我目前正忙于开发一个通过TCP与服务器建立连接的应用程序。我目前与服务器有连接，但当我尝试向服务器发送消息时，我的应用程序崩溃时出现android.os.NetworkOnMainThreadException错误。
这是我的代码：
package jabo.com.roommapper2.TCP;
import android.os.AsyncTask;
import android.util.Log;
public class TCPThread extends Thread {
private TcpClient mTcpClient = null;
private boolean mRun = true;
String TAG = "TCPThread";
@Override
public void run(){
new ConnectTask().execute("");
while (mRun) {
}
}
public void cancel(){
mRun = false;
}
public boolean sendMessage(String message){
Log.d(TAG, "sendMessage: "+message);
if(mTcpClient != null){
mTcpClient.sendMessage(message);
return true;
}
else{
return false;
}
}
private class ConnectTask extends AsyncTask<String, String, TcpClient> {
@Override
protected TcpClient doInBackground(String... message) {
//we create a TCPClient object and
mTcpClient = new TcpClient(new TcpClient.OnMessageReceived() {
@Override
//here the messageReceived method is implemented
public void messageReceived(String message) {
//this method calls the onProgressUpdate
//publishProgress(message);
Log.i("Debug","Input message: " + message);
}
});
mTcpClient.run();
return null;
}
protected void onProgressUpdate(String... message){
}
}
}
线程从我的控制页面活动开始：
package jabo.com.roommapper2.Screens;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.util.Set;
import java.util.UUID;
import jabo.com.roommapper2.BT.BTConnectie;
import jabo.com.roommapper2.R;
import jabo.com.roommapper2.TCP.TCPThread;
import jabo.com.roommapper2.TCP.TcpClient;
import jabo.com.roommapper2.extraControls.JoystickView;
public class controlPage extends Activity {
private static final String TAG = "controlPage";
private JoystickView joystick;
private int REQUEST_ENABLE_BT = 1;
public static BTConnectie BT;
boolean devicefound = false;
BluetoothAdapter mBluetoothAdapter;
static Context context;
static Toast toast;
TextView roomname;
private int RUN = 1;
private int PAUZE = 0;
private int state = 0;
TCPThread TCP;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_control_page);
TCP = new TCPThread();
TCP.start();
roomname = findViewById(R.id.RoomName);
//toast
Context context = getApplicationContext();
this.context =context;
//BT
String btdeviceName = "LAPTOP-BOAS";
//String btdeviceHardwareAddress = "F6:D0:05:15:59:26";
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
//
}
if (!mBluetoothAdapter.isEnabled()) {
Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
}
String devices[] = new String[] {};
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
// There are paired devices. Get the name and address of each paired device.
int i =0;
for (BluetoothDevice device : pairedDevices) {
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
if(deviceName.equalsIgnoreCase(btdeviceName) /*&& deviceHardwareAddress.equalsIgnoreCase(btdeviceHardwareAddress)*/){
devicefound = true;
try {
BT = new BTConnectie(device);
BT.start();
Log.d("Device","Connected");
}
catch (Exception e){
}
break;
}
else{
i++;
devicefound = false;
Log.d(deviceName,btdeviceName);
popup("device not found please connect device first");
//devices[i] = deviceName;
//Log.d(deviceHardwareAddress,btdeviceHardwareAddress);
Log.d("Device","not found");
}
}
}
if (devicefound == false){
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
}
//Joystick
joystick = (JoystickView) findViewById(R.id.joystick);
joystick.setOnJoystickMoveListener(new JoystickView.OnJoystickMoveListener() {
@Override
public void onValueChanged(int angle, int input_power, int direction) {
int power= input_power;
byte[] message = new byte[4];
message[2] = (byte)power;
message[3]= (byte)'\n';
switch (direction) {
case JoystickView.FRONT:
message[1] = 1;
break;
case JoystickView.FRONT_RIGHT:
message[1] = 2;
break;
case JoystickView.RIGHT:
message[1] = 3;
break;
case JoystickView.RIGHT_BOTTOM:
message[1] = 4;
break;
case JoystickView.BOTTOM:
message[1] = 5;
break;
case JoystickView.BOTTOM_LEFT:
message[1] = 6;
break;
case JoystickView.LEFT:
message[1] = 7;
break;
case JoystickView.LEFT_FRONT:
message[1] = 8;
break;
default:
message[1] = 0;
break;
}
message[0] = (byte)(message.length+16);
try {
if (BTConnectie.mConnectedThread.isAlive()) {
BTConnectie.mConnectedThread.write(message);
} else {
popup("cant send to device");
}
}
catch (Exception e){
popup("cant send to device");
}
}
}, JoystickView.DEFAULT_LOOP_INTERVAL);
}
public void start(View v){
if(state == RUN) {
if (!roomname.getText().toString().equalsIgnoreCase("")) {
state = PAUZE;
popup("started");
TCP.sendMessage("Start<LOG>");
}
else{
popup("Please give a room name");
}
}
else{
popup("stopped");
state = RUN;
TCP.sendMessage("Stop<LOG>");
}
}
@Override
protected void onDestroy(){
super.onDestroy();
Log.d(TAG, "onDestroy: destroyed");
TCP.cancel();
//BT.cancel();
}
@Override
protected void onPause(){
super.onPause();
Log.d(TAG, "onPause: paused");
}
@Override
protected void onStop(){
super.onStop();
Log.d(TAG, "onStop: stopped");
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Discovery has found a device. Get the BluetoothDevice
// object and its info from the Intent.
