注：本文基于 Android RecyclerView 使用完全解析 體驗(yàn)藝術(shù)般的控件 中關(guān)于GridView網(wǎng)格分割線部分代碼擴(kuò)展而來。

原接口代碼：

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.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.RecyclerView.LayoutManager; import android.support.v7.widget.RecyclerView.State; import android.support.v7.widget.StaggeredGridLayoutManager; import android.view.View;public class DividerGridItemDecoration extends RecyclerView.ItemDecoration {private static final int[] ATTRS = new int[]{android.R.attr.listDivider};private Drawable mDivider;public DividerGridItemDecoration(Context context) {final TypedArray a = context.obtainStyledAttributes(ATTRS);mDivider = a.getDrawable(0);a.recycle();}@Overridepublic void onDraw(Canvas c, RecyclerView parent, State state) {drawHorizontal(c, parent);drawVertical(c, parent);}private int getSpanCount(RecyclerView parent) {// 列數(shù)int spanCount = -1;LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {spanCount = ((GridLayoutManager) layoutManager).getSpanCount();} else if (layoutManager instanceof StaggeredGridLayoutManager) {spanCount = ((StaggeredGridLayoutManager) layoutManager).getSpanCount();}return spanCount;}public void drawHorizontal(Canvas c, RecyclerView parent) {int childCount = parent.getChildCount();for (int i = 0; i < childCount; i++) {final View child = parent.getChildAt(i);final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();final int left = child.getLeft() - params.leftMargin;final int right = child.getRight() + params.rightMargin + mDivider.getIntrinsicWidth();final int top = child.getBottom() + params.bottomMargin;final int bottom = top + mDivider.getIntrinsicHeight();mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}public void drawVertical(Canvas c, RecyclerView parent) {final int childCount = parent.getChildCount();for (int i = 0; i < childCount; i++) {final View child = parent.getChildAt(i);final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();final int top = child.getTop() - params.topMargin;final int bottom = child.getBottom() + params.bottomMargin;final int left = child.getRight() + params.rightMargin;final int right = left + mDivider.getIntrinsicWidth();mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}private boolean isLastColum(RecyclerView parent, int pos, int spanCount, int childCount) {LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {// 如果是最后一列，則不需要繪制右邊if ((pos + 1) % spanCount == 0) {return true;}} else if (layoutManager instanceof StaggeredGridLayoutManager) {int orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();if (orientation == StaggeredGridLayoutManager.VERTICAL) {// 如果是最后一列，則不需要繪制右邊if ((pos + 1) % spanCount == 0) {return true;}} else {childCount = childCount - childCount % spanCount;if (pos >= childCount)// 如果是最后一列，則不需要繪制右邊return true;}}return false;}private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {childCount = childCount - childCount % spanCount;if (pos >= childCount)// 如果是最后一行，則不需要繪制底部return true;} else if (layoutManager instanceof StaggeredGridLayoutManager) {int orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();// StaggeredGridLayoutManager 且縱向滾動if (orientation == StaggeredGridLayoutManager.VERTICAL) {childCount = childCount - childCount % spanCount;// 如果是最后一行，則不需要繪制底部if (pos >= childCount)return true;} else {// 如果是最后一行，則不需要繪制底部if ((pos + 1) % spanCount == 0) {return true;}}}return false;}@Overridepublic void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {int spanCount = getSpanCount(parent);int childCount = parent.getAdapter().getItemCount();// 如果是最后一行，則不需要繪制底部if (isLastRaw(parent, itemPosition, spanCount, childCount)) {outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);} else if (isLastColum(parent, itemPosition, spanCount, childCount)) {// 如果是最后一列，則不需要繪制右邊outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());} else {outRect.set(0, 0, mDivider.getIntrinsicWidth(),mDivider.getIntrinsicHeight());}} }

