打造RecycleView 通用适配器

1.创建RVIewHolder类

import android.content.Context;
import android.graphics.Bitmap;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

public class RViewHolder extends ViewHolder {

    private Context mContext;
    private View mConvertView;
    private SparseArray mViews;

    public RViewHolder(View itemView) {
        super(itemView);
        mConvertView = itemView;
        this.mViews = new SparseArray();
    }

    public static RViewHolder get(Context context, ViewGroup parent, int layoutId, int position) {
        View view = LayoutInflater.from(context).inflate(layoutId, parent, false);
        return new RViewHolder(view);
    }

    /**
     * 通过控件的Id获取对于的控件，如果没有则加入views
     * @param viewId
     * @return
     */
    public <T extends View> T getView(int viewId) {

        View view = mViews.get(viewId);
        if (view == null) {
            view = mConvertView.findViewById(viewId);
            mViews.put(viewId, view);
        }
        return (T) view;
    }

    /**
     * 为TextView设置字符�?
     * @param viewId
     * @param text
     * @return
     */
    public ViewHolder setText(int viewId, String text) {
        TextView view = getView(viewId);
        view.setText(text);
        return this;
    }

    /**
     * 为ImageView设置图片
     * @param viewId
     * @param drawableId
     * @return
     */
    public ViewHolder setImageResource(int viewId, int drawableId) {
        ImageView view = getView(viewId);
        view.setImageResource(drawableId);

        return this;
    }

    /**
     * 为ImageView设置图片
     * @param viewId
     * @return
     */
    public ViewHolder setImageBitmap(int viewId, Bitmap bm) {
        ImageView view = getView(viewId);
        view.setImageBitmap(bm);
        return this;
    }

    public View getConvertView() {
        return mConvertView;
    }
}

2.创建公共适配器Adapter

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

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

public abstract class RVCommonAdapter<T> extends Adapter {
    private Context mContext;
    private List<T> list;
    protected LayoutInflater mInflater;
    private int mItemLayoutId;

    private static final int TYPE_ITEM = 0;
    private static final int TYPE_FOOTER = 1;

    public static final int PULL_TO_LOAD_MORE = 0;
    public static final int LOADING = 1;
    public static final int NO_MORE = 2;
    private int mFooterStatus = PULL_TO_LOAD_MORE;

    public RVCommonAdapter(Context context, List<T> list, int itemLayoutId) {
        this.mContext = context;
        this.mInflater = LayoutInflater.from(mContext);
        this.mItemLayoutId = itemLayoutId;
        this.list = list;

    }

    public interface OnItemClickListener {
        void onItemClick(View view, int position);
    }

    private OnItemClickListener onItemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

    public void setitemLayoutId(int itemLayoutId) {
        this.mItemLayoutId = itemLayoutId;
    }

    public List<T> getList() {
        return this.list;
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    @Override
    public int getItemViewType(int position) {
        if (position + 1 == getItemCount()) {
            return TYPE_FOOTER;
        } else {
            return TYPE_ITEM;
        }
    }

    @Override
    public void onBindViewHolder(final RViewHolder holder, int position) {
        if (holder instanceof FootViewHolder) {
            bindFooter((FootViewHolder) holder);
        } else
            convert(holder, (T) list.get(position));
        if (onItemClickListener != null) {
            holder.itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int position = holder.getLayoutPosition();
                    onItemClickListener.onItemClick(holder.itemView, position);
                }
            });
        }
    }

    protected void bindFooter(FootViewHolder holder) {
        switch (mFooterStatus){
            case PULL_TO_LOAD_MORE:
                holder.progressBar.setVisibility(View.VISIBLE);
                holder.tvLoad.setText( "上拉加载更多...");
                break;
            case LOADING:
                holder.progressBar.setVisibility(View.VISIBLE);
                holder.tvLoad.setText( "正在拼命加载...");
                break;
            case NO_MORE:
                holder.tvLoad.setText("没有更多了！");
                holder.progressBar.setVisibility(View.INVISIBLE);
                break;
        }
    }

    public void setFooterStatus(int status){
        mFooterStatus=status;
        notifyDataSetChanged();
    }

    public int getFooterStatus(){
        return mFooterStatus;
    }

    @Override
    public RViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

        if (viewType == TYPE_ITEM) {
            return RViewHolder.get(mContext, parent, mItemLayoutId, viewType);
        } else if (viewType == TYPE_FOOTER) {
            return new FootViewHolder(LayoutInflater.from(mContext).inflate(R.layout.item_foot, parent,
                    false));
        }else{
            return new RViewHolder(headerView);
        }
    }

    static class FootViewHolder extends RViewHolder {

        TextView tvLoad;
        ProgressBar progressBar;

        public FootViewHolder(View view) {
            super(view);
            tvLoad = (TextView)view.findViewById(R.id.tv_load);
            progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
        }
    }

