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DetailViewPagerAdapter.java
package com.example.android.unsplash.ui.pager; import android.app.Activity; import android.databinding.DataBindingUtil; import android.support.annotation.NonNull; import android.support.v4.view.PagerAdapter; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import com.bumptech.glide.Glide; import com.example.android.unsplash.R; import com.example.android.unsplash.data.model.Photo; import com.example.android.unsplash.databinding.DetailViewBinding; import com.example.android.unsplash.ui.DetailSharedElementEnterCallback; import com.example.android.unsplash.ui.ImageSize; import java.util.List; /** * Adapter for paging detail views. */ public class DetailViewPagerAdapter extends PagerAdapter { private final List
allPhotos; private final LayoutInflater layoutInflater; private final int photoWidth; private final Activity host; private DetailSharedElementEnterCallback sharedElementCallback; public DetailViewPagerAdapter(@NonNull Activity activity, @NonNull List
photos, @NonNull DetailSharedElementEnterCallback callback) { layoutInflater = LayoutInflater.from(activity); allPhotos = photos; photoWidth = activity.getResources().getDisplayMetrics().widthPixels; host = activity; sharedElementCallback = callback; } @Override public int getCount() { return allPhotos.size(); } @Override public Object instantiateItem(ViewGroup container, int position) { DetailViewBinding binding = DataBindingUtil.inflate(layoutInflater, R.layout.detail_view, container, false); binding.setData(allPhotos.get(position)); onViewBound(binding); binding.executePendingBindings(); container.addView(binding.getRoot()); return binding; } private void onViewBound(DetailViewBinding binding) { Glide.with(host) .load(binding.getData().getPhotoUrl(photoWidth)) .placeholder(R.color.placeholder) .override(ImageSize.NORMAL[0], ImageSize.NORMAL[1]) .into(binding.photo); } @Override public void setPrimaryItem(ViewGroup container, int position, Object object) { if (object instanceof DetailViewBinding) { sharedElementCallback.setBinding((DetailViewBinding) object); } } @Override public boolean isViewFromObject(View view, Object object) { return object instanceof DetailViewBinding && view.equals(((DetailViewBinding) object).getRoot()); } @Override public void destroyItem(ViewGroup container, int position, Object object) { container.removeView(((DetailViewBinding) object).getRoot()); } }