From a1f9aab852f26b50f58c5867af228ffa2db930c4 Mon Sep 17 00:00:00 2001
From: Negue <eugen.bolz@gmail.com>
Date: Tue, 13 Dec 2016 21:04:15 +0100
Subject: [PATCH] join / leave a challenge, open profile of the challenge
 leader, multiple fixes

---
 Habitica/res/layout/challenge_item.xml        | 115 ++++++++++++------
 Habitica/res/values/strings.xml               |   4 +
 .../events/commands/JoinChallengeCommand.java |  11 ++
 .../commands/LeaveChallengeCommand.java       |   9 ++
 .../activities/ChallengeDetailActivity.java   |  54 +++++++-
 .../social/ChallengesListViewAdapter.java     |  62 +++++++++-
 .../challenges/ChallengeListFragment.java     |  38 +++---
 .../ChallengesOverviewFragment.java           |  43 ++++++-
 .../habitrpgwrapper/lib/api/ApiService.java   |   8 ++
 .../lib/models/HabitRPGUser.java              |   4 +
 .../lib/utils/ChallengeDeserializer.java      |   1 +
 11 files changed, 279 insertions(+), 70 deletions(-)
 create mode 100644 Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/JoinChallengeCommand.java
 create mode 100644 Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/LeaveChallengeCommand.java

diff --git a/Habitica/res/layout/challenge_item.xml b/Habitica/res/layout/challenge_item.xml
index 805e0e049..74f5c17f6 100644
--- a/Habitica/res/layout/challenge_item.xml
+++ b/Habitica/res/layout/challenge_item.xml
@@ -2,10 +2,10 @@
 <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/card_view"
     style="@style/CardView.Default"
-    android:clickable="true"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
-    android:layout_margin="5dp">
+    android:layout_margin="5dp"
+    android:clickable="true">
 
     <LinearLayout
         style="@style/CardContent.Compact"
@@ -17,46 +17,86 @@
         <TextView
             android:id="@+id/challenge_name"
             android:layout_width="match_parent"
-            android:textStyle="bold"
-            android:layout_height="wrap_content" />
+            android:layout_height="wrap_content"
+            android:textStyle="bold" />
 
         <TextView
             android:id="@+id/challenge_description"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:lines="3"/>
+            android:maxLines="3" />
 
         <LinearLayout
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
+            android:layout_marginTop="10dp"
             android:baselineAligned="false"
             android:weightSum="1.0">
 
             <LinearLayout
                 android:layout_width="0dp"
-                android:layout_height="wrap_content"
+
+                android:layout_height="30dp"
                 android:layout_weight="0.5">
 
-
-                <TextView
-                    android:id="@+id/leader_label"
+                <LinearLayout
+                    android:id="@+id/user_background_layout"
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
+                    android:layout_gravity="left|center"
+                    android:background="@drawable/layout_rounded_bg"
+                    android:backgroundTint="@color/days_gray">
 
-                    android:ellipsize="middle"
-                    android:lines="1" />
-
+                    <TextView
+                        android:id="@+id/user_label"
+                        style="@style/ChatMessageUserTextViewStyle"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_margin="5dp"
+                        android:ellipsize="middle"
+                        android:text="design_data"
+                        android:lines="1" />
+                </LinearLayout>
             </LinearLayout>
 
             <LinearLayout
                 android:layout_width="0dp"
-                android:layout_height="wrap_content"
+                android:layout_height="30dp"
                 android:layout_weight="0.5"
-                android:gravity="right">
+                android:gravity="right|fill_vertical">
+
+                <LinearLayout
+                    android:id="@+id/gem_prize_layout"
+                    android:layout_width="wrap_content"
+                    android:layout_height="30dp"
+                    android:layout_marginEnd="15dp"
+                    android:layout_marginRight="15dp"
+                    android:gravity="end">
+
+                    <ImageView
+                        android:layout_width="20dp"
+                        android:layout_height="20dp"
+                        android:layout_gravity="center"
+                        android:src="@drawable/ic_header_gem" />
+
+                    <TextView
+                        android:id="@+id/gemPrizeTextView"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_gravity="center"
+                        android:ellipsize="middle"
+                        android:lines="1"
+                        android:paddingLeft="5dp"
+                        android:paddingStart="5dp"
+                        android:text="0" />
+
+
+                </LinearLayout>
 
