安卓APP：利用AndroidStudio开发usb串口通信软件【第2步】
16lz
2021-01-24
工程代码下载地址：
//download.csdn.net/download/mm13420109325/12018905
连线如下：
参考：https://www.cnblogs.com/xqxacm/p/8966430.html
遇到的问题（上面的工程打开报错）的解决方法：
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（未测试）驱动的官方下载地址：http://www.wch.cn/download/CH341SER_ANDROID_ZIP.html
目录结构如下：（将 CH34xUARTDriver.jar 文件放在目录 : app --> libs 文件下，右击它，选择Add Ad Library）
核心源码如下：
MainActivity.java文件
package com.example.usb_to_ttl;import androidx.appcompat.app.AppCompatActivity;import android.content.Context;import android.widget.Toast;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.os.Handler;import android.os.Message;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.hardware.usb.UsbManager;import android.view.WindowManager;import cn.wch.ch34xuartdriver.CH34xUARTDriver;public class MainActivity extends AppCompatActivity implements View.OnClickListener{ private Button connect; //number 0-9 private Button n_0; private Button n_1; private Button n_2; private Button n_3; private Button n_4; private Button n_5; private Button n_6; private Button n_7; private Button n_8; private Button n_9; //other symbol private Button clear_all; private Button equal; boolean clean; private EditText editText_table; private EditText editText_ele; private Context context; private String usbNumber; private static final String ACTION_USB_PERMISSION = "cn.wch.wchusbdriver.USB_PERMISSION"; private boolean isOpen = false; private Handler handler; private int retval; private MainActivity activity; public byte[] writeBuffer; public byte[] readBuffer; public int baudRate; public byte stopBit; public byte dataBit; public byte parity; public byte flowControl; public int totalrecv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //usb-ttl MyApp.driver = new CH34xUARTDriver( (UsbManager) getSystemService(Context.USB_SERVICE), this, ACTION_USB_PERMISSION); baudRate = 9600; stopBit = 1; dataBit = 8; parity = 0; flowControl = 0; if (!MyApp.driver.UsbFeatureSupported())// 判断系统是否支持USB HOST { Dialog dialog = new AlertDialog.Builder(MainActivity.this) .setTitle("提示") .setMessage("您的手机不支持USB HOST，请更换其他手机再试！") .setPositiveButton("确认", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface arg0, int arg1) { System.exit(0); } }).create(); dialog.setCanceledOnTouchOutside(false); dialog.show(); } getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);//keep screen always on writeBuffer = new byte[512]; readBuffer = new byte[512]; isOpen = false; activity = this; connect = findViewById(R.id.button10); //the instantiation of number 0-9 n_0 = findViewById(R.id.button0); n_1 = findViewById(R.id.button1); n_2 = findViewById(R.id.button2); n_3 = findViewById(R.id.button3); n_4 = findViewById(R.id.button4); n_5 = findViewById(R.id.button5); n_6 = findViewById(R.id.button6); n_7 = findViewById(R.id.button7); n_8 = findViewById(R.id.button8); n_9 = findViewById(R.id.button9); //the instantiation of others clear_all = findViewById(R.id.button11); equal = findViewById(R.id.button12); editText_table = findViewById(R.id.editText); editText_ele = findViewById(R.id.editText2); //unable to edit editText_ele.setFocusable(false); editText_ele.setFocusableInTouchMode(false); editText_table.setFocusable(false); editText_table.setFocusableInTouchMode(false); //click n_0.setOnClickListener(this); n_1.setOnClickListener(this); n_2.setOnClickListener(this); n_3.setOnClickListener(this); n_4.setOnClickListener(this); n_5.setOnClickListener(this); n_6.setOnClickListener(this); n_7.setOnClickListener(this); n_8.setOnClickListener(this); n_9.setOnClickListener(this); connect.setOnClickListener(this); // sb = new StringBuilder();//usb clear_all.setOnClickListener(this); equal.setOnClickListener(this); context = this; handler = new Handler() { public void handleMessage(Message msg) { editText_ele.setText((String) msg.obj); } }; } public void onClick(View view){ //get the input String input = editText_table.getText().toString(); //Determine which key is being pressed switch (view.getId()){ case R.id.button0: case R.id.button1: case R.id.button2: case R.id.button3: case R.id.button4: case R.id.button5: case R.id.button6: case R.id.button7: case R.id.button8: case R.id.button9: if(clean){ clean = false; editText_table.setText(""); } editText_table.setText(input+((Button)view).getText()+""); break; //clean case R.id.button11: if(clean){ clean = false; input = ""; editText_table.setText(""); } if(!input.equals("")){ editText_table.setText(input.substring(0,input.length() - 1)); break; } break; case R.id.button12: sendToUSB(); break; case R.id.button10: openUSB(); configUSB(); break; } } 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, buffer.length); if (length > 0) {//String recv = toHexString(buffer, length);//String recv = new String(buffer, 0, length); totalrecv += length;// String content = String.valueOf(totalrecv); String content = new String(buffer); //String content = hexStringToString(toHexString(buffer,length)); //String content = toHexString(buffer,length*2); msg.obj = content+""; handler.sendMessage(msg); } } } } 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 ""; } /* private byte[] toByteArray(String arg) { if (arg != null) { // 1.先去除String中的' '，然后将String转换为char数组 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++; } } // 将char数组中的值转成一个实际的十进制数组 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; } } //将 每个char的值每两个组成一个16进制数据 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[] {}; } */ private byte[] toByteArray2(String arg) { if (arg != null) { /* 1.先去除String中的' '，然后将String转换为char数组 */ 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[] {}; } private void openUSB(){ 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; connect.setText("Close"); new readThread().start();//开启读线程读取串口接收的数据 } else { AlertDialog.Builder builder = new AlertDialog.Builder(activity); builder.setIcon(R.mipmap.ic_launcher); builder.setTitle("未授权限"); builder.setMessage("确认退出吗？"); builder.setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub//MainFragmentActivity.this.finish(); System.exit(0); } }); builder.setNegativeButton("返回", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub } }); builder.show(); } } else { connect.setText("Open"); isOpen = false; try { Thread.sleep(200); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } MyApp.driver.CloseDevice(); totalrecv = 0; } } private void configUSB(){ if(isOpen) { if (MyApp.driver.SetConfig(baudRate, dataBit, stopBit, parity,//配置串口波特率，函数说明可参照编程手册 flowControl)) { Toast.makeText(MainActivity.this, "串口设置成功!", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(MainActivity.this, "串口设置失败!", Toast.LENGTH_SHORT).show(); } } } private void sendToUSB() { usbNumber = editText_table.getText().toString(); //byte[] to_send = toByteArray(usbNumber); byte[] to_send2 = toByteArray2(usbNumber); //txtContent.setText(new String(to_send)+"---"+new String(to_send2)); int retval = MyApp.driver.WriteData(to_send2, to_send2.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(); Toast t = Toast.makeText(context, "Succeed to send " + usbNumber, Toast.LENGTH_LONG); t.show(); }}activity_main.xml文件
<?xml version="1.0" encoding="utf-8"?> AndroidManifest.xml文件
<?xml version="1.0" encoding="utf-8"?> MyApp.java文件
package com.example.usb_to_ttl;import android.app.Application;import cn.wch.ch34xuartdriver.CH34xUARTDriver;public class MyApp extends Application {public static CH34xUARTDriver driver; //需要将CH34x的驱动类写在APP类下面，使得帮助类的生命周期与整个应用程序的生命周期是相同的}
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