BaseAdapter.java

/*
 * The MIT License (MIT)
 * 
 * Copyright (c) 2015 baoyongzhang <baoyz94@gmail.com>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.baoyz.dribble.adapter;

import android.support.v7.widget.RecyclerView;
import android.view.View;

import com.baoyz.dribble.util.DimenUtil;

import butterknife.ButterKnife;

/**
 * Created by baoyz on 15/1/14.
 */
public abstract class BaseAdapter<VH extends BaseAdapter.ViewHolder> extends RecyclerView.Adapter<VH> {

    private int mLastPosition = -1;

    @Override
    public void onBindViewHolder(VH holder, int position) {
        if (position > mLastPosition) {
            mLastPosition = position;
            startItemAnimation(holder, position);
        }
    }

    protected void startItemAnimation(VH holder, int position) {
        holder.mItemView.setTranslationY(DimenUtil.getScreenWidth(holder.mItemView.getContext()) / 2);
        holder.mItemView.setAlpha(0);
        holder.mItemView.animate().translationY(0).alpha(1).setDuration(500).start();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {

        public View mItemView;

        public ViewHolder(View itemView) {
            super(itemView);
            mItemView = itemView;
            ButterKnife.inject(this, itemView);
        }
    }
}