我正忙着使用谷歌眼镜制作内部导航应用程序。 我正在使用DataInputStream / DataOutputstream将方向数据从玻璃发送到Android手机。
客户端/
protected void onHandleIntent(Intent intent) {
try {
Socket mClientSocket = new Socket(serverIP, PORT);
Log.d("ODSA","Client is connected");
InputStream inputStream = mClientSocket.getInputStream();
DataInputStream dataInputStream = new DataInputStream(inputStream);
isServiceRunning = true;
long lastTime = System.currentTimeMillis();
while (isServiceRunning) {
int bytesAvailabe = dataInputStream.available();
Log.d("ODSA","Waiting for bytesAvailable: Real bytes available: " + bytesAvailabe);
if(bytesAvailabe > 4) {
if (bytesAvailabe > 8)
{
long bytesToSkip = bytesAvailabe - 8;
Log.d("ODSA","BytesSkipped: " + bytesToSkip);
inputStream.skip(bytesToSkip);
}
Log.d("ODSA","Trying to read Azimuth");
float azimuth = dataInputStream.readFloat();
Log.d("ODSA","Trying to read Pitch");
float pitch = dataInputStream.readFloat();
String resultTxt = "Received from server - Azimuth: " + azimuth + " | Pitch: " + pitch;
Log.d("ODSA", resultTxt);
Log.d("ODSA","Sende broadcast intent");
Intent broadcastIntent = new Intent();
//deze wil ik eigenlijk niet hier maar krijg de reference niet te pakken in orientation service doe ik iets fout ?
broadcastIntent.setAction("com.odca.intent.action.MESSAGE_PROCESSED");
broadcastIntent.addCategory(Intent.CATEGORY_DEFAULT);
broadcastIntent.putExtra(PARAM_OUT_MSG, resultTxt);
sendBroadcast(broadcastIntent);
Log.d("ODSA","Done sending broadcast intent");
}
else{
Thread.sleep(1000);
}
}
} catch (IOException e) {
e.printStackTrace();
//TODO SEND ERROR MESSAGE TO ACTIVITY
}
catch (InterruptedException e) {
e.printStackTrace();
//TODO SEND ERROR MESSAGE TO ACTIVITY
}
}
SERVER /
protected void onHandleIntent(Intent intent) {
try {
//Create connection to orientation sensor
Context startActivityContext = getBaseContext();
this.orientationSensorManager = new OrientationSensorManager(startActivityContext);
//Start orientation server
ServerSocket mServerSocket = new ServerSocket();
mServerSocket.setReuseAddress(true);
mServerSocket.bind(new InetSocketAddress(PORT));
Log.d("ODSA","Waiting for connection on server");
Socket mClientSocket = mServerSocket.accept();
//TODO SEND MESSAGE TO ACTIVITY (GLASS IS CONNECTED)
Log.d("ODSA","Server is connected");
OutputStream oStream = mClientSocket.getOutputStream();
DataOutputStream dataOutputStream = new DataOutputStream(oStream);
isServiceRunning = true;
long lastTime = System.currentTimeMillis();
while (isServiceRunning) {
long endTime = System.currentTimeMillis();
long difference = endTime - lastTime;
if(difference > 100) {
float[] results = orientationSensorManager.getOrientationData();
dataOutputStream.writeFloat(results[0]);
dataOutputStream.writeFloat(results[1]);
lastTime = System.currentTimeMillis();
//TODO Send orientation data to activity
Log.d("ODSA","Data Send to client - Azimuth: " + String.valueOf(results[0] + " | Pitch: " + results[1]));
}
}
if (mClientSocket != null) mClientSocket.close();
if (mServerSocket != null) mServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
服务器发送数据就好了。并且在测试时运行完美（以100毫秒发布数据）。
问题在于客户端代码。由于某种原因，当流应该有明显数据时，datainputstream.available返回0。为什么会这样？
我将包含一些logcat输出，以便更好地理解我的问题。在logcat中很容易看到问题（这是以1000毫秒的间隔运行）。欢迎任何建议。
10-23 13:48:48.452 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 8
10-23 13:48:48.452 2897-3214/com.odca D/ODSA﹕ Trying to read Azimuth
10-23 13:48:48.452 2897-3214/com.odca D/ODSA﹕ Trying to read Pitch
10-23 13:48:48.452 2897-3214/com.odca D/ODSA﹕ Received from server - Azimuth: 33.915466 | Pitch: 82.41343
10-23 13:48:48.452 2897-3214/com.odca D/ODSA﹕ Sende broadcast intent
10-23 13:48:48.462 2897-3214/com.odca D/ODSA﹕ Done sending broadcast intent
