<?xml version="1.0" encoding="utf-8"?>

<GridView
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"
	app:layout_behavior="@string/appbar_scrolling_view_behavior"
	tools:context="de.christinecoenen.code.zapp.ChannelListActivity"
	tools:showIn="@layout/activity_channel_list"
	android:id="@+id/gridview_channels"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:columnWidth="300dp"
	android:numColumns="auto_fit"
	android:verticalSpacing="10dp"
	android:horizontalSpacing="10dp"
	android:stretchMode="columnWidth"
	android:gravity="center"
	android:clipToPadding="false"/>

<?xml version="1.0" encoding="utf-8"?>

<GridView
	xmlns:android="http://schemas.android.com/apk/res/android"
	xmlns:app="http://schemas.android.com/apk/res-auto"
	xmlns:tools="http://schemas.android.com/tools"
	app:layout_behavior="@string/appbar_scrolling_view_behavior"
	tools:context="de.christinecoenen.code.zapp.ChannelListActivity"
	tools:showIn="@layout/activity_channel_list"
	android:id="@+id/gridview_channels"
	android:layout_width="match_parent"
	android:layout_height="match_parent"
	android:columnWidth="350dp"
	android:numColumns="auto_fit"
	android:verticalSpacing="10dp"
	android:horizontalSpacing="10dp"
	android:stretchMode="columnWidth"
	android:gravity="center"
	android:clipToPadding="false"/>

Increase channel grid item width
Increase channel grid item width
