android usb转串口数据通信示例

usb转串口数据通信示例。物联网开发中也会经常用到usb转串口，对android手机进行通信。一般都会用otc线进行转换。我在GitHub下来一份代码，亲测可用。并进行了修改封装。

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

这篇博客代码的地址：http://download.csdn.net/download/qq_16064871/9978818

1、实现效果

第一次使用的时候，需要选择app调试

扫描界面，当有接口有连接的话，还有直接反应，跳转到这个界面。并有1秒扫描一次。

接受数据的界面，原始demo界面

代码封装后，重新写的接受数据的界面

2、代码示例

设备扫描

/* Copyright 2011-2013 Google Inc. * Copyright 2013 mike wakerly <[e-mail]> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, * USA. * * Project home page: https://github.com/mik3y/usb-serial-for-android */package com.hoho.android.usbserial.examples;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.hardware.usb.UsbDevice;import android.hardware.usb.UsbManager;import android.os.AsyncTask;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.os.SystemClock;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.ProgressBar;import android.widget.TextView;import android.widget.TwoLineListItem;import com.hoho.android.usbserial.driver.UsbSerialDriver;import com.hoho.android.usbserial.driver.UsbSerialPort;import com.hoho.android.usbserial.driver.UsbSerialProber;import com.hoho.android.usbserial.util.HexDump;import java.util.ArrayList;import java.util.List;import src.com.hoho.android.usbserial.examples.UsbSerialPortTopIO;/** * Shows a {@link ListView} of available USB devices. * * @author mike wakerly ([e-mail]) */public class DeviceListActivity extends Activity {    private final String TAG = DeviceListActivity.class.getSimpleName();    private UsbManager mUsbManager;    private ListView mListView;    private TextView mProgressBarTitle;    private ProgressBar mProgressBar;    private static final int MESSAGE_REFRESH = 101;    private static final long REFRESH_TIMEOUT_MILLIS = 5000;    private final Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case MESSAGE_REFRESH:                    refreshDeviceList();                    mHandler.sendEmptyMessageDelayed(MESSAGE_REFRESH, REFRESH_TIMEOUT_MILLIS);                    break;                default:                    super.handleMessage(msg);                    break;            }        }    };    private List<UsbSerialPort> mEntries = new ArrayList<UsbSerialPort>();    private ArrayAdapter<UsbSerialPort> mAdapter;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);        mListView = (ListView) findViewById(R.id.deviceList);        mProgressBar = (ProgressBar) findViewById(R.id.progressBar);        mProgressBarTitle = (TextView) findViewById(R.id.progressBarTitle);        mAdapter = new ArrayAdapter<UsbSerialPort>(this,                android.R.layout.simple_expandable_list_item_2, mEntries) {            @Override            public View getView(int position, View convertView, ViewGroup parent) {                final TwoLineListItem row;                if (convertView == null){                    final LayoutInflater inflater =                            (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);                    row = (TwoLineListItem) inflater.inflate(android.R.layout.simple_list_item_2, null);                } else {                    row = (TwoLineListItem) convertView;                }                final UsbSerialPort port = mEntries.get(position);                final UsbSerialDriver driver = port.getDriver();                final UsbDevice device = driver.getDevice();                final String title = String.format("Vendor %s Product %s",                        HexDump.toHexString((short) device.getVendorId()),                        HexDump.toHexString((short) device.getProductId()));                row.getText1().setText(title);                final String subtitle = driver.getClass().getSimpleName();                row.getText2().setText(subtitle);                return row;            }        };        mListView.setAdapter(mAdapter);        mListView.setOnItemClickListener(new ListView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                Log.d(TAG, "Pressed item " + position);                if (position >= mEntries.size()) {                    Log.w(TAG, "Illegal position.");                    return;                }                final UsbSerialPort port = mEntries.get(position);                showConsoleActivity(port);            }        });    }    @Override    protected void onResume() {        super.onResume();        mHandler.sendEmptyMessage(MESSAGE_REFRESH);    }    @Override    protected void onPause() {        super.onPause();        mHandler.removeMessages(MESSAGE_REFRESH);    }    private void refreshDeviceList() {        showProgressBar();        new AsyncTask<Void, Void, List<UsbSerialPort>>() {            @Override            protected List<UsbSerialPort> doInBackground(Void... params) {                Log.d(TAG, "Refreshing device list ...");                SystemClock.sleep(1000);                final List<UsbSerialDriver> drivers =                        UsbSerialProber.getDefaultProber().findAllDrivers(mUsbManager);                final List<UsbSerialPort> result = new ArrayList<UsbSerialPort>();                for (final UsbSerialDriver driver : drivers) {                    final List<UsbSerialPort> ports = driver.getPorts();                    Log.d(TAG, String.format("+ %s: %s port%s",                            driver, Integer.valueOf(ports.size()), ports.size() == 1 ? "" : "s"));                    result.addAll(ports);                }                return result;            }            @Override            protected void onPostExecute(List<UsbSerialPort> result) {                mEntries.clear();                mEntries.addAll(result);                mAdapter.notifyDataSetChanged();                mProgressBarTitle.setText(                        String.format("%s device(s) found",Integer.valueOf(mEntries.size())));                hideProgressBar();                Log.d(TAG, "Done refreshing, " + mEntries.size() + " entries found.");            }        }.execute((Void) null);    }    private void showProgressBar() {        mProgressBar.setVisibility(View.VISIBLE);        mProgressBarTitle.setText(R.string.refreshing);    }    private void hideProgressBar() {        mProgressBar.setVisibility(View.INVISIBLE);    }    private void showConsoleActivity(UsbSerialPort port) {        UsbSerialPortTopIO.GetInstance().SetUsbSerialPort(this,port);        final Intent intent = new Intent(this, com.hoho.android.usbserial.examples.CustomSerialConsoleActivity.class);        intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_NO_HISTORY);        startActivity(intent);//        com.hoho.android.usbserial.examples.SerialConsoleActivity.show(this,port);    }}

