detectInputDeviceWithShell: " + deviceInfo);
            }
            Log.d("gatsby", "-----------------------");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private String readNode(String sys_path) {
		try {
			Runtime runtime = Runtime.getRuntime();
			Process process = runtime.exec("cat " + sys_path);
			InputStream is = process.getInputStream();
			InputStreamReader isr = new InputStreamReader(is);
			BufferedReader br = new BufferedReader(isr);
			String line;
			while (null != (line = br.readLine())) {
				//Log.d("gatsby", "readNode data ---> " + line);
				return line;
			}
		} catch (IOException e) {
			e.printStackTrace();
			Log.d("gatsby", "*** ERROR *** Here is what I know: " + e.getMessage());
		}
		return null;
	}
}

1.2.InputManager

10-27 11:38:13.550  2008  2008 D gatsby  : detectUsbDeviceWithInputManager: Virtual
10-27 11:38:13.551  2008  2008 D gatsby  : detectUsbDeviceWithInputManager: rk29-keypad
10-27 11:38:13.552  2008  2008 D gatsby  : detectUsbDeviceWithInputManager: PixArt USB Optical Mouse
10-27 11:38:13.553  2008  2008 D gatsby  : detectUsbDeviceWithInputManager: rockchip_headset
10-27 11:38:13.554  2008  2008 D gatsby  : detectUsbDeviceWithInputManager: ff420030.pwm

1.3.cat /proc/bus/input/devices

I: Bus=0003 Vendor=0d8c Product=0014 Version=0100
N: Name="C-Media Electronics Inc. USB Audio Device"
P: Phys=usb-xhci-hcd.11.auto-1/input3
S: Sysfs=/devices/platform/usb@fe900000/fe900000.dwc3/xhci-hcd.11.auto/usb7/7-1/7-1:1.3/0003:0D8C:0014.0003/input/input5
U: Uniq=
H: Handlers=event4 cpufreq keychord
B: PROP=0
B: EV=13
B: KEY=e000000000000 0
B: MSC=10

 二.工作线程更新UI方法

2.1.布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="horizontal"
    tools:context="com.gatsby.gpiotest.MainActivity" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_weight="2" >

        <TextView
            android:id="@+id/ie802_gpio1_value"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="GPIO1"
            android:textSize="35sp" />

        <Button
            android:id="@+id/ie802_gpio1_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/red"
            android:textSize="35sp" />
    </LinearLayout>
    
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_weight="2">

        <TextView
            android:id="@+id/ie802_gpio2_value"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="GPIO2"
            android:textSize="35sp" />

        <Button
            android:id="@+id/ie802_gpio2_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@drawable/red"
            android:textSize="35sp" />
    </LinearLayout>

</LinearLayout>

2.3.使用handler

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

	TextView text_gpio1,text_gpio2;
	String gpio1_Value,gpio2_Value;
	int gpio1 ,gpio2;
	Button ie802_gpio1_btn,ie802_gpio2_btn;
	
	private Handler mHandler = new Handler() {
		public void handleMessage(Message msg) {
			// 更新UI
			switch (msg.what) {
			case 1:
				gpio1_Value = readNode("/sys/class/xh_custom/xh_custom_gpio/device/gpio1");
				gpio1= Integer.parseInt(gpio1_Value);
				break;
			case 2:
				gpio2_Value = readNode("/sys/class/xh_custom/xh_custom_gpio/device/gpio2");
				gpio2= Integer.parseInt(gpio2_Value);
				break;
			}
		};
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		text_gpio1 = (TextView) findViewById(R.id.ie802_gpio1_value);
		text_gpio2 = (TextView) findViewById(R.id.ie802_gpio2_value);
		ie802_gpio1_btn =(Button)findViewById(R.id.ie802_gpio1_btn);
		ie802_gpio2_btn =(Button)findViewById(R.id.ie802_gpio2_btn);
		Timer timer = new Timer();
		timer.scheduleAtFixedRate(new MyTask(this), 1, 100);

	}

	private class MyTask extends TimerTask {
		private Activity context;

		MyTask(Activity context) {
			this.context = context;
		}

		@Override
		public void run() {
			// 耗时操作略....

			// 更新UI方法 1
			Message message1 = new Message();
			message1.what = 1;
			mHandler.sendMessage(message1);
			Message message2 = new Message();
			message2.what = 2;
			mHandler.sendMessage(message2);
			// 更新UI方法 2
			mHandler.post(updateThread);

			// 更新UI方法 3
			context.runOnUiThread(updateThread);
		}
	}

	Runnable updateThread = new Runnable() {

		@Override
		public void run() {
			text_gpio1.setText("距离传感器 GPIO1 Value ->"+gpio1_Value);
			if(gpio1==0) {
				ie802_gpio1_btn.setBackgroundResource(R.drawable.green);
			}else {
				ie802_gpio1_btn.setBackgroundResource(R.drawable.red);
			}
			text_gpio2.setText("金属感应传感器 GPIO2 Value ->"+gpio2_Value);
			if(gpio2==0) {
				ie802_gpio2_btn.setBackgroundResource(R.drawable.green);
			}else {
				ie802_gpio2_btn.setBackgroundResource(R.drawable.red);
			}
		}

	};

	public static String readNode(String sys_path) {
		try {
			Runtime runtime = Runtime.getRuntime();
			Process process = runtime.exec("cat " + sys_path);
			InputStream is = process.getInputStream();
			InputStreamReader isr = new InputStreamReader(is);
			BufferedReader br = new BufferedReader(isr);
			String line;
			while (null != (line = br.readLine())) {
				//Log.d("gatsby", "readNode data ---> " + line);
				return line;
			}
		} catch (IOException e) {
			e.printStackTrace();
			Log.d("gatsby", "*** ERROR *** Here is what I know: " + e.getMessage());
		}
		return null;
	}
}

　　

本文摘自 ：https://www.cnblogs.com/

推荐内容
IT技术
Web编程 Windows编程 编程语言 数据库 移动平台 系统服务 微信平台 其他技术
科技百科
可穿戴设备 电子工程 电力 智能汽车网 光学 智能硬件 环保 风电 机器人 安防 云计算 物联网 3D打印 传感器 锂电 储能 智能电网 新材料 太阳能光伏 激光 医疗科技 氢能 工控 照明 显示 智慧城市 半导体照明 光通讯 人工智能 新能源汽车 电源 仪器仪表 通信 VR 智能家居