RecyclerView簡單使用

RecyclerView是谷歌V7包下新增的控件,用來替代ListView的使用，他可以通過設置LayoutManager來快速實現listview、gridview、瀑布流的效果，而且還可以設置橫向和縱向顯示，添加動畫效果也非常簡單(自帶了ItemAnimation，可以設置加載和移除時的動畫，方便做出各種動態瀏覽的效果),也是官方推薦使用的

引用：

compile 'com.android.support:cardview-v7:21.0.3'

compile 'com.android.support:recyclerview-v7:21.0.3'

簡單使用：

mRecyclerView = findView(R.id.id_recyclerview);

//設置佈局管理器

 mRecyclerView.setLayoutManager(new LinearLayoutManager(this));//類listview
//mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));//類gridview
//mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(2, OrientationHelper.VERTICAL));//類瀑布流

//設置adapter

mRecyclerView.setAdapter(adapter)

//點擊事件

需要自定義，有3中方法，目前以在adapter中添加點擊爲例

adapter：

/**
 * Created by hp on 2017/2/7.
 */
public class MyListAdapter extends RecyclerView.Adapter<MyListAdapter.MyRecyclerListHolder> {

    private Context mContext;
    private List<String> mDatas;
    private LayoutInflater inflater;

    public MyListAdapter(Context context, List<String> datas){
        this. mContext=context;
        this. mDatas=datas;
        inflater=LayoutInflater. from(mContext);
    }

//添加一個點擊事件的接口

    public interface OnItemClickLitener{
        void onItemClick(View view, int position);
        void onItemLongClick(View view , int position);
    }
    private OnItemClickLitener mOnItemClickLitener;

    public void setOnItemClickLitener(OnItemClickLitener mOnItemClickLitener)
    {
        this.mOnItemClickLitener = mOnItemClickLitener;
    }



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

        View view = inflater.inflate(R.layout.item_home1, parent, false);

        MyRecyclerListHolder holder= new MyRecyclerListHolder(view);
        return holder;
    }

    @Override
    public void onBindViewHolder(final MyRecyclerListHolder holder, int position) {
        holder.tv.setText(mDatas.get(position));
        holder.bb.setText(mDatas.get(position));
        // 如果設置了回調，則設置點擊事件
        if (mOnItemClickLitener != null)
        {

             //holder.itemView.其中iteamView是系統個提供的，表示對應的iteam一整欄，也就是說點擊事件綁定的是整個iteam欄

             holder.itemView.setOnClickListener(new View.OnClickListener()

             //holder.tv.setOnClickListener這個點擊事件就綁定爲對應的textview控件了

            {
                @Override
                public void onClick(View v)
                {
                    int pos = holder.getPosition();

                    mOnItemClickLitener.onItemClick(holder.itemView, pos);
                }
            });
        }
    }


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

    class MyRecyclerListHolder extends ViewHolder{
        TextView tv;
        Button bb;
        public MyRecyclerListHolder(View itemView) {
            super(itemView);
            tv=(TextView) itemView.findViewById(R.id. id_num);
            bb = (Button) itemView.findViewById(R.id.bb);
        }
    }

}

-----------------------------------------------------------------------------------------------------------------------------------------------------

RecyclerView的分割線：

通過該方法添加分割線： mRecyclerView.addItemDecoration() 

//該分割線是系統默認的，你可以在theme.xml中找到該屬性的使用情況

mRecyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));

添加默認分割線：高度爲2px，顏色爲灰色

mRecyclerView.addItemDecoration(new RecycleViewDivider(mContext, LinearLayoutManager.VERTICAL));

添加自定義分割線：可自定義分割線drawable


mRecyclerView.addItemDecoration(new RecycleViewDivider(
    mContext, LinearLayoutManager.VERTICAL, R.drawable.divider_mileage));

添加自定義分割線：可自定義分割線高度和顏色


mRecyclerView.addItemDecoration(new RecycleViewDivider(
    mContext, LinearLayoutManager.VERTICAL, 10, getResources().getColor(R.color.divide_gray_color)));

萬能分割線登場：
public class RecycleViewDivider extends RecyclerView.ItemDecoration {


    private Paint mPaint;
    private Drawable mDivider;
    private int mDividerHeight = 2;//分割線高度，默認爲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};


    /**
     * 默認分割線：高度爲2px，顏色爲灰色
     *
     * @param context
     * @param orientation 列表方向
     */
    public RecycleViewDivider(Context context, int orientation) {
        if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) {
            throw new IllegalArgumentException("請輸入正確的參數！");
        }
        mOrientation = orientation;


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


    /**
     * 自定義分割線
     *
     * @param context
     * @param orientation 列表方向
     * @param drawableId  分割線圖片
     */
    public RecycleViewDivider(Context context, int orientation, int drawableId) {
        this(context, orientation);
        mDivider = ContextCompat.getDrawable(context, drawableId);
        mDividerHeight = mDivider.getIntrinsicHeight();
    }


    /**
     * 自定義分割線
     *
     * @param context
     * @param orientation   列表方向
     * @param dividerHeight 分割線高度
     * @param dividerColor  分割線顏色
     */
    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);
    }




    //獲取分割線尺寸
    @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);
    }


    //繪製分割線
    @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);
        }
    }


    //繪製橫向 item 分割線
    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);
            }
        }
    }


    //繪製縱向 item 分割線
    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);
            }
        }
    }


附：自定的drawable文件一份
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <size android:height="20dp" />
    <solid android:color="#ff992900" />
</shape>