Add an option to use a bottom app bar. https://redmine.stoutner.com/issues/749

[PrivacyCell.git] / app / src / main / java / com / stoutner / privacycell / fragments / SettingsFragment.kt

diff --git a/app/src/main/java/com/stoutner/privacycell/fragments/SettingsFragment.kt b/app/src/main/java/com/stoutner/privacycell/fragments/SettingsFragment.kt
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index 0000000..0cf6c6f
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+++ b/app/src/main/java/com/stoutner/privacycell/fragments/SettingsFragment.kt
@@ -0,0 +1,122 @@
+/*
+ * Copyright © 2021 Soren Stoutner <soren@stoutner.com>.
+ *
+ * This file is part of Privacy Cell <https://www.stoutner.com/privacy-cell>.
+ *
+ * Privacy Cell is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Privacy Cell is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Privacy Cell.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.stoutner.privacycell.fragments
+
+import android.content.Intent
+import android.content.SharedPreferences
+import android.os.Bundle
+import android.os.Handler
+import android.os.Looper
+
+import androidx.preference.Preference
+import androidx.preference.PreferenceFragmentCompat
+
+import com.stoutner.privacycell.R
+
+class SettingsFragment : PreferenceFragmentCompat() {
+    // Declare the class variables.
+    private lateinit var sharedPreferenceChangeListener: SharedPreferences.OnSharedPreferenceChangeListener
+
+    // Declare the class views.
+    private lateinit var bottomAppBarPreference: Preference
+
+    override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
+        // Load the preferences from the XML file.
+        setPreferencesFromResource(R.xml.preferences, rootKey)
+
+        // Get a handle for the shared preferences.
+        val sharedPreferences = preferenceScreen.sharedPreferences
+
+        // Get handles for the preferences.
+        bottomAppBarPreference = findPreference(getString(R.string.bottom_app_bar_key))!!
+
+        // Set the bottom app bar preference icon.
+        if (sharedPreferences.getBoolean(getString(R.string.bottom_app_bar_key), false)) {
+            // Set the enabled icon.
+            bottomAppBarPreference.setIcon(R.drawable.bottom_app_bar_enabled)
+        } else {
+            // Set the disabled icon.
+            bottomAppBarPreference.setIcon(R.drawable.bottom_app_bar_disabled)
+        }
+    }
+
+    // The listener should be unregistered when the app is paused.
+    override fun onPause() {
+        // Run the default commands.
+        super.onPause()
+
+        // Get a handle for the shared preferences.
+        val sharedPreferences = preferenceScreen.sharedPreferences
+
+        // Unregister the shared preference listener.
+        sharedPreferences.unregisterOnSharedPreferenceChangeListener(sharedPreferenceChangeListener)
+    }
+
+    // The listener should be re-registered when the app is resumed.
+    override fun onResume() {
+        // Run the default commands.
+        super.onResume()
+
+        // Get a new shared preference change listener.
+        sharedPreferenceChangeListener = getSharedPreferenceChangeListener()
+
+        // Get a handle for the shared preferences.
+        val sharedPreferences = preferenceScreen.sharedPreferences
+
+        // Re-register the shared preference listener.
+        sharedPreferences.registerOnSharedPreferenceChangeListener(sharedPreferenceChangeListener)
+    }
+
+    private fun getSharedPreferenceChangeListener(): SharedPreferences.OnSharedPreferenceChangeListener {
+        // Return the shared preference change listener.
+        return SharedPreferences.OnSharedPreferenceChangeListener {sharedPreferences, key ->
+            when (key) {
+                "bottom_app_bar" -> {
+                    // Update the icon.
+                    if (sharedPreferences.getBoolean(getString(R.string.bottom_app_bar_key), false)) {
+                        // Set the enabled icon.
+                        bottomAppBarPreference.setIcon(R.drawable.bottom_app_bar_enabled)
+                    } else {
+                        // Set the disabled icon.
+                        bottomAppBarPreference.setIcon(R.drawable.bottom_app_bar_disabled)
+                    }
+
+                    // Create an intent to restart Privacy Cell.
+                    val restartIntent = requireActivity().parentActivityIntent!!
+
+                    // `Intent.FLAG_ACTIVITY_CLEAR_TASK` removes all activities from the stack.  It requires `Intent.FLAG_ACTIVITY_NEW_TASK`.
+                    restartIntent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
+
+                    // Create a handler to restart the activity.
+                    val restartHandler = Handler(Looper.getMainLooper())
+
+                    // Create a runnable to restart the activity.
+                    val restartRunnable = Runnable {
+                        // Restart the activity.
+                        startActivity(restartIntent)
+                    }
+
+                    // Restart the activity after 400 milliseconds, so that the app has enough time to save the change to the preference.
+                    restartHandler.postDelayed(restartRunnable, 400)
+                }
+            }
+        }
+    }
+}
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