我已经用Java创建了一个客户端和服务器程序，通过网络控制我的PC并且一切正常。我现在正在将客户端更改为Android应用程序，并遇到打开套接字的问题。
外部方法：
private PrintWriter clientMessage;
private Socket socket;
private int port = 1234;
点击连接按钮：
try {
System.out.println("a");
InetAddress IP = InetAddress.getByName("192.168.0.12");
System.out.println("a");
System.out.println("b");
socket = new Socket(IP, port);
System.out.println("b");
connected = true;
System.out.println("connected");
clientMessage = new PrintWriter(socket.getOutputStream(), true);
}
catch (IOException ex) {
System.out.println("error connecting");
}
控制台返回：
12-07 23:59:50.812 I/System.out: a
12-07 23:59:50.812 D/libc: [NET] android_getaddrinfofornet+,hn 12(0x3139322e313638),sn(),hints(known),family 0,flags 4
12-07 23:59:50.812 D/libc: [NET] android_getaddrinfofornet-, SUCCESS
12-07 23:59:50.812 I/System.out: a
12-07 23:59:50.812 I/System.out: b
12-07 23:59:50.812 I/System.out: error connecting
...单击连接按钮。从a / b标记我可以看到创建套接字时出现问题。
这个代码几乎就是我在客户端用作Java应用程序时使用的代码，所以不确定这里出了什么问题？
对Android来说很新，很抱歉，如果它很明显 - 提前感谢！
注意：服务器的端口号和IP地址是正确的，服务器是打开并正常运行的，所以不是这样。
修改1：
抛出IOException的堆栈跟踪：
W/System.err: java.net.SocketException: socket failed: EACCES (Permission denied)
W/System.err: at libcore.io.IoBridge.socket(IoBridge.java:623)
W/System.err: at java.net.PlainSocketImpl.create(PlainSocketImpl.java:198)
W/System.err: at java.net.Socket.startupSocket(Socket.java:582)
W/System.err: at java.net.Socket.<init>(Socket.java:226)
W/System.err: at kaihulme.remoteapplication.MainActivity.onClick(MainActivity.java:80)
W/System.err: at android.view.View.performClick(View.java:4756)
W/System.err: at android.view.View$PerformClick.run(View.java:19749)
W/System.err: at android.os.Handler.handleCallback(Handler.java:739)
W/System.err: at android.os.Handler.dispatchMessage(Handler.java:95)
W/System.err: at android.os.Looper.loop(Looper.java:135)
W/System.err: at android.app.ActivityThread.main(ActivityThread.java:5221)
W/System.err: at java.lang.reflect.Method.invoke(Native Method)
W/System.err: at java.lang.reflect.Method.invoke(Method.java:372)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
W/System.err: Caused by: android.system.ErrnoException: socket failed: EACCES (Permission denied)
W/System.err: at libcore.io.Posix.socket(Native Method)
W/System.err: at libcore.io.BlockGuardOs.socket(BlockGuardOs.java:282)
W/System.err: at libcore.io.IoBridge.socket(IoBridge.java:608)
W/System.err: ... 14 more
编辑2：
添加了权限：
<uses-permission android:name="android.permission.INTERNET"/>
...在查看Error message 'java.net.SocketException: socket failed: EACCES (Permission denied)'后收到Android清单并收到以下错误：
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: kaihulme.remoteapplication, PID: 24959
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110)
at libcore.io.IoBridge.connectErrno(IoBridge.java:137)
at libcore.io.IoBridge.connect(IoBridge.java:122)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:163)
at java.net.Socket.startupSocket(Socket.java:590)
at java.net.Socket.<init>(Socket.java:226)
at kaihulme.remoteapplication.MainActivity.onClick(MainActivity.java:80)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
I/Process: Sending signal. PID: 24959 SIG: 9
编辑3：
的AndroidManifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="kaihulme.remoteapplication">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".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>