reworked keyserver preferences with recyclerview

9 files changed, 806 insertions, 217 deletions

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsActivity.java
index a552e1c55..6fc0aaac6 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsActivity.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsActivity.java
@@ -34,6 +34,7 @@ import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.compatibility.AppCompatPreferenceActivity;
 import org.sufficientlysecure.keychain.ui.widget.IntegerListPreference;
+import org.sufficientlysecure.keychain.util.Log;
 import org.sufficientlysecure.keychain.util.Preferences;
 
 import java.util.List;
@@ -124,27 +125,6 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
     }
 
     @Override
-    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
-        switch (requestCode) {
-            case REQUEST_CODE_KEYSERVER_PREF: {
-                if (resultCode == RESULT_CANCELED || data == null) {
-                    return;
-                }
-                String servers[] = data
-                        .getStringArrayExtra(SettingsKeyServerActivity.EXTRA_KEY_SERVERS);
-                sPreferences.setKeyServers(servers);
-                mKeyServerPreference.setSummary(keyserverSummary(this));
-                break;
-            }
-
-            default: {
-                super.onActivityResult(requestCode, resultCode, data);
-                break;
-            }
-        }
-    }
-
-    @Override
     public void onBuildHeaders(List<Header> target) {
         super.onBuildHeaders(target);
         loadHeadersFromResource(R.xml.preference_headers, target);
@@ -190,12 +170,7 @@ public class SettingsActivity extends AppCompatPreferenceActivity {
         public void onActivityResult(int requestCode, int resultCode, Intent data) {
             switch (requestCode) {
                 case REQUEST_CODE_KEYSERVER_PREF: {
-                    if (resultCode == RESULT_CANCELED || data == null) {
-                        return;
-                    }
-                    String servers[] = data
-                            .getStringArrayExtra(SettingsKeyServerActivity.EXTRA_KEY_SERVERS);
-                    sPreferences.setKeyServers(servers);
+                    // update preference, in case it changed
                     mKeyServerPreference.setSummary(keyserverSummary(getActivity()));
                     break;
                 }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsKeyServerActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsKeyServerActivity.java
index dc203756f..f61ada84f 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsKeyServerActivity.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsKeyServerActivity.java
@@ -17,89 +17,23 @@
 
 package org.sufficientlysecure.keychain.ui;
 
-import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
-import android.os.Handler;
-import android.os.Message;
-import android.os.Messenger;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.View.OnClickListener;
-import android.view.ViewGroup;
-import android.widget.TextView;
 
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.ui.base.BaseActivity;
-import org.sufficientlysecure.keychain.ui.dialog.AddKeyserverDialogFragment;
-import org.sufficientlysecure.keychain.ui.util.Notify;
-import org.sufficientlysecure.keychain.ui.widget.Editor;
-import org.sufficientlysecure.keychain.ui.widget.Editor.EditorListener;
-import org.sufficientlysecure.keychain.ui.widget.KeyServerEditor;
 
-import java.util.Vector;
-
-public class SettingsKeyServerActivity extends BaseActivity implements OnClickListener,
-        EditorListener {
+public class SettingsKeyServerActivity extends BaseActivity {
 
     public static final String EXTRA_KEY_SERVERS = "key_servers";
 
-    private LayoutInflater mInflater;
-    private ViewGroup mEditors;
-    private View mAdd;
-    private View mRotate;
-    private TextView mTitle;
-    private TextView mSummary;
-
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
-        // Inflate a "Done"/"Cancel" custom action bar view
-        setFullScreenDialogDoneClose(R.string.btn_save,
-                new View.OnClickListener() {
-                    @Override
-                    public void onClick(View v) {
-                        okClicked();
-                    }
-                },
-                new View.OnClickListener() {
-                    @Override
-                    public void onClick(View v) {
-                        cancelClicked();
-                    }
-                });
-
-        mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
-
-        mTitle = (TextView) findViewById(R.id.title);
-        mSummary = (TextView) findViewById(R.id.summary);
-        mSummary.setText(getText(R.string.label_first_keyserver_is_used));
-
-        mTitle.setText(R.string.label_keyservers);
-
-        mEditors = (ViewGroup) findViewById(R.id.editors);
-        mAdd = findViewById(R.id.add);
-        mAdd.setOnClickListener(this);
-
-        mRotate = findViewById(R.id.rotate);
-        mRotate.setOnClickListener(new OnClickListener() {
-            @Override
-            public void onClick(View view) {
-                Vector<String> servers = serverList();
-                String first = servers.get(0);
-                if (first != null) {
-                    servers.remove(0);
-                    servers.add(first);
-                    String[] dummy = {};
-                    makeServerList(servers.toArray(dummy));
-                }
-            }
-        });
-
         Intent intent = getIntent();
         String servers[] = intent.getStringArrayExtra(EXTRA_KEY_SERVERS);
-        makeServerList(servers);
+        loadFragment(savedInstanceState, servers);
     }
 
