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

/*
 * Copyright (C) 2015 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.tvleanback.presenter;

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.ViewGroup;

import com.bumptech.glide.Glide;
import com.example.android.tvleanback.R;
import com.example.android.tvleanback.model.Movie;

/*
 * 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 int CARD_WIDTH = 313;
    private static int CARD_HEIGHT = 176;
    private static int sSelectedBackgroundColor;
    private static int sDefaultBackgroundColor;
    private Drawable mDefaultCardImage;

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

        sDefaultBackgroundColor = parent.getResources().getColor(R.color.default_background);
        sSelectedBackgroundColor = parent.getResources().getColor(R.color.selected_background);
        mDefaultCardImage = parent.getResources().getDrawable(R.drawable.movie);

        ImageCardView cardView = new ImageCardView(parent.getContext()) {
            @Override
            public void setSelected(boolean selected) {
                updateCardBackgroundColor(this, selected);
                super.setSelected(selected);
            }
        };

        cardView.setFocusable(true);
        cardView.setFocusableInTouchMode(true);
        updateCardBackgroundColor(cardView, false);
        return new ViewHolder(cardView);
    }

    private static void updateCardBackgroundColor(ImageCardView view, boolean selected) {
        int color = selected ? sSelectedBackgroundColor : sDefaultBackgroundColor;
        // Both background colors should be set because the view's background is temporarily visible
        // during animations.
        view.setBackgroundColor(color);
        view.findViewById(R.id.info_field).setBackgroundColor(color);
    }

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

        Log.d(TAG, "onBindViewHolder");
        if (movie.getCardImageUrl() != null) {
            cardView.setTitleText(movie.getTitle());
            cardView.setContentText(movie.getStudio());
            cardView.setMainImageDimensions(CARD_WIDTH, CARD_HEIGHT);
            Glide.with(viewHolder.view.getContext())
                    .load(movie.getCardImageUrl())
                    .centerCrop()
                    .error(mDefaultCardImage)
                    .into(cardView.getMainImageView());
        }
    }

    @Override
    public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) {
        Log.d(TAG, "onUnbindViewHolder");
        ImageCardView cardView = (ImageCardView) viewHolder.view;
        // Remove references to images so that the garbage collector can free up memory
        cardView.setBadgeImage(null);
        cardView.setMainImage(null);
    }
}