Новинки в support-library

1. Новинки в
support-library
Ждут своего часа.
Гончаров Степан
Android Developer

2. Android L
RecyclerView
CardView
Palette

3. Использование
Android Studio 0.8+, support lib 21.0.0rc1
compile 'com.android.support:cardview-v7:+'
compile 'com.android.support:recyclerview-v7:+'
compile 'com.android.support:palette-v7:+'

4. (Не)только для L
v7 || minSdkVersion 'L'

5. И так сойдет
New Manifest Merger
xmlns:tools="http://schemas.android.com/tools"
...
<uses-sdk tools:node="replace" />

6. Можно начинать
Recycler View
Layout Manager
Items Animator
Adapter Data set

7. В чем разница?
ListView <= RecyclerView + LinearLayoutManager
HORISONTAL || VERTICAL

8. В чем проблема?
Adapter
LinearLayoutManager
DefaultAnimator
…
PROFIT

9. Cursor Adapter
@Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(itemLayout, parent, false);
return new ViewHolder(v, textViewId);
}
@Override public void onBindViewHolder(ViewHolder holder, int position) {
if (cursor == null) return;
cursor.moveToPosition(position);
holder.text.setText(cursor.getString(columnIndex));
holder.itemView.setOnClickListener(this);
}

10. View Holder
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView text;
public ViewHolder(View itemView, int textViewId) {
super(itemView);
itemView.setTag(this);
text = (TextView) itemView.findViewById(textViewId);
}
}

11. Card View
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
card_view:cardCornerRadius="4dp"
card_view:cardBackgroundColor="#ffffff"
android:foreground="?android:attr/selectableItemBackground"
>

13. Palette

14. 6 цветов хватит всем
Vibrant(Normal, Light, Dark)
Muted(Normal, Light, Dark)

15. Где взять?
BitmapDrawable bitmapDrawable = (BitmapDrawable) getWallpaper();
Palette palette = Palette.generate(bitmapDrawable.getBitmap());
palette.getLightVibrantColor().getRgb();
palette.getDarkMutedColor().getHsl();
palette.getPallete();

16. Спасибо за внимание!
Demo проект ищите здесь:
https://github.com/stepango/support_library_21_demo