Display user name and user icon in each post when loading posts in specific subreddits.

app/src/main/java/User/FetchUserData.java

@@ -0,0 +1,50 @@
+package User;
+
+import android.support.annotation.NonNull;
+import android.util.Log;
+
+import ml.docilealligator.infinityforreddit.RedditAPI;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Retrofit;
+
+public class FetchUserData {
+    public interface FetchUserDataListener {
+        void onFetchUserDataSuccess(User user);
+        void onFetchUserDataFail();
+    }
+
+    public static void fetchUserData(final Retrofit retrofit, String userName,
+                              final FetchUserDataListener fetchUserDataListener) {
+        RedditAPI api = retrofit.create(RedditAPI.class);
+
+        Call<String> userInfo = api.getUserData(userName);
+        userInfo.enqueue(new Callback<String>() {
+            @Override
+            public void onResponse(@NonNull Call<String> call, @NonNull retrofit2.Response<String> response) {
+                if(response.isSuccessful()) {
+                    ParseUserData.parseMyInfo(response.body(), new ParseUserData.ParseUserDataListener() {
+                        @Override
+                        public void onParseUserDataSuccess(User user) {
+                            fetchUserDataListener.onFetchUserDataSuccess(user);
+                        }
+
+                        @Override
+                        public void onParseUserDataFail() {
+                            fetchUserDataListener.onFetchUserDataFail();
+                        }
+                    });
+                } else {
+                    Log.i("call failed", response.message());
+                    fetchUserDataListener.onFetchUserDataFail();
+                }
+            }
+
+            @Override
+            public void onFailure(@NonNull Call<String> call, @NonNull Throwable t) {
+                Log.i("call failed", t.getMessage());
+                fetchUserDataListener.onFetchUserDataFail();
+            }
+        });
+    }
+}

app/src/main/java/User/ParseUserData.java

@@ -0,0 +1,72 @@
+package User;
+
+import android.os.AsyncTask;
+import android.util.Log;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import ml.docilealligator.infinityforreddit.JSONUtils;
+
+public class ParseUserData {
+    interface ParseUserDataListener {
+        void onParseUserDataSuccess(User user);
+        void onParseUserDataFail();
+    }
+
+    static void parseMyInfo(String response, ParseUserDataListener parseUserDataListener) {
+        new ParseUserDataAsyncTask(response, parseUserDataListener).execute();
+    }
+
+    private static class ParseUserDataAsyncTask extends AsyncTask<Void, Void, Void> {
+        private JSONObject jsonResponse;
+        private ParseUserDataListener parseUserDataListener;
+        private boolean parseFailed;
+
+        private User user;
+
+        ParseUserDataAsyncTask(String response, ParseUserDataListener parseUserDataListener){
+            try {
+                jsonResponse = new JSONObject(response);
+                this.parseUserDataListener = parseUserDataListener;
+                parseFailed = false;
+            } catch (JSONException e) {
+                Log.i("user data json error", e.getMessage());
+                parseUserDataListener.onParseUserDataFail();
+            }
+        }
+
+        @Override
+        protected Void doInBackground(Void... voids) {
+            try {
+                jsonResponse = jsonResponse.getJSONObject(JSONUtils.DATA_KEY);
+                String userName = jsonResponse.getString(JSONUtils.NAME_KEY);
+                String iconImageUrl = jsonResponse.getString(JSONUtils.ICON_IMG_KEY);
+                String bannerImageUrl = "";
+                if(!jsonResponse.isNull(JSONUtils.SUBREDDIT_KEY)) {
+                    bannerImageUrl = jsonResponse.getJSONObject(JSONUtils.SUBREDDIT_KEY).getString(JSONUtils.BANNER_IMG_KEY);
+                }
+                int linkKarma = jsonResponse.getInt(JSONUtils.LINK_KARMA_KEY);
+                int commentKarma = jsonResponse.getInt(JSONUtils.COMMENT_KARMA_KEY);
+                int karma = linkKarma + commentKarma;
+                boolean isGold = jsonResponse.getBoolean(JSONUtils.IS_GOLD_KEY);
+                boolean isFriend = jsonResponse.getBoolean(JSONUtils.IS_FRIEND_KEY);
+
+                user = new User(userName, iconImageUrl, bannerImageUrl, karma, isGold, isFriend);
+            } catch (JSONException e) {
+                parseFailed = true;
+                Log.i("parse user data error", e.getMessage());
+            }
+            return null;
+        }
+
+        @Override
+        protected void onPostExecute(Void aVoid) {
+            if(!parseFailed) {
+                parseUserDataListener.onParseUserDataSuccess(user);
+            } else {
+                parseUserDataListener.onParseUserDataFail();
+            }
+        }
+    }
+}