     @Override
@@ -107,118 +41,22 @@ public class SettingsKeyServerActivity extends BaseActivity implements OnClickLi
         setContentView(R.layout.key_server_preference);
     }
 
-    private void makeServerList(String[] servers) {
-        if (servers != null) {
-            mEditors.removeAllViews();
-            for (String serv : servers) {
-                KeyServerEditor view = (KeyServerEditor) mInflater.inflate(
-                        R.layout.key_server_editor, mEditors, false);
-                view.setEditorListener(this);
-                view.setValue(serv);
-                mEditors.addView(view);
-            }
+    private void loadFragment(Bundle savedInstanceState, String[] keyservers) {
+        // However, if we're being restored from a previous state,
+        // then we don't need to do anything and should return or else
+        // we could end up with overlapping fragments.
+        if (savedInstanceState != null) {
+            return;
         }
-    }
-
-    public void onDeleted(Editor editor, boolean wasNewItem) {
-        // nothing to do
-    }
 
-    @Override
-    public void onEdited() {
+        SettingsKeyserverFragment fragment = SettingsKeyserverFragment.newInstance(keyservers);
 
-    }
-
-    // button to add keyserver clicked
-    public void onClick(View v) {
-        Handler returnHandler = new Handler() {
-            @Override
-            public void handleMessage(Message message) {
-                Bundle data = message.getData();
-                switch (message.what) {
-                    case AddKeyserverDialogFragment.MESSAGE_OKAY: {
-                        boolean verified = data.getBoolean(AddKeyserverDialogFragment.MESSAGE_VERIFIED);
-                        if (verified) {
-                            Notify.create(SettingsKeyServerActivity.this,
-                                    R.string.add_keyserver_verified, Notify.Style.OK).show();
-                        } else {
-                            Notify.create(SettingsKeyServerActivity.this,
-                                    R.string.add_keyserver_without_verification,
-                                    Notify.Style.WARN).show();
-                        }
-                        String keyserver = data.getString(AddKeyserverDialogFragment.MESSAGE_KEYSERVER);
-                        addKeyserver(keyserver);
-                        break;
-                    }
-                    case AddKeyserverDialogFragment.MESSAGE_VERIFICATION_FAILED: {
-                        AddKeyserverDialogFragment.FailureReason failureReason =
-                                (AddKeyserverDialogFragment.FailureReason) data.getSerializable(
-                                        AddKeyserverDialogFragment.MESSAGE_FAILURE_REASON);
-                        switch (failureReason) {
-                            case CONNECTION_FAILED: {
-                                Notify.create(SettingsKeyServerActivity.this,
-                                        R.string.add_keyserver_connection_failed,
-                                        Notify.Style.ERROR).show();
-                                break;
-                            }
-                            case INVALID_URL: {
-                                Notify.create(SettingsKeyServerActivity.this,
-                                        R.string.add_keyserver_invalid_url,
-                                        Notify.Style.ERROR).show();
-                                break;
-                            }
-                        }
-                        break;
-                    }
-                }
-            }
-        };
-
-        // Create a new Messenger for the communication back
-        Messenger messenger = new Messenger(returnHandler);
-        AddKeyserverDialogFragment dialogFragment = AddKeyserverDialogFragment
-                .newInstance(messenger);
-        dialogFragment.show(getSupportFragmentManager(), "addKeyserverDialog");
-    }
-
-    public void addKeyserver(String keyserverUrl) {
-        KeyServerEditor view = (KeyServerEditor) mInflater.inflate(R.layout.key_server_editor,
-                mEditors, false);
-        view.setEditorListener(this);
-        view.setValue(keyserverUrl);
-        mEditors.addView(view);
-    }
-
-    private void cancelClicked() {
-        setResult(RESULT_CANCELED, null);
-        finish();
-    }
-
-    private Vector<String> serverList() {
-        Vector<String> servers = new Vector<>();
-        for (int i = 0; i < mEditors.getChildCount(); ++i) {
-            KeyServerEditor editor = (KeyServerEditor) mEditors.getChildAt(i);
-            String tmp = editor.getValue();
-            if (tmp.length() > 0) {
-                servers.add(tmp);
-            }
-        }
-        return servers;
-    }
-
-    private void okClicked() {
-        Intent data = new Intent();
-        Vector<String> servers = new Vector<>();
-        for (int i = 0; i < mEditors.getChildCount(); ++i) {
-            KeyServerEditor editor = (KeyServerEditor) mEditors.getChildAt(i);
-            String tmp = editor.getValue();
-            if (tmp.length() > 0) {
-                servers.add(tmp);
-            }
-        }
-        String[] dummy = new String[0];
-        data.putExtra(EXTRA_KEY_SERVERS, servers.toArray(dummy));
-        setResult(RESULT_OK, data);
-        finish();
+        // Add the fragment to the 'fragment_container' FrameLayout
+        // NOTE: We use commitAllowingStateLoss() to prevent weird crashes!
+        getSupportFragmentManager().beginTransaction()
+                .replace(R.id.keyserver_settings_fragment_container, fragment)
+                .commitAllowingStateLoss();
+        // do it immediately!
+        getSupportFragmentManager().executePendingTransactions();
     }
 }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsKeyserverFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsKeyserverFragment.java
new file mode 100644
index 000000000..20565aa7d
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/SettingsKeyserverFragment.java
@@ -0,0 +1,363 @@
+/*
+ * Copyright (C) 2012-2015 Dominik Schürmann <dominik@dominikschuermann.de>
+ * Copyright (C) 2015 Adithya Abraham Philip <adithyaphilip@gmail.com>
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.ui;
+
+import android.graphics.Color;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.os.Messenger;
+import android.support.v4.app.Fragment;
+import android.support.v4.view.MotionEventCompat;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.ui.dialog.AddEditKeyserverDialogFragment;
+import org.sufficientlysecure.keychain.ui.util.recyclerview.ItemTouchHelperAdapter;
+import org.sufficientlysecure.keychain.ui.util.recyclerview.ItemTouchHelperViewHolder;
