RecyclerView 九宫格分割线

package com.jtv.toolmg.util; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.support.v7.widget.RecyclerView; import android.view.View; /** * RecyclerView 九宫格分割线 * * @author 更生 */ public class NineDividerItemDecoration extends RecyclerView.ItemDecoration { private static final int[] ATTRS = new int[]{android.R.attr.listDivider}; private int spanColumnpan; private Drawable mDivider; // spanColumn 是 几列 public NineDividerItemDecoration(Context context, int spanColumn) { final TypedArray a = context.obtainStyledAttributes(ATTRS); mDivider = a.getDrawable(0); a.recycle(); this.spanColumnpan = spanColumn; } @Override public void onDraw(Canvas c, RecyclerView parent) { drawHorizontal(c, parent); drawVertical(c, parent); } // listview 平行线 public void drawVertical(Canvas c, RecyclerView parent) { int left = parent.getPaddingLeft(); int right = parent.getWidth() - parent.getPaddingRight(); int childCount = parent.getChildCount(); int top = 0; for (int i = 0; i < childCount; i += spanColumnpan) { View child = parent.getChildAt(i); RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams(); top = child.getBottom() + params.bottomMargin; int bottom = top + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } } // gridview 竖线 public void drawHorizontal(Canvas c, RecyclerView parent) { int top = parent.getPaddingTop(); int childCount = parent.getChildCount(); int left = 0; int bottom = 0; for (int i = 0; i < childCount; i = i + spanColumnpan) { View child = parent.getChildAt(i); RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams(); left = child.getRight() + params.rightMargin; bottom = child.getBottom() + params.bottomMargin; top = child.getTop() + params.topMargin; for (int j = 0; j <= spanColumnpan; j++) { int mLeft = left * j; int right = mLeft + mDivider.getIntrinsicHeight(); mDivider.setBounds(mLeft, top, right, bottom); mDivider.draw(c); } } } // 控件的padding @Override public void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) { } }