prebuilts/androidtv/leanback/app/src/main/java/com/example/android/leanback/CardPresenter.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package com.example.android.leanback;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.support.v17.leanback.widget.ImageCardView;
import android.support.v17.leanback.widget.Presenter;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;

import com.squareup.picasso.Picasso;
import com.squareup.picasso.Target;

import java.net.URI;

/*
 * A CardPresenter is used to generate Views and bind Objects to them on demand. 
 * It contains an Image CardView
 */
public class CardPresenter extends Presenter {
    private static final String TAG = "CardPresenter";

    private static Context mContext;
    private static int CARD_WIDTH = 313;
    private static int CARD_HEIGHT = 176;

    static class ViewHolder extends Presenter.ViewHolder {
        private Movie mMovie;
        private ImageCardView mCardView;
        private Drawable mDefaultCardImage;
        private PicassoImageCardViewTarget mImageCardViewTarget;

        public ViewHolder(View view) {
            super(view);
            mCardView = (ImageCardView) view;
            mImageCardViewTarget = new PicassoImageCardViewTarget(mCardView);
            mDefaultCardImage = mContext.getResources().getDrawable(R.drawable.movie);
        }

        public void setMovie(Movie m) {
            mMovie = m;
        }

        public Movie getMovie() {
            return mMovie;
        }

        public ImageCardView getCardView() {
            return mCardView;
        }

        protected void updateCardViewImage(URI uri) {
            Picasso.with(mContext)
                    .load(uri.toString())
                    .resize(Utils.dpToPx(CARD_WIDTH, mContext), Utils.dpToPx(CARD_HEIGHT, mContext))
                    .error(mDefaultCardImage)
                    .into(mImageCardViewTarget);
        }
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent) {
        Log.d(TAG, "onCreateViewHolder");
        mContext = parent.getContext();

        ImageCardView cardView = new ImageCardView(mContext);
        cardView.setFocusable(true);
        cardView.setFocusableInTouchMode(true);
        cardView.setBackgroundColor(mContext.getResources().getColor(R.color.fastlane_background));
        return new ViewHolder(cardView);
    }

    @Override
    public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
        Movie movie = (Movie) item;
        ((ViewHolder) viewHolder).setMovie(movie);

        Log.d(TAG, "onBindViewHolder");
        if (movie.getCardImageUrl() != null) {
            ((ViewHolder) viewHolder).mCardView.setTitleText(movie.getTitle());
            ((ViewHolder) viewHolder).mCardView.setContentText(movie.getStudio());
            ((ViewHolder) viewHolder).mCardView.setMainImageDimensions(CARD_WIDTH, CARD_HEIGHT);
            ((ViewHolder) viewHolder).updateCardViewImage(movie.getCardImageURI());
        }
    }

    @Override
    public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) {
        Log.d(TAG, "onUnbindViewHolder");
    }

    @Override
    public void onViewAttachedToWindow(Presenter.ViewHolder viewHolder) {
        // TO DO
    }

    public static class PicassoImageCardViewTarget implements Target {
        private ImageCardView mImageCardView;

        public PicassoImageCardViewTarget(ImageCardView imageCardView) {
            mImageCardView = imageCardView;
        }

        @Override
        public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom loadedFrom) {
            Drawable bitmapDrawable = new BitmapDrawable(mContext.getResources(), bitmap);
            mImageCardView.setMainImage(bitmapDrawable);
        }

        @Override
        public void onBitmapFailed(Drawable drawable) {
            mImageCardView.setMainImage(drawable);
        }

        @Override
        public void onPrepareLoad(Drawable drawable) {
            // Do nothing, default_background manager has its own transitions
        }
    }
}