+import org.sufficientlysecure.keychain.ui.util.recyclerview.ItemTouchHelperDragCallback;
+import org.sufficientlysecure.keychain.ui.util.Notify;
+import org.sufficientlysecure.keychain.ui.util.recyclerview.RecyclerItemClickListener;
+import org.sufficientlysecure.keychain.util.Preferences;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class SettingsKeyserverFragment extends Fragment implements RecyclerItemClickListener.OnItemClickListener {
+
+    private static final String ARG_KEYSERVER_ARRAY = "arg_keyserver_array";
+    private ItemTouchHelper mItemTouchHelper;
+
+    private ArrayList<String> mKeyservers;
+    private KeyserverListAdapter mAdapter;
+
+    public static SettingsKeyserverFragment newInstance(String[] keyservers) {
+        Bundle args = new Bundle();
+        args.putStringArray(ARG_KEYSERVER_ARRAY, keyservers);
+
+        SettingsKeyserverFragment fragment = new SettingsKeyserverFragment();
+        fragment.setArguments(args);
+
+        return fragment;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle
+            savedInstanceState) {
+
+        return inflater.inflate(R.layout.settings_keyserver_fragment, null);
+    }
+
+    @Override
+    public void onViewCreated(View view, Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+
+        String keyservers[] = getArguments().getStringArray(ARG_KEYSERVER_ARRAY);
+        mKeyservers = new ArrayList<>(Arrays.asList(keyservers));
+        saveKeyserverList(); // in case user does not make any changes
+
+        mAdapter = new KeyserverListAdapter(mKeyservers);
+
+        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.keyserver_recycler_view);
+        // recyclerView.setHasFixedSize(true); // the size of the first item changes
+        recyclerView.setAdapter(mAdapter);
+        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
+
+
+        ItemTouchHelper.Callback callback = new ItemTouchHelperDragCallback(mAdapter);
+        mItemTouchHelper = new ItemTouchHelper(callback);
+        mItemTouchHelper.attachToRecyclerView(recyclerView);
+
+        // for clicks
+        recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getActivity(), this));
+
+        // can't use item decoration because it doesn't move with drag and drop
+        // recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), null));
+
+        // We have a menu item to show in action bar.
+        setHasOptionsMenu(true);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
+        inflater.inflate(R.menu.keyserver_pref_menu, menu);
+
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+
+            case R.id.menu_add_keyserver:
+                startAddKeyserverDialog();
+                return true;
+
+            default:
+                return super.onOptionsItemSelected(item);
+        }
+    }
+
+    private void startAddKeyserverDialog() {
+        // keyserver and position have no meaning
+        startEditKeyserverDialog(AddEditKeyserverDialogFragment.DialogAction.ADD, null, -1);
+    }
+
+    private void startEditKeyserverDialog(AddEditKeyserverDialogFragment.DialogAction action,
+                                          String keyserver, final int position) {
+        Handler returnHandler = new Handler() {
+            @Override
+            public void handleMessage(Message message) {
+                Bundle data = message.getData();
+                switch (message.what) {
+                    case AddEditKeyserverDialogFragment.MESSAGE_OKAY: {
+                        boolean deleted =
+                                data.getBoolean(AddEditKeyserverDialogFragment.MESSAGE_KEYSERVER_DELETED
+                                        , false);
+                        if (deleted) {
+                            Notify.create(getActivity(),
+                                    getActivity().getString(
+                                            R.string.keyserver_deleted, mKeyservers.get(position)),
+                                    Notify.Style.OK)
+                                    .show();
+                            deleteKeyserver(position);
+                            return;
+                        }
+                        boolean verified =
+                                data.getBoolean(AddEditKeyserverDialogFragment.MESSAGE_VERIFIED);
+                        if (verified) {
+                            Notify.create(getActivity(),
+                                    R.string.add_keyserver_verified, Notify.Style.OK).show();
+                        } else {
+                            Notify.create(getActivity(),
+                                    R.string.add_keyserver_without_verification,
+                                    Notify.Style.WARN).show();
+                        }
+                        String keyserver = data.getString(
+                                AddEditKeyserverDialogFragment.MESSAGE_KEYSERVER);
+
+                        AddEditKeyserverDialogFragment.DialogAction dialogAction
+                                = (AddEditKeyserverDialogFragment.DialogAction) data.getSerializable(
+                                AddEditKeyserverDialogFragment.MESSAGE_DIALOG_ACTION);
+                        switch (dialogAction) {
+                            case ADD:
+                                addKeyserver(keyserver);
+                                break;
+                            case EDIT:
+                                editKeyserver(keyserver, position);
+                                break;
+                        }
+                        break;
+                    }
+                    case AddEditKeyserverDialogFragment.MESSAGE_VERIFICATION_FAILED: {
+                        AddEditKeyserverDialogFragment.FailureReason failureReason =
+                                (AddEditKeyserverDialogFragment.FailureReason) data.getSerializable(
+                                        AddEditKeyserverDialogFragment.MESSAGE_FAILURE_REASON);
+                        switch (failureReason) {
+                            case CONNECTION_FAILED: {
+                                Notify.create(getActivity(),
+                                        R.string.add_keyserver_connection_failed,
+                                        Notify.Style.ERROR).show();
+                                break;
+                            }
+                            case INVALID_URL: {
+                                Notify.create(getActivity(),
+                                        R.string.add_keyserver_invalid_url,
+                                        Notify.Style.ERROR).show();
+                                break;
+                            }
+                        }