                 <ImageView
                     android:layout_width="20dp"
                     android:layout_height="20dp"
+                    android:layout_gravity="center"
                     android:src="@drawable/ic_people_black_24dp" />
 
                 <TextView
@@ -77,37 +117,36 @@
         <LinearLayout
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
-            android:baselineAligned="false"
-            android:gravity="end"
-            android:weightSum="1.0">
+            android:baselineAligned="false">
 
             <LinearLayout
-                android:id="@+id/gem_prize_layout"
-                android:layout_width="0dp"
+                android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:layout_weight="0.5"
-                android:gravity="end">
+                android:layout_weight="1">
 
-                <ImageView
-                    android:layout_width="20dp"
-                    android:layout_height="20dp"
-                    android:src="@drawable/ic_header_gem" />
-
-                <TextView
-                    android:id="@+id/gemPrizeTextView"
+                <Button
+                    android:id="@+id/challenge_button_leave"
+                    style="@style/Widget.AppCompat.Button.Borderless"
                     android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:layout_gravity="center"
-                    android:ellipsize="middle"
-                    android:lines="1"
-                    android:paddingLeft="5dp"
-                    android:paddingStart="5dp"
-                    android:text="0" />
-
-
+                    android:layout_height="match_parent"
+                    android:gravity="start|fill_vertical"
+                    android:text="@string/leave"
+                    android:textColor="@color/md_red_400" />
             </LinearLayout>
 
-        </LinearLayout>
+            <LinearLayout
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:gravity="end|fill_vertical">
 
+                <Button
+                    android:id="@+id/challenge_button_join"
+                    style="@style/Widget.AppCompat.Button.Borderless"
+                    android:layout_width="wrap_content"
+                    android:layout_height="match_parent"
+                    android:text="@string/join" />
+            </LinearLayout>
+        </LinearLayout>
     </LinearLayout>
 </android.support.v7.widget.CardView>
\ No newline at end of file
diff --git a/Habitica/res/values/strings.xml b/Habitica/res/values/strings.xml
index 22960f45d..7d0d2b038 100644
--- a/Habitica/res/values/strings.xml
+++ b/Habitica/res/values/strings.xml
@@ -438,4 +438,8 @@ To start, which parts of your life do you want to improve?</string>
     <string name="AudioTheme_summary">Change Habitica\'s Audio Theme</string>
     <string name="byLeader">by %s</string>
     <string name="challenge_details">Challenge Details</string>
+    <string name="challenge_leave_title">Are you sure?</string>
+    <string name="challenge_leave_text">Are you sure you want to leave the Challenge "%s"?</string>
+    <string name="my_challenges">My Challenges</string>
+    <string name="public_challenges">Public</string>
 </resources>
diff --git a/Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/JoinChallengeCommand.java b/Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/JoinChallengeCommand.java
new file mode 100644
index 000000000..33417ab4f
--- /dev/null
+++ b/Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/JoinChallengeCommand.java
@@ -0,0 +1,11 @@
+package com.habitrpg.android.habitica.events.commands;
+
+public class JoinChallengeCommand {
+    public String challengeId;
+
+    public JoinChallengeCommand(String challengeId){
+        this.challengeId = challengeId;
+    }
+}
+
+
diff --git a/Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/LeaveChallengeCommand.java b/Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/LeaveChallengeCommand.java
new file mode 100644
index 000000000..f7a5e59c5
--- /dev/null
+++ b/Habitica/src/main/java/com/habitrpg/android/habitica/events/commands/LeaveChallengeCommand.java
@@ -0,0 +1,9 @@
+package com.habitrpg.android.habitica.events.commands;
+
+public class LeaveChallengeCommand {
+    public String challengeId;
+
+    public LeaveChallengeCommand(String challengeId){
+        this.challengeId = challengeId;
+    }
+}
diff --git a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/activities/ChallengeDetailActivity.java b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/activities/ChallengeDetailActivity.java
index e756c0fcc..e35ec1cbb 100644
--- a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/activities/ChallengeDetailActivity.java
+++ b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/activities/ChallengeDetailActivity.java
@@ -3,18 +3,23 @@ package com.habitrpg.android.habitica.ui.activities;
 import android.os.Bundle;
 import android.support.design.widget.TabLayout;
 import android.support.v4.app.FragmentTransaction;
+import android.support.v7.widget.RecyclerView;
 import android.support.v7.widget.Toolbar;
+import android.view.View;
+import android.widget.LinearLayout;
+import android.widget.TextView;
 