3、接收数据

进行了简单的封装类

封装时候遇到最大问题就是，连接失败。连接失败，记得释放资源，调用这个方法 onDeviceStateChange();

package src.com.hoho.android.usbserial.examples;import android.content.Context;import android.hardware.usb.UsbDeviceConnection;import android.hardware.usb.UsbManager;import android.location.LocationManager;import android.util.Log;import com.hoho.android.usbserial.driver.UsbSerialPort;import com.hoho.android.usbserial.util.SerialInputOutputManager;import java.io.IOException;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class UsbSerialPortTopIO {    private volatile static UsbSerialPortTopIO usbSerialPortTopIO = null;    private static UsbSerialPort sPort = null;    private final String TAG = "Show";    private static Context mContext = null;    public static UsbSerialPortTopIO GetInstance() {        if (usbSerialPortTopIO == null ) {            synchronized (UsbSerialPortTopIO.class){                if (usbSerialPortTopIO == null){                    usbSerialPortTopIO = new UsbSerialPortTopIO();                }            }        }        return usbSerialPortTopIO;    }    ConnectListener mConnectListener = null;    public void RegConnectListener(ConnectListener arg0) {        mConnectListener = arg0;    }    TopDataIOListener mIOListener = null;    public void RegIOListener(TopDataIOListener arg0) {        mIOListener = arg0;    }    public void UnRegIOListener() {        mIOListener = null;    }    public boolean SendData(int nLength, byte[] data) {        if (mSerialIoManager != null) {            mSerialIoManager.writeAsync(data);        }        return false;    }    public void Connect() {        onDeviceStateChange();        Log.d(TAG, "Resumed, port=" + sPort);        if (sPort == null) {            if (null != mConnectListener)                mConnectListener.OnConnectStatusCallBack(false);        } else {            final UsbManager usbManager = (UsbManager) mContext.getSystemService(Context.USB_SERVICE);            UsbDeviceConnection connection = usbManager.openDevice(sPort.getDriver().getDevice());            if (connection == null) {                if (null != mConnectListener)                    mConnectListener.OnConnectStatusCallBack(false);                return;            }            try {                sPort.open(connection);                sPort.setParameters(115200, 8, UsbSerialPort.STOPBITS_1, UsbSerialPort.PARITY_NONE);            } catch (IOException e) {                if (null != mConnectListener)                    mConnectListener.OnConnectStatusCallBack(false);                try {                    sPort.close();                } catch (IOException e2) {                    if (null != mConnectListener)                        mConnectListener.OnConnectStatusCallBack(false);                }                sPort = null;                return;            }            if (null != mConnectListener)                mConnectListener.OnConnectStatusCallBack(true);        }    }    public void DisConnect() {        stopIoManager();        if (sPort != null) {            try {                sPort.close();            } catch (IOException e) {                // Ignore.            }            sPort = null;        }    }    public boolean SetUsbSerialPort(Context context, UsbSerialPort port) {        sPort = port;        mContext = context.getApplicationContext();        return true;    }    public UsbSerialPortTopIO() {    }    private final ExecutorService mExecutor = Executors.newSingleThreadExecutor();    private SerialInputOutputManager mSerialIoManager;    private final SerialInputOutputManager.Listener mListener =            new SerialInputOutputManager.Listener() {                @Override                public void onRunError(Exception e) {                    Log.d("Show", "Runner stopped.");                    if (mIOListener != null)                        mIOListener.OnIOCallBack(e.toString().getBytes().length, e.toString().getBytes());                    onDeviceStateChange();                }                @Override                public void onNewData(final byte[] data) {                    if (mIOListener != null)                        mIOListener.OnIOCallBack(data.length, data);                }            };    private void stopIoManager() {        if (mSerialIoManager != null) {            Log.i(TAG, "Stopping io manager ..");            mSerialIoManager.stop();            mSerialIoManager = null;        }    }    private void startIoManager() {        if (sPort != null) {            Log.i(TAG, "Starting io manager ..");            mSerialIoManager = new SerialInputOutputManager(sPort, mListener);            mExecutor.submit(mSerialIoManager);        }    }    private void onDeviceStateChange() {        stopIoManager();        startIoManager();    }}

