RecyclerView的万能分割线
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); } } } }
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我们网站的支持!
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