[英]Cannot create ObjectInputStream with InputStream for a Bluetooth Socket on the Android Platform
我正在为Android手机编写多人游戏。 通过蓝牙进行通信。 我已设法使用输入/输出流将字节从一个电话发送到另一个电话。 因为我需要能够传输我想要对象流的对象。 但是,当我尝试使用我的流创建一个Objectstream时,我的程序挂起了指令。
public class ConnectedThread extends Thread {
private static final String TAG = "Connected Thread";
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
private Handler mHandler;
private ObjectInputStream ois;
private ObjectOutputStream oos;
public ConnectedThread(BluetoothSocket socket,Handler h) {
mmSocket = socket;
mHandler = h;
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;
Log.d(TAG,"attempting to create OIS");
try {
ois = new ObjectInputStream(mmInStream);
// 指令new ObjectInputStream(mmInStream)永远不会完成执行 。 它似乎没有抛出错误,因为我抓住了它。 它只是挂在这个指令。 此行下面的代码都没有执行过。
} catch (Exception e) {
Log.e(TAG,"Error");
Log.d(TAG,e.getMessage());
e.printStackTrace();
}
Log.d(TAG,"attempting to create OOS");
try {
oos = new ObjectOutputStream(mmOutStream);
} catch (IOException e) {
Log.e(TAG,"IO exception for Output Stream, I have no idea what caused this");
Log.d(TAG,e.getMessage());
}
}
public void run() {.....}
我究竟做错了什么?
在构造ObjectInputStream.
之前 ObjectOutputStream,
只需构造ObjectOutputStream,
并在两端flush()
ObjectInputStream.
您不必编写自己的任何数据。
正如EJP建议的......
ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
oos.flush();
ObjectInputStream is = new ObjectInputStream(socket.getInputStream());
好吧,我想我知道我做错了什么。 对象流更复杂,似乎ObjectInputStream构造函数需要在创建流之前处理数据。 我解决了这个问题
这就是我现在正在使用的(注意我还添加了一个缓冲区):
public ConnectedThread(BluetoothSocket socket,Handler h) {
mmSocket = socket;
mHandler = h;
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 (Exception e) {
Log.d(TAG,"Error in getting Input Streams");
Log.w(TAG,e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
Log.d(TAG,"The socket is: " + mmSocket);
Log.d(TAG,"The streams are: " + mmInStream + mmOutStream);
Log.d(TAG,"attempting to create BufStreams");
final BufferedOutputStream bufo = new BufferedOutputStream(mmOutStream);
final BufferedInputStream bufi = new BufferedInputStream(mmInStream);
Log.d(TAG,"attempting to create OOS");
try {
oos = new ObjectOutputStream(bufo);
} catch (StreamCorruptedException e) {
Log.d(TAG,"Caught Corrupted Stream Exception");
Log.w(TAG,e);
} catch (IOException e) {
Log.d(TAG,"Caught IOException");
Log.w(TAG,e);
}
Log.d(TAG,"done OOS");
if(oos==null)
{
Log.d(TAG,"oos is null!!!!");
}
Thread s = new Thread(){
public void run(){
Log.d(TAG,"attempting to create OIS");
try {
ois = new ObjectInputStream(bufi);
} catch (StreamCorruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.d(TAG,"completed OIS");
if(ois == null)
{
Log.d(TAG,"OIS is null");
}
}
};
s.start();
try {
Log.d(TAG,"writing and flushing 1");
oos.write(1);
oos.flush();
} catch (IOException e1) {
Log.d(TAG,"CaugtIOexception");
Log.w(TAG,e1);
}
Log.d(TAG,"sleeping to make sure stream is set up");
while (ois == null) {
try {
Thread.sleep(500);
} catch (InterruptedException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
}
Log.d(TAG, "done Sleeping");
// Read out the 1 to make sure everything is okay
int i = 0;
try {
i = ois.read();
} catch (IOException e) {
Log.d(TAG, "error reading");
e.printStackTrace();
}
Log.d(TAG,"I received an i of: " + i);
Log.d(TAG,"OO Streams set up");
}
public void run() {...
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