app/src/main/java/User/User.java

@@ -0,0 +1,58 @@
+package User;
+
+import android.arch.persistence.room.ColumnInfo;
+import android.arch.persistence.room.Entity;
+import android.arch.persistence.room.PrimaryKey;
+import android.support.annotation.NonNull;
+
+@Entity(tableName = "users")
+public class User {
+    @PrimaryKey
+    @NonNull
+    @ColumnInfo(name = "user_name")
+    private String userName;
+    @ColumnInfo(name = "icon")
+    private String icon;
+    @ColumnInfo(name = "banner")
+    private String banner;
+    @ColumnInfo(name = "karma")
+    private int karma;
+    @ColumnInfo(name = "is_gold")
+    private boolean isGold;
+    @ColumnInfo(name = "is_friend")
+    private boolean isFriend;
+
+    User(@NonNull String userName, String icon, String banner, int karma, boolean isGold, boolean isFriend) {
+        this.userName = userName;
+        this.icon = icon;
+        this.banner = banner;
+        this.karma = karma;
+        this.isGold = isGold;
+        this.isFriend = isFriend;
+    }
+
+    @NonNull
+    public String getUserName() {
+        return userName;
+    }
+
+    public String getIcon() {
+        return icon;
+    }
+
+    public String getBanner() {
+        return banner;
+    }
+
+    public int getKarma() {
+        return karma;
+    }
+
+    public boolean isGold() {
+        return isGold;
+    }
+
+    public boolean isFriend() {
+        return isFriend;
+    }
+}

app/src/main/java/User/UserDao.java

@@ -0,0 +1,18 @@
+package User;
+
+import android.arch.persistence.room.Dao;
+import android.arch.persistence.room.Insert;
+import android.arch.persistence.room.OnConflictStrategy;
+import android.arch.persistence.room.Query;
+
+@Dao
+public interface UserDao {
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    void insert(User user);
+
+    @Query("DELETE FROM users")
+    void deleteAllUsers();
+
+    @Query("SELECT * FROM users WHERE user_name = :userName LIMIT 1")
+    User getUserData(String userName);
+}

app/src/main/java/User/UserData.java

@@ -1,4 +0,0 @@
-package User;
-
-public class UserData {
-}

app/src/main/java/User/UserRoomDatabase.java

@@ -0,0 +1,26 @@
+package User;
+
+import android.arch.persistence.room.Database;
+import android.arch.persistence.room.Room;
+import android.arch.persistence.room.RoomDatabase;
+import android.content.Context;
+
+@Database(entities = {User.class}, version = 1)
+public abstract class UserRoomDatabase extends RoomDatabase {
+    private static UserRoomDatabase INSTANCE;
+
+    public abstract UserDao userDao();
+
+    public static UserRoomDatabase getDatabase(final Context context) {
+        if(INSTANCE == null) {
+            synchronized (UserRoomDatabase.class) {
+                if(INSTANCE == null) {
+                    INSTANCE = Room.databaseBuilder(context.getApplicationContext(),
+                            UserRoomDatabase.class, "users")
+                            .build();
+                }
+            }
+        }
+        return INSTANCE;
+    }
+}