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CustomAdapter.java

/*
 * Copyright 2016, 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.testing.espresso.RecyclerViewSample;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import java.util.List;

/**
 * Provides views to {@link RecyclerView} with data from a data set.
 */
public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.ViewHolder> {

private final List<String> mDataSet;

private final Context mContext;

/**
     * Provide a reference to the type of views that you are using
     * (custom {@link RecyclerView.ViewHolder}).
     */
    static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView textView;

// We'll use this field to showcase matching the holder from the test.
        private boolean mIsInTheMiddle = false;

ViewHolder(View v) {
            super(v);
            textView = (TextView) v.findViewById(R.id.textView);
        }

TextView getTextView() {
            return textView;
        }

boolean getIsInTheMiddle() {
            return mIsInTheMiddle;
        }

void setIsInTheMiddle(boolean isInTheMiddle) {
            mIsInTheMiddle = isInTheMiddle;
        }
    }

/**
     * Initialize the dataset of the Adapter.
     *
     * @param dataSet String[] containing the data to populate views to be used by RecyclerView.
     */
    CustomAdapter(List<String> dataSet, Context context) {
        mDataSet = dataSet;
        mContext = context;
    }

@Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        // Create a new view.
        View v = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.text_row_item, viewGroup, false);

return new ViewHolder(v);
    }

@Override
    public void onBindViewHolder(ViewHolder viewHolder, final int position) {
        if (position == mDataSet.size() / 2 /* calculate middle element position */) {
            viewHolder.setIsInTheMiddle(true);
            viewHolder.getTextView().setText(mContext.getResources().getString(R.string.middle));
        } else {
            viewHolder.setIsInTheMiddle(false);
            viewHolder.getTextView().setText(mDataSet.get(position));
        }
    }

// Return the size of your data set (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return mDataSet.size();
    }
}