APP
一.檢測外接USB設備、讀取GPIO節點
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();
//對獲取的每行的設備信息進行過濾，獲得自己想要的。
//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.工作線程更新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() {
// 耗時操作略....
// 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("距離傳感器 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("金屬感應傳感器 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/
