我已经开始学习网络，并且一直在开发一个 android 应用程序来测试我所学到的东西。现在，我一直在关注网络上的教程，但似乎发生了一些奇怪的事情。当我包含互联网权限时，该程序有一个致命异常，但当我不包含它时，它会给我一个 EACCES denied 错误。
这是我的代码（请记住，我很多人只是在试验和尝试）：
package com.test.sockettest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.List;
import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends Activity {
public static final int TEST = 0;
public static final int SERVER_PORT = 11235;
TextView conversation;
EditText messageInput;
Button sendButton;
ServerSocket servSock;
List<Socket> outputs;
Thread serverThread, clientThread;
Handler conersationUpdater;
String ipString;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
init();
} catch (IOException e) {
Log.d("SOCKET", "1" + e.toString());
e.printStackTrace();
}
}
private void init() throws IOException {
findViewsById();
serverThread = new Thread(new Server());
askForIp();
connect();
}
private void findViewsById() {
conversation = (TextView) findViewById(R.id.conversation);
messageInput = (EditText) findViewById(R.id.messageInput);
sendButton = (Button) findViewById(R.id.sendButton);
}
class Server implements Runnable {
@Override
public void run() {
Socket inputSock = null;
try {
servSock = new ServerSocket(SERVER_PORT);
} catch (Exception e) {
Log.d("SOCKET", "2" + e.toString());
}
while (!Thread.currentThread().isInterrupted()) {
try {
inputSock = servSock.accept();
Input in = new Input(inputSock);
new Thread(in).start();
outputs.add(new Socket(inputSock.getInetAddress(),
inputSock.getPort()));
} catch (Exception e) {
Log.d("SOCKET", "3" + e.toString());
}
}
}
}
class Input implements Runnable {
private BufferedReader in;
public Input(Socket socket) {
try {
in = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
} catch (Exception e) {
Log.d("SOCKET", "4" + e.toString());
}
}
public void run() {
while (!Thread.currentThread().isInterrupted()) {
try {
String read = in.readLine();
conersationUpdater.post(new Update(read));
} catch (Exception e) {
Log.d("SOCKET", "5" + e.toString());
}
}
}
}
class Update implements Runnable {
private String msg;
public Update(String read) {
msg = read;
}
public void run() {
conversation
.setText(conversation.getText().toString() + msg + "\n");
}
}
private void connect() throws IOException {
InetAddress address = InetAddress.getByName(ipString);
outputs.add(new Socket(address, SERVER_PORT));
}
private void askForIp() {
final Dialog d = new Dialog(this);
d.setContentView(R.layout.connect_dialog_layout);
d.setTitle("Connect to IP...");
final EditText ip = (EditText) findViewById(R.id.connectDialogIpBox);
Button connect = (Button) findViewById(R.id.connectDialogButton);
try {
connect.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
ipString = ip.getText().toString();
d.dismiss();
}
});
} catch (Exception e) {
Log.d("SOCKET", "11" + e.toString());
}
d.show();
}
@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;
}
}
这是两个不同的清单文件：
1：
<uses-sdk
android:minSdkVersion="13"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.test.sockettest.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
2：
<uses-sdk
android:minSdkVersion="13"
android:targetSdkVersion="17" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.test.sockettest.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
最后，两个错误日志：
1：
10-10 18:44:26.327: D/dalvikvm(32189): Late-enabling CheckJNI
10-10 18:44:26.517: D/SOCKET(32189): 11java.lang.NullPointerException
10-10 18:44:26.537: D/AndroidRuntime(32189): Shutting down VM
10-10 18:44:26.537: W/dalvikvm(32189): threadid=1: thread exiting with uncaught exception (group=0x41eec7c0)
10-10 18:44:26.537: E/AndroidRuntime(32189): FATAL EXCEPTION: main
10-10 18:44:26.537: E/AndroidRuntime(32189): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.sockettest/com.test.sockettest.MainActivity}: android.os.NetworkOnMainThreadException
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2280)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2330)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.ActivityThread.access$700(ActivityThread.java:154)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1306)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.os.Handler.dispatchMessage(Handler.java:99)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.os.Looper.loop(Looper.java:137)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.ActivityThread.main(ActivityThread.java:5368)
10-10 18:44:26.537: E/AndroidRuntime(32189): at java.lang.reflect.Method.invokeNative(Native Method)
10-10 18:44:26.537: E/AndroidRuntime(32189): at java.lang.reflect.Method.invoke(Method.java:525)