+                        break;
+                    }
+                }
+            }
+        };
+
+        // Create a new Messenger for the communication back
+        Messenger messenger = new Messenger(returnHandler);
+        AddEditKeyserverDialogFragment dialogFragment = AddEditKeyserverDialogFragment
+                .newInstance(messenger, action, keyserver, position);
+        dialogFragment.show(getFragmentManager(), "addKeyserverDialog");
+    }
+
+    private void addKeyserver(String keyserver) {
+        mKeyservers.add(keyserver);
+        mAdapter.notifyItemInserted(mKeyservers.size() - 1);
+        saveKeyserverList();
+    }
+
+    private void editKeyserver(String newKeyserver, int position) {
+        mKeyservers.set(position, newKeyserver);
+        mAdapter.notifyItemChanged(position);
+        saveKeyserverList();
+    }
+
+    private void deleteKeyserver(int position) {
+        mKeyservers.remove(position);
+        // we use this
+        mAdapter.notifyItemRemoved(position);
+        if (position == 0 && mKeyservers.size() > 0) {
+            // if we deleted the first item, we need the adapter to redraw the new first item
+            mAdapter.notifyItemChanged(0);
+        }
+        saveKeyserverList();
+    }
+
+    private void saveKeyserverList() {
+        String servers[] = mKeyservers.toArray(new String[mKeyservers.size()]);
+        Preferences.getPreferences(getActivity()).setKeyServers(servers);
+    }
+
+    @Override
+    public void onItemClick(View view, int position) {
+        startEditKeyserverDialog(AddEditKeyserverDialogFragment.DialogAction.EDIT,
+                mKeyservers.get(position), position);
+    }
+
+    public class KeyserverListAdapter extends RecyclerView.Adapter<KeyserverListAdapter.ViewHolder>
+            implements ItemTouchHelperAdapter {
+
+        // to update the ViewHolder associated with first item, for when an item is deleted
+        private ViewHolder mFirstItem;
+
+        private final List<String> mKeyservers;
+
+        public KeyserverListAdapter(List<String> keyservers) {
+            mKeyservers = keyservers;
+        }
+
+        @Override
+        public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+            View view = LayoutInflater.from(parent.getContext())
+                    .inflate(R.layout.settings_keyserver_item, parent, false);
+            ViewHolder viewHolder = new ViewHolder(view);
+            return viewHolder;
+        }
+
+        @Override
+        public void onBindViewHolder(final ViewHolder holder, int position) {
+            if (position == 0) {
+                mFirstItem = holder;
+            }
+            holder.keyserverUrl.setText(mKeyservers.get(position));
+
+            // Start a drag whenever the handle view it touched
+            holder.dragHandleView.setOnTouchListener(new View.OnTouchListener() {
+                @Override
+                public boolean onTouch(View v, MotionEvent event) {
+                    if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_DOWN) {
+                        mItemTouchHelper.startDrag(holder);
+                    }
+                    return false;
+                }
+            });
+
+            selectUnselectKeyserver(holder, position);
+        }
+
+        private void selectUnselectKeyserver(ViewHolder holder, int position) {
+
+            if (position == 0) {
+                holder.showAsSelectedKeyserver();
+            } else {
+                holder.showAsUnselectedKeyserver();
+            }
+        }
+
+        @Override
+        public void onItemMove(RecyclerView.ViewHolder source, RecyclerView.ViewHolder target,
+                               int fromPosition, int toPosition) {
+            Collections.swap(mKeyservers, fromPosition, toPosition);
+            saveKeyserverList();
+            selectUnselectKeyserver((ViewHolder) target, fromPosition);
+            // we don't want source to change color while dragging, therefore we just set
+            // isSelectedKeyserver instead of selectUnselectKeyserver
+            ((ViewHolder) source).isSelectedKeyserver = toPosition == 0;
+
+            notifyItemMoved(fromPosition, toPosition);
+        }
+
+        @Override
+        public int getItemCount() {
+            return mKeyservers.size();
+        }
+
+        public class ViewHolder extends RecyclerView.ViewHolder implements
+                ItemTouchHelperViewHolder {
+
+            public final ViewGroup outerLayout;
+            public final TextView selectedServerLabel;
+            public final TextView keyserverUrl;
+            public final ImageView dragHandleView;
+
+            private boolean isSelectedKeyserver = false;
+
+            public ViewHolder(View itemView) {
+                super(itemView);
+                outerLayout = (ViewGroup) itemView.findViewById(R.id.outer_layout);
+                selectedServerLabel = (TextView) itemView.findViewById(
+                        R.id.selected_keyserver_title);
+                keyserverUrl = (TextView) itemView.findViewById(R.id.keyserver_tv);
+                dragHandleView = (ImageView) itemView.findViewById(R.id.drag_handle);
+
+                itemView.setClickable(true);
+            }
+
+            public void showAsSelectedKeyserver() {
+                isSelectedKeyserver = true;
+                selectedServerLabel.setVisibility(View.VISIBLE);
+                outerLayout.setBackgroundColor(getResources().getColor(R.color.android_green_dark));
+            }
+
+            public void showAsUnselectedKeyserver() {
+                isSelectedKeyserver = false;
+                selectedServerLabel.setVisibility(View.GONE);
+                outerLayout.setBackgroundColor(Color.WHITE);
+            }
+
+            @Override
+            public void onItemSelected() {
+                selectedServerLabel.setVisibility(View.GONE);
+                itemView.setBackgroundColor(Color.LTGRAY);
+            }
+
+            @Override
+            public void onItemClear() {
+                if (isSelectedKeyserver) {
+                    showAsSelectedKeyserver();
+                } else {
+                    showAsUnselectedKeyserver();
+                }
+            }
+        }
+    }
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddKeyserverDialogFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddEditKeyserverDialogFragment.java
index 2c1714b67..321242b2f 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddKeyserverDialogFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/dialog/AddEditKeyserverDialogFragment.java
@@ -53,8 +53,11 @@ import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.util.Log;
 import org.sufficientlysecure.keychain.util.TlsHelper;
 
