我是Android编程的新手。我的应用程序在创建套接字时崩溃。我添加到Manifest互联网许可,Wifi开启了。我在PC上有一台等待Android客户端的服务器;它适用于我的其他应用程序。我不知道这个应用程序的问题在哪里。我很感激任何帮助。
记录错误
01-23 13:10:32.110:E / AndroidRuntime(4493):致命异议:主要
01-23 13:10:32.110:E / AndroidRuntime(4493):java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.usapp / com.example.usapp.Settings}:android.os.NetworkOnMainThreadException
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1751)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1767)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.app.ActivityThread.access $ 1500(ActivityThread.java:122)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1005)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.os.Handler.dispatchMessage(Handler.java:99)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.os.Looper.loop(Looper.java:132)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.app.ActivityThread.main(ActivityThread.java:4028)
01-23 13:10:32.110:E / AndroidRuntime(4493):at java.lang.reflect.Method.invokeNative(Native Method)
01-23 13:10:32.110:E / AndroidRuntime(4493):at java.lang.reflect.Method.invoke(Method.java:491)
01-23 13:10:32.110:E / AndroidRuntime(4493):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:844)
01-23 13:10:32.110:E / AndroidRuntime(4493):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
01-23 13:10:32.110:E / AndroidRuntime(4493):at dalvik.system.NativeStart.main(Native Method)
01-23 13:10:32.110:E / AndroidRuntime(4493):引起:android.os.NetworkOnMainThreadException
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.os.StrictMode $ AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1077)
01-23 13:10:32.110:E / AndroidRuntime(4493):at dalvik.system.BlockGuard $ WrappedNetworkSystem.connect(BlockGuard.java:368)
01-23 13:10:32.110:E / AndroidRuntime(4493):at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:208)
01-23 13:10:32.110:E / AndroidRuntime(4493):at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:431)
01-23 13:10:32.110:E / AndroidRuntime(4493):at java.net.Socket.connect(Socket.java:901)
01-23 13:10:32.110:E / AndroidRuntime(4493):at java.net.Socket.connect(Socket.java:844)
01-23 13:10:32.110:E / AndroidRuntime(4493):at com.example.usapp.Stream.doInBackground(Stream.java:46)
01-23 13:10:32.110:E / AndroidRuntime(4493):at com.example.usapp.Settings.onCreate(Settings.java:37)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
01-23 13:10:32.110:E / AndroidRuntime(4493):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1715)
01-23 13:10:32.110:E / AndroidRuntime(4493):... 11更多
Java类
package com.example.usapp;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Handler;
import android.util.Log;
public class Stream extends AsyncTask<Void, Void, Void>{
Bitmap image;
int frameCounter=0;
int checkCounterFPS=0;
long lastFpsTime=0;
double FPS;
protected Handler handler_bitmap, handlerdata;
boolean firstSetOfFPS=false;
double availableFPS;
double toleranceValue;
boolean firstFalseFPS = false;
byte[] datainput = new byte[1024];
Socket socket;
@Override
protected Void doInBackground(Void... params) {
Log.i("DUPA","po String doInBackground(String... params) ");
try {
Log.i("DUPA","przed socket");
socket = new Socket();
InetSocketAddress adres = new InetSocketAddress("192.168.1.50", 4444);
//adres.
socket.connect(adres);
//socket = new Socket("192.168.1.50", 4444);
Log.i("DUPA","po socket");
BufferedInputStream in = new BufferedInputStream(socket.getInputStream());
Log.i("DUPA","po socketconnected ");
/*
do {
try {
ByteBuffer buffer = ByteBuffer.allocate(9);
in.read(buffer.array());
byte[] bBuffer = new byte[9];
buffer.get(bBuffer, 0, 9);
int len = Integer.parseInt(new String(bBuffer,"US-ASCII"));
int bytesRecieved = 0;
ByteBuffer completeBuf;
completeBuf = ByteBuffer.allocate(len);
while (len > bytesRecieved) {
int inSize = in.available();
if (inSize > len- bytesRecieved) {
buffer = ByteBuffer.allocate(len- bytesRecieved);
bytesRecieved += len- bytesRecieved;
in.read(buffer.array());
completeBuf.put(buffer);
} else {
bytesRecieved += inSize;
buffer = ByteBuffer.allocate(inSize);
in.read(buffer.array());
completeBuf.put(buffer);
}
}
frameCounter++;
long delay = (long) (System.currentTimeMillis() - lastFpsTime);
if (delay > 1000) {
checkCounterFPS++;
FPS = (((double) frameCounter) / delay) * 1000;
handler_bitmap.post(new Runnable() {
public void run() {
///usunieto fps set text
}
});
frameCounter = 0;
lastFpsTime = System.currentTimeMillis();
}
if (checkCounterFPS >= 3 && firstSetOfFPS == true) {
checkCounterFPS = 0;
if (FPS <= ((double) availableFPS - toleranceValue)
|| FPS >= ((double) availableFPS + toleranceValue)) {
firstFalseFPS = true;
}
} else if (firstFalseFPS == true) {
if (FPS <= ((double) availableFPS - toleranceValue)
|| FPS >= ((double) availableFPS + toleranceValue)) {
// setSendText("FPS",(int) FPS);
firstFalseFPS = false;
}
}
//publishProgress(completeBuf);
} catch (NumberFormatException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.i("DUPA","blad1");
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.i("DUPA","blad2");
}
} while (!socket.isInputShutdown() && !socket.isClosed()); //
// publishProgress("Status: Closed".getBytes());*/
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.i("DUPA","blad3");
}
Log.i("AsyncTask", "doInBackground: Finished");
return null;
}
protected Bitmap onProgressUpdate(ByteBuffer... values) {
Log.i("DUPA","blad4");
return image = BitmapFactory.decodeByteArray(values[0].array(), 0,values[0].array().length);
}
}
答案 0 :(得分:1)
正如其他人正确指出的那样,自从Honeycomb及更高版本以来,android不允许在主UI线程上进行网络操作。我可以看到你创建了一个扩展AsyncTask的类,这是android为后台操作提供的一个特殊类。您需要创建一个单独的活动并从中触发AsyncTask。这样,doInBackground()
中的代码将在单独的线程中执行,并且不会阻止您的主要活动。
例如,您可以将Stream
类作为另一个活动的内部类添加以下代码到活动的onCreate()
方法
Stream task = new Stream();
task.execute();
答案 1 :(得分:0)
正如@ pingw33n在他的演讲中提到的,Android网络连接必须在AsyncTask线程中完成,而不是在主线程中完成。这适用于较旧版本的android,但在最新版本中,您的网络连接无法在主线程中完成。