 import com.habitrpg.android.habitica.APIHelper;
 import com.habitrpg.android.habitica.HabiticaApplication;
 import com.habitrpg.android.habitica.R;
 import com.habitrpg.android.habitica.components.AppComponent;
-import com.habitrpg.android.habitica.ui.adapter.social.ChallengesListViewAdapter.ChallengeViewHolder;
 import com.habitrpg.android.habitica.ui.fragments.social.challenges.ChallengeTasksFragment;
+import com.magicmicky.habitrpgwrapper.lib.models.Challenge;
 
 import javax.inject.Inject;
 
 import butterknife.BindView;
+import butterknife.ButterKnife;
 
 public class ChallengeDetailActivity extends BaseActivity {
 
@@ -73,4 +78,51 @@ public class ChallengeDetailActivity extends BaseActivity {
     protected void injectActivity(AppComponent component) {
         component.inject(this);
     }
+
+    public static class ChallengeViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
+        @BindView(R.id.challenge_name)
+        TextView challengeName;
+
+        @BindView(R.id.challenge_description)
+        TextView challengeDescription;
+
+
+        @BindView(R.id.memberCountTextView)
+        TextView memberCountTextView;
+
+        @BindView(R.id.gem_prize_layout)
+        LinearLayout gem_prize_layout;
+
+        @BindView(R.id.gemPrizeTextView)
+        TextView gemPrizeTextView;
+
+        private Challenge challenge;
+
+        public ChallengeViewHolder(View itemView) {
+            super(itemView);
+
+            ButterKnife.bind(this, itemView);
+        }
+
+        public void bind(Challenge challenge) {
+            this.challenge = challenge;
+
+            challengeName.setText(challenge.name);
+            challengeDescription.setText(challenge.description);
+
+            memberCountTextView.setText(challenge.memberCount + "");
+
+            if (challenge.prize == 0) {
+                gem_prize_layout.setVisibility(View.GONE);
+            } else {
+                gem_prize_layout.setVisibility(View.VISIBLE);
+                gemPrizeTextView.setText(challenge.prize + "");
+            }
+        }
+
+        @Override
+        public void onClick(View view) {
+
+        }
+    }
 }
diff --git a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/adapter/social/ChallengesListViewAdapter.java b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/adapter/social/ChallengesListViewAdapter.java
index 14c21dea8..abcc90884 100644
--- a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/adapter/social/ChallengesListViewAdapter.java
+++ b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/adapter/social/ChallengesListViewAdapter.java
@@ -1,16 +1,22 @@
 package com.habitrpg.android.habitica.ui.adapter.social;
 
+import android.content.Context;
+import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
 import com.habitrpg.android.habitica.R;
+import com.habitrpg.android.habitica.events.commands.JoinChallengeCommand;
+import com.habitrpg.android.habitica.events.commands.LeaveChallengeCommand;
+import com.habitrpg.android.habitica.events.commands.OpenFullProfileCommand;
 import com.habitrpg.android.habitica.events.commands.ShowChallengeTasksCommand;
+import com.habitrpg.android.habitica.ui.helpers.DataBindingUtils;
 import com.magicmicky.habitrpgwrapper.lib.models.Challenge;
-import com.magicmicky.habitrpgwrapper.lib.models.HabitRPGUser;
 
 import org.greenrobot.eventbus.EventBus;
 
@@ -51,6 +57,11 @@ public class ChallengesListViewAdapter extends RecyclerView.Adapter<ChallengesLi
         return challenges.size();
     }
 
