fixed settings title change on frag transaction

app/src/main/java/net/headlezz/notificationlogger/BlacklistFragment.java

@@ -2,7 +2,6 @@ package net.headlezz.notificationlogger;
 
 import android.app.Activity;
 import android.support.v4.app.Fragment;
-import android.support.v7.app.AppCompatActivity;
 
 public class BlacklistFragment extends Fragment {
 
@@ -10,6 +9,5 @@ public class BlacklistFragment extends Fragment {
     @Override
     public void onAttach(Activity activity) {
         super.onAttach(activity);
-        ((AppCompatActivity) activity).getSupportActionBar().setTitle("Blacklist");
     }
 }

app/src/main/java/net/headlezz/notificationlogger/PreferenceActivity.java

@@ -26,10 +26,7 @@ public class PreferenceActivity extends AppCompatActivity implements PreferenceF
         getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 
         if(getSupportFragmentManager().findFragmentById(R.id.fragment_holder) == null) {
-            PreferenceFragment pf = new PreferenceFragment();
+            showSettingsScreen();
-            getSupportFragmentManager().beginTransaction()
-                    .add(R.id.fragment_holder, pf)
-                    .commit();
         }
     }
 
@@ -54,5 +51,20 @@ public class PreferenceActivity extends AppCompatActivity implements PreferenceF
                 .replace(R.id.fragment_holder, new BlacklistFragment())
                 .addToBackStack("blacklist")
                 .commit();
+        getSupportActionBar().setTitle(getString(R.string.title_blacklist));
+    }
+
+    public void showSettingsScreen() {
+        getSupportFragmentManager().beginTransaction()
+                .replace(R.id.fragment_holder, new PreferenceFragment())
+                .commit();
+        getSupportActionBar().setTitle(getString(R.string.title_settings));
+    }
+
+    @Override
+    public void onBackPressed() {
+        if(getSupportFragmentManager().getBackStackEntryCount() > 0)
+            getSupportActionBar().setTitle(getString(R.string.title_settings));
+        super.onBackPressed();
     }
 }

app/src/main/java/net/headlezz/notificationlogger/PreferenceFragment.java

@@ -44,7 +44,6 @@ public class PreferenceFragment extends PreferenceFragmentCompat implements Pref
     public void onAttach(Activity activity) {
         super.onAttach(activity);
         mCallbacks = (PreferenceCallbacks) activity;
-        ((AppCompatActivity) activity).getSupportActionBar().setTitle("Settings");
     }
 
     @Override

app/src/main/res/values/strings.xml

@@ -15,4 +15,5 @@
     <string name="pref_about_title">About</string>
     <string name="fab_cd_create_notification">FAB: Create notification</string>
     <string name="title_create_notification">Create notification</string>
+    <string name="title_blacklist">Blacklist</string>
 </resources>