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CardPresenter.java
/* * Copyright (C) 2017 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.google.android.tvhomescreenchannels.presenters; import android.content.Context; import android.content.res.Resources; import android.support.media.tv.TvContractCompat; import android.support.v17.leanback.widget.ImageCardView; import android.support.v17.leanback.widget.Presenter; import android.support.v4.content.ContextCompat; import android.view.ViewGroup; import com.bumptech.glide.Glide; import com.google.android.tvhomescreenchannels.Clip; import com.google.android.tvhomescreenchannels.R; /* * A CardPresenter is used to generate Views and bind Objects to them on demand. * It contains an ImageCardView to render each clip within each playlist row. */ public class CardPresenter extends Presenter { private static int sSelectedBackgroundColor; private static int sDefaultBackgroundColor; 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); } ; private static float getWidthMultplier(int aspectRatio) { switch (aspectRatio) { case TvContractCompat.PreviewProgramColumns.ASPECT_RATIO_16_9: return 16.0f / 9.0f; case TvContractCompat.PreviewProgramColumns.ASPECT_RATIO_3_2: return 3.0f / 2.0f; case TvContractCompat.PreviewProgramColumns.ASPECT_RATIO_2_3: return 2.0f / 3.0f; case TvContractCompat.PreviewProgramColumns.ASPECT_RATIO_4_3: return 4.0f / 3.0f; case TvContractCompat.PreviewProgramColumns.ASPECT_RATIO_1_1: default: return 1.0f; } } @Override public ViewHolder onCreateViewHolder(ViewGroup parent) { Context context = parent.getContext(); sDefaultBackgroundColor = ContextCompat.getColor(context, R.color.default_background); sSelectedBackgroundColor = ContextCompat.getColor(context, R.color.selected_background); 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 CardViewHolder(cardView); } @Override public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) { Clip clip = (Clip) item; if (clip.getCardImageUrl() != null) { ImageCardView cardView = (ImageCardView) viewHolder.view; Resources resources = cardView.getContext().getResources(); cardView.setTitleText(clip.getTitle()); cardView.setContentText(clip.getDescription()); float widthMultiplier = getWidthMultplier(clip.getAspectRatio()); int cardWidth = Math.round(resources.getDimensionPixelSize(R.dimen.card_width) * widthMultiplier); int cardHeight = resources.getDimensionPixelSize(R.dimen.card_height); cardView.setMainImageDimensions(cardWidth, cardHeight); Glide.with(viewHolder.view.getContext()) .load(clip.getCardImageUrl()) .into(cardView.getMainImageView()); } } @Override public void onUnbindViewHolder(Presenter.ViewHolder viewHolder) { ImageCardView cardView = (ImageCardView) viewHolder.view; // Remove references to images so that the garbage collector can free up memory cardView.setBadgeImage(null); cardView.setMainImage(null); } public static final class CardViewHolder extends ViewHolder { CardViewHolder(ImageCardView view) { super(view); } } }