fix proxy settings

app/src/main/java/com/keylesspalace/tusky/fragment/PreferencesFragment.java

@@ -284,13 +284,20 @@ public class PreferencesFragment extends PreferenceFragment implements SharedPre
             Boolean httpProxyEnabled = sharedPreferences.getBoolean("httpProxyEnabled", false);
 
             String httpServer = sharedPreferences.getString("httpProxyServer", "");
+
+            try {
                 int httpPort = Integer.parseInt(sharedPreferences.getString("httpProxyPort", "-1"));
 
                 if (httpProxyEnabled && !httpServer.isEmpty() && (httpPort > 0 && httpPort < 65535)) {
                     httpProxyPref.setSummary(httpServer + ":" + httpPort);
-            } else {
+                    return;
-                httpProxyPref.setSummary("");
                 }
+            } catch (NumberFormatException e) {
+                // user has entered wrong port, fall back to empty summary
+            }
+
+            httpProxyPref.setSummary("");
+
         }
     }
 }

app/src/main/java/com/keylesspalace/tusky/util/OkHttpUtils.java

@@ -71,10 +71,15 @@ public class OkHttpUtils {
 
         SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
 
-
         boolean httpProxyEnabled = preferences.getBoolean("httpProxyEnabled", false);
         String httpServer = preferences.getString("httpProxyServer", "");
-        int httpPort = Integer.parseInt(preferences.getString("httpProxyPort", "-1"));
+        int httpPort;
+        try {
+            httpPort = Integer.parseInt(preferences.getString("httpProxyPort", "-1"));
+        } catch (NumberFormatException e) {
+            // user has entered wrong port, fall back to no proxy
+            httpPort = -1;
+        }
 
         ConnectionSpec fallback = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
                 .allEnabledCipherSuites()