我使用
android示例代码进行修改.只想收到包裹
但是,我的代码只在这里修改
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_STATE_CHANGE:
if(D) Log.i(TAG, "MESSAGE_STATE_CHANGE: " + msg.arg1);
switch (msg.arg1) {
case BluetoothChatService.STATE_CONNECTED:
mTitle.setText(R.string.title_connected_to);
mTitle.append(mConnectedDeviceName);
mConversationArrayAdapter.clear();
break;
case BluetoothChatService.STATE_CONNECTING:
mTitle.setText(R.string.title_connecting);
break;
case BluetoothChatService.STATE_LISTEN:
case BluetoothChatService.STATE_NONE:
mTitle.setText(R.string.title_not_connected);
break;
}
break;
case MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
// construct a string from the buffer
String writeMessage = new String(writeBuf);
mConversationArrayAdapter.add(writeMessage);
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
// construct a string from the valid bytes in the buffer
//String readMessage = new String(readBuf, 0, msg.arg1);
//String readMessage = BytesTrans_fill.bytesToHexString(readBuf);
Log.d("read", BytesTrans.bytes2HexString(readBuf,msg.arg1));
String readMessage = BytesTrans.bytes2HexString(readBuf,msg.arg1);
ppV.setText(ppV.getText().toString() + readMessage + "★");
break;
case MESSAGE_DEVICE_NAME:
// save the connected device's name
mConnectedDeviceName = msg.getData().getString(
DEVICE_NAME);
Toast.makeText(getApplicationContext(), "Connected to "
+ mConnectedDeviceName, Toast.LENGTH_SHORT).show();
break;
case MESSAGE_TOAST:
Toast.makeText(getApplicationContext(), msg.getData().getString(TOAST),
Toast.LENGTH_SHORT).show();
break;
}
}
};
和BluetoothChatService
public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes, -1, buffer)
.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
}
}
并添加此功能
package com.example.android.BluetoothChat;
public class BytesTrans {
public static String byte2HexString(byte b) {
String ret = "";
String hex = Integer.toHexString(b & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
ret += hex.toUpperCase() + " ";
return ret;
}
public static String bytes2HexString(byte[] b, int count) {
String ret = "";
for (int i = 0; i < count; i++) {
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = '0' + hex;
}
ret += hex.toUpperCase() + " ";
}
return ret;
}
/*public static String String2byte(String b)
{
String[] ttt;
for (int i = 0; i < b.length(); i++)
{
for (int j= i; j<=i+1; j++)
{
ttt[i] = b;
}
}
String ttmp = "";
String tmp = "";
ret += tmp;
}*/
public static int hexToTen(String b) {
int D2 = Integer.parseInt(b,16);
return D2;
}
}
但是这个程序有时甚至不能显示我的发送包的框架
我发送这样的包：
aa07210820001202140934390000000000000000000000000000000000000000000297c0fe6b
但有时收到包裹：
aa000297c0fe6b02131452470000000000000000000000000000000000000000000297c0fe6b
如何更改我的代码以接收完整包的框架
最佳答案 您尚未显示任何蓝牙接口代码.但是,如果这主要基于BluetoothChat示例,那么BluetoothChat示例存在一个简单的问题：基本上,当从蓝牙套接字发出read()并放入字节数组时,该数组引用是正如您所做的那样,使用Handler发送到UI.实际的问题是,如果使用BluetoothChat示例以比输入速率更快的速度接收数据,那么您开始看到字符丢失或变得混乱,因为后续的read()在UI仍然覆盖时覆盖了数组读取数组以提取收到的最后一串字符.
因此,如果您的MESSAGE_WRITE对象包含对数组的引用,那么您将调用socket read(),这可能就是您丢失字符的原因.因此,尝试在Message中使用Arrays.copyOf()发送数组的副本.或者,也许你可以使用循环缓冲区安排.
当我使用BluetoothChat示例作为我的项目的基础时,我遇到了这个问题.我亲自解决问题(并消除了复制缓冲区等的需要)是实现一种机制,我将告诉蓝牙连接线程(包含阻塞套接字.read()的线程),方法调用的方法,我期望响应的字节数(幸运的是,我正在处理的协议允许知道响应长度).然后,连接线程仅在收到完整响应时发送消息,而不是向UI发送带有响应片段的多个消息.
