Android USB转ttl串口

讲到USB转串口，大都是用的USB->ttl模块，我手里这个是USB CH340的一个usb转串口模块,具体长什么样子可以百度搜一下，这种串口的实现方式和谷歌提供的那种串口解决方式不通，这种是通过USB传输数据的，实现起来比较简单一些，下面来看一下方法：

1、需要用到的jar包 CH34xUARTDriver.jar

链接：https://pan.baidu.com/s/14QHOf_-4jK03u687lCRWIw
提取码：yjhk
2、AndroidManifest.xml配置USB权限

<uses-feature android:name="android.hardware.usb.host" />

3、在当前的activity下添加

            <intent-filter><action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" /></intent-filter><intent-filter><action android:name="android.media.action.IMAGE_CAPTURE"/><category android:name="android.intent.category.DEFAULT"/></intent-filter><meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"android:resource="@xml/device_filter" />

4、在Application 里实现一个静态的CH34xUARTDriver 对象

public class MyApp extends Application {public static CH34xUARTDriver driver;
}

5、在activity内实现串口读写开关

public class MainActivity extends Activity {private static final String ACTION_USB_PERMISSION = "cn.wch.wchusbdriver.USB_PERMISSION";private EditText readText;private boolean isOpen;private Handler handler;private int retval;private MainActivity activity;public byte[] writeBuffer;public byte[] readBuffer;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);MyApp.driver = new CH34xUARTDriver((UsbManager) getSystemService(Context.USB_SERVICE), this,ACTION_USB_PERMISSION);initUI();//判断系统是否支持USB HOSTif (!MyApp.driver.UsbFeatureSupported()) {Dialog dialog = new AlertDialog.Builder(MainActivity.this).setTitle("提示").setMessage("您的设备不支持USBhost").setPositiveButton("确认",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface arg0,int arg1) {System.exit(0);}}).create();dialog.setCanceledOnTouchOutside(false);dialog.show();}getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//保持屏幕常亮状态writeBuffer = new byte[512];readBuffer = new byte[512];isOpen = false;activity = this;//打开流程主要步骤为ResumeUsbList，UartInitopenButton.setOnClickListener(new openButton());openButton.post(new Runnable() {@Overridepublic void run() {openButton.performClick();}});handler = new Handler() {public void handleMessage(Message msg) {String str = msg.obj.toString();//设备回来的数据String s0 = str.substring(0, 8);if(s0.equals("01 03 09")){//String s1 = str.substring(9,23); /**卡号*/String s2 = str.substring(24,35);/**余额*/int i = Integer.valueOf(s2.replaceAll(" ",""),16);//转换成分String s = String.valueOf(i/100);                 //转换成元synthesizer.showVideo("您的卡上余额为:"+s+"元");}readText.append((String) msg.obj);}};}class WriteButton implements View.OnClickListener{@Overridepublic void onClick(View v) {byte[] to_send = toByteArray(writeText.getText().toString());int retval = MyApp.driver.WriteData(to_send, to_send.length);//写数据，第一个参数为需要发送的字节数组，第二个参数为需要发送的字节长度，返回实际发送的字节长度if (retval < 0){Toast.makeText(MainActivity.this, "写失败",Toast.LENGTH_SHORT).show();}else {writeBtn.setOnClickListener(new WriteBtn());writeBtn.post(new Runnable() {@Overridepublic void run() {writeBtn.performClick();}});}}}class WriteBtn implements View.OnClickListener{@Overridepublic void onClick(View v) {byte[] to_send = toByteArray(write.getText().toString());int retval = MyApp.driver.WriteData(to_send, to_send.length);//写数据，第一个参数为需要发送的字节数组，第二个参数为需要发送的字节长度，返回实际发送的字节长度if (retval < 0) {Toast.makeText(MainActivity.this, "写失败",Toast.LENGTH_SHORT).show();}}}class setButton implements View.OnClickListener{@Overridepublic void onClick(View v) {if (MyApp.driver.SetConfig((byte)9600, (byte)8, (byte)1, (byte)0,(byte)0)) {//配置串口波特率，函数说明可参照编程手册Toast.makeText(MainActivity.this, "串口设置成功",Toast.LENGTH_SHORT).show();//01      05     00  00       FF  00        8c  3a//01      06     00  00       00  64             88  21/*byte[] send = toByteArray(write.getText().toString());MyApp.driver.WriteData(send, send.length);*/writeButton.setOnClickListener(new WriteButton());writeButton.post(new Runnable() {@Overridepublic void run() {writeButton.performClick();}});} else {Toast.makeText(MainActivity.this, "串口设置失败",Toast.LENGTH_SHORT).show();}}}class openButton