| /* |
| * Copyright 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.example.android.supportv7.widget.selection.fancy; |
| |
| import static androidx.core.util.Preconditions.checkArgument; |
| |
| import android.content.Context; |
| import android.net.Uri; |
| import android.view.LayoutInflater; |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.widget.LinearLayout; |
| |
| import androidx.recyclerview.selection.ItemKeyProvider; |
| import androidx.recyclerview.selection.SelectionTracker; |
| import androidx.recyclerview.widget.RecyclerView; |
| |
| import com.example.android.supportv7.Cheeses; |
| import com.example.android.supportv7.R; |
| |
| final class FancySelectionDemoAdapter extends RecyclerView.Adapter<FancyHolder> { |
| |
| private final ContentUriKeyProvider mKeyProvider; |
| private final Context mContext; |
| |
| // This should be replaced at "bind" time with a real test that |
| // asks SelectionTracker. |
| private SelectionTest mSelTest; |
| |
| FancySelectionDemoAdapter(Context context) { |
| mContext = context; |
| mKeyProvider = new ContentUriKeyProvider("cheeses", Cheeses.sCheeseStrings); |
| mSelTest = new SelectionTest() { |
| @Override |
| public boolean isSelected(Uri id) { |
| throw new IllegalStateException( |
| "Adapter must be initialized with SelectionTracker."); |
| } |
| }; |
| |
| // In the fancy edition of selection support we supply access to stable |
| // ids using content URI. Since we can map between position and selection key |
| // at will we get fancy dependent functionality like band selection and range support. |
| setHasStableIds(false); |
| } |
| |
| ItemKeyProvider<Uri> getItemKeyProvider() { |
| return mKeyProvider; |
| } |
| |
| // Glue together SelectionTracker and the adapter. |
| public void bindSelectionHelper(final SelectionTracker<Uri> selectionTracker) { |
| checkArgument(selectionTracker != null); |
| mSelTest = new SelectionTest() { |
| @Override |
| public boolean isSelected(Uri id) { |
| return selectionTracker.isSelected(id); |
| } |
| }; |
| } |
| |
| void loadData() { |
| onDataReady(); |
| } |
| |
| private void onDataReady() { |
| notifyDataSetChanged(); |
| } |
| |
| @Override |
| public int getItemCount() { |
| return Cheeses.sCheeseStrings.length; |
| } |
| |
| @Override |
| public long getItemId(int position) { |
| return position; |
| } |
| |
| @Override |
| public void onBindViewHolder(FancyHolder holder, int position) { |
| Uri uri = mKeyProvider.getKey(position); |
| holder.update(uri, uri.getLastPathSegment(), mSelTest.isSelected(uri)); |
| } |
| |
| @Override |
| public FancyHolder onCreateViewHolder(ViewGroup parent, int viewType) { |
| LinearLayout layout = inflateLayout(mContext, parent, R.layout.selection_demo_list_item); |
| return new FancyHolder(layout); |
| } |
| |
| @SuppressWarnings("TypeParameterUnusedInFormals") // Convenience to avoid clumsy cast. |
| private static <V extends View> V inflateLayout( |
| Context context, ViewGroup parent, int layout) { |
| |
| return (V) LayoutInflater.from(context).inflate(layout, parent, false); |
| } |
| |
| private interface SelectionTest { |
| boolean isSelected(Uri id); |
| } |
| } |
