From 53e4f3d73cb1e4ac906ad13c245bc6c1f45f0640 Mon Sep 17 00:00:00 2001
From: Eder Bastos <bastos.eder@gmail.com>
Date: Tue, 24 Jun 2014 22:27:34 -0400
Subject: [PATCH] Implement ViewHolder pattern on the GameListAdapter.

---
 .../dolphinemu/gamelist/GameListAdapter.java  | 57 ++++++++++++-------
 1 file changed, 37 insertions(+), 20 deletions(-)

diff --git a/Source/Android/src/org/dolphinemu/dolphinemu/gamelist/GameListAdapter.java b/Source/Android/src/org/dolphinemu/dolphinemu/gamelist/GameListAdapter.java
index 8ce1afd216..30796593ca 100644
--- a/Source/Android/src/org/dolphinemu/dolphinemu/gamelist/GameListAdapter.java
+++ b/Source/Android/src/org/dolphinemu/dolphinemu/gamelist/GameListAdapter.java
@@ -41,38 +41,55 @@ public final class GameListAdapter extends ArrayAdapter<GameListItem>
 	}
 
 	@Override
-	public View getView(int position, View convertView, ViewGroup parent)
+	public View getView(int position, View gameView, ViewGroup parent)
 	{
-		if (convertView == null)
+		ViewHolder holder;
+
+		// If getView() was called without passing in a recycled view,
+		if (gameView == null)
 		{
-			LayoutInflater vi = LayoutInflater.from(context);
-			convertView = vi.inflate(id, parent, false);
+			// Inflate a new view using the appropriate XML layout.
+			LayoutInflater inflater = LayoutInflater.from(context);
+			gameView = inflater.inflate(id, parent, false);
+
+			// Instantiate a holder to contain references to the game's views.
+			holder = new ViewHolder();
+			holder.title    = (TextView) gameView.findViewById(R.id.GameListItemTitle);
+			holder.subtitle = (TextView) gameView.findViewById(R.id.GameListItemSubTitle);
+			holder.icon    = (ImageView) gameView.findViewById(R.id.GameListItemIcon);
+
+			// Attach this list of references to the view.
+			gameView.setTag(holder);
+		}
+		// If we do have a recycled view, we can use the references it already contains.
+		else
+		{
+			holder = (ViewHolder) gameView.getTag();
 		}
 
+		// Get a reference to the game represented by this row.
 		final GameListItem item = getItem(position);
+
+		// Whether this row's view is newly created or not, set the children to contain the game's data.
 		if (item != null)
 		{
-			TextView title    = (TextView) convertView.findViewById(R.id.GameListItemTitle);
-			TextView subtitle = (TextView) convertView.findViewById(R.id.GameListItemSubTitle);
-			ImageView icon    = (ImageView) convertView.findViewById(R.id.GameListItemIcon);
-
-			if (title != null)
-				title.setText(item.getName());
-
-			if (subtitle != null)
-				subtitle.setText(item.getData());
-
-			if (icon != null)
-			{
-				icon.setImageBitmap(item.getImage());
-			}
+			holder.title.setText(item.getName());
+			holder.subtitle.setText(item.getData());
+			holder.icon.setImageBitmap(item.getImage());
 		}
 
 		// Make every other game in the list grey
 		if (position % 2 == 1)
-			convertView.setBackgroundColor(0xFFE3E3E3);
+			gameView.setBackgroundColor(0xFFE3E3E3);
 
-		return convertView;
+		return gameView;
+	}
+
+	private final class ViewHolder
+	{
+		public TextView title;
+		public TextView subtitle;
+		public ImageView icon;
 	}
 }