implements View.OnClickListener{@Overridepublic void onClick(View v) {if (!isOpen) {retval = MyApp.driver.ResumeUsbList();if (retval == -1) {// ResumeUsbList方法用于枚举CH34X设备以及打开相关设备Toast.makeText(MainActivity.this, "打开设备失败",Toast.LENGTH_SHORT).show();MyApp.driver.CloseDevice();} else if (retval == 0){if (!MyApp.driver.UartInit()) {//对串口设备进行初始化操作Toast.makeText(MainActivity.this, "设备初始化失败",Toast.LENGTH_SHORT).show();Toast.makeText(MainActivity.this, "打开" +"设备失败",Toast.LENGTH_SHORT).show();return;}Toast.makeText(MainActivity.this, "打开设备成功",Toast.LENGTH_SHORT).show();isOpen = true;openButton.setText("关闭");configButton.setEnabled(true);writeButton.setEnabled(true);new readThread().start();//开启读线程读取串口接收的数据configButton.setOnClickListener(new setButton());configButton.post(new Runnable() {@Overridepublic void run() {configButton.performClick();}});} else {AlertDialog.Builder builder = new AlertDialog.Builder(activity);builder.setIcon(R.drawable.icon);builder.setTitle("未授权限");builder.setMessage("确认退出吗？");builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {System.exit(0);}});builder.setNegativeButton("返回", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {}});builder.show();}} else {MyApp.driver.CloseDevice();openButton.setText("打开");configButton.setEnabled(false);writeButton.setEnabled(false);isOpen = false;}}}/** 读取设备数据* */private class readThread extends Thread {public void run() {byte[] buffer = new byte[4096];while (true) {Message msg = Message.obtain();if (!isOpen) {break;}int length = MyApp.driver.ReadData(buffer, 4096);if (length > 0) {String recv = toHexString(buffer, length);msg.obj = recv;handler.sendMessage(msg);}}}}/*** 将byte[]数组转化为String类型* @param arg*            需要转换的byte[]数组* @param length*            需要转换的数组长度* @return 转换后的String队形*/private String toHexString(byte[] arg, int length) {String result = new String();if (arg != null) {for (int i = 0; i < length; i++) {result = result+ (Integer.toHexString(arg[i] < 0 ? arg[i] + 256 : arg[i]).length() == 1 ? "0"+ Integer.toHexString(arg[i] < 0 ? arg[i] + 256: arg[i]): Integer.toHexString(arg[i] < 0 ? arg[i] + 256: arg[i])) + " ";}return result;}return "";}/*** 将String转化为byte[]数组* @param arg*            需要转换的String对象* @return 转换后的byte[]数组*/private byte[] toByteArray(String arg) {if (arg != null) {char[] NewArray = new char[1000];char[] array = arg.toCharArray();int length = 0;for (int i = 0; i < array.length; i++) {if (array[i] != ' ') {NewArray[length] = array[i];length++;}}int EvenLength = (length % 2 == 0) ? length : length + 1;if (EvenLength != 0) {int[] data = new int[EvenLength];data[EvenLength - 1] = 0;for (int i = 0; i < length; i++) {if (NewArray[i] >= '0' && NewArray[i] <= '9') {data[i] = NewArray[i] - '0';} else if (NewArray[i] >= 'a' && NewArray[i] <= 'f') {data[i] = NewArray[i] - 'a' + 10;} else if (NewArray[i] >= 'A' && NewArray[i] <= 'F') {data[i] = NewArray[i] - 'A' + 10;}}byte[] byteArray = new byte[EvenLength / 2];for (int i = 0; i < EvenLength / 2; i++) {byteArray[i] = (byte) (data[i * 2] * 16 + data[i * 2 + 1]);}return byteArray;}}return new byte[] {};}/*** 将String转化为byte[]数组* @param arg*            需要转换的String对象* @return 转换后的byte[]数组*/private byte[] toByteArray2(String arg) {if (arg != null) {char[] NewArray = new char[1000];char[] array = arg.toCharArray();int length = 0;for (int i = 0; i < array.length; i++) {if (array[i] != ' ') {NewArray[length] = array[i];length++;}}NewArray[length] = 0x0D;NewArray[length + 1] = 0x0A;length += 2;byte[] byteArray = new byte[length];for (int i = 0; i < length; i++) {byteArray[i] = (byte)NewArray[i];}return byteArray;}return new byte[] {};}
}

<?xml version="1.0" encoding="UTF-8"?>
<resource><usb-device product-id="29987" vendor-id="6790" /><usb-device product-id="21795" vendor-id="6790" /><usb-device product-id="21778" vendor-id="6790" />
</resource>

另外再提供一个github上面开源的一个开源库：

https://github.com/mik3y/usb-serial-for-android

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