-public class AddKeyserverDialogFragment extends DialogFragment implements OnEditorActionListener {
-    private static final String ARG_MESSENGER = "messenger";
+public class AddEditKeyserverDialogFragment extends DialogFragment implements OnEditorActionListener {
+    private static final String ARG_MESSENGER = "arg_messenger";
+    private static final String ARG_ACTION = "arg_dialog_action";
+    private static final String ARG_POSITION = "arg_position";
+    private static final String ARG_KEYSERVER = "arg_keyserver";
 
     public static final int MESSAGE_OKAY = 1;
     public static final int MESSAGE_VERIFICATION_FAILED = 2;
@@ -62,20 +65,37 @@ public class AddKeyserverDialogFragment extends DialogFragment implements OnEdit
     public static final String MESSAGE_KEYSERVER = "new_keyserver";
     public static final String MESSAGE_VERIFIED = "verified";
     public static final String MESSAGE_FAILURE_REASON = "failure_reason";
+    public static final String MESSAGE_KEYSERVER_DELETED = "keyserver_deleted";
+    public static final String MESSAGE_DIALOG_ACTION = "message_dialog_action";
+    public static final String MESSAGE_EDIT_POSITION = "keyserver_edited_position";
 
     private Messenger mMessenger;
+    private DialogAction mDialogAction;
+    private int mPosition;
+
     private EditText mKeyserverEditText;
     private CheckBox mVerifyKeyserverCheckBox;
 
