fixes #648

app/src/main/java/chat/rocket/android/activity/LoginActivity.java

@@ -9,6 +9,7 @@ import android.support.v4.app.Fragment;
 import chat.rocket.android.R;
 import chat.rocket.android.fragment.server_config.LoginFragment;
 import chat.rocket.android.fragment.server_config.RetryLoginFragment;
+import chat.rocket.android.helper.BackStackHelper;
 import chat.rocket.android.service.ConnectivityManager;
 import chat.rocket.core.interactors.SessionInteractor;
 import chat.rocket.persistence.realm.repositories.RealmSessionRepository;
@@ -93,10 +94,15 @@ public class LoginActivity extends AbstractFragmentActivity implements LoginCont
 
     @Override
     protected boolean onBackPress() {
-        LoginFragment loginFragment = (LoginFragment) getSupportFragmentManager()
-                .findFragmentById(getLayoutContainerForFragment());
-        Context loginActivityContext = this;
-        loginFragment.goBack(loginActivityContext);
+        if (BackStackHelper.FRAGMENT_TAG.equals("internal")) {
+            super.onBackPress();
+            BackStackHelper.FRAGMENT_TAG = "login";
+        } else if (BackStackHelper.FRAGMENT_TAG.equals("login")) {
+            LoginFragment loginFragment = (LoginFragment) getSupportFragmentManager()
+                    .findFragmentById(getLayoutContainerForFragment());
+            Context loginActivityContext = this;
+            loginFragment.goBack(loginActivityContext);
+        }
         return true;
     }
 }

app/src/main/java/chat/rocket/android/fragment/server_config/AbstractServerConfigFragment.java

@@ -6,39 +6,41 @@ import android.support.v4.app.Fragment;
 
 import chat.rocket.android.R;
 import chat.rocket.android.fragment.AbstractFragment;
+import chat.rocket.android.helper.BackStackHelper;
 import chat.rocket.android.helper.TextUtils;
 
 public abstract class AbstractServerConfigFragment extends AbstractFragment {
-  public static final String KEY_HOSTNAME = "hostname";
+    public static final String KEY_HOSTNAME = "hostname";
 
-  protected String hostname;
+    protected String hostname;
 
-  @Override
-  public void onCreate(@Nullable Bundle savedInstanceState) {
-    super.onCreate(savedInstanceState);
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
 
-    Bundle args = getArguments();
-    if (args == null) {
-      finish();
-      return;
+        Bundle args = getArguments();
+        if (args == null) {
+            finish();
+            return;
+        }
+
+        hostname = args.getString(KEY_HOSTNAME);
+        if (TextUtils.isEmpty(hostname)) {
+            finish();
+        }
     }
 
-    hostname = args.getString(KEY_HOSTNAME);
-    if (TextUtils.isEmpty(hostname)) {
-      finish();
+    protected void showFragment(Fragment fragment) {
+        getFragmentManager().beginTransaction()
+                .add(R.id.content, fragment)
+                .commit();
+    }   
+
+    protected void showFragmentWithBackStack(Fragment fragment) {
+        BackStackHelper.FRAGMENT_TAG = "internal";
+        getFragmentManager().beginTransaction()
+                .add(R.id.content, fragment)
+                .addToBackStack(null)
+                .commit();
     }
-  }
-
-  protected void showFragment(Fragment fragment) {
-    getFragmentManager().beginTransaction()
-        .add(R.id.content, fragment)
-        .commit();
-  }
-
-  protected void showFragmentWithBackStack(Fragment fragment) {
-    getFragmentManager().beginTransaction()
-        .add(R.id.content, fragment)
-        .addToBackStack(null)
-        .commit();
-  }
 }

app/src/main/java/chat/rocket/android/helper/BackStackHelper.java

+package chat.rocket.android.helper;
+
+/**
+ * Created by whocares on 28/12/17.
+ */
+
+public class BackStackHelper {
+    public static String FRAGMENT_TAG = "login";
+}