我正在尝试使用以下来源制作文件传输蓝牙应用程序：
http://developer.android.com/guide/topics/connectivity/bluetooth.html
当我尝试使用InputStream.read()方法以这种方式获取InputStream字节时：
public class ConnectedThread extends Thread {
...(some code here)
public void run(){
byte[] buffer = new byte[1024];
int bytes = -1;
//Keep listening to the InputStream while connected
while (true){
try {
bytes = this.mmInStream.read(buffer);
//* this part is not reached
if (bytes==-1){
Log.d("NoData:","-1");
}
}
catch(Exception e){
Log.d("inStream exception:",e.getMessage());
break;
}
}
}
...(some code here)
}
永远不会到达代码的下一部分(在这种情况下为“if”部分),也不会出现Log.D调试输出或我放入的其他任何内容.我刚从LogCat收到此消息：
BluetoothSocket read in: android.net.LocalStocketImpl$SocketInputStream@f7e
b08 len: 1024
要将数据从客户端传输到服务器,我这样做：
public class MainActivity extends Activity {
...(some code here)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
clientConnect();
//serverConnect();
}
...(some code here)
public void clientConnect(){
Set<BluetoothDevice> devices;
devices = bConfig.getPairedDevices();
if (devices == null){
return;
}
if (devices.size() > 0) {
BluetoothDevice device = devices.iterator().next();
ConnectThread connectTransmit = new ConnectThread(device,bConfig.getBluetoothAdapter(),BluetoothConfig.mUUID);
connectTransmit.start();
Toast.makeText(this, "connected", Toast.LENGTH_SHORT).show();
socket = connectTransmit.mmSocket;
ConnectedThread connectedThread = new ConnectedThread(socket);
//write file bytes to the connected thread, so the thread can receive its own input written bytes later
File file_to_transfer = new File(Environment.getExternalStorageDirectory() + "/txtTransfer.txt");
//get bytes from our File
int size = (int) file_to_transfer.length();
byte[] bytes = new byte[size];
try {
//14b are read succesfully, the whole text file
BufferedInputStream buf = new BufferedInputStream(new FileInputStream(file_to_transfer));
buf.read(bytes,0,bytes.length);
buf.close();
}catch (FileNotFoundException e){
Log.d("FileNotFoundException:",e.getMessage());
}catch (IOException e){
Log.d("IOException:",e.getMessage());
}
//send the data to the server
connectedThread.start();
connectedThread.write(bytes);
//connectedThread.cancel();
}
}
...(some code here)
}
AcceptThread(实现的服务器部分)工作,因为当我运行客户端部分连接然后传输数据时,在设备中进行调试时,服务器部分上的LogCat激活并到达线程的run方法,我调用ConnectedThread实现,但之后“显然”读取字节但它在LogCat上卡住而没有错误.
请让我知道如何完成读取字节以移动到流程的下一部分.
谢谢
解决方法:
您被阻止等待更多输入.
在流结束测试之后,标记为…的部分(这里的一些代码)应该在读取循环内.注意如果read()返回-1并不表示“没有数据”,则表示流结束,您应该关闭套接字并中断读取循环.否则,您应该继续处理您刚读过的数据.目前你只是读取并忽略所有输入,直到流结束,这是没有意义的.充其量只能处理最后一个部分缓冲区,你不知道它有多长.