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[英]How to make a UDP Connection while having a TCP connection with the client?
[英]How to make a UDP connection in android
我正試圖在我的galaxy tab
和我的laptop
之間建立連接。 所以我試圖在我的筆記本電腦和客戶端活動上運行服務器活動,但它不起作用。 這是服務器和客戶端代碼。 哪里出錯了?
服務器:
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView txt = (TextView)findViewById(R.id.textView1);
int port = 12345;
byte [] message = new byte [1500];
DatagramPacket p = new DatagramPacket (message,message.length);
try {
InetAddress serveraddr = InetAddress.getByName("192.168.1.116");
DatagramSocket s = new DatagramSocket (port,serveraddr);
while (true){
s.receive(p);
String text = new String (message,0,p.getLength());
txt.setText(text);
}
} catch (SocketException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
客戶:
public class MainActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText edt = (EditText)findViewById(R.id.editText1);
Button btn = (Button)findViewById(R.id.button1);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
String msg = edt.getText().toString();
int port = 12345;
try {
DatagramSocket s = new DatagramSocket();
InetAddress local = InetAddress.getByName("192.168.1.116");
int msg_lenght = msg.length();
byte []message = msg.getBytes();
DatagramPacket p = new DatagramPacket(message,msg_lenght,local,port);
s.send(p);
} catch (SocketException e) {
e.printStackTrace();
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
這是日志 :
09-17 23:49:55.190:D / dalvikvm(5892):延遲啟用CheckJNI 09-17 23:49:55.690:D / CLIPBOARD(5892):在啟動輸入時隱藏剪貼板對話框:由其他人完成... ! 09-17 23:49:59.590:D / AndroidRuntime(5892):關閉VM 09-17 23:49:59.590:W / dalvikvm(5892):threadid = 1:線程退出未捕獲異常(組= 0x40c4f1f8)09 -17 23:49:59.590:E / AndroidRuntime(5892):致命異常:主09-17 23:49:59.590:E / AndroidRuntime(5892):android.os.NetworkOnMainThreadException 09-17 23:49:59.590:E / AndroidRuntime(5892):在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)09-17 23:49:59.590:E / AndroidRuntime(5892):at libcore.io.BlockGuardOs.sendto(BlockGuardOs。 java:175)09-17 23:49:59.590:E / AndroidRuntime(5892):at libcore.io.IoBridge.sendto(IoBridge.java:463)09-17 23:49:59.590:E / AndroidRuntime(5892) :at java.net.PlainDatagramSocketImpl.send(PlainDatagramSocketImpl.java:182)09-17 23:49:59.590:E / AndroidRuntime(5892):at java.net.DatagramSocket.send(DatagramSocket.java:307)09-17 23:49:59.590:E / AndroidRuntime(5892):at com.example.udpclient.MainActivity $ 1.onClick(MainActivity.java:36)09-17 23:49:59.590:E / Androi dRuntime(5892):在android.view.View.performClick(View.java:3620)09-17 23:49:59.590:E / AndroidRuntime(5892):在android.view.View $ PerformClick.run(View.java) :14322)09-17 23:49:59.590:E / AndroidRuntime(5892):在android.os.Handler.handleCallback(Handler.java:605)09-17 23:49:59.590:E / AndroidRuntime(5892):在android.os.Handler.dispatchMessage(Handler.java:92)09-17 23:49:59.590:E / AndroidRuntime(5892):at android.os.Looper.loop(Looper.java:137)09-17 23 :49:59.590:E / AndroidRuntime(5892):在android.app.ActivityThread.main(ActivityThread.java:4507)09-17 23:49:59.590:E / AndroidRuntime(5892):at java.lang.reflect。 Method.invokeNative(Native Method)09-17 23:49:59.590:E / AndroidRuntime(5892):at java.lang.reflect.Method.invoke(Method.java:511)09-17 23:49:59.590:E / AndroidRuntime(5892):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:978)09-17 23:49:59.590:E / AndroidRuntime(5892):at com.android.internal。 os.ZygoteInit.main(ZygoteInit.java:745)09-17 23:49:59 .590:E / AndroidRuntime(5892):at dalvik.system.NativeStart.main(Native Method)09-17 23:50:34.320:I / Process(5892):發送信號。 PID:5892 SIG:9
09-17 23:49:59.590: E/AndroidRuntime(5892): android.os.NetworkOnMainThreadException
09-17 23:49:59.590: E/AndroidRuntime(5892): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
09-17 23:49:59.590: E/AndroidRuntime(5892): at libcore.io.BlockGuardOs.sendto(BlockGuardOs.java:175)
你不應該在ui線程中進行網絡或時間加強操作
另請參閱: Android:NoClassDefFoundError,適用於某些應用用戶或Android開發人員信息
結帳: activity.runOnUi
您在服務器的onCreate中有一個無限循環。 你不應該! 創建一個用於輪詢套接字的線程。
您的代碼有2個問題
09-17 23:49:59.590:E / AndroidRuntime(5892):致命異常:主09-17 23:49:59.590:E / AndroidRuntime(5892):android.os.NetworkOnMainThreadException
在主線程上循環while(true)
:
while(true) { s.receive(p); String text = new String (message,0,p.getLength()); txt.setText(text); }
只是快速解決方案......
創建一個udpOutputData字符串:
String udpOutputData;
在代碼中創建一個新線程:
//-----UDP send thread
Thread udpSendThread = new Thread(new Runnable() {
@Override
public void run() {
while (true) {
try {
Thread.sleep(100);
}
catch (InterruptedException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
if (sendUdp == true) {
try {
// get server name
InetAddress serverAddr = InetAddress.getByName(outputIP);
Log.d("UDP", "C: Connecting...");
// create new UDP socket
DatagramSocket socket = new DatagramSocket();
// prepare data to be sent
byte[] buf = udpOutputData.getBytes();
// create a UDP packet with data and its destination ip & port
DatagramPacket packet = new DatagramPacket(buf, buf.length, serverAddr, broadcastPort);
Log.d("UDP", "C: Sending: '" + new String(buf) + "'");
// send the UDP packet
socket.send(packet);
socket.close();
Log.d("UDP", "C: Sent.");
Log.d("UDP", "C: Done.");
}
catch (Exception e) {
Log.e("UDP", "C: Error", e);
}
try {
Thread.sleep(100);
}
catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
sendUdp = false;
}
}
}
});
創建一個方法,以便每次要發送一些udp數據時調用:
public void sendUdp(String udpMsg) {
udpOutputData = udpMsg;
sendUdp = true;
}
每次要發送udp數據包時,都會調用該方法並為輸出數據傳遞一個字符串:
String s = "hello from app";
sendUdp(s);
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