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
String deviceName = device.getName();
String deviceHardwareAddress = device.getAddress(); // MAC address
}
}
};
public static void popup(String message){
int duration = Toast.LENGTH_SHORT;
if(toast != null) {
toast.cancel();
toast = Toast.makeText(context,message,duration);
toast.show();
}
else {
toast = Toast.makeText(context,message,duration);
toast.show();
}
}
}
我的问题是如何正确调用TCP.sendMessage()
此功能在启动功能中调用，按下按钮时将调用该功能。
线程调用TcpClient类，如下所示：
package jabo.com.roommapper2.TCP;
import android.os.Message;
import android.util.Log;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Socket;
/**
* Description
*
* @author Catalin Prata
* Date: 2/12/13
*/
public class TcpClient {
final String TAG = "TcpClient";
public static final String SERVER_IP = "192.168.101.11"; //your computer IP address
public static final int SERVER_PORT = 11000;
// message to send to the server
private String mServerMessage;
// sends message received notifications
private OnMessageReceived mMessageListener = null;
// while this is true, the server will continue running
private boolean mRun = false;
// used to send messages
private PrintWriter mBufferOut;
// used to read messages from the server
private BufferedReader mBufferIn;
/**
* Constructor of the class. OnMessagedReceived listens for the messages received from server
*/
public TcpClient(OnMessageReceived listener) {
mMessageListener = listener;
}
/**
* Sends the message entered by client to the server
*
* @param message text entered by client
*/
public void sendMessage(String message) {
if (mBufferOut != null && !mBufferOut.checkError()) {
mBufferOut.println(message);
mBufferOut.flush();
}
}
/**
* Close the connection and release the members
*/
public void stopClient() {
Log.i("Debug", "stopClient");
// send mesage that we are closing the connection
//sendMessage(Constants.CLOSED_CONNECTION + "Kazy");
mRun = false;
if (mBufferOut != null) {
mBufferOut.flush();
mBufferOut.close();
}
mMessageListener = null;
mBufferIn = null;
mBufferOut = null;
mServerMessage = null;
}
public void run() {
mRun = true;
try {
//here you must put your computer's IP address.
Log.e("TCP Client", "C: Connecting...");
//create a socket to make the connection with the server
Socket socket = new Socket();
socket.connect(new InetSocketAddress(SERVER_IP, SERVER_PORT), 10000);
//socket.connect(,30*1000);
try {
Log.i("Debug", "inside try catch");
//sends the message to the server
mBufferOut = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
//receives the message which the server sends back
mBufferIn = new BufferedReader(new InputStreamReader(socket.getInputStream()));
// send login name
//sendMessage(Constants.LOGIN_NAME + PreferencesManager.getInstance().getUserName());
//sendMessage("Hi");
//in this while the client listens for the messages sent by the server
while (mRun) {
mServerMessage = mBufferIn.readLine();
if (mServerMessage != null && mMessageListener != null) {
//call the method messageReceived from MyActivity class
mMessageListener.messageReceived(mServerMessage);
}
}
Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + mServerMessage + "'");
} catch (Exception e) {
Log.e("TCP", "S: Error", e);
} finally {
//the socket must be closed. It is not possible to reconnect to this socket
// after it is closed, which means a new socket instance has to be created.
socket.close();
}
} catch (Exception e) {
Log.e("TCP", "C: Error", e);
}
}
//Declare the interface. The method messageReceived(String message) will must be implemented in the MyActivity
//class at on asynckTask doInBackground
public interface OnMessageReceived {
public void messageReceived(String message);
}
}
我在Android设备上使用Android 4.4.2进行了连接，现在我忙于安卓7，现在它停止工作了，有解释吗？
如果我的代码中有一些荷兰语单词，那是因为我住在荷兰，所以也很抱歉我的英语不好。
提前致谢
编辑：
我已经解决了我的问题，我用以下方法做到了：
new Thread(new Runnable() {
@Override
public void run() {
TCP.sendMessage(name+"<NAME>");
TCP.sendMessage("<RMAP>");
}
}).start();
感谢所有帮助过的人