    //这里定义抽象方法，我们在匿名内部类实现的时候实现此方法来调用控件
    public abstract void convert(RViewHolder holder, T item);
}

3.在Activity中的具体使用

private void setView() {
    layoutManager = new LinearLayoutManager(this);
    billRecycleView.setLayoutManager(layoutManager);
    //为RecycleView添加divider
    billRecycleView.addItemDecoration(new RecycleViewDivider(
            BillActivity.this, LinearLayoutManager.VERTICAL,1,getResources().getColor(R.color.lineColor2)));

    mAdapter = new RVCommonAdapter(this, mData, R.layout.accumulate_income_layout_item) {
        @Override
        public void convert(RViewHolder holder, BillRecordResEntity.ResultBean item) {
           //为item填充数局
        }
    };
    billRecycleView.setAdapter(mAdapter);

    setListener();

}

private void setListener(){
    //下拉刷新监听回调
    billSwiperefreshlayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
        //下拉刷新回调
        }
    });

    //RecyclerView滑动监听
    billRecycleView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);
            if (newState == RecyclerView.SCROLL_STATE_IDLE
                    && lastVisibleItemPosition + 1 == mAdapter.getItemCount()
                    && mAdapter.getFooterStatus() != mAdapter.NO_MORE) {
                //上拉加载更多回调
            }
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
        }
    });

    mAdapter.setOnItemClickListener(new RVCommonAdapter.OnItemClickListener() {
        @Override
        public void onItemClick(View view, int position) {
        //item click回调
        }
    });
}

4、RecycleViewDivider

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;


public class RecycleViewDivider extends RecyclerView.ItemDecoration {

    private Paint mPaint;
    private Drawable mDivider;
    private int mDividerHeight = 2;//分割线高度，默认为1px
    private int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTAL
    private static final int[] ATTRS = new int[]{android.R.attr.listDivider};

    /**
     * 默认分割线：高度为2px，颜色为灰色
     *
     * @param context
     * @param orientation 列表方向
     */
    public RecycleViewDivider(Context context, int orientation) {
        if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) {
            throw new IllegalArgumentException("请输入正确的参数！");
        }
        mOrientation = orientation;

        final TypedArray a = context.obtainStyledAttributes(ATTRS);
        mDivider = a.getDrawable(0);
        a.recycle();
    }

    /**
     * 自定义分割线
     *
     * @param context
     * @param orientation 列表方向
     * @param drawableId  分割线图片
     */
    public RecycleViewDivider(Context context, int orientation, int drawableId) {
        this(context, orientation);
        mDivider = ContextCompat.getDrawable(context, drawableId);
        mDividerHeight = mDivider.getIntrinsicHeight();
    }

    /**
     * 自定义分割线
     *
     * @param context
     * @param orientation   列表方向
     * @param dividerHeight 分割线高度
     * @param dividerColor  分割线颜色
     */
    public RecycleViewDivider(Context context, int orientation, int dividerHeight, int dividerColor) {
        this(context, orientation);
        mDividerHeight = dividerHeight;
        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mPaint.setColor(dividerColor);
        mPaint.setStyle(Paint.Style.FILL);
    }


    //获取分割线尺寸
    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        super.getItemOffsets(outRect, view, parent, state);
        outRect.set(0, 0, 0, mDividerHeight);
    }

    //绘制分割线
    @Override
    public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
        super.onDraw(c, parent, state);
        if (mOrientation == LinearLayoutManager.VERTICAL) {
            drawVertical(c, parent);
        } else {
            drawHorizontal(c, parent);
        }
    }

    //绘制横向 item 分割线
    private void drawHorizontal(Canvas canvas, RecyclerView parent) {
        final int left = parent.getPaddingLeft();
        final int right = parent.getMeasuredWidth() - parent.getPaddingRight();
        final int childSize = parent.getChildCount();
        for (int i = 0; i < childSize; i++) {
            final View child = parent.getChildAt(i);
            RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int top = child.getBottom() + layoutParams.bottomMargin;
            final int bottom = top + mDividerHeight;
            if (mDivider != null) {
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(canvas);
            }
            if (mPaint != null) {
                canvas.drawRect(left, top, right, bottom, mPaint);
            }
        }
    }

    //绘制纵向 item 分割线
    private void drawVertical(Canvas canvas, RecyclerView parent) {
        final int top = parent.getPaddingTop();
        final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();
        final int childSize = parent.getChildCount();
        for (int i = 0; i < childSize; i++) {
            final View child = parent.getChildAt(i);
            RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams();
            final int left = child.getRight() + layoutParams.rightMargin;
            final int right = left + mDividerHeight;
            if (mDivider != null) {
                mDivider.setBounds(left, top, right, bottom);
                mDivider.draw(canvas);
            }
            if (mPaint != null) {
                canvas.drawRect(left, top, right, bottom, mPaint);
            }
        }
    }
}