Link previews for detail statuses (#424)

* implement link preview cards on detail statuses

* cleanup code

app/src/main/java/com/keylesspalace/tusky/entity/Card.java

@@ -0,0 +1,96 @@
+/* Copyright 2017 Andrew Dawson
+ *
+ * This file is a part of Tusky.
+ *
+ * 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.
+ *
+ * Tusky 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 Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+
+package com.keylesspalace.tusky.entity;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+import android.text.Spanned;
+
+import com.google.gson.annotations.SerializedName;
+import com.keylesspalace.tusky.util.HtmlUtils;
+
+public class Card implements Parcelable {
+
+    public String url;
+
+    public String title;
+
+    public String description;
+
+    public String image;
+
+    public String type;
+
+    public int width;
+
+    public int height;
+
+    @Override
+    public int hashCode() {
+        return url.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if (this.url == null) {
+            return this == other;
+        } else if (!(other instanceof Card)) {
+            return false;
+        }
+        Card account = (Card) other;
+        return account.url.equals(this.url);
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeString(url);
+        dest.writeString(title);
+        dest.writeString(description);
+        dest.writeString(image);
+        dest.writeString(type);
+        dest.writeInt(width);
+        dest.writeInt(height);
+    }
+
+    public Card() {}
+
+    private Card(Parcel in) {
+        url = in.readString();
+        title = in.readString();
+        description = in.readString();
+        image = in.readString();
+        type = in.readString();
+        width = in.readInt();
+        height = in.readInt();
+    }
+
+    public static final Creator<Card> CREATOR = new Creator<Card>() {
+        @Override
+        public Card createFromParcel(Parcel source) {
+            return new Card(source);
+        }
+
+        @Override
+        public Card[] newArray(int size) {
+            return new Card[size];
+        }
+    };
+}