+    public void addChallange(Challenge challenge) {
+        challenges.add(challenge);
+        notifyDataSetChanged();
+    }
+
     public static class ChallengeViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
         @BindView(R.id.challenge_name)
         TextView challengeName;
@@ -58,8 +69,6 @@ public class ChallengesListViewAdapter extends RecyclerView.Adapter<ChallengesLi
         @BindView(R.id.challenge_description)
         TextView challengeDescription;
 
-        @BindView(R.id.leader_label)
-        TextView leaderName;
 
         @BindView(R.id.memberCountTextView)
         TextView memberCountTextView;
@@ -70,6 +79,18 @@ public class ChallengesListViewAdapter extends RecyclerView.Adapter<ChallengesLi
         @BindView(R.id.gemPrizeTextView)
         TextView gemPrizeTextView;
 
+        @BindView(R.id.challenge_button_join)
+        Button joinButton;
+
+        @BindView(R.id.challenge_button_leave)
+        Button leaveButton;
+
+        @BindView(R.id.user_background_layout)
+        LinearLayout leaderLayout;
+
+        @BindView(R.id.user_label)
+        TextView leaderLabel;
+
         private Challenge challenge;
 
         public ChallengeViewHolder(View itemView) {
@@ -78,6 +99,13 @@ public class ChallengesListViewAdapter extends RecyclerView.Adapter<ChallengesLi
             ButterKnife.bind(this, itemView);
 
             itemView.setOnClickListener(this);
+            joinButton.setOnClickListener(this);
+            joinButton.setVisibility(View.INVISIBLE);
+
+            leaveButton.setOnClickListener(this);
+            leaveButton.setVisibility(View.INVISIBLE);
+
+            leaderLayout.setOnClickListener(this);
         }
 
         public void bind(Challenge challenge) {
@@ -86,7 +114,9 @@ public class ChallengesListViewAdapter extends RecyclerView.Adapter<ChallengesLi
             challengeName.setText(challenge.name);
             challengeDescription.setText(challenge.description);
 
-            leaderName.setText(String.format(getContext().getString(R.string.byLeader), challenge.leaderName));
+            DataBindingUtils.setRoundedBackgroundInt(leaderLayout, android.R.color.darker_gray);
+            DataBindingUtils.setForegroundTintColor(leaderLabel, android.R.color.white);
+            leaderLabel.setText(String.format(getContext().getString(R.string.byLeader), challenge.leaderName));
 
             memberCountTextView.setText(challenge.memberCount + "");
 
@@ -96,11 +126,33 @@ public class ChallengesListViewAdapter extends RecyclerView.Adapter<ChallengesLi
                 gem_prize_layout.setVisibility(View.VISIBLE);
                 gemPrizeTextView.setText(challenge.prize + "");
             }
+
+            if (leaveButton != null && joinButton != null) {
+                boolean userIdExists = challenge.user_id != null && !challenge.user_id.isEmpty();
+
+                leaveButton.setVisibility(userIdExists ? View.VISIBLE : View.INVISIBLE);
+                joinButton.setVisibility(userIdExists ? View.INVISIBLE : View.VISIBLE);
+            }
         }
 
         @Override
         public void onClick(View view) {
-            if (challenge != null) {
+            if (view == leaderLayout) {
+                EventBus.getDefault().post(new OpenFullProfileCommand(challenge.leaderId));
+            } else if (view == joinButton) {
+                EventBus.getDefault().post(new JoinChallengeCommand(challenge.id));
+            } else if (view == leaveButton) {
+                Context context = view.getContext();
+                new AlertDialog.Builder(context)
+                        .setTitle(context.getString(R.string.challenge_leave_title))
+                        .setMessage(String.format(context.getString(R.string.challenge_leave_text), challenge.name))
+                        .setPositiveButton(context.getString(R.string.yes), (dialog, which) -> {
+                            EventBus.getDefault().post(new LeaveChallengeCommand(challenge.id));
+                        }).setNegativeButton(context.getString(R.string.no), (dialog, which) -> {
+                    dialog.dismiss();
+                }).show();
+            } else if (challenge != null) {
+                // Card tapped
                 EventBus.getDefault().post(new ShowChallengeTasksCommand(challenge.id));
             }
         }
diff --git a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengeListFragment.java b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengeListFragment.java
index bc0d336a8..50ef6c6ad 100644
--- a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengeListFragment.java
+++ b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengeListFragment.java
@@ -4,6 +4,7 @@ import android.os.Bundle;
 import android.support.v4.widget.SwipeRefreshLayout;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -55,7 +56,6 @@ public class ChallengeListFragment extends BaseMainFragment implements View.OnCl
         super.onCreateView(inflater, container, savedInstanceState);
         View v = inflater.inflate(R.layout.fragment_challengeslist, container, false);
         unbinder = ButterKnife.bind(this, v);
-        swipeRefreshLayout.setOnRefreshListener(this);
 
