added some key binding

* ctrl + tab will open the conversations overview (when available)
* ctrl + up / down will navigate between conversations

src/main/java/eu/siacs/conversations/ui/ConversationActivity.java

@@ -17,6 +17,7 @@ import android.provider.MediaStore;
 import android.support.v4.widget.SlidingPaneLayout;
 import android.support.v4.widget.SlidingPaneLayout.PanelSlideListener;
 import android.util.Log;
+import android.view.KeyEvent;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -88,6 +89,8 @@ public class ConversationActivity extends XmppActivity
 	private Uri mPendingGeoUri = null;
 	private boolean forbidProcessingPendings = false;
 
+	private boolean conversationWasSelectedByKeyboard = false;
+
 	private View mContentView;
 
 	private List<Conversation> conversationList = new ArrayList<>();
@@ -190,6 +193,7 @@ public class ConversationActivity extends XmppActivity
 				if (getSelectedConversation() != conversationList.get(position)) {
 					setSelectedConversation(conversationList.get(position));
 					ConversationActivity.this.mConversationFragment.reInit(getSelectedConversation());
+					conversationWasSelectedByKeyboard = false;
 				}
 				hideConversationsOverview();
 				openConversation();
@@ -856,6 +860,76 @@ public class ConversationActivity extends XmppActivity
 		}
 	}
 
+	@Override
+	public boolean onKeyUp(int key, KeyEvent event) {
+		final boolean modifier = event.isCtrlPressed();
+		final boolean upKey = key == KeyEvent.KEYCODE_DPAD_UP || key == KeyEvent.KEYCODE_DPAD_LEFT;
+		final boolean downKey = key == KeyEvent.KEYCODE_DPAD_DOWN || key == KeyEvent.KEYCODE_DPAD_RIGHT;
+		if (modifier && key == KeyEvent.KEYCODE_TAB && isConversationsOverviewHideable()) {
+			toggleConversationsOverview();
+			return true;
+		} else if (modifier && downKey) {
+			if (isConversationsOverviewHideable() && !isConversationsOverviewVisable()) {
+				showConversationsOverview();;
+			}
+			selectDownConversation();
+			return true;
+		} else if (modifier && upKey) {
+			if (isConversationsOverviewHideable() && !isConversationsOverviewVisable()) {
+				showConversationsOverview();;
+			}
+			selectUpConversation();
+			return true;
+		} else {
+			return super.onKeyUp(key, event);
+		}
+	}
+
+	private void toggleConversationsOverview() {
+		if (isConversationsOverviewVisable()) {
+			hideConversationsOverview();
+			if (mConversationFragment != null) {
+				mConversationFragment.setFocusOnInputField();
+			}
+		} else {
+			showConversationsOverview();
+		}
+	}
+
+	private void selectUpConversation() {
+		Log.d(Config.LOGTAG,"select up conversation");
+		if (this.mSelectedConversation != null) {
+			int index = this.conversationList.indexOf(this.mSelectedConversation);
+			if (index > 0) {
+				int next = index - 1;
+				this.conversationWasSelectedByKeyboard = true;
+				setSelectedConversation(this.conversationList.get(next));
+				this.mConversationFragment.reInit(getSelectedConversation());
+				if (next > listView.getLastVisiblePosition() -1  || next < listView.getFirstVisiblePosition() + 1) {
+					this.listView.setSelection(next);
+				}
+				openConversation();
+			}
+		}
+	}
+
+	private void selectDownConversation() {
+		Log.d(Config.LOGTAG, "select down conversation");
+		if (this.mSelectedConversation != null) {
+			int index = this.conversationList.indexOf(this.mSelectedConversation);
+			if (index != -1 && index < this.conversationList.size() - 1) {
+				int next = index + 1;
+				this.conversationWasSelectedByKeyboard = true;
+				setSelectedConversation(this.conversationList.get(next));
+				this.mConversationFragment.reInit(getSelectedConversation());
+				if (next > listView.getLastVisiblePosition() -1 || next < listView.getFirstVisiblePosition() + 1) {
+					this.listView.setSelection(next);
+				}
+				openConversation();
+			}
+		}
+	}
+
 	@Override
 	protected void onNewIntent(final Intent intent) {
 		if (xmppConnectionServiceBound) {
@@ -1349,4 +1423,8 @@ public class ConversationActivity extends XmppActivity
 			}
 		});
 	}
+
+	public boolean highlightSelectedConversations() {
+		return !isConversationsOverviewHideable() || this.conversationWasSelectedByKeyboard;
+	}
 }

src/main/java/eu/siacs/conversations/ui/ConversationFragment.java

@@ -857,6 +857,10 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 		updateChatMsgHint();
 	}
 
+	public void setFocusOnInputField() {
+		mEditMessage.requestFocus();
+	}
+
 	enum SendButtonAction {TEXT, TAKE_PHOTO, SEND_LOCATION, RECORD_VOICE, CANCEL, CHOOSE_PICTURE}
 
 	private int getSendButtonImageResource(SendButtonAction action, int status) {

src/main/java/eu/siacs/conversations/ui/adapter/ConversationAdapter.java

@@ -47,7 +47,7 @@ public class ConversationAdapter extends ArrayAdapter<Conversation> {
 		if (this.activity instanceof ConversationActivity) {
 			View swipeableItem = view.findViewById(R.id.swipeable_item);
 			ConversationActivity a = (ConversationActivity) this.activity;
-			int c = !a.isConversationsOverviewHideable() && conversation == a.getSelectedConversation() ? a.getSecondaryBackgroundColor() : a.getPrimaryBackgroundColor();
+			int c = a.highlightSelectedConversations() && conversation == a.getSelectedConversation() ? a.getSecondaryBackgroundColor() : a.getPrimaryBackgroundColor();
 			swipeableItem.setBackgroundColor(c);
 		}
 		TextView convName = (TextView) view.findViewById(R.id.conversation_name);