+    public enum DialogAction {
+        ADD,
+        EDIT
+    }
+
     public enum FailureReason {
         INVALID_URL,
         CONNECTION_FAILED
     }
 
-    public static AddKeyserverDialogFragment newInstance(Messenger messenger) {
-        AddKeyserverDialogFragment frag = new AddKeyserverDialogFragment();
+    public static AddEditKeyserverDialogFragment newInstance(Messenger messenger,
+                                                             DialogAction action,
+                                                             String keyserver,
+                                                             int position) {
+        AddEditKeyserverDialogFragment frag = new AddEditKeyserverDialogFragment();
         Bundle args = new Bundle();
         args.putParcelable(ARG_MESSENGER, messenger);
+        args.putSerializable(ARG_ACTION, action);
+        args.putString(ARG_KEYSERVER, keyserver);
+        args.putInt(ARG_POSITION, position);
 
         frag.setArguments(args);
 
@@ -88,11 +108,11 @@ public class AddKeyserverDialogFragment extends DialogFragment implements OnEdit
         final Activity activity = getActivity();
 
         mMessenger = getArguments().getParcelable(ARG_MESSENGER);
+        mDialogAction = (DialogAction) getArguments().getSerializable(ARG_ACTION);
+        mPosition = getArguments().getInt(ARG_POSITION);
 
         CustomAlertDialogBuilder alert = new CustomAlertDialogBuilder(activity);
 
-        alert.setTitle(R.string.add_keyserver_dialog_title);
-
         LayoutInflater inflater = activity.getLayoutInflater();
         View view = inflater.inflate(R.layout.add_keyserver_dialog, null);
         alert.setView(view);
@@ -100,14 +120,26 @@ public class AddKeyserverDialogFragment extends DialogFragment implements OnEdit
         mKeyserverEditText = (EditText) view.findViewById(R.id.keyserver_url_edit_text);
         mVerifyKeyserverCheckBox = (CheckBox) view.findViewById(R.id.verify_keyserver_checkbox);
 
-        // we don't want dialog to be dismissed on click, thereby requiring the hack seen below
-        // and in onStart
+        switch (mDialogAction) {
+            case ADD: {
+                alert.setTitle(R.string.add_keyserver_dialog_title);
+                break;
+            }
+            case EDIT: {
+                alert.setTitle(R.string.edit_keyserver_dialog_title);
+                mKeyserverEditText.setText(getArguments().getString(ARG_KEYSERVER));
+                break;
+            }
+        }
+
+        // we don't want dialog to be dismissed on click for keyserver addition or edit,
+        // thereby requiring the hack seen below and in onStart
         alert.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int id) {
                 // we need to have an empty listener to prevent errors on some devices as mentioned
                 // at http://stackoverflow.com/q/13746412/3000919
-                // actual listener set in onStart
+                // actual listener set in onStart for adding keyservers or editing them
             }
         });
 
@@ -119,6 +151,23 @@ public class AddKeyserverDialogFragment extends DialogFragment implements OnEdit
             }
         });
 
+        switch (mDialogAction) {
+            case EDIT: {
+                alert.setNeutralButton(R.string.label_keyserver_dialog_delete,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                deleteKeyserver(mPosition);
+                            }
+                        });
+                break;
+            }
+            case ADD: {
+                // do nothing
+                break;
+            }
+        }
+
         // Hack to open keyboard.
         // This is the only method that I found to work across all Android versions
         // http://turbomanage.wordpress.com/2012/05/02/show-soft-keyboard-automatically-when-edittext-receives-focus/
@@ -155,25 +204,41 @@ public class AddKeyserverDialogFragment extends DialogFragment implements OnEdit
             positiveButton.setOnClickListener(new View.OnClickListener() {
                 @Override
                 public void onClick(View v) {
+                    // behaviour same for edit and add
                     String keyserverUrl = mKeyserverEditText.getText().toString();
                     if (mVerifyKeyserverCheckBox.isChecked()) {
                         verifyConnection(keyserverUrl);
                     } else {
                         dismiss();
                         // return unverified keyserver back to activity
-                        addKeyserver(keyserverUrl, false);
+                        keyserverEdited(keyserverUrl, false);
                     }
                 }
             });
         }
     }
 
-    public void addKeyserver(String keyserver, boolean verified) {
+    public void keyserverEdited(String keyserver, boolean verified) {
         dismiss();
         Bundle data = new Bundle();
+        data.putSerializable(MESSAGE_DIALOG_ACTION, mDialogAction);
         data.putString(MESSAGE_KEYSERVER, keyserver);
         data.putBoolean(MESSAGE_VERIFIED, verified);
 
