Allow users to clear locally stored donation history

app/src/main/java/org/wikipedia/settings/SettingsPreferenceLoader.kt

@@ -76,6 +76,10 @@ internal class SettingsPreferenceLoader(fragment: PreferenceFragmentCompat) : Ba
             loadPreferences(R.xml.preferences_account)
             (findPreference(R.string.preference_key_logout) as LogoutPreference).activity = activity
         }
+
+        if (shouldShowDeleteLocalDonationHistoryPreference) {
+            deleteLocalDonationHistory()
+        }
     }
 
     private fun deviceInformation(): String {
@@ -90,6 +94,20 @@ internal class SettingsPreferenceLoader(fragment: PreferenceFragmentCompat) : Ba
         }
     }
 
+    private val shouldShowDeleteLocalDonationHistoryPreference get() = Prefs.donationResults.isNotEmpty()
+
+    private fun deleteLocalDonationHistory() {
+        findPreference(R.string.preference_key_delete_local_donation_history).let {
+            it.isVisible = true
+            it.onPreferenceClickListener = Preference.OnPreferenceClickListener { preference ->
+                Prefs.donationResults = emptyList()
+                FeedbackUtil.showMessage(activity, R.string.donor_history_deleted_message_snackbar)
+                preference.isVisible = false
+                true
+            }
+        }
+    }
+
     fun updateLanguagePrefSummary() {
         // TODO: resolve RTL vs LTR with multiple languages (e.g. list contains English and Hebrew)
         findPreference(R.string.preference_key_language).summary = WikipediaApp.instance.languageState.appLanguageLocalizedNames

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

@@ -180,4 +180,5 @@
     <string name="preference_key_contributions_dashboard_survey_dialog_shown">contributionsDashboardSurveyDialogShown</string>
     <string name="preference_key_contributions_dashboard_entry_dialog_shown">contributionsDashboardEntryDialogShown</string>
     <string name="preference_key_current_selected_app_icon">currentSelectedAppIcon</string>
+    <string name="preference_key_delete_local_donation_history">deleteLocalDonationHistory</string>
 </resources>

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

@@ -420,6 +420,7 @@
     <string name="theme_chooser_dialog_image_dimming_switch_label">Image dimming (in Dark theme)</string>
     <string name="preference_title_prefer_offline_content">Prefer offline content</string>
     <string name="preference_summary_prefer_offline_content">Save data usage by loading articles that are available offline rather than always loading the latest version of an article</string>
+    <string name="preference_title_delete_local_donation_history">Delete local donation history</string>
     <string name="theme_chooser_dialog_match_system_theme_switch_label">Match system theme</string>
     <string name="page_footer_license_text">Content is available under $1 unless otherwise noted</string>
     <string name="empty_tab_title">New tab</string>
@@ -1789,6 +1790,7 @@
     <string name="donor_history_donate_button">Donate to the Wikimedia Foundation</string>
     <string name="donor_history_about_this_experiment">About this experiment</string>
     <string name="donor_history_updated_message_snackbar">Donor history updated</string>
+    <string name="donor_history_deleted_message_snackbar">Donor history deleted</string>
     <string name="contributions_dashboard_survey_dialog_title">Help improve the contributions dashboard</string>
     <string name="contributions_dashboard_survey_dialog_message">This update to the dashboard is a test feature. Would you like to see this feature improved or removed?</string>
     <string name="contributions_dashboard_survey_dialog_cancel">No opinion</string>

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

@@ -62,5 +62,10 @@
             android:defaultValue="false"
             android:title="@string/preference_title_prefer_offline_content"
             android:summary="@string/preference_summary_prefer_offline_content" />
+        <org.wikipedia.settings.PreferenceMultiLine
+            android:key="@string/preference_key_delete_local_donation_history"
+            android:defaultValue="0"
+            app:isPreferenceVisible="false"
+            android:title="@string/preference_title_delete_local_donation_history" />
     </PreferenceCategory>
 </PreferenceScreen>