10-10 18:44:26.537: E/AndroidRuntime(32189): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
10-10 18:44:26.537: E/AndroidRuntime(32189): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
10-10 18:44:26.537: E/AndroidRuntime(32189): at dalvik.system.NativeStart.main(Native Method)
10-10 18:44:26.537: E/AndroidRuntime(32189): Caused by: android.os.NetworkOnMainThreadException
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1144)
10-10 18:44:26.537: E/AndroidRuntime(32189): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
10-10 18:44:26.537: E/AndroidRuntime(32189): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
10-10 18:44:26.537: E/AndroidRuntime(32189): at libcore.io.IoBridge.connect(IoBridge.java:112)
10-10 18:44:26.537: E/AndroidRuntime(32189): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
10-10 18:44:26.537: E/AndroidRuntime(32189): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
10-10 18:44:26.537: E/AndroidRuntime(32189): at java.net.Socket.startupSocket(Socket.java:566)
10-10 18:44:26.537: E/AndroidRuntime(32189): at java.net.Socket.<init>(Socket.java:225)
10-10 18:44:26.537: E/AndroidRuntime(32189): at com.test.sockettest.MainActivity.connect(MainActivity.java:134)
10-10 18:44:26.537: E/AndroidRuntime(32189): at com.test.sockettest.MainActivity.init(MainActivity.java:57)
10-10 18:44:26.537: E/AndroidRuntime(32189): at com.test.sockettest.MainActivity.onCreate(MainActivity.java:45)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.Activity.performCreate(Activity.java:5284)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
10-10 18:44:26.537: E/AndroidRuntime(32189): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2244)
10-10 18:44:26.537: E/AndroidRuntime(32189): ... 11 more
2：
10-11 18:41:19.694: D/SOCKET(2086): 11java.lang.NullPointerException
10-11 18:41:19.704: D/SOCKET(2086): 1java.net.SocketException: socket failed: EACCES (Permission denied)
10-11 18:41:19.704: W/System.err(2086): java.net.SocketException: socket failed: EACCES (Permission denied)
10-11 18:41:19.714: W/System.err(2086): at libcore.io.IoBridge.socket(IoBridge.java:576)
10-11 18:41:19.714: W/System.err(2086): at java.net.PlainSocketImpl.create(PlainSocketImpl.java:201)
10-11 18:41:19.714: W/System.err(2086): at java.net.Socket.startupSocket(Socket.java:559)
10-11 18:41:19.714: W/System.err(2086): at java.net.Socket.<init>(Socket.java:225)
10-11 18:41:19.714: W/System.err(2086): at com.test.sockettest.MainActivity.connect(MainActivity.java:132)
10-11 18:41:19.714: W/System.err(2086): at com.test.sockettest.MainActivity.init(MainActivity.java:55)
10-11 18:41:19.714: W/System.err(2086): at com.test.sockettest.MainActivity.onCreate(MainActivity.java:43)
10-11 18:41:19.714: W/System.err(2086): at android.app.Activity.performCreate(Activity.java:5284)
10-11 18:41:19.714: W/System.err(2086): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
10-11 18:41:19.714: W/System.err(2086): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2244)
10-11 18:41:19.714: W/System.err(2086): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2330)
10-11 18:41:19.714: W/System.err(2086): at android.app.ActivityThread.access$700(ActivityThread.java:154)
10-11 18:41:19.714: W/System.err(2086): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1306)
10-11 18:41:19.714: W/System.err(2086): at android.os.Handler.dispatchMessage(Handler.java:99)
10-11 18:41:19.714: W/System.err(2086): at android.os.Looper.loop(Looper.java:137)
10-11 18:41:19.714: W/System.err(2086): at android.app.ActivityThread.main(ActivityThread.java:5368)
10-11 18:41:19.714: W/System.err(2086): at java.lang.reflect.Method.invokeNative(Native Method)
10-11 18:41:19.714: W/System.err(2086): at java.lang.reflect.Method.invoke(Method.java:525)
10-11 18:41:19.714: W/System.err(2086): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
10-11 18:41:19.714: W/System.err(2086): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
10-11 18:41:19.714: W/System.err(2086): at dalvik.system.NativeStart.main(Native Method)
10-11 18:41:19.714: W/System.err(2086): Caused by: libcore.io.ErrnoException: socket failed: EACCES (Permission denied)
10-11 18:41:19.714: W/System.err(2086): at libcore.io.Posix.socket(Native Method)
10-11 18:41:19.714: W/System.err(2086): at libcore.io.BlockGuardOs.socket(BlockGuardOs.java:181)
10-11 18:41:19.714: W/System.err(2086): at libcore.io.IoBridge.socket(IoBridge.java:561)
10-11 18:41:19.714: W/System.err(2086): ... 20 more
有什么想法吗？