Fixes #12 gpg update file summary

app/src/main/java/info/knacki/pass/settings/ui/SettingsActivity.java

@@ -32,9 +32,9 @@ import info.knacki.pass.git.entities.GitRef;
 import info.knacki.pass.io.FileUtils;
 import info.knacki.pass.io.PathUtils;
 import info.knacki.pass.settings.SettingsManager;
+import info.knacki.pass.ui.GitPullActivity;
 import info.knacki.pass.ui.alertPrompt.AlertPrompt;
 import info.knacki.pass.ui.alertPrompt.views.TextView;
-import info.knacki.pass.ui.GitPullActivity;
 
 /**
  * A {@link PreferenceActivity} that presents a set of application settings. On
@@ -477,6 +477,7 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
                     return true;
                 }
             });
+            updateGpgFileLabel();
         }
 
         @Override
@@ -487,9 +488,21 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
                     if (null != uriData) {
                         String path = uriData.getPath();
                         SettingsManager.SetGPGKeyFile(getActivity(), path);
+                        updateGpgFileLabel();
                     }
                 }
             }
         }
+
+        protected void updateGpgFileLabel() {
+            String gpgFileName = SettingsManager.GetGPGKeyFile(getActivity());
+            File gpgFile = gpgFileName == null ? null : new File(gpgFileName);
+
+            if (gpgFile != null && gpgFile.exists()) {
+                findPreference(getResources().getString(R.string.id_gpg_keyfile)).setSummary(gpgFile.getName());
+            } else {
+                findPreference(getResources().getString(R.string.id_gpg_keyfile)).setSummary(R.string.pref_summary_gpg_keyfile);
+            }
+        }
     }
 }