add presenter and layout for header items

app/src/main/java/de/nicidienase/chaosflix/HeaderItemPresenter.java

@@ -0,0 +1,53 @@
+package de.nicidienase.chaosflix;
+
+import android.content.Context;
+import android.support.v17.leanback.widget.HeaderItem;
+import android.support.v17.leanback.widget.ListRow;
+import android.support.v17.leanback.widget.Presenter;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import butterknife.BindView;
+import de.nicidienase.chaosflix.entities.recording.Conference;
+import de.nicidienase.chaosflix.entities.streaming.LiveConference;
+
+/**
+ * Created by felix on 16.04.17.
+ */
+
+public class HeaderItemPresenter extends Presenter {
+	@Override
+	public ViewHolder onCreateViewHolder(ViewGroup parent) {
+		LayoutInflater inflater = (LayoutInflater) parent.getContext()
+				.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
+		View view = inflater.inflate(R.layout.header_item_layout, null);
+
+		return new ViewHolder(view);
+	}
+
+	@Override
+	public void onBindViewHolder(ViewHolder viewHolder, Object item) {
+		HeaderItem headerItem = ((ListRow) item).getHeaderItem();
+		View view = viewHolder.view;
+		ImageView headerIcon = (ImageView) view.findViewById(R.id.header_icon);
+		TextView headerLabel = (TextView) view.findViewById(R.id.header_label);
+
+		if(item instanceof Conference){
+			Conference con = (Conference) item;
+
+			headerLabel.setText(con.getTitle());
+		} else if(item instanceof LiveConference){
+			LiveConference con = (LiveConference) item;
+
+			headerLabel.setText(con.getConference());
+		}
+	}
+
+	@Override
+	public void onUnbindViewHolder(ViewHolder viewHolder) {
+
+	}
+}

app/src/main/res/layout/header_item_layout.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="horizontal"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/header_icon"
+        android:layout_width="32dp"
+        android:layout_height="32dp" />
+    <TextView
+        android:id="@+id/header_label"
+        android:layout_marginTop="6dp"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+</LinearLayout>