         recyclerView.setLayoutManager(new LinearLayoutManager(this.activity));
         recyclerView.setAdapter(challengeAdapter);
@@ -84,27 +84,14 @@ public class ChallengeListFragment extends BaseMainFragment implements View.OnCl
             query = query.and(Condition.column("user_id").is(user.getId()));
         }
 
-        query.async().queryList(new TransactionListener<List<Challenge>>() {
-            @Override
-            public void onResultReceived(List<Challenge> result) {
-                if (result.size() != 0) {
-                    setAdapterEntries(result);
-                }
+        List<Challenge> challenges = query.queryList();
 
-                // load online challenges & save to database
-                onRefresh();
-            }
+        if (challenges.size() != 0) {
+            setAdapterEntries(challenges);
+        }
 
-            @Override
-            public boolean onReady(BaseTransaction<List<Challenge>> transaction) {
-                return false;
-            }
-
-            @Override
-            public boolean hasResult(BaseTransaction<List<Challenge>> transaction, List<Challenge> result) {
-                return result.size() != 0;
-            }
-        });
+        // load online challenges & save to database
+        onRefresh();
     }
 
     private void fetchOnlineChallenges() {
@@ -146,19 +133,26 @@ public class ChallengeListFragment extends BaseMainFragment implements View.OnCl
                             swipeRefreshLayout.setRefreshing(false);
                         }
                     }, throwable -> {
+                        Log.e("ChallengeListFragment", "", throwable);
+
+                        if (swipeRefreshLayout != null) {
+                            swipeRefreshLayout.setRefreshing(false);
+                        }
                     });
         }
     }
 
 
     private void setAdapterEntries(List<Challenge> challenges) {
-
         challengeAdapter.setChallenges(challenges);
-
     }
 
     @Override
     public void onClick(View v) {
 
     }
+
+    public void addItem(Challenge challenge) {
+        challengeAdapter.addChallange(challenge);
+    }
 }
diff --git a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengesOverviewFragment.java b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengesOverviewFragment.java
index 4a4fc18fc..f6c3084d5 100644
--- a/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengesOverviewFragment.java
+++ b/Habitica/src/main/java/com/habitrpg/android/habitica/ui/fragments/social/challenges/ChallengesOverviewFragment.java
@@ -11,10 +11,15 @@ import android.view.ViewGroup;
 
 import com.habitrpg.android.habitica.R;
 import com.habitrpg.android.habitica.components.AppComponent;
+import com.habitrpg.android.habitica.events.commands.JoinChallengeCommand;
+import com.habitrpg.android.habitica.events.commands.LeaveChallengeCommand;
 import com.habitrpg.android.habitica.events.commands.ShowChallengeTasksCommand;
 import com.habitrpg.android.habitica.ui.activities.ChallengeDetailActivity;
-import com.habitrpg.android.habitica.ui.activities.FullProfileActivity;
 import com.habitrpg.android.habitica.ui.fragments.BaseMainFragment;
+import com.magicmicky.habitrpgwrapper.lib.models.Challenge;
+import com.raizlabs.android.dbflow.sql.language.Delete;
+import com.raizlabs.android.dbflow.sql.language.Select;
+import com.raizlabs.android.dbflow.sql.language.Update;
 
 import org.greenrobot.eventbus.Subscribe;
 
