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@@ -0,0 +1,171 @@
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+package com.slient.udiApplication.controls;
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+
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+import android.content.Context;
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+import android.content.res.TypedArray;
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+import android.graphics.Canvas;
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+import android.graphics.Rect;
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+import android.graphics.drawable.Drawable;
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+import android.view.View;
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+
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+import androidx.recyclerview.widget.GridLayoutManager;
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+import androidx.recyclerview.widget.RecyclerView;
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+import androidx.recyclerview.widget.StaggeredGridLayoutManager;
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+
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+public class DividerGridItemDecoration extends RecyclerView.ItemDecoration {
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+
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+ private static final int[] ATTRS = new int[] { android.R.attr.listDivider };
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+ private Drawable mDivider;
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+
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+ public DividerGridItemDecoration(Context context)
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+ {
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+ final TypedArray a = context.obtainStyledAttributes(ATTRS);
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+ mDivider = a.getDrawable(0);
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+ a.recycle();
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+ }
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+
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+ @Override
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+ public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state)
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+ {
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+
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+ drawHorizontal(c, parent);
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+ drawVertical(c, parent);
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+
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+ }
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+
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+ private int getSpanCount(RecyclerView parent)
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+ {
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+ // 列数
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+ int spanCount = -1;
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+ RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
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+ if (layoutManager instanceof GridLayoutManager)
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+ {
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+
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+ spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
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+ } else if (layoutManager instanceof StaggeredGridLayoutManager)
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+ {
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+ spanCount = ((StaggeredGridLayoutManager) layoutManager)
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+ .getSpanCount();
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+ }
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+ return spanCount;
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+ }
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+
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+ public void drawHorizontal(Canvas c, RecyclerView parent)
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+ {
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+ int childCount = parent.getChildCount();
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+ for ( int i = 0; i < childCount; i++)
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+ {
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+ final View child = parent.getChildAt(i);
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+ final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
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+ .getLayoutParams();
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+ final int left = child.getLeft() - params.leftMargin;
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+ final int right = child.getRight() + params.rightMargin
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+ + mDivider.getIntrinsicWidth();
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+ final int top = child.getBottom() + params.bottomMargin;
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+ final int bottom = top + mDivider.getIntrinsicHeight();
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+ mDivider.setBounds(left, top, right, bottom);
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+ mDivider.draw(c);
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+ }
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+ }
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+
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+ public void drawVertical(Canvas c, RecyclerView parent)
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+ {
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+ final int childCount = parent.getChildCount();
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+ for ( int i = 0; i < childCount; i++)
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+ {
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+ final View child = parent.getChildAt(i);
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+
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+ final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child
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+ .getLayoutParams();
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+ final int top = child.getTop() - params.topMargin;
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+ final int bottom = child.getBottom() + params.bottomMargin;
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+ final int left = child.getRight() + params.rightMargin;
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+ final int right = left + mDivider.getIntrinsicWidth();
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+
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+ mDivider.setBounds(left, top, right, bottom);
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+ mDivider.draw(c);
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+ }
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+ }
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+
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+ private boolean isLastColum(RecyclerView parent, int pos, int spanCount,
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+ int childCount)
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+ {
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+ RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
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+ if (layoutManager instanceof GridLayoutManager)
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+ {
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+ if ((pos + 1) % spanCount == 0) // 如果是最后一列，则不需要绘制右边
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+ {
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+ return true;
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+ }
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+ } else if (layoutManager instanceof StaggeredGridLayoutManager)
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+ {
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+ int orientation = ((StaggeredGridLayoutManager) layoutManager)
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+ .getOrientation();
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+ if (orientation == StaggeredGridLayoutManager.VERTICAL )
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+ {
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+ if ((pos + 1) % spanCount == 0) // 如果是最后一列，则不需要绘制右边
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+ {
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+ return true;
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+ }
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+ } else
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+ {
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+ childCount = childCount - childCount % spanCount;
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+ if (pos >= childCount) // 如果是最后一列，则不需要绘制右边
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+ return true;
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+ }
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+ }
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+ return false;
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+ }
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+
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+ private boolean isLastRaw(RecyclerView parent, int pos, int spanCount,
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+ int childCount)
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+ {
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+ RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
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+ if (layoutManager instanceof GridLayoutManager)
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+ {
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+ childCount = childCount - childCount % spanCount;
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+ if (pos >= childCount) // 如果是最后一行，则不需要绘制底部
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+ return true;
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+ } else if (layoutManager instanceof StaggeredGridLayoutManager)
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+ {
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+ int orientation = ((StaggeredGridLayoutManager) layoutManager)
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+ .getOrientation();
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+ // StaggeredGridLayoutManager 且纵向滚动
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+ if (orientation == StaggeredGridLayoutManager.VERTICAL )
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+ {
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+ childCount = childCount - childCount % spanCount;
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+ // 如果是最后一行，则不需要绘制底部
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+ if (pos >= childCount)
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+ return true;
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+ } else
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+ // StaggeredGridLayoutManager 且横向滚动
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+ {
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+ // 如果是最后一行，则不需要绘制底部
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+ if ((pos + 1) % spanCount == 0)
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+ {
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+ return true;
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+ }
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+ }
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+ }
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+ return false;
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+ }
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+
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+ @Override
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+ public void getItemOffsets(Rect outRect, int itemPosition,
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+ RecyclerView parent)
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+ {
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+ int spanCount = getSpanCount(parent);
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+ int childCount = parent.getAdapter().getItemCount();
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+ if (isLastRaw(parent, itemPosition, spanCount, childCount))// 如果是最后一行，则不需要绘制底部
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+ {
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+ outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);
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+ } else if (isLastColum(parent, itemPosition, spanCount, childCount))// 如果是最后一列，则不需要绘制右边
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+ {
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+ outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());
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+ } else
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+ {
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+ outRect.set(0, 0, mDivider.getIntrinsicWidth(),
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+ mDivider.getIntrinsicHeight());
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+ }
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+ }
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+}
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+
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xsjgod