Android 检测外接USB设备、读取GPIO节点

一.检测外接USB设备、读取GPIO节点

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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

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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

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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

2.3.使用handler

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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;
    }
}

　　

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