change sync interval on change in code

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/KeychainApplication.java

@@ -100,6 +100,11 @@ public class KeychainApplication extends Application {
         // Add OpenKeychain account to Android to link contacts with keys and keyserver sync
         createAccountIfNecessary(this);
 
+        if (Preferences.getKeyserverSyncEnabled(this)) {
+            // will update a keyserver sync if the interval has changed
+            KeyserverSyncAdapterService.enableKeyserverSync(this);
+        }
+
         // if first time, enable keyserver and contact sync
         if (Preferences.getPreferences(this).isFirstTime()) {
             KeyserverSyncAdapterService.enableKeyserverSync(this);

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/service/KeyserverSyncAdapterService.java

@@ -11,6 +11,7 @@ import android.content.ContentProviderClient;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
+import android.content.PeriodicSync;
 import android.content.SyncResult;
 import android.database.Cursor;
 import android.graphics.Bitmap;
@@ -529,6 +530,10 @@ public class KeyserverSyncAdapterService extends Service {
         return builder.build();
     }
 
+    /**
+     * creates a new sync if one does not exist, or updates an existing sync if the sync interval
+     * has changed.
+     */
     public static void enableKeyserverSync(Context context) {
         Account account = KeychainApplication.createAccountIfNecessary(context);
 
@@ -539,12 +544,26 @@ public class KeyserverSyncAdapterService extends Service {
 
         ContentResolver.setIsSyncable(account, Constants.PROVIDER_AUTHORITY, 1);
         ContentResolver.setSyncAutomatically(account, Constants.PROVIDER_AUTHORITY, true);
-        ContentResolver.addPeriodicSync(
+
-                account,
+        boolean intervalChanged = false;
-                Constants.PROVIDER_AUTHORITY,
+        boolean syncExists = Preferences.getKeyserverSyncEnabled(context);
-                new Bundle(),
+
-                SYNC_INTERVAL
+        if (syncExists) {
-        );
+            long oldInterval = ContentResolver.getPeriodicSyncs(
+                    account, Constants.PROVIDER_AUTHORITY).get(0).period;
+            if (oldInterval != SYNC_INTERVAL) {
+                intervalChanged = true;
+            }
+        }
+
+        if (!syncExists || intervalChanged) {
+            ContentResolver.addPeriodicSync(
+                    account,
+                    Constants.PROVIDER_AUTHORITY,
+                    new Bundle(),
+                    SYNC_INTERVAL
+            );
+        }
     }
 
     private boolean isSyncEnabled() {

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsActivity.java

@@ -47,6 +47,7 @@ import android.view.ViewGroup;
 import android.widget.LinearLayout;
 
 import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.KeychainApplication;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.compatibility.AppCompatPreferenceActivity;
 import org.sufficientlysecure.keychain.service.ContactSyncAdapterService;
@@ -422,8 +423,7 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
             super.onResume();
             // this needs to be done in onResume since the user can change sync values from Android
             // settings and we need to reflect that change when the user navigates back
-            AccountManager manager = AccountManager.get(getActivity());
+            final Account account = KeychainApplication.createAccountIfNecessary(getActivity());
-            final Account account = manager.getAccountsByType(Constants.ACCOUNT_TYPE)[0];
             // for keyserver sync
             initializeSyncCheckBox(
                     (SwitchPreference) findPreference(Constants.Pref.SYNC_KEYSERVER),
@@ -441,8 +441,11 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
         private void initializeSyncCheckBox(final SwitchPreference syncCheckBox,
                                             final Account account,
                                             final String authority) {
-            boolean syncEnabled = ContentResolver.getSyncAutomatically(account, authority)
+            // account is null if it could not be created for some reason
-                    && checkContactsPermission(authority);
+            boolean syncEnabled =
+                    account != null
+                            && ContentResolver.getSyncAutomatically(account, authority)
+                            && checkContactsPermission(authority);
             syncCheckBox.setChecked(syncEnabled);
             setSummary(syncCheckBox, authority, syncEnabled);
 
@@ -464,6 +467,11 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
                             return false;
                         }
                     } else {
+                        if (account == null) {
+                            // if account could not be created for some reason,
+                            // we can't have our sync
+                            return false;
+                        }
                         // disable syncs
                         ContentResolver.setSyncAutomatically(account, authority, false);
                         // immediately delete any linked contacts

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/Preferences.java

@@ -19,7 +19,9 @@
 package org.sufficientlysecure.keychain.util;
 
 
+import android.accounts.Account;
 import android.annotation.SuppressLint;
+import android.content.ContentResolver;
 import android.content.Context;
 import android.content.SharedPreferences;
 import android.os.Parcel;
@@ -29,6 +31,7 @@ import android.support.annotation.NonNull;
 
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.Constants.Pref;
+import org.sufficientlysecure.keychain.KeychainApplication;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.service.KeyserverSyncAdapterService;
 
@@ -76,9 +79,8 @@ public class Preferences {
 
     /**
      * Makes android's preference framework write to our file instead of default.
-     * This allows us to use the "persistent" attribute to simplify code, which automatically
+     * This allows us to use the xml "persistent" attribute to simplify code, which automatically
      * writes and reads preference values.
-     * @param manager
      */
     public static void setPreferenceManagerFileAndMode(PreferenceManager manager) {
         manager.setSharedPreferencesName(PREF_FILE_NAME);
@@ -302,6 +304,23 @@ public class Preferences {
 
     }
 
+    /**
+     * @return true if a periodic sync exists and is set to run automatically, false otherwise
+     */
+    public static boolean getKeyserverSyncEnabled(Context context) {
+        Account account = KeychainApplication.createAccountIfNecessary(context);
+
+        if (account == null) {
+            // if the account could not be created for some reason, we can't have a sync
+            return false;
+        }
+
+        String authority = Constants.PROVIDER_AUTHORITY;
+
+        return ContentResolver.getSyncAutomatically(account, authority) &&
+                !ContentResolver.getPeriodicSyncs(account, authority).isEmpty();
+    }
+
     public CacheTTLPrefs getPassphraseCacheTtl() {
         Set<String> pref = mSharedPreferences.getStringSet(Constants.Pref.PASSPHRASE_CACHE_TTLS, null);
         if (pref == null) {