10-23 13:48:48.462 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:49.472 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 24
10-23 13:48:49.472 2897-3214/com.odca D/ODSA﹕ BytesSkipped: 16
10-23 13:48:49.472 2897-3214/com.odca D/ODSA﹕ Trying to read Azimuth
10-23 13:48:49.472 2897-3214/com.odca D/ODSA﹕ Trying to read Pitch
10-23 13:48:49.482 2897-3214/com.odca D/ODSA﹕ Received from server - Azimuth: 34.72676 | Pitch: 82.230484
10-23 13:48:49.482 2897-3214/com.odca D/ODSA﹕ Sende broadcast intent
10-23 13:48:49.502 2897-3214/com.odca D/ODSA﹕ Done sending broadcast intent
10-23 13:48:49.502 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:50.502 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:51.512 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:52.502 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:53.502 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:54.512 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:55.512 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:56.512 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:57.512 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:58.512 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 776
10-23 13:48:58.512 2897-3214/com.odca D/ODSA﹕ BytesSkipped: 768
10-23 13:48:58.512 2897-3214/com.odca D/ODSA﹕ Trying to read Azimuth
10-23 13:48:58.512 2897-3214/com.odca D/ODSA﹕ Trying to read Pitch
10-23 13:48:58.512 2897-3214/com.odca D/ODSA﹕ Received from server - Azimuth: 33.074875 | Pitch: 82.22403
10-23 13:48:58.522 2897-3214/com.odca D/ODSA﹕ Sende broadcast intent
10-23 13:48:58.532 2897-3214/com.odca D/ODSA﹕ Done sending broadcast intent
10-23 13:48:58.532 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:48:59.542 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 64
10-23 13:48:59.542 2897-3214/com.odca D/ODSA﹕ BytesSkipped: 56
10-23 13:48:59.542 2897-3214/com.odca D/ODSA﹕ Trying to read Azimuth
10-23 13:48:59.542 2897-3214/com.odca D/ODSA﹕ Trying to read Pitch
10-23 13:48:59.542 2897-3214/com.odca D/ODSA﹕ Received from server - Azimuth: 32.31331 | Pitch: 81.64859
10-23 13:48:59.552 2897-3214/com.odca D/ODSA﹕ Sende broadcast intent
10-23 13:48:59.572 2897-3214/com.odca D/ODSA﹕ Done sending broadcast intent
10-23 13:48:59.572 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 16
10-23 13:48:59.572 2897-3214/com.odca D/ODSA﹕ BytesSkipped: 8
10-23 13:48:59.572 2897-3214/com.odca D/ODSA﹕ Trying to read Azimuth
10-23 13:48:59.572 2897-3214/com.odca D/ODSA﹕ Trying to read Pitch
10-23 13:48:59.572 2897-3214/com.odca D/ODSA﹕ Received from server - Azimuth: 32.404648 | Pitch: 82.11532
10-23 13:48:59.572 2897-3214/com.odca D/ODSA﹕ Sende broadcast intent
10-23 13:48:59.582 2897-3214/com.odca D/ODSA﹕ Done sending broadcast intent
10-23 13:48:59.582 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 0
10-23 13:49:00.592 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 72
10-23 13:49:00.592 2897-3214/com.odca D/ODSA﹕ BytesSkipped: 64
10-23 13:49:00.592 2897-3214/com.odca D/ODSA﹕ Trying to read Azimuth
10-23 13:49:00.592 2897-3214/com.odca D/ODSA﹕ Trying to read Pitch
10-23 13:49:00.592 2897-3214/com.odca D/ODSA﹕ Received from server - Azimuth: 32.3553 | Pitch: 82.41276
10-23 13:49:00.592 2897-3214/com.odca D/ODSA﹕ Sende broadcast intent
10-23 13:49:00.612 2897-3214/com.odca D/ODSA﹕ Done sending broadcast intent
10-23 13:49:00.612 2897-3214/com.odca D/ODSA﹕ Waiting for bytesAvailable: Real bytes available: 16
答案 0 :(得分：0)
实际上并没有义务返回非零，而许多实现都没有。例如，仅接收到部分SSL记录的SSLSocket可能不知道数据将持续多长时间，并且多年来它总是返回零。
只需摆脱available()调用和跳过，读取所有内容，然后在read()方法中阻止，或者在没有输入的情况下使用readFloat()方法