Interface to communicate from settings to privacy feature.

app/src/main/java/com/nmc/android/ui/PrivacySettingsInterface.kt

@@ -0,0 +1,13 @@
+package com.nmc.android.ui
+
+import android.content.Context
+
+/**
+ * interface to open privacy settings activity from nmc/1921-settings branch
+ * for implementation look nmc/1878-privacy branch
+ * this class will have the declaration for it since it has the PrivacySettingsActivity.java in place
+ * since we don't have privacy settings functionality in this branch so to handle the redirection we have used interface
+ */
+interface PrivacySettingsInterface {
+    fun openPrivacySettingsActivity(context: Context)
+}

app/src/main/java/com/nmc/android/ui/PrivacySettingsInterfaceImpl.kt

@@ -0,0 +1,14 @@
+package com.nmc.android.ui
+
+import android.content.Context
+
+/**
+ * interface impl to launch PrivacySettings Activity
+ * this class will have the implementation for it since it has the PrivacySettingsActivity in place
+ * calling of this method will be done from nmc/1921-settings
+ */
+class PrivacySettingsInterfaceImpl : PrivacySettingsInterface {
+    override fun openPrivacySettingsActivity(context: Context) {
+        PrivacySettingsActivity.openPrivacySettingsActivity(context, false)
+    }
+}

app/src/main/java/com/owncloud/android/ui/activity/SettingsActivity.java

@@ -59,6 +59,8 @@
 import com.nextcloud.client.preferences.AppPreferences;
 import com.nextcloud.client.preferences.AppPreferencesImpl;
 import com.nextcloud.client.preferences.DarkMode;
+import com.nmc.android.ui.PrivacySettingsInterface;
+import com.nmc.android.ui.PrivacySettingsInterfaceImpl;
 import com.owncloud.android.BuildConfig;
 import com.owncloud.android.MainApp;
 import com.owncloud.android.R;
@@ -149,6 +151,16 @@ public class SettingsActivity extends PreferenceActivity
     @Inject ClientFactory clientFactory;
     @Inject ViewThemeUtils viewThemeUtils;
 
+    /**
+     * Things to note about both the branches.
+     * 1. nmc/1921-settings branch:
+     *    --> interface won't be initialised
+     *    -->  calling of interface method will be done here
+     * 2. nmc/1878-privacy
+     *    --> interface will be initialised
+     *    --> calling of interface method won't be done here
+     */
+    private PrivacySettingsInterface privacySettingsInterface;
 
     @SuppressWarnings("deprecation")
     @Override
@@ -159,6 +171,9 @@ public void onCreate(Bundle savedInstanceState) {
         getDelegate().onCreate(savedInstanceState);
         addPreferencesFromResource(R.xml.preferences);
 
+        //NMC customization will be initialised in nmc/1878-privacy
+        privacySettingsInterface = new PrivacySettingsInterfaceImpl();
+
         setupActionBar();
 
         // Register context menu for list of preferences.