3、怎么调用

针对上面代码封装后，可以进行简单方便的调用

public class CustomSerialConsoleActivity extends Activity {    /**     * Driver instance, passed in statically via     *     * <p/>     * This is a devious hack; it'd be cleaner to re-create the driver using     * arguments passed in with the {@link #startActivity(Intent)} intent. We     * can get away with it because both activities will run in the same     * process, and this is a simple demo.     */    private TextView mDumpTextView;    private ScrollView mScrollView;    private TextView mTitleTextView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.serial_console2);        mDumpTextView = (TextView) findViewById(R.id.consoleText);        mScrollView = (ScrollView) findViewById(R.id.demoScroller);        mTitleTextView = (TextView) findViewById(R.id.demoTitle);        UsbSerialPortTopIO.GetInstance().RegConnectListener(mConnectListener);        UsbSerialPortTopIO.GetInstance().RegIOListener(topDataIOListener);        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                UsbSerialPortTopIO.GetInstance().Connect();            }        });    }    //接收数据IO    private TopDataIOListener topDataIOListener = new TopDataIOListener() {        @Override        public void OnIOCallBack(int nLength,final byte[] data) {            CustomSerialConsoleActivity.this.runOnUiThread(new Runnable() {                @Override                public void run() {                    CustomSerialConsoleActivity.this.updateReceivedData(data);                }            });        }    };    private ConnectListener mConnectListener = new ConnectListener() {        @Override        public void OnConnectStatusCallBack(boolean bSucceed) {            if (bSucceed){                mTitleTextView.setText("succeed");            }else {                mTitleTextView.setText("faile");            }        }        @Override        public void OnDisConnectCallBack() {        }    };    @Override    protected void onPause() {        super.onPause();    }    @Override    public void finish() {        UsbSerialPortTopIO.GetInstance().DisConnect();        super.finish();    }    @Override    protected void onResume() {        super.onResume();    }    private void updateReceivedData(byte[] Data) {        final String message = "Read " + Data.length + " bytes: \n"                + HexDump.dumpHexString(Data) + "\n\n";        mDumpTextView.append(message);        mScrollView.smoothScrollTo(0, mDumpTextView.getBottom());    }}

4、权限

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

activity 扫描界面权限

        <activity            android:name="com.hoho.android.usbserial.examples.DeviceListActivity"            android:label="@string/app_name"            android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.DEFAULT" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>            <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" />        </activity>

GitHub代码里面有一个usbSerialForAndroid是源码。我在自已的demo有打包成jar包。进行调用。

暂时发现这份代码比较通用，网上有人说不同的芯片，代码不一样。

我测试机器是系统5.0以上的。

测试了一个4.2的系统，测试不通过。

建议：1、出现失败情况下，记得换一下android 机器进行测试。

           2、一直失败情况下，记得卸载所有与串口调试的应用。因为串口授权（就是图一：为USB设备选择一个应用程序）。只授权一个。所以卸载所有授权的，或者清除授权。重新测试。