+        if (mDialogAction == DialogAction.EDIT) {
+            data.putInt(MESSAGE_EDIT_POSITION, mPosition);
+        }
+
+        sendMessageToHandler(MESSAGE_OKAY, data);
+    }
+
+    public void deleteKeyserver(int position) {
+        dismiss();
+        Bundle data = new Bundle();
+        data.putSerializable(MESSAGE_DIALOG_ACTION, DialogAction.EDIT);
+        data.putInt(MESSAGE_EDIT_POSITION, position);
+        data.putBoolean(MESSAGE_KEYSERVER_DELETED, true);
+
         sendMessageToHandler(MESSAGE_OKAY, data);
     }
 
@@ -238,7 +303,7 @@ public class AddKeyserverDialogFragment extends DialogFragment implements OnEdit
             protected void onPostExecute(FailureReason failureReason) {
                 mProgressDialog.dismiss();
                 if (failureReason == null) {
-                    addKeyserver(mKeyserver, true);
+                    keyserverEdited(mKeyserver, true);
                 } else {
                     verificationFailed(failureReason);
                 }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/DividerItemDecoration.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/DividerItemDecoration.java
new file mode 100644
index 000000000..95199bcd5
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/DividerItemDecoration.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.sufficientlysecure.keychain.ui.util.recyclerview;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.graphics.Canvas;
+import android.graphics.Rect;
+import android.graphics.drawable.Drawable;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+
+public class DividerItemDecoration extends RecyclerView.ItemDecoration {
+
+    private static final int[] ATTRS = new int[]{
+            android.R.attr.listDivider
+    };
+
+    public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
+
+    public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
+
+    private Drawable mDivider;
+
+    private int mOrientation;
+
+    public DividerItemDecoration(Context context, int orientation) {
+        final TypedArray a = context.obtainStyledAttributes(ATTRS);
+        mDivider = a.getDrawable(0);
+        a.recycle();
+        setOrientation(orientation);
+    }
+
+    public void setOrientation(int orientation) {
+        if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) {
+            throw new IllegalArgumentException("invalid orientation");
+        }
+        mOrientation = orientation;
+    }
+
+    @Override
+    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
+        if (mOrientation == VERTICAL_LIST) {
+            drawVertical(c, parent);
+        } else {
+            drawHorizontal(c, parent);
+        }
+    }
+
+    public void drawVertical(Canvas c, RecyclerView parent) {
+        final int left = parent.getPaddingLeft();
+        final int right = parent.getWidth() - parent.getPaddingRight();
+
+        final int childCount = parent.getChildCount();
+        for (int i = 0; i < childCount; i++) {
+            final View child = parent.getChildAt(i);
+            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
+                    .getLayoutParams();
+            final int top = child.getBottom() + params.bottomMargin;
+            final int bottom = top + mDivider.getIntrinsicHeight();
+            mDivider.setBounds(left, top, right, bottom);
+            mDivider.draw(c);
+        }
+    }
+
+    public void drawHorizontal(Canvas c, RecyclerView parent) {
+        final int top = parent.getPaddingTop();
+        final int bottom = parent.getHeight() - parent.getPaddingBottom();
+
+        final int childCount = parent.getChildCount();
+        for (int i = 0; i < childCount; i++) {
+            final View child = parent.getChildAt(i);
+            final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
+                    .getLayoutParams();
+            final int left = child.getRight() + params.rightMargin;
+            final int right = left + mDivider.getIntrinsicHeight();
+            mDivider.setBounds(left, top, right, bottom);
+            mDivider.draw(c);
+        }
+    }
+
+    @Override
+    public void getItemOffsets(Rect outRect, View view, RecyclerView parent,
+                               RecyclerView.State state) {
+        if (mOrientation == VERTICAL_LIST) {
+            outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
+        } else {
+            outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
+        }
+    }
+}
\ No newline at end of file
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperAdapter.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperAdapter.java
new file mode 100644
index 000000000..c691182bf
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperAdapter.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2015 Paul Burke
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.sufficientlysecure.keychain.ui.util.recyclerview;
+
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+/**
+ * Interface to listen for a move or dismissal event from a {@link ItemTouchHelper.Callback}.
+ */
+public interface ItemTouchHelperAdapter {
+
+    /**
+     * Called when an item has been dragged far enough to trigger a move. This is called every time
+     * an item is shifted, and <strong>not</strong> at the end of a "drop" event.<br/>
+     * <br/>
+     * Implementations should call {@link RecyclerView.Adapter#notifyItemMoved(int, int)} after
+     * adjusting the underlying data to reflect this move.
+     *
+     * @param fromPosition The start position of the moved item.
+     * @param toPosition   Then resolved position of the moved item.
+     * @see RecyclerView#getAdapterPositionFor(RecyclerView.ViewHolder)
+     * @see RecyclerView.ViewHolder#getAdapterPosition()
+     */
+    void onItemMove(RecyclerView.ViewHolder source, RecyclerView.ViewHolder target,
+                    int fromPosition, int toPosition);
