[英]How to solve delay in Inputstream.read() in android?
I am working on a Bluetooth multiplayer game project.I followed the android Bluetooth overview https://developer.android.com/guide/topics/connectivity/bluetooth strictly.I used the following code to read and write data:- 我正在研究蓝牙多人游戏项目。我严格遵循android蓝牙概述https://developer.android.com/guide/topics/connectivity/bluetooth.I使用以下代码读取和写入数据:-
public class MyBluetoothService {
private static final String TAG = "MY_APP_DEBUG_TAG";
private Handler handler; // handler that gets info from Bluetooth service
// Defines several constants used when transmitting messages between the
// service and the UI.
private interface MessageConstants {
public static final int MESSAGE_READ = 0;
public static final int MESSAGE_WRITE = 1;
public static final int MESSAGE_TOAST = 2;
// ... (Add other message types here as needed.)
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
private byte[] mmBuffer; // mmBuffer store for the stream
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();
} catch (IOException e) {
Log.e(TAG, "Error occurred when creating input stream", e);
}
try {
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "Error occurred when creating output stream", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
mmBuffer = new byte[1024];
int numBytes; // bytes returned from read()
// Keep listening to the InputStream until an exception occurs.
while (true) {
try {
// Read from the InputStream.
numBytes = mmInStream.read(mmBuffer);
// Send the obtained bytes to the UI activity.
Message readMsg = handler.obtainMessage(
MessageConstants.MESSAGE_READ, numBytes, -1,
mmBuffer);
readMsg.sendToTarget();
} catch (IOException e) {
Log.d(TAG, "Input stream was disconnected", e);
break;
}
}
}
// Call this from the main activity to send data to the remote device.
public void write(byte[] bytes) {
try {
mmOutStream.write(bytes);
// Share the sent message with the UI activity.
Message writtenMsg = handler.obtainMessage(
MessageConstants.MESSAGE_WRITE, -1, -1, mmBuffer);
writtenMsg.sendToTarget();
} catch (IOException e) {
Log.e(TAG, "Error occurred when sending data", e);
// Send a failure message back to the activity.
Message writeErrorMsg =
handler.obtainMessage(MessageConstants.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString("toast",
"Couldn't send data to the other device");
writeErrorMsg.setData(bundle);
handler.sendMessage(writeErrorMsg);
}
}
// Call this method from the main activity to shut down the connection.
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close the connect socket", e);
}
}
}
}
For writing data I am using the following code:- 为了写数据,我使用以下代码:
String[] myString={"HI!","How Are YOU"};
mConnected.write(Arrays.toString(myString).getBytes());
But I see that inputstream.read() is receiving data quite late after another device is sending the data.I found some questions regarding this,but none of them seem to provide a satisfactory answer.Any suggestion will be highly helpful. 但是我看到inputstream.read()在另一台设备发送数据之后很晚才接收数据。我发现了一些与此有关的问题,但似乎没有一个令人满意的答案。任何建议都将非常有帮助。
After 后
mmOutStream.write(bytes);
try to call: 尝试致电:
mmOutStream.flush();
this will cause the bytes to be sent immediately. 这将导致立即发送字节。
https://docs.oracle.com/javase/7/docs/api/java/io/OutputStream.html#flush() https://docs.oracle.com/javase/7/docs/api/java/io/OutputStream.html#flush()
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