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這篇文章主要介紹了怎么在Android中自定義上下左右間隔線的相關(guān)知識,內(nèi)容詳細(xì)易懂,操作簡單快捷,具有一定借鑒價值,相信大家閱讀完這篇怎么在Android中自定義上下左右間隔線文章都會有所收獲,下面我們一起來看看吧。
代碼如下:
public class SpaceItemDecoration extends RecyclerView.ItemDecoration { private int space; Paint mPaint; public SpaceItemDecoration(int space) { this.space = space; mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setColor(0xffededed); mPaint.setStyle(Paint.Style.FILL); } private static final int HORIZONTAL = 355; @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { int itemViewType = parent.getLayoutManager().getItemViewType(view); if (itemViewType == HORIZONTAL) { //根據(jù)ViewType類型來判斷是否展示線 outRect.bottom = space; if (parent.getChildLayoutPosition(view) % 2 == 0) { outRect.right = space / 2; outRect.left = space; } else { outRect.right = space; outRect.left = space / 2; } } } @Override public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { c.save(); if (parent.getLayoutManager() instanceof GridLayoutManager) { if ((((GridLayoutManager) parent.getLayoutManager())).getSpanCount() == 2) { draw(c, parent); } } c.restore(); } //繪制橫向 item 分割線 private void draw(Canvas canvas, RecyclerView parent) { int childSize = parent.getChildCount(); for (int i = 0; i < childSize; i++) { View child = parent.getChildAt(i); RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams(); int left = child.getLeft(); int right = child.getRight(); int top = child.getBottom() + layoutParams.bottomMargin; int bottom = top + space; if (mPaint != null) { canvas.drawRect(left, top, right, bottom, mPaint);//繪制圖片下放的水平線 } if (parent.getChildLayoutPosition(child) % 2 == 0) { canvas.drawRect(0, child.getTop(), left, child.getBottom() + space, mPaint);//繪制左邊圖片的左間線 } top = child.getTop(); bottom = child.getBottom() + space; left = child.getRight() + layoutParams.rightMargin; right = left + space; if (mPaint != null) { canvas.drawRect(left, top, right, bottom, mPaint);//繪制圖片的右間線 } } } }
使用方法下:
private void initSpaceLine() { if (decor == null) { decor = new SpaceItemDecoration(ViewUtil.dp2px(5)); recycleListView.addItemDecoration(decor); } }
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