added option to hide seconds

app/src/main/java/de/jrpie/android/launcher/HomeActivity.kt

@@ -100,7 +100,16 @@ class HomeActivity: UIObject, AppCompatActivity(),
         val timeVisible = LauncherPreferences.clock().timeVisible()
 
         var dateFMT = "yyyy-MM-dd"
-        var timeFMT = "HH:mm:ss"
+        var timeFMT = "HH:mm"
+        var period = 100L
+        if (LauncherPreferences.clock().showSeconds()) {
+            timeFMT += ":ss"
+        }
+        /*
+         I thought about adding an option to show microseconds as well ( timeFMT += ".SSS" ).
+         However setting period ot 1L (or even 10L) causes high CPU load,
+         so that doesn't seem to be a good idea.
+         */
         if (LauncherPreferences.clock().localized()) {
             dateFMT = android.text.format.DateFormat.getBestDateTimePattern(locale, dateFMT)
             timeFMT = android.text.format.DateFormat.getBestDateTimePattern(locale, timeFMT)
@@ -119,7 +128,7 @@ class HomeActivity: UIObject, AppCompatActivity(),
         binding.homeUpperView.isVisible = upperVisible
         binding.homeLowerView.isVisible = lowerVisible
 
-        clockTimer = fixedRateTimer("clockTimer", true, 0L, 100) {
+        clockTimer = fixedRateTimer("clockTimer", true, 0L, period) {
             this@HomeActivity.runOnUiThread {
                 if (lowerVisible) {
                     val t = lowerFormat.format(Date())

app/src/main/java/de/jrpie/android/launcher/preferences/LauncherPreferences$Config.java

@@ -36,6 +36,7 @@ import eu.jonahbauer.android.preference.annotations.Preferences;
                 @Preference(name = "time_visible", type = boolean.class, defaultValue = "true"),
                 @Preference(name = "flip_date_time", type = boolean.class, defaultValue = "false"),
                 @Preference(name = "localized", type = boolean.class, defaultValue = "false"),
+                @Preference(name = "show_seconds", type = boolean.class, defaultValue = "true"),
             }),
             @PreferenceGroup(name = "display", prefix = "settings_display_", suffix = "_key", value = {
                 @Preference(name = "screen_timeout_disabled", type = boolean.class, defaultValue = "false"),

app/src/main/java/de/jrpie/android/launcher/settings/launcher/SettingsFragmentLauncher.kt

@@ -2,6 +2,7 @@ package de.jrpie.android.launcher.settings.launcher
 
 import android.content.Context
 import android.content.Intent
+import android.content.SharedPreferences
 import android.os.Bundle
 import androidx.preference.PreferenceFragmentCompat
 import de.jrpie.android.launcher.preferences.LauncherPreferences
@@ -16,10 +17,38 @@ import de.jrpie.android.launcher.setDefaultHomeScreen
  */
 class SettingsFragmentLauncher : PreferenceFragmentCompat() {
 
+
+    private var sharedPreferencesListener =
+        SharedPreferences.OnSharedPreferenceChangeListener { _, prefKey ->
+            if(prefKey?.startsWith("clock.") == true) {
+                updateVisibility()
+            }
+        }
+
+    private fun updateVisibility(){
+        val showSeconds = findPreference<androidx.preference.Preference>(
+            LauncherPreferences.clock().keys().showSeconds()
+        )
+        val timeVisible = LauncherPreferences.clock().timeVisible()
+        showSeconds?.isVisible = timeVisible
+    }
+
+    override fun onStart() {
+        super.onStart()
+        LauncherPreferences.getSharedPreferences().registerOnSharedPreferenceChangeListener(sharedPreferencesListener)
+    }
+
+    override fun onPause() {
+        LauncherPreferences.getSharedPreferences().unregisterOnSharedPreferenceChangeListener(sharedPreferencesListener)
+        super.onPause()
+    }
+
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         setPreferencesFromResource(R.xml.preferences, rootKey)
 
-        val selectWallpaper = findPreference<androidx.preference.Preference>(LauncherPreferences.theme().keys().wallpaper())
+        val selectWallpaper = findPreference<androidx.preference.Preference>(
+            LauncherPreferences.theme().keys().wallpaper()
+        )
         selectWallpaper?.setOnPreferenceClickListener {
             // https://github.com/LineageOS/android_packages_apps_Trebuchet/blob/6caab89b21b2b91f0a439e1fd8c4510dcb255819/src/com/android/launcher3/views/OptionsPopupView.java#L271
             val intent = Intent(Intent.ACTION_SET_WALLPAPER)
@@ -28,10 +57,13 @@ class SettingsFragmentLauncher : PreferenceFragmentCompat() {
             startActivity(intent)
             true
         }
-        val chooseHomeScreen = findPreference<androidx.preference.Preference>(LauncherPreferences.general().keys().chooseHomeScreen())
+        val chooseHomeScreen = findPreference<androidx.preference.Preference>(
+            LauncherPreferences.general().keys().chooseHomeScreen()
+        )
         chooseHomeScreen?.setOnPreferenceClickListener {
             setDefaultHomeScreen(requireContext(), checkDefault = false)
             true
         }
+        updateVisibility()
     }
 }

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

@@ -139,4 +139,5 @@
     <string name="ic_menu_alt">Mehr Optionen</string>
     <string name="list_other_expand_notifications_panel">Benachrichtigungen</string>
     <string name="alert_cant_expand_notifications_panel">Fehler: Die Funktion \"Benachrichtigungen\" wird von deinem Gerät leider nicht unterstützt.</string>
+    <string name="settings_clock_show_seconds">Sekunden anzeigen</string>
 </resources>

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

@@ -77,6 +77,7 @@
           -->
         <string name="settings_clock_font_key" translatable="false">clock.font</string>
         <string name="settings_clock_time_visible_key" translatable="false">clock.time_visible</string>
+        <string name="settings_clock_show_seconds_key" translatable="false">clock.show_seconds</string>
         <string name="settings_clock_date_visible_key" translatable="false">clock.date_visible</string>
         <string name="settings_clock_localized_key" translatable="false">clock.date_localized</string>
         <string name="settings_clock_flip_date_time_key" translatable="false">clock.date_time_flip</string>

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

@@ -93,6 +93,7 @@
     <string name="settings_clock_time_visible">Show time</string>
     <string name="settings_clock_date_visible">Show date</string>
     <string name="settings_clock_localized">Use localized date format</string>
+    <string name="settings_clock_show_seconds">Show seconds</string>
     <string name="settings_clock_flip_date_time">Flip date and time</string>
 
     <string name="settings_theme_wallpaper">Choose a wallpaper</string>

app/src/main/res/xml/preferences.xml

@@ -61,6 +61,10 @@
             android:key="@string/settings_clock_time_visible_key"
             android:defaultValue="true"
             android:title="@string/settings_clock_time_visible" />
+        <SwitchPreference
+            android:key="@string/settings_clock_show_seconds_key"
+            android:defaultValue="true"
+            android:title="@string/settings_clock_show_seconds" />
         <SwitchPreference
             android:key="@string/settings_clock_date_visible_key"
             android:defaultValue="true"