在 Android 中通过蓝牙接收 xml 字符串时出错 [英] Error with receiving xml strings via bluetooth in Android
问题描述
我正在开发一个应用程序，它通过蓝牙(来自 Arduino 和安卓手机)接收 xml 作为字符串.
i am developing an App which receives xml as String over bluetooth (from Arduino and android phones).
我从蓝牙收到无效/不完整的字符串.蓝牙被定义为 Android 服务.每次我收到一个字符串时，它都不是原始形式，无论我是从 arduino 还是其他 android 手机发送的.xml 解析函数正在工作，我已经检查过了.
I am getting invalid/incomplete strings from the bluetooth . the Bluetooth is defined as an Android service. Every time i receive a string its not in its original form no mater i send it from arduino or other android phone. the xml parsing function is working i have checked that.
这是我接收字符串的代码
Here is my code where i am receiving the string
mConnectedThread = new ConnectedThread(btSocket);
mConnectedThread.start();
h = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case RECIEVE_MESSAGE: // if receive massage
byte[] readBuf = (byte[]) msg.obj;
String strIncom = new String(readBuf, 0, msg.arg1); // create string from bytes array
sb.append(strIncom); // append string
int endOfLineIndex = sb.indexOf("\n"); // determine the end-of-line
if (endOfLineIndex > 0) { // if end-of-line,
String sbprint = sb.substring(0, endOfLineIndex); // extract string
sendXML(sbprint); // this method is for sending the xml string
sb.delete(0, sb.length()); // and clear
}
Log.d(TAG, "...String:"+ sb.toString() + "Byte:" + msg.arg1 + "...");
Log.d("IncString", strIncom);
break;
}
};
};
这是我正在使用的示例 xml 字符串
Here is a sample xml String i am using
<head><hbt v='100'/><hrg v='75'/></head>
我总是得到字符串但不完整 **v='100'/><hrg v='75'** 或 **</head>**
i always get the string but not complete like this **v='100'/><hrg v='75'** or **</head>**
如果问题不清楚，请告诉我任何我会更新的内容
If the question is not clear tell me any thing i will update
提前谢谢
推荐答案
我用下面的代码成功地做到了...
I did this successfully with the following code...
byte[] buffer = new byte[128]; // buffer store for the stream
int bytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs
while (true) {
try {
bytes = mmInStream.read(buffer);
byte[] readBuf = (byte[]) buffer;
String strIncom = new String(readBuf, 0, bytes); // create string from bytes array
sb.append(strIncom); // append string
int endOfLineIndex = sb.indexOf("\r\n"); // determine the end-of-line
if (endOfLineIndex > 0) {
// add the current string to eol to a local string
String sbprint = sb.substring(0, endOfLineIndex);
// get the start and end indexes of the heading
int startHeading = sb.indexOf("HE");
int endHeading = sb.indexOf("/HE");
// set the heading
blahblah.setCurrentHeading(sb.substring((startHeading + 2), endHeading));
....
然后在我从arduino发送的文本中检索到我想要的所有信息后:
Then after I retrieved all the information I wanted from the text sent by the arduino I called:
sb.delete(0, sb.length());
来自我的 adruino 的字符串如下所示:::
The string coming from my adruino looks like the following:::
void taskTransmitData(void)
{
// start the xml
Serial.print("HE");
Serial.print(pMyMemory->currentHeading);
Serial.print("/HE");
.....
Serial.println();
}
希望这有帮助...
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