@@ -30,7 +35,6 @@ public class ChallengesOverviewFragment extends BaseMainFragment {
         View v = inflater.inflate(R.layout.fragment_viewpager, container, false);
 
         viewPager = (ViewPager) v.findViewById(R.id.view_pager);
-        viewPager.setCurrentItem(1);
 
         setViewPagerAdapter();
 
@@ -81,9 +85,9 @@ public class ChallengesOverviewFragment extends BaseMainFragment {
             public CharSequence getPageTitle(int position) {
                 switch (position) {
                     case 0:
-                        return "My Challenges";
+                        return getString(R.string.my_challenges);
                     case 1:
-                        return "Public";
+                        return getString(R.string.public_challenges);
                 }
                 return "";
             }
@@ -105,4 +109,35 @@ public class ChallengesOverviewFragment extends BaseMainFragment {
         intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
         startActivity(intent);
     }
+
+    @Subscribe
+    public void onEvent(JoinChallengeCommand cmd){
+        this.apiHelper.apiService.joinChallenge(cmd.challengeId)
+                .compose(apiHelper.configureApiCallObserver())
+                .subscribe(challenge -> {
+                    challenge.user_id = this.user.getId();
+
+                    userChallengesFragment.addItem(challenge);
+                }, throwable -> {
+                });
+    }
+
+    @Subscribe
+    public void onEvent(LeaveChallengeCommand cmd){
+        this.apiHelper.apiService.leaveChallenge(cmd.challengeId)
+                .compose(apiHelper.configureApiCallObserver())
+                .subscribe(aVoid -> {
+
+                    Challenge challenge = new Select().from(Challenge.class).byIds(cmd.challengeId).querySingle();
+                    challenge.user_id = null;
+                    challenge.save();
+
+                    this.user.resetChallengeList();
+
+                    userChallengesFragment.onRefresh();
+                    availableChallengesFragment.onRefresh();
+                }, throwable -> {
+                });
+    }
+
 }
diff --git a/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/api/ApiService.java b/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/api/ApiService.java
index 13b9d9628..502264922 100644
--- a/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/api/ApiService.java
+++ b/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/api/ApiService.java
@@ -261,6 +261,8 @@ public interface ApiService {
     @DELETE("user/push-devices/{regId}")
     Observable<Void> deletePushDevice(@Path("regId") String regId);
 
+    /* challenges api */
+
     @GET("challenges/user")
     Observable<ArrayList<Challenge>> getUserChallenges();
 
@@ -270,6 +272,12 @@ public interface ApiService {
     @GET("challenges/{challengeId}")
     Observable<Challenge> getChallenge(@Path("challengeId") String challengeId);
 
+    @POST("challenges/{challengeId}/join")
+    Observable<Challenge> joinChallenge(@Path("challengeId") String challengeId);
+
+    @POST("challenges/{challengeId}/leave")
+    Observable<Void> leaveChallenge(@Path("challengeId") String challengeId);
+
     //DEBUG: These calls only work on a local development server
 
     @POST("debug/add-ten-gems")
diff --git a/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/models/HabitRPGUser.java b/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/models/HabitRPGUser.java
index de69e4b6c..6410844ea 100644
--- a/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/models/HabitRPGUser.java
+++ b/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/models/HabitRPGUser.java
@@ -126,6 +126,10 @@ public class HabitRPGUser extends BaseModel {
         this.challengeList = challenges;
     }
 
+    public void resetChallengeList(){
+        challengeList = null;
+    }
+
     public Preferences getPreferences() {
         return preferences;
     }
diff --git a/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/utils/ChallengeDeserializer.java b/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/utils/ChallengeDeserializer.java
index a13de0a8e..a36937a5c 100644
--- a/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/utils/ChallengeDeserializer.java
+++ b/Habitica/src/main/java/com/magicmicky/habitrpgwrapper/lib/utils/ChallengeDeserializer.java
@@ -40,6 +40,7 @@ public class ChallengeDeserializer implements JsonDeserializer<Challenge> {
 
                 if (profile != null) {
                     challenge.leaderName = profile.get("name").getAsString();
+                    challenge.leaderId = leaderObj.get("id").getAsString();
                 }
             }
         }