与Arduino的Android的蓝牙通讯 [英] Android bluetooth communication with Arduino
问题描述
我目前正在研究谷歌的蓝牙聊天的例子。我们的目标是获得机器人和和的Arduino之间的通信工作的根据本实施例
I am currently looking at Google's Bluetooth Chat example. The goal is to get communication between android and and Arduino working based on this example.
虽然从智能手机到Arduino通信是伟大的工作，其他的方向不会：
当从阿尔杜伊诺发送字节到智能电话，以下code为用于接收
While communication from the smartphone to the Arduino is working great, the other direction does not: When sending bytes from the Arduino to the smartphone, the following code is used for receiving:
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(MainActivity.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
这具有以下问题：
- 在我的主要活动中，我得到一个递给字节数组总是1024字节长。不管是什么输入字节长度。这将是非常好的，如果我有一个idication多少字节收到。
- 的字节数似乎并没有得到一次全部读取。例如。在code以上的被称为多次，但从来没有缓冲区包含了所有我从阿尔杜伊诺发送的字节数。有时，只有第一字节，那么以后只有最后一个字节。
- 虽然这code是卡列斯多次，我的主要活动，仅得到通知一次。怎么会是这样？
什么是做正确的方式。每个人都应该实施收集和并置字节的机制？还是我用这个code走错了路？
What is the right way to do this. Should one implement a mechanism that collects and concatenates the bytes? Or am I using this code the wrong way?
推荐答案
我一直有麻烦每次读一个字节的缓冲区大于一。这是因为没有办法保证正确接收到的所有字节。我的工作就是四处打电话，每次重复一个字节读取并如实填写本人的缓冲区。如果这样，我的任何字节不读生病抓在我connectedThread的I / O脚部分，并可以选择处理它，但是我想要的。
I always had trouble reading a byte buffer greater than one at a time. This is because there is no way to guarantee that you received all the bytes correctly. My work around was to call read repeatedly one byte at a time and fill out my buffer. That way if any of my bytes aren't read ill catch that in the I/O catch part of my connectedThread and can choose to deal with it however I want.
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the input and output streams, using temp objects because
// member streams are final
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) { }
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
byte[] buffer; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
// Read from the InputStream
// You can define this buffer to be 1024 or anything you like
buffer = new byte[3];
mmOutStream.write(253);
bytes = mmInStream.read(buffer,0,1);
mmOutStream.write(254);
bytes = mmInStream.read(buffer,1,1);
mmOutStream.write(255);
bytes = mmInStream.read(buffer,2,1);
mHandler.obtainMessage(MESSAGE_READ, buffer).sendToTarget();
}
catch (IOException e) {
break;
}
}
}
/* Call this from the main activity to send data to the remote device */
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
} catch (IOException e) { }
}
}
在这种情况下，我用了一个无符号字节数组从0-255重新present整数。此外，我使用的值255-253的命令来告诉我的Arduino送我某些类型的信息。您没有设置任何值命令重新present到Arduino的，相反，你可以告诉过值，它需要每一个接收信息的请求时发送的Arduino循环。我发现这是唯一的方式，可以确认你接收的字节量的一种（即大小的字节[]缓冲），尽管在这种情况下，我做了没有放任何东西在我的catch语句为connectedThread，你可以在那里把一个读命令确认收到一个字节。
In this case I used a unsigned byte array to represent integers from 0-255. Furthermore I used values 255-253 as commands to tell my Arduino to send me certain types of information. You do not have to set any value to represent a command to arduino, instead you can just tell the arduino to loop through values it needs to send each time it receives a request for information. I found out this is one of the only ways to can confirm the amounts of bytes you received(i.e the size of your byte[] buffer).Although in this case I did not put anything in my catch statement for the connectedThread you could put a read command in there to confirm you receive a byte.
下面是我如何处理的readBuffer ...
Here is how I dealt with the readBuffer...
/*
* Bluetooth Handler Method
*/
ConnectedThread connectedThread;
Handler mHandler = new Handler(){
public void handleMessage(Message msg){
super.handleMessage(msg);
switch(msg.what){
case SUCCESS_CONNECT:
// Do Something;
Toast.makeText(getActivity(),"CONNECTED",Toast.LENGTH_SHORT).show();
connectedThread = new ConnectedThread((BluetoothSocket)msg.obj);
listView.setVisibility(View.GONE);
connectedThread.start();
break;
case MESSAGE_READ:
byte[] readBuf = (byte[])msg.obj;
int tempInt = byteToInt(readBuf[0]);
int speedInt = byteToInt(readBuf[1]);
int cadenceInt = byteToInt(readBuf[2]);
EditText temperatureData = (EditText)getActivity().findViewById(R.id.temperatureData);
temperatureData.setText(Integer.toString(tempInt) + " C" );
EditText cadenceData = (EditText)getActivity().findViewById(R.id.cadence);
cadenceData.setText(Integer.toString(cadenceInt) + " rpm");
EditText speedData = (EditText)getActivity().findViewById(R.id.speed_data);
speedData.setText(Integer.toString(speedInt) + " kph");
}
}
};
在这种情况下，我在我的手机上显示实时传感器数据。但是你可以做任何事情。
In this case I was displaying live sensor data on my phone. But you can do anything really.
希望这有助于。
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