I can't send a post request and get a response, how to fix it?

Question

Java

I send (post) request through android, I get an error. Here is the error logcat:
06-13 15:59:31.917 19584-19584/ux.project.chat.uchat E/AndroidRuntime﹕ FATAL EXCEPTION: main
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java :1128)
at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
at java.net.InetAddress.getAllByName(InetAddress.java:214)
at org .apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
org.apache.http.impl .client.DefaultRequestDirector.execute(DefaultRequestDirector.java:365)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient .java:653)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
at ux.project.chat.uchat.MainActivity.onOptionsItemSelected(MainActivity.java:78) at
android.app.Activity.onMenuItemSelected(Activity.java:2566)
:353)
at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:144)
at android.support.v7.internal.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:99)
at android.support.v7. app.AppCompatDelegateImplV7.onMenuItemSelected(AppCompatDelegateImplV7.java:541)
at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811)
at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153)
at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958)
at android.support .v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:948)
at android.support.v7.internal.view.menu.MenuPopupHelper.onItemClick(MenuPopupHelper.java:187)
at android.widget.AdapterView.performItemClick (AdapterView.java:298)
at android.widget.AbsListView.performItemClick(AbsListView.java:1128)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:2812)
at android.widget.AbsListView$1.run(AbsListView .java:3571)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:153)
at android.app. ActivityThread.main(ActivityThread.java:5299)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os. ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
Here is the code:
HttpClient httpclient = new DefaultHttpClient();
HttpPost http = new HttpPost(address);
List nameValuePairs = new ArrayList(2);
nameValuePairs.add(new BasicNameValuePair("login", "user1"));
nameValuePairs.add(new BasicNameValuePair("pswd", "1234"));
String responses="no";
try {
http.setEntity(new UrlEncodedFormEntity(nameValuePairs));
responses = httpclient.execute(http, new BasicResponseHandler());
} catch (IOException e) {
e.printStackTrace();
}
Toast toast = Toast.makeText(getApplicationContext(), responses, Toast.LENGTH_SHORT);
toast.
There is Internet permission:
How to fix the application crash and get the result through a post request to the site?