我正在尝试对Android服务器/客户端软件集进行故障排除，这些软件似乎记录了大量包含“Socket setup caught IOexception”的logcat消息，因此我猜测它在一个循环中。 出于故障排除的目的，我在同一台物理设备上安装了服务器和客户端，遇到了同样的问题。 阅读代码我无法理解为什么会这样，我已经添加了注释// STACKEXCHANGE，我看到记录了三条logcat消息。谁能给我一些指示，我不是一个java程序员，只是一个热心的技术人员试图让这个工作..
logcat按以下顺序记录消息
ControlLooop启动 套接字设置捕获了IOexception 套接字成立 套接字关闭 controlLoopEnding
这是客户端软件的代码。
package com.jrbowling.robotclient;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.util.Log;
import android.widget.ToggleButton;
import android.widget.SeekBar;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;
import android.widget.EditText;
import android.widget.ImageView;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.view.Window;
import android.view.WindowManager;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.net.SocketTimeoutException;
import android.net.wifi.WifiManager;
import android.net.wifi.WifiManager.WifiLock;
import android.net.wifi.WifiInfo;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.view.View.OnTouchListener;
import android.view.MotionEvent;
import java.io.*;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.net.SocketTimeoutException;
import android.app.AlertDialog;
import android.content.DialogInterface;
import java.net.SocketAddress;
import java.net.InetSocketAddress;
import android.os.Handler;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
public class MainActivity extends Activity {
Thread vidThread = null;
Thread clientThread = null;
private Socket s;
private static final String TAG = "RobotClient";
//private ToggleButton tb;
private ImageButton forward_button;
private ImageButton reverse_button;
private ImageButton right_button;
private ImageButton left_button;
private SeekBar throttle;
private ImageView imageWindow;
private ImageView connectedLED;
private ImageView signalStrengthIndicator;
private Boolean stayConnected = false;
String vidURL = "";
private String robotIP = "";
String direction = "stop";
Integer speed = 100;
Boolean robotEnabled = true;
Boolean robotConnected = false;
private Handler GUIUpdateHandler = new Handler();
private Integer signalStrength = 0;
private SharedPreferences pref;
private long timeLastPress = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//set fullscreeen, black
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
setActivityBackgroundColor(0xff000000);
Log.i(TAG, "Robot client started");
initGUIComponents();
//get Robot IP from user, kick off threads and GUI updater
showIPAlert();
}
@Override
protected void onDestroy() {
Log.d(TAG,"onDestroy() called");
stayConnected = false;
socketCleanup();
super.onDestroy();
}
//@Override
//protected void onPause() {
// Log.d(TAG,"onPause() called");
// stayConnected = false;
// socketCleanup();
// super.onDestroy();
// }
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public void onBackPressed() {
//on back button, prompt user to press it again within 2 seconds to exit
Toast onBackPressedToast = Toast.makeText(this, "Press again within 2 seconds to confirm exit", Toast.LENGTH_SHORT);
long currentTime = System.currentTimeMillis();
if (currentTime - timeLastPress > 2000) {
onBackPressedToast.show();
timeLastPress = currentTime;
} else {
onBackPressedToast.cancel();
super.onBackPressed();
}
}
private void initGUIComponents()
{
imageWindow = (ImageView) findViewById(R.id.imageView1);
connectedLED = (ImageView) findViewById(R.id.imageViewConnectStatus);
signalStrengthIndicator = (ImageView) findViewById(R.id.ImageViewSignalStrength);
forward_button = (ImageButton) findViewById(R.id.forwardButton);
reverse_button = (ImageButton) findViewById(R.id.reverseButton);
right_button = (ImageButton) findViewById(R.id.rightButton);
left_button = (ImageButton) findViewById(R.id.leftButton);
throttle = (SeekBar)findViewById(R.id.throttleSeekbar);
throttle.setProgress(75);
forward_button.setOnTouchListener(forwardButtonListener);
reverse_button.setOnTouchListener(reverseButtonListener);
right_button.setOnTouchListener(rightButtonListener);
left_button.setOnTouchListener(leftButtonListener);
}
private void showIPAlert() {
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Please enter robot IP address");
alert.setMessage("Example: 192.168.1.100");
final EditText input = new EditText(this);
alert.setView(input);
input.setText(loadIP().toString());
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
robotIP = input.getText().toString();
Log.i(TAG, "User entered IP " + robotIP);
saveIP(robotIP);
//Handler launches GUIUpdater every 1000 ms. Launch when user clicks ok.
