Artist view multi select support.

app/src/main/java/com/kabouzeid/gramophone/model/Artist.java

@@ -1,5 +1,7 @@
 package com.kabouzeid.gramophone.model;
 
+import android.text.TextUtils;
+
 /**
  * @author Karim Abou Zeid (kabouzeid)
  */
@@ -22,4 +24,44 @@ public class Artist {
         songCount = -1;
         albumCount = -1;
     }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + albumCount;
+        result = prime * result + id;
+        result = prime * result + (name == null ? 0 : name.hashCode());
+        result = prime * result + songCount;
+        return result;
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        final Artist other = (Artist) obj;
+        if (albumCount != other.albumCount) {
+            return false;
+        }
+        if (id != other.id) {
+            return false;
+        }
+        if (!TextUtils.equals(name, other.name)) {
+            return false;
+        }
+        return songCount == other.songCount;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
 }