Following Google IO I'm always that much more inspired to try a few new things with Android.
Shortly after IO I noticed this new post on the devlopers blog:
http://android-developers.blogspot.co.uk/2015/05/android-design-support-library.html
I immediately loved the CollapsingToolbarLayout as I've had to make something similar myself and never quite got it perfect. The fact that Google are releasing quick and easy ways to implement these design elements is absolutely fantastic. Long may it continue!
When I saw Ian Lake's post on this collapsing toolbar I was super keen to give them a go:
https://plus.google.com/+IanLake/posts/QGR5XNcPPeG
I didn't get especially far until this example from Chris Banes:
https://github.com/chrisbanes/cheesesquare
I decided (as usual) to make mine as simple as possible, stripping out as much of the superfluous stuff as I could.
First we need the support and design libraries:
compile 'com.android.support:appcompat-v7:22.2.0'
compile 'com.android.support:design:22.2.0'
compile 'com.android.support:recyclerview-v7:22.2.0'
First thing we'll do is the xml for our main activity
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:layout_scrollFlags="scroll|enterAlways" />
<TextView
android:text="@string/hello_world"
android:padding="20dp"
android:layout_width="match_parent"
android:textColor="#00FF00"
android:layout_height="wrap_content"/>
</android.support.design.widget.AppBarLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/activity_main_listview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
The important bit here is the AppBarLayout which contains the Toolbar and a TextView which I want to hover over the top of the listview.
Second you'll notice we're using a RecyclerView which is new to me but looks to be more powerful than Listview.
Our ActivityMain just passes an ArrayList of Strings too the Recycler View
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.activity_main_listview);
recyclerView.setLayoutManager(new LinearLayoutManager(recyclerView.getContext()));
recyclerView.setAdapter(new MyRecyclerView(this, players));
Oh and of course don't forget to make sure your Activity uses AppCompatActivity and your manifest has a theme which overrides or implements Theme.AppCompat.Light.NoActionBar
You'll need the MyRecylcerView class but that's fairly boring and I borrowed most of it from Chris Banes, so I'll let you look at that in the git repo (bottom).
Now we need to look at the detail page where we use CollapsingToolbarLayout. First the xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="400dp"
android:theme="@style/ActionBarPopupThemeOverlay"
android:fitsSystemWindows="true">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_scrollFlags="scroll|exitUntilCollapsed"
android:fitsSystemWindows="true"
app:contentScrim="@color/colorPrimary"
app:expandedTitleMarginStart="48dp"
app:expandedTitleMarginEnd="64dp">
<ImageView
android:id="@+id/backdrop"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:theme="@style/ActionBarPopupThemeOverlay"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="24dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="All your base are belong to me." />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="20dp"
android:textColor="@color/colorAccent"
android:text="All your base are belong to me." />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.design.widget.CoordinatorLayout>
Here we use a NestedScrollView instead of a RecyclerView, hence the big list of TextViews
The Activity is even simpler here, we read in the extra and setup the toolbar title and background image, then setup the action bar so it's an up navaigation and set the title:
final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
CollapsingToolbarLayout collapsingToolbar = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
collapsingToolbar.setTitle(muppetName);
That's basically it, a few new concepts and tools here but its super easy.
Here's the GitHub repo of all of this:
https://github.com/jimbo1299/androiddesigntest