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperDragCallback.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperDragCallback.java
new file mode 100644
index 000000000..0fd24581d
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperDragCallback.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2015 Paul Burke
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.sufficientlysecure.keychain.ui.util.recyclerview;
+
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+/**
+ * An implementation of {@link ItemTouchHelper.Callback} that enables basic drag & drop and
+ * swipe-to-dismiss. Drag events are automatically started by an item long-press.<br/>
+ * </br/>
+ * Expects the <code>RecyclerView.Adapter</code> to listen for {@link
+ * ItemTouchHelperAdapter} callbacks and the <code>RecyclerView.ViewHolder</code> to implement
+ * {@link ItemTouchHelperViewHolder}.
+ */
+public class ItemTouchHelperDragCallback extends ItemTouchHelper.Callback {
+
+    private final ItemTouchHelperAdapter mAdapter;
+
+    public ItemTouchHelperDragCallback(ItemTouchHelperAdapter adapter) {
+        mAdapter = adapter;
+    }
+
+    @Override
+    public boolean isLongPressDragEnabled() {
+        return false;
+    }
+
+    @Override
+    public boolean isItemViewSwipeEnabled() {
+        return false;
+    }
+
+    @Override
+    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
+        // Enable drag and swipe in both directions
+        final int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
+        final int swipeFlags = 0;
+        return makeMovementFlags(dragFlags, swipeFlags);
+    }
+
+    @Override
+    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder source,
+                          RecyclerView.ViewHolder target) {
+        if (source.getItemViewType() != target.getItemViewType()) {
+            return false;
+        }
+
+        // Notify the adapter of the move
+        mAdapter.onItemMove(source, target, source.getAdapterPosition(), target.getAdapterPosition());
+        return true;
+    }
+
+    @Override
+    public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
+        // we don't support swipe
+    }
+
+    @Override
+    public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {
+        if (actionState != ItemTouchHelper.ACTION_STATE_IDLE) {
+            // Let the view holder know that this item is being moved or dragged
+            ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
+            itemViewHolder.onItemSelected();
+        }
+
+        super.onSelectedChanged(viewHolder, actionState);
+    }
+
+    @Override
+    public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
+        super.clearView(recyclerView, viewHolder);
+
+        // Tell the view holder it's time to restore the idle state
+        ItemTouchHelperViewHolder itemViewHolder = (ItemTouchHelperViewHolder) viewHolder;
+        itemViewHolder.onItemClear();
+    }
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperViewHolder.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperViewHolder.java
new file mode 100644
index 000000000..97e70d71e
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/ItemTouchHelperViewHolder.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2015 Paul Burke
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.sufficientlysecure.keychain.ui.util.recyclerview;
+
+import android.support.v7.widget.helper.ItemTouchHelper;
+
+/**
+ * Interface to notify an item ViewHolder of relevant callbacks from {@link
+ * android.support.v7.widget.helper.ItemTouchHelper.Callback}.
+ */
+public interface ItemTouchHelperViewHolder {
+
+    /**
+     * Called when the {@link ItemTouchHelper} first registers an item as being moved or swiped.
+     * Implementations should update the item view to indicate it's active state.
+     */
+    void onItemSelected();
+
+
+    /**
+     * Called when the {@link ItemTouchHelper} has completed the move or swipe, and the active item
+     * state should be cleared.
+     */
+    void onItemClear();
+}
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/RecyclerItemClickListener.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/RecyclerItemClickListener.java
new file mode 100644
index 000000000..7efcbb30c
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/util/recyclerview/RecyclerItemClickListener.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2014 Jacob Tabak
+ *
+ * This program 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.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.sufficientlysecure.keychain.ui.util.recyclerview;
+
+import android.content.Context;
+import android.support.v7.widget.RecyclerView;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.View;
+
+/**
+ * based on http://stackoverflow.com/a/26196831/3000919
+ */
+public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
+    private OnItemClickListener mListener;
+    private boolean mIgnoreTouch = false;
+
+    public interface OnItemClickListener {
+        void onItemClick(View view, int position);
+    }
+
+    GestureDetector mGestureDetector;
+
+    public RecyclerItemClickListener(Context context, OnItemClickListener listener) {
+        mListener = listener;
+        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
+            @Override
+            public boolean onSingleTapUp(MotionEvent e) {
+                return true;
+            }
+        });
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
+        if (mIgnoreTouch) {
+            return false;
+        }
+        View childView = view.findChildViewUnder(e.getX(), e.getY());
+        if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
+            mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {
+        // TODO: should we move mListener.onItemClick here
+    }
+
+    @Override
+    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
+        mIgnoreTouch = disallowIntercept;
+    }
+}
\ No newline at end of file