updateGUI();
//start network thread
stayConnected = true;
//launch network thread
clientThread = new Thread(new ClientThread());
clientThread.start();
vidURL = "http://"+robotIP+":8082/shot.jpg";
vidLoop();
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
appExit();
}
});
alert.show();
}
private void appExit()
{
Log.i(TAG, "Exit requested by user");
this.finish();
}
private OnTouchListener forwardButtonListener = new OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
switch ( event.getAction() ) {
case MotionEvent.ACTION_DOWN:
//setActivityBackgroundColor(0xffff0000);
direction = "forward";
break;
case MotionEvent.ACTION_UP:
//setActivityBackgroundColor(0xff000000);
direction = "stop";
break;
}
return false;
}
};
private OnTouchListener reverseButtonListener = new OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
switch ( event.getAction() ) {
case MotionEvent.ACTION_DOWN:
//setActivityBackgroundColor(0xffff0000);
direction = "reverse";
break;
case MotionEvent.ACTION_UP:
//setActivityBackgroundColor(0xff000000);
direction = "stop";
break;
}
return false;
}
};
private OnTouchListener rightButtonListener = new OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
switch ( event.getAction() ) {
case MotionEvent.ACTION_DOWN:
//setActivityBackgroundColor(0xffff0000);
direction = "rotateRight";
break;
case MotionEvent.ACTION_UP:
//setActivityBackgroundColor(0xff000000);
direction = "stop";
break;
}
return false;
}
};
private OnTouchListener leftButtonListener = new OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
switch ( event.getAction() ) {
case MotionEvent.ACTION_DOWN:
//setActivityBackgroundColor(0xffff0000);
direction = "rotateLeft";
break;
case MotionEvent.ACTION_UP:
//setActivityBackgroundColor(0xff000000);
direction = "stop";
break;
}
return false;
}
};
//save and retrieve IP address using the shared preferences framework
private void saveIP(String IP)
{
//set up shared preferences editor
pref = getApplicationContext().getSharedPreferences("RobotClient", 0);
Editor editor = pref.edit();
editor.putString("robotIP", IP);
editor.commit();
}
private String loadIP()
{
String result;
pref = getApplicationContext().getSharedPreferences("RobotClient", 0);
Editor editor = pref.edit();
result = pref.getString("robotIP", "10.20.30.43");
return result;
}
private void setActivityBackgroundColor(int color) {
//0xff00ff00 first two are transparency, then rgb
View view = this.getWindow().getDecorView();
view.setBackgroundColor(color);
}
//periodically run updater to set connection status and wifi signal strength from robot
private void updateGUI()
{
GUIUpdateHandler.postDelayed(GUIUpdater, 1000);
}
private Runnable GUIUpdater = new Runnable(){
public void run() {
//Periodically update GUI elements from sensor and other data
Log.d(TAG,"Connected is: " + robotConnected.toString());
//update connection status
if (robotConnected)
{
connectedLED.setImageResource(R.drawable.led_green);
//update the wifi signal strength indicator
if ((signalStrength == 5) || (signalStrength==4))
signalStrengthIndicator.setImageResource(R.drawable.wifi4);
if (signalStrength == 3)
signalStrengthIndicator.setImageResource(R.drawable.wifi3);
if (signalStrength == 2)
signalStrengthIndicator.setImageResource(R.drawable.wifi2);
if (signalStrength == 1)
signalStrengthIndicator.setImageResource(R.drawable.wifi1);
if (signalStrength == 0)
signalStrengthIndicator.setImageResource(R.drawable.wifi0);
}
else
{
connectedLED.setImageResource(R.drawable.led_red);
signalStrengthIndicator.setImageResource(R.drawable.wifi0);
}
if (stayConnected)
updateGUI();
}
};
public void setConnected(boolean connected) {
robotConnected = connected;
}
public void socketCleanup()
{
try {
Log.d("clientThread","Socket Closing");
if (s != null)
s.close();
setConnected(false);
} catch (IOException e) {
Log.d(TAG, "Client comm thread got IOException in socketCleanup().");
}
}
private void vidLoop() //started from GUI alert, then kept going with call me from asynctask
{
if (stayConnected)
{
ImageDownloader id = new ImageDownloader();
id.execute(vidURL);
}
}
//this very useful chunk of code is from http://www.peachpit.com/articles/article.aspx?p=1823692&seqNum=3
