我现在已经好几天都在挣扎，并且有一种潜在的怀疑，这是显而易见的事情。
我最近收购了一些XBee Xstick ZB（http://www.digi.com/products/wireless-modems-peripherals/wireless-range-extenders-peripherals/xstick）并尝试将它们连接到Android手机进行网状网络连接。在它们设置正确后，在计算机上使用非常简单 - 只需打开终端窗口并读取/写入串行数据到端口。我想我会在Android应用中使用相同的方法。不幸的是，即使我的应用程序显示连接成功，我也没有收到另一方的任何数据（我的计算机使用另一个XBee棒）。我对Android很新，所以请看一下，让我知道我可能缺少什么。
package com.spawar.dale.teminal2;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.hardware.usb.UsbRequest;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import java.nio.ByteBuffer;
public class term extends Activity implements View.OnClickListener, Runnable{
private static final String TAG = "TerminalActivity";
private Button send;
private TextView output;
private EditText input;
private UsbManager mUsbManager;
private UsbDevice mDevice;
private UsbDeviceConnection mConnection;
private UsbInterface mInterface;
private UsbEndpoint mEndpointIn;
private UsbEndpoint mEndpointOut;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_term);
send = (Button)findViewById(R.id.send);
output = (TextView) findViewById(R.id.output);
input = (EditText) findViewById(R.id.input);
mUsbManager = (UsbManager)getSystemService(Context.USB_SERVICE);
}
public void onClick(View view)
{
char c;
int i=0;
while (input.getText().length() > i) {
c=input.getText().charAt(i);
sendMessage(c);
i++;
}
output.append(input.getText());
}
@Override
public void onPause() {
super.onPause();
}
@Override
public void onResume(){
super.onResume();
Intent intent = getIntent();
Log.d(TAG, "intent: " + intent);
String action = intent.getAction();
if (UsbManager.ACTION_USB_DEVICE_ATTACHED!=null) {
//String list = mUsbManager.getDeviceList().toString();
//Log.d(TAG,list);
//output.append(list.toString());
UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if(device!=null){
setDevice(device);
} else {
Log.d(TAG,"no device found");
}
}
/*
UsbDevice device = (UsbDevice)intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
Log.d(TAG,"reached point 1");
output.append("reached point 1");
if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
setDevice(device);
output.append("reached point a /n");
} else if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
if (mDevice != null && mDevice.equals(device)) {
output.append("reached point b");
setDevice(null);
}
}
*/
}
@Override
public void onDestroy() {
super.onDestroy();
}
private void setDevice(UsbDevice device) {
Log.d(TAG, "setDevice " + device);
//output.append(" setDevice "+ device);
output.append("Interface count is: "+device.getInterfaceCount()+"\n");
if (device.getInterfaceCount() != 1) {
Log.e(TAG, "could not find interface");
output.append(" could not find interface");
return;
}
UsbInterface intf = device.getInterface(0);
output.append("Endpoint count is: "+intf.getEndpointCount()+"\n");
//Endpoint 0, direction IN
//Endpoint 1, direction OUT
UsbEndpoint endIn = intf.getEndpoint(0);
output.append("Endpoint 1: \n");
output.append("Direction: " +endIn.getDirection()+ "\n");
output.append("Type: "+endIn.getType()+ "\n");
output.append("Endpoint 2: \n");
UsbEndpoint endOut = intf.getEndpoint(1);
output.append("Direction: " + endOut.getDirection()+ "\n");
output.append("Type: " + endOut.getType() + "\n");
/* if (intf.getEndpointCount() != 1) {
Log.e(TAG, "could not find endpoint");
output.append(" could not find endpoint");
return;
} */
//endpoint should be of type interrupt
//UsbEndpoint ep = intf.getEndpoint(0);
mDevice = device;
mInterface = intf;
mEndpointIn = endIn;
mEndpointOut = endOut;
if (device != null) {
UsbDeviceConnection connection = mUsbManager.openDevice(device);
if (connection != null && connection.claimInterface(intf, true)) {
Log.d(TAG, "open success!");
output.append(" open Success!!");
mConnection = connection;
Thread thread = new Thread(this);
thread.start();
}
else {
Log.d(TAG,"open fail");
output.append(" open fail");
mConnection = null;
}
}
}
private void sendMessage(char messageChar) {
Log.d(TAG, "sendMessage " + messageChar);
if (mConnection != null) {
byte[] message = new byte[5];
String test = new String("hello");
message=test.getBytes();
ByteBuffer buf = ByteBuffer.wrap(message);
Log.d(TAG, "buffer is "+buf.toString());
UsbRequest requestOut = new UsbRequest();
output.append("\nLength: " +message.length);
Boolean success = mConnection.claimInterface(mInterface, true);
mConnection.bulkTransfer(mEndpointOut,message,message.length,500);
requestOut.initialize(mConnection,mEndpointOut);
//Boolean success = requestOut.queue(buf,5);
output.append("Mission "+success.toString());
requestOut.queue(buf,message.length);
output.append("Request: " + mConnection.requestWait().toString());
//mConnection.controlTransfer(0x21, 0x9, 0x200, 0, message, message.length, 0);
}
}
@Override
public void run() {
ByteBuffer buffer = ByteBuffer.allocate(1);
UsbRequest requestIn = new UsbRequest();
requestIn.initialize(mConnection,mEndpointIn);
byte status = -1;
while(true) {
//Queue a request on the interrupt endpoint
requestIn.queue(buffer, 1);
//Send poll status command
//Wait for status event
if (mConnection.requestWait() == requestIn) {
byte newStatus = buffer.get(0);
if (newStatus != status) {
Log.d(TAG, "got status "+ newStatus);
status = newStatus;
output.append(Byte.toString(status));
}
try {
Thread.sleep(100);
} catch (InterruptedException e) {
}
} else {
Log.e(TAG, "requestWait failed, exiting");
break;
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_term, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
我手机屏幕上的当前输出显示： 接口数为：1 端点计数为：2 终点1： 方向：128 类型：2 终点2： 方向：0 类型：2 打开成功!! 81 长度5使命真实....
************************************ EDIT ********** *********
我在这方面取得了一些进展。通过将ByteBuffer缓冲区更改为Byte []缓冲区，然后将整个run（）函数内容移动到onResume（），我得到一些数据。出于某种原因，变量的作用就像它们尚未设置，所以程序在run（）中突然崩溃。
这是新问题。无论我通过另一方推送什么，唯一读入的数据是8196.例如，在我的计算机上输入＆＃39; abc＆＃39;，但在设备上它读取＆＃39; 8196 8196 8196＆＃39; ;。起初我想也许我正在从错误的USB端点读取，但只有两个，第二个用于输出。有什么想法吗？