我有一个简单的应用程序，允许一台 Android 设备连接到另一台设备，现在使用我的 Google Nexus 作为主机并使用 HTC Dessire 连接客户端，它工作正常，但如果我将主机作为我的 Google Nexus 和我的客户端作为 Google Nexus S 时，会出现错误，以下是尝试连接到服务器时的代码
public void connectToServer()
{
//Send a connect message to the server
try {
//Create a socket
socket = new DatagramSocket( port );
byte[] bufer = new byte[256];
//Send a message "connect" to the host
String msg = "connect";
int msgLength = msg.length();
bufer = msg.getBytes();
InetAddress address;
//Default ip address of the host
address = InetAddress.getByName("192.168.1.59");
DatagramPacket p = new DatagramPacket( bufer, bufer.length , address, port );
//Send packet
socket.send( p ); // <-- Error is here
} catch (UnknownHostException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//Receive the message back
byte[] buf = new byte[256];
DatagramPacket packet = new DatagramPacket( buf, buf.length );
//Try to receive a packet from the server
try
{
socket.receive( packet );
}
//Error
catch (IOException e)
{
Log.d(TAG, "Error with receiving data");
e.printStackTrace();
}
//Convert the packet to a string
String data = new String( buf, 0, packet.getLength() );
//Use the string to find out what ID this client is
ID = Integer.parseInt( data );
//Setup the client game
setUpClient();
//Debug
//Log.d(TAG, "Data received was :" + ID);
}
这里还有来自 Eclipse 的日志
04-02 15:51:56.875: D/gameState(2719): Start the game loop
04-02 15:51:59.754: D/gameState(2719): Coords: x=216.09375,y=387.8023
04-02 15:51:59.754: D/gameState(2719): Join game
04-02 15:51:59.773: E/InputEventReceiver(2719): Exception dispatching input event.
04-02 15:51:59.777: E/MessageQueue-JNI(2719): Exception in MessageQueue callback: handleReceiveCallback
04-02 15:51:59.793: E/MessageQueue-JNI(2719): android.os.NetworkOnMainThreadException
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:175)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at libcore.io.IoBridge.sendto(IoBridge.java:473)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at java.net.PlainDatagramSocketImpl.send(PlainDatagramSocketImpl.java:182)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at java.net.DatagramSocket.send(DatagramSocket.java:284)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.example.gelorph_v1.gameClient.connectToServer(gameClient.java:89)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.example.gelorph_v1.gameClient.<init>(gameClient.java:67)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.example.gelorph_v1.gamePanel.changeState(gamePanel.java:153)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.example.gelorph_v1.gamePanel.checkCollisions(gamePanel.java:117)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.example.gelorph_v1.gamePanel.onTouchEvent(gamePanel.java:77)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.View.dispatchTouchEvent(View.java:7127)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2176)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1877)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2176)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1877)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2176)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1877)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1925)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1379)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.app.Activity.dispatchTouchEvent(Activity.java:2396)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1873)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.View.dispatchPointerEvent(View.java:7307)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewRootImpl.deliverPointerEvent(ViewRootImpl.java:3174)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3119)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4155)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4134)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:4226)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:171)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.os.MessageQueue.nativePollOnce(Native Method)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.os.MessageQueue.next(MessageQueue.java:125)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.os.Looper.loop(Looper.java:124)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at android.app.ActivityThread.main(ActivityThread.java:4745)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at java.lang.reflect.Method.invokeNative(Native Method)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at java.lang.reflect.Method.invoke(Method.java:511)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
04-02 15:51:59.793: E/MessageQueue-JNI(2719): at dalvik.system.NativeStart.main(Native Method)
有什么原因导致这不起作用吗？
Canvas
更新
我刚刚将服务器和客户端更改为 AsyncTask 而不是线程，现在这是我的客户端代码
@Override
//Keep the game updated
protected String doInBackground(String... params)
{
//If the client is host, then start the server thread
if( host == true ) { setUpClient(); server.execute(); }
//game us now ready to be played
rdyForPlay = true;
boolean run = true;
boolean setupPlayer = false;
while( run )
{
//Tell the server to give position of players
//if( setupPlayer == true )
//{
// setUpClient();
// setupPlayer = false;
//}
//If this is a client then do this
if( host == false )
{
try {
//If the socket is not yet setup, set it up
if(socket == null)
{
socket = new DatagramSocket( port );
}
byte[] bufer = new byte[256];
//Using the ID given at the start, send X and Y position to the server
String msg = ID +":"+ assets[ID].returnPosX() +":"+ assets[ID].returnPosY();
int msgLength = msg.length();
bufer = msg.getBytes();
InetAddress address;
address = InetAddress.getByName("192.168.1.59");
DatagramPacket p = new DatagramPacket( bufer, bufer.length , address, port );
//Send the data
socket.send( p );
} catch (UnknownHostException e2) {
// TODO Auto-generated catch block
Log.d(TAG, "Error with unknown host");
e2.printStackTrace();
} catch (SocketException e) {
// TODO Auto-generated catch block
Log.d(TAG, "Error with socket");
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
Log.d(TAG, "Error with sending/receiving data");
e.printStackTrace();
}
//Receive the data from the serever
byte[] buf = new byte[256];
DatagramPacket packet = new DatagramPacket( buf, buf.length );
//Try and receive data from the server
try
{
socket.receive( packet );
}
//Error
catch (IOException e)
{
Log.d(TAG, "Error with receiving data");
e.printStackTrace();
}
String data = new String( buf, 0, packet.getLength() );
//Split the string up
String[] dataArray = data.split("#");
int newTotalPlayers = Integer.parseInt( dataArray[0] );
//Using the string do this
if( newTotalPlayers != totalPlayers )
{
Log.d(TAG," what is total amount of players:" + newTotalPlayers);
if( newTotalPlayers == 1 )
{
newPlayer( 0 );
totalPlayers = newTotalPlayers;
}
else
{
newPlayer( newTotalPlayers );
totalPlayers = newTotalPlayers;
}
}
//Do a for loop to go through dataArray
for( int i = 0; i < totalPlayers; i++)
{
//Update each user that is connected
String[] pos = dataArray[(i + 1)].split(":");
if( Integer.parseInt( pos[(i*3)] ) == ID )
{
Log.d(TAG, "Do nothing please");
}
else
{
assets[i].setPosition( Integer.parseInt( pos[(i*3) + 1] ), Integer.parseInt( pos[(i*3) + 2] ) );
}
}
}
//Host data will ofcourse be differnet
}
Log.d(TAG, "Error with run value");
return "finished";
}
我仍然遇到同样的错误...我是否错误地实现了 AsyncTask？
最佳答案
您正在 UI 线程中运行网络操作(因此出现异常android.os.NetworkOnMainThreadException)，这在较新版本的 Android 中是不允许的。请使用 AsyncTask 来代替。
确保在 doBackground 中调用您的方法
关于java - UDP Android 应用程序适用于 HTC，但不适用于 Nexus S，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/15767430/