private class ImageDownloader extends AsyncTask<String, Integer, Bitmap>{
protected void onPreExecute(){
}
@Override
protected Bitmap doInBackground(String... params) {
//TODO Auto-generated method stub
try{
URL url = new URL(params[0]);
HttpURLConnection httpCon =
(HttpURLConnection)url.openConnection();
if(httpCon.getResponseCode() != 200)
throw new Exception("Failed to connect");
InputStream is = httpCon.getInputStream();
return BitmapFactory.decodeStream(is);
}catch(Exception e){
Log.e("Image","Failed to load image",e);
}
return null;
}
protected void onProgressUpdate(Integer... params){
//Update a progress bar here, or ignore it, it's up to you
}
protected void onPostExecute(Bitmap img){
ImageView iv = (ImageView)findViewById(R.id.imageView1);
if(iv!=null && img !=null){
iv.setImageBitmap(img);
//start next image grab
vidLoop();
}
}
protected void onCancelled(){
}
}
class ClientThread implements Runnable {
private static final int SERVERPORT = 8082;
public void run() {
Log.d("clientThread","clientThread started");
setConnected(false);
while ((!Thread.currentThread().isInterrupted()) && stayConnected)
{
controlLoop();
}
//user requested disconnect
Log.d("clientThread","clientThread ending");
}
void controlLoop()
{
BufferedReader s_input = null;
PrintWriter s_output = null;
String inputString = null;
String outputString = null;
Boolean continueLoop = true;
Log.d("clientThread","controlLoop starting");
//protocol:
//Java boolean: enabled or disabled
//Directions: stop, rotateRight, rotateLeft, forward, reverse
//Client sends: robotEnabled,direction,servoPanValue
//Server replies: sensor1,sensor2...
continueLoop = true;
try {
InetAddress serverAddr = InetAddress.getByName(robotIP);
Socket s = new Socket();
//int timeout = 2000; // DEFAULT milliseconds
int timeout = 6000; // milliseconds
SocketAddress sockaddr = new InetSocketAddress(serverAddr, SERVERPORT);
s.connect(sockaddr, timeout);
s_input = new BufferedReader(new InputStreamReader(s.getInputStream()));
s_output = new PrintWriter(s.getOutputStream(), true);
} catch (UnknownHostException e1) {
e1.printStackTrace();
Log.d("clientThread","Got invalid IP string in client thread");
continueLoop = false;
} catch (IOException e) {
Log.d("clientThread","Socket setup caught IOexception");
continueLoop = false;
//STACKEXCHANGE - THIS SEEMS TO BE WHERE THE CODE REPEATEDLY LOOPS AROUND TRYING TO CONNECT**********************************************************************************************
}
//STACKEXCHANGE - Loop starts below again and then logging "controlloop ending"
Log.d("clientThread","Socket Established");
setConnected(true);
try {
while ((stayConnected) && (continueLoop)) {
speed = throttle.getProgress();
if (stayConnected)
outputString = robotEnabled.toString() + "," + direction.toString() + "," + speed.toString();
else
outputString = "quit";
s_output.println(outputString);
if (!s_output.checkError())
{
inputString = s_input.readLine();
if (inputString == null)
{
continueLoop = false;
Log.d("clientThread","Unexpected disconnection.");
}
else
{
Log.d("clientThread","Client got: " + inputString.toString());
//parse returned string, which is just an integer containing the signal strength
try {
signalStrength = Integer.parseInt(inputString);
} catch(NumberFormatException nfe) {
Log.d(TAG,"Got invalid signal strength from client");
}
}
}
else
{
//printwriter.checkError returned true, something bad happened network-wise
continueLoop = false;
Log.d("clientThread","Printwriter.checkError() returned true, likely network problem");
}
}
socketCleanup();
Log.d("clientThread","controlLoop ending");
//STACKEXCHANGE - This is also logged in the catlog at the end of repetitive loop
} catch (IOException e) {
//this happens if the connection times out.
Log.d("clientThread", "Client comm thread got IOException in control loop.");
socketCleanup();
}
}//end control loop
} //end client thread
}
答案 0 :(得分：1)
这是因为你没有修改stayConnected。 你不断打电话
while ((!Thread.currentThread().isInterrupted()) && stayConnected)
{
controlLoop();
}
每次拨打电话时都会收到例外消息。仅将continueLoop修改为false。你应该在这种情况下打破你的时间或打断你的线程以及你的预期行为;或其他一些方法可行。