Socket EACCESS permission denied with Android Studio - android-studio

Question

I am trying to connect my android emulator to my host computer with socket connection.
I have a simple Java server running and lessening in the host on port 6789.
I have the following code:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Declares streamText to refer to text area to show all messages
TextView streamText = ((TextView) findViewById(R.id.streamText));
streamText.setText("");
streamText.append("Attempting connection at " + serverIP + " : 6789 \n");
try {
connection = new Socket(InetAddress.getByName(serverIP), 6789); // WHAT IP to connect to host, not virtual device host
streamText.append("Connected to: " + connection.getInetAddress().getHostAddress());
}catch(IOException Exception){
streamText.append(Exception.toString());
Exception.printStackTrace();
}
}
And i am getting this error on logcat:
02-05 11:46:52.257 2663-2663/net.ruiruivo.myfirstapp.chatclientv1 E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: net.ruiruivo.myfirstapp.chatclientv1, PID: 2663
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{net.ruiruivo.myfirstapp.chatclientv1/net.ruiruivo.myfirstapp.chatclientv1.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
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)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.Window.findViewById(int)' on a null object reference
at android.app.Activity.findViewById(Activity.java:2071)
at net.ruiruivo.myfirstapp.chatclientv1.MainActivity.<init>(MainActivity.java:33)
at java.lang.reflect.Constructor.newInstance(Native Method)
at java.lang.Class.newInstance(Class.java:1572)
at android.app.Instrumentation.newActivity(Instrumentation.java:1065)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2199)
          
And inside my textView window the Exception Says:
java.net.SocketException: socket failed: EACCES (Permission denied)
I have search this and other sites, the answered that appeared the closest to this was <permission android:name="android.permission.INTERNET"></permission> in my manifest but did not solved the problem.
Can anyone help?

Answer 1

Your problem is somewhere else.
1.) post your XML file because it seems that you run into a NPE because streamText is null
2.) You can not do network code in the main thread - this will cause a
android.os.NetworkOnMainThreadException
You have to implement a separate task for that, e.g.:
private class NetworkTask extends AsyncTask<Void, Void, Object>{...}
Update:
Here you go:
#Override
protected void onCreate(Bundle savedInstanceState) {
//your code
new NetworkTask().execute();
}
private class NetworkTask extends AsyncTask<Void, Void, Object>{
#Override
protected Object doInBackground(Void... v) {
try {
//do your network stuff here
return "";
}
catch (HttpException e) {
return e;
}
}
// onPostExecute displays the results of the AsyncTask.
#Override
protected void onPostExecute(Object result) {
if(result instanceof String){
//everything was fine
}
else{
if(((HttpException)result).getMessage()!=null){
//exception occured
}
}
}
}