Hide delete policy "Mark as read on server" for POP3 accounts

src/com/fsck/k9/activity/setup/AccountSettings.java

@@ -125,6 +125,7 @@ public class AccountSettings extends K9PreferenceActivity {
     private boolean mIsMoveCapable = false;
     private boolean mIsPushCapable = false;
     private boolean mIsExpungeCapable = false;
+    private boolean mIsSeenFlagSupported = false;
 
     private PreferenceScreen mMainScreen;
     private PreferenceScreen mComposingScreen;
@@ -210,6 +211,7 @@ public class AccountSettings extends K9PreferenceActivity {
             mIsMoveCapable = store.isMoveCapable();
             mIsPushCapable = store.isPushCapable();
             mIsExpungeCapable = store.isExpungeCapable();
+            mIsSeenFlagSupported = store.isSeenFlagSupported();
         } catch (Exception e) {
             Log.e(K9.LOG_TAG, "Could not get remote store", e);
         }
@@ -354,7 +356,10 @@ public class AccountSettings extends K9PreferenceActivity {
         });
 
         mDeletePolicy = (ListPreference) findPreference(PREFERENCE_DELETE_POLICY);
-        mDeletePolicy.setValue("" + mAccount.getDeletePolicy());
+        if (!mIsSeenFlagSupported) {
+            removeListEntry(mDeletePolicy, Integer.toString(Account.DELETE_POLICY_MARK_AS_READ));
+        }
+        mDeletePolicy.setValue(Integer.toString(mAccount.getDeletePolicy()));
         mDeletePolicy.setSummary(mDeletePolicy.getEntry());
         mDeletePolicy.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
             public boolean onPreferenceChange(Preference preference, Object newValue) {
@@ -716,6 +721,26 @@ public class AccountSettings extends K9PreferenceActivity {
         }
     }
 
+    private void removeListEntry(ListPreference listPreference, String remove) {
+        CharSequence[] entryValues = listPreference.getEntryValues();
+        CharSequence[] entries = listPreference.getEntries();
+
+        CharSequence[] newEntryValues = new String[entryValues.length - 1];
+        CharSequence[] newEntries = new String[entryValues.length - 1];
+
+        for (int i = 0, out = 0; i < entryValues.length; i++) {
+            CharSequence value = entryValues[i];
+            if (!value.equals(remove)) {
+                newEntryValues[out] = value;
+                newEntries[out] = entries[i];
+                out++;
+            }
+        }
+
+        listPreference.setEntryValues(newEntryValues);
+        listPreference.setEntries(newEntries);
+    }
+
     private void handleCryptoAppDependencies() {
         if ("".equals(mCryptoApp.getValue())) {
             mCryptoAutoSignature.setEnabled(false);

src/com/fsck/k9/mail/Store.java

@@ -194,6 +194,10 @@ public abstract class Store {
         return false;
     }
 
+    public boolean isSeenFlagSupported() {
+        return true;
+    }
+
     public void sendMessages(Message[] messages) throws MessagingException {
     }
 

src/com/fsck/k9/mail/store/Pop3Store.java

@@ -287,6 +287,11 @@ public class Pop3Store extends Store {
         folder.close();
     }
 
+    @Override
+    public boolean isSeenFlagSupported() {
+        return false;
+    }
+
     class Pop3Folder extends Folder {
         private Socket mSocket;
         private InputStream mIn;