allprojects {
    repositories {
      ...
      maven { url 'https://jitpack.io' }
    }
  }

  dependencies {
      compile 'com.github.zhouzhuo810:OkUSB:1.0.0'
  }

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

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

<?xml version="1.0" encoding="utf-8"?>
<resources>
  <!-- 要进行通信的USB设备的供应商ID（VID）和产品识别码（PID）-->
  <usb-device vendor-id="0403" product-id="6001" />
</resources>

  //初始化
  usb = new USB.USBBuilder(this)
      .setBaudRate(115200) //波特率
      .setDataBits(8)    //数据位
      .setStopBits(UsbSerialPort.STOPBITS_1) //停止位
      .setParity(UsbSerialPort.PARITY_NONE) //校验位
      .setMaxReadBytes(20)  //接受数据最大长度
      .setReadDuration(500) //读数据间隔时间
      .setDTR(false)  //DTR enable
      .setRTS(false)  //RTS enable
      .build();

  //实现监听连接状态和数据收发。
  usb.setOnUsbChangeListener(new USB.OnUsbChangeListener() {
    @Override
    public void onUsbConnect() {
      Toast.makeText(MainActivity.this, "conencted", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onUsbDisconnect() {
      Toast.makeText(MainActivity.this, "disconencted", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDataReceive(byte[] data) {
      tvResult.setText(new String(data, Charset.forName("GB2312")));
    }

    @Override
    public void onUsbConnectFailed() {
      Toast.makeText(MainActivity.this, "connect fail", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onPermissionGranted() {
      Toast.makeText(MainActivity.this, "permission ok", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onPermissionRefused() {
      Toast.makeText(MainActivity.this, "permission fail", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDriverNotSupport() {
      Toast.makeText(MainActivity.this, "no driver", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onWriteDataFailed(String error) {
      Toast.makeText(MainActivity.this, "write fail" + error, Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onWriteSuccess(int num) {
      Toast.makeText(MainActivity.this, "write ok " + num, Toast.LENGTH_SHORT).show();
    }
  });

    if (usb != null) {
      usb.destroy();
    }

Copyright 2017 zhouzhuo810

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.