Bump app version number

app/build.gradle

@@ -7,8 +7,8 @@ android {
     defaultConfig {
         minSdkVersion 3
         targetSdkVersion 25
-        versionCode 35
-        versionName '4.2'
+        versionCode 36
+        versionName '4.3'
     }
 
     lintOptions {

app/src/main/java/org/traccar/client/MainActivity.java

@@ -119,6 +119,23 @@ public class MainActivity extends PreferenceActivity implements OnSharedPreferen
             }
         });
 
+        Preference.OnPreferenceChangeListener numberValidationListener = new Preference.OnPreferenceChangeListener() {
+            @Override
+            public boolean onPreferenceChange(Preference preference, Object newValue) {
+                if (newValue != null) {
+                    try {
+                        int value = Integer.parseInt((String) newValue);
+                        return value >= 0;
+                    } catch (NumberFormatException e) {
+                        Log.w(TAG, e);
+                    }
+                }
+                return false;
+            }
+        };
+        findPreference(KEY_DISTANCE).setOnPreferenceChangeListener(numberValidationListener);
+        findPreference(KEY_ANGLE).setOnPreferenceChangeListener(numberValidationListener);
+
         alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
         alarmIntent = PendingIntent.getBroadcast(this, 0, new Intent(this, AutostartReceiver.class), 0);
 

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

@@ -33,6 +33,9 @@
   <string name="settings_provider_mixed">Mixed provider</string>
   <string name="settings_foreground_title">Foreground service</string>
   <string name="settings_foreground_summary">Increase service priority</string>
+  <string name="error_invalid_address">Invalid server address</string>
+  <string name="error_invalid_port">Invalid server port</string>
+  <string name="error_invalid_frequency">Invalid frequency value</string>
   <string name="menu_status">Status</string>
   <string name="menu_about">About</string>
   <string name="menu_shortcuts">Add shortcuts</string>