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>  <!-- 要進行通信的USB設備的供應商ID（VID）和產品識別碼（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)    //數據位      .setStopBits(UsbSerialPort.STOPBITS_1) //停止位      .setParity(UsbSerialPort.PARITY_NONE) //校驗位      .setMaxReadBytes(20)  //接受數據最大長度      .setReadDuration(500) //讀數據間隔時間      .setDTR(false)  //DTR enable      .setRTS(false)  //RTS enable      .build();  //實現監聽連接狀態和數據收發。  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 zhouzhuo810Licensed 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-2.0Unless required by applicable law or agreed to in writing, softwaredistributed 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 andlimitations under the License.