擴(kuò)展后的代碼：

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.GridLayoutManager; import android.support.v7.widget.RecyclerView; import android.support.v7.widget.RecyclerView.LayoutManager; import android.support.v7.widget.RecyclerView.State; import android.support.v7.widget.StaggeredGridLayoutManager; import android.view.View;public class DividerGridItemDecoration extends RecyclerView.ItemDecoration {private static final int[] ATTRS = new int[]{android.R.attr.listDivider};private Drawable mDivider;private Paint mColorPaint;private int mDividerHeight = 1;public DividerGridItemDecoration(Context context) {final TypedArray a = context.obtainStyledAttributes(ATTRS);mDivider = a.getDrawable(0);a.recycle();}public DividerGridItemDecoration(Context context, int color, int height) {this(context);mColorPaint = new Paint();mColorPaint.setColor(color);mDividerHeight = height;}@Overridepublic void onDraw(Canvas c, RecyclerView parent, State state) {drawHorizontal(c, parent);drawVertical(c, parent);}private int getSpanCount(RecyclerView parent) {// 列數(shù)int spanCount = -1;LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {spanCount = ((GridLayoutManager) layoutManager).getSpanCount();} else if (layoutManager instanceof StaggeredGridLayoutManager) {spanCount = ((StaggeredGridLayoutManager) layoutManager).getSpanCount();}return spanCount;}public void drawHorizontal(Canvas c, RecyclerView parent) {int childCount = parent.getChildCount();int spanCount = getSpanCount(parent);int count = 0;if (childCount % spanCount != 0) {count = childCount;} else {count = childCount - spanCount;}for (int i = 0; i < count; i++) {final View child = parent.getChildAt(i);final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();final int left = child.getLeft() - params.leftMargin;final int right = child.getRight() + params.rightMargin + mDivider.getIntrinsicWidth();final int top = child.getBottom() + params.bottomMargin;final int bottom = top + mDivider.getIntrinsicHeight();if (mColorPaint != null) {c.drawRect(left, top, right, top + mDividerHeight, mColorPaint);} else {mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}}public void drawVertical(Canvas c, RecyclerView parent) {final int childCount = parent.getChildCount();for (int i = 0; i < childCount; i++) {final View child = parent.getChildAt(i);final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();final int top = child.getTop() - params.topMargin;final int bottom = child.getBottom() + params.bottomMargin;final int left = child.getRight() + params.rightMargin;final int right = left + mDivider.getIntrinsicWidth();if (mColorPaint != null) {c.drawRect(left, top, left + mDividerHeight, bottom, mColorPaint);} else {mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}}private boolean isLastColum(RecyclerView parent, int pos, int spanCount, int childCount) {LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {// 如果是最后一列，則不需要繪制右邊if ((pos + 1) % spanCount == 0) {return true;}} else if (layoutManager instanceof StaggeredGridLayoutManager) {int orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();if (orientation == StaggeredGridLayoutManager.VERTICAL) {// 如果是最后一列，則不需要繪制右邊if ((pos + 1) % spanCount == 0) {return true;}} else {childCount = childCount - childCount % spanCount;if (pos >= childCount)// 如果是最后一列，則不需要繪制右邊return true;}}return false;}private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {childCount = childCount - childCount % spanCount;if (pos >= childCount)// 如果是最后一行，則不需要繪制底部return true;} else if (layoutManager instanceof StaggeredGridLayoutManager) {int orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();// StaggeredGridLayoutManager 且縱向滾動if (orientation == StaggeredGridLayoutManager.VERTICAL) {childCount = childCount - childCount % spanCount;// 如果是最后一行，則不需要繪制底部if (pos >= childCount)return true;} else {// 如果是最后一行，則不需要繪制底部if ((pos + 1) % spanCount == 0) {return true;}}}return false;}@Overridepublic void getItemOffsets(Rect outRect, int itemPosition, RecyclerView parent) {int spanCount = getSpanCount(parent);int childCount = parent.getAdapter().getItemCount();// 如果是最后一行，則不需要繪制底部if (isLastRaw(parent, itemPosition, spanCount, childCount)) {outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);} else if (isLastColum(parent, itemPosition, spanCount, childCount)) {// 如果是最后一列，則不需要繪制右邊outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());} else {outRect.set(0, 0, mDivider.getIntrinsicWidth(), mDivider.getIntrinsicHeight());}} }

擴(kuò)展的內(nèi)容：

• 最后一行不畫分割線。通常我們的需求是邊框都不進(jìn)行分割的繪制，而原來的代碼沒有做這部分的處理。（原接口只處理了最后一列的情況）
• 支持分割線的顏色和寬度繪制的定制化。（原接口只支持系統(tǒng)屬性分割線的繪制）。繪制方式：DividerGridItemDecoration(Context context, int color, int height) 通過傳遞color和height進(jìn)行繪制定制化。

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