什么是RecyclerView
RecyclerView是Android 5.0 materials design中的组件之一，相应的还有CardView、Palette等。看名字我们就能看出一点端倪，没错，它主要的特点就是复用。我们知道，Listview中的Adapter中可以实现ViewHolder的复用。RecyclerView提供了一个耦合度更低的方式来复用ViewHolder，并且可以轻松的实现ListView、GridView以及瀑布流的效果。
先给大家展示下效果图：
使用方法：
添加默认分割线：高度为2px，颜色为灰色
mRecyclerView.addItemDecoration(new RecycleViewDivider(mContext, LinearLayoutManager.VERTICAL));
添加自定义分割线：可自定义分割线drawable
mRecyclerView.addItemDecoration(new RecycleViewDivider(mContext, LinearLayoutManager.VERTICAL, R.drawable.divider_mileage));
添加自定义分割线：可自定义分割线高度和颜色
mRecyclerView.addItemDecoration(new RecycleViewDivider(mContext, LinearLayoutManager.VERTICAL, 10, getResources().getColor(R.color.divide_gray_color)));
万能分割线登场：
public class RecycleViewDivider extends RecyclerView.ItemDecoration {private Paint mPaint;private Drawable mDivider;private int mDividerHeight = 2;//分割线高度，默认为1pxprivate int mOrientation;//列表的方向：LinearLayoutManager.VERTICAL或LinearLayoutManager.HORIZONTALprivate 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@Overridepublic 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@Overridepublic 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);}}}}
以上所述是小编给大家介绍的RecyclerView的万能分割线，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
伟人所达到并保持着的高处，并不是一飞就到的，
