可自定义分割线的颜色 宽度 虚线 适用RecyclerView 的 GridLayoutManager LinearLayoutManager 一行代码搞定
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```
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.NonNull;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
/**
* hukui 2019/5/21 8:30
**/
public class RcyclerItemDecoration extends RecyclerView.ItemDecoration {
private int mDividerHeight = 1;//分割线高度，默认为1px
private int mDividerColor = Color.parseColor("#8b8b8b");//分割线颜色
private float dashWidth = 0;//虚线长度
private float dashGap = 0;//虚线间隔长度
private int spanCount;//每列的个数
private int mMaxSpanGroupIndex;
Paint paint;
public RcyclerItemDecoration() {
initDrawable();
}
public RcyclerItemDecoration(int mDividerHeight) {
this.mDividerHeight = mDividerHeight;
initDrawable();
}
public RcyclerItemDecoration(int mDividerHeight, int mDividerColor) {
this.mDividerHeight = mDividerHeight;
this.mDividerColor = mDividerColor;
initDrawable();
}
public RcyclerItemDecoration(int mDividerHeight, int mDividerColor, float dashWidth, float dashGap) {
this.mDividerHeight = mDividerHeight;
this.mDividerColor = mDividerColor;
this.dashWidth = dashWidth;
this.dashGap = dashGap;
initDrawable();
}
private void initDrawable() {
paint = new Paint();
paint.setColor(mDividerColor);
paint.setStrokeWidth(mDividerHeight);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
paint.setPathEffect(new DashPathEffect(new float[]{dashWidth, dashGap}, 0));
}
@Override
public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
//获取当前位置
int position = parent.getChildAdapterPosition(view);
view.setTag(position);
RecyclerView.LayoutManager manager = parent.getLayoutManager();
if (manager instanceof GridLayoutManager) {
GridLayoutManager gridLayoutManager = (GridLayoutManager) parent.getLayoutManager();
GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup();
//获取每列的个数
spanCount = gridLayoutManager.getSpanCount();
//获取最大的列数
mMaxSpanGroupIndex = spanSizeLookup.getSpanGroupIndex(parent.getAdapter().getItemCount() - 1, spanCount);
//获取当前列数
int spanGroupIndex = spanSizeLookup.getSpanGroupIndex(position, spanCount);
//当前列中占用的个数
int spanSize = spanSizeLookup.getSpanSize(position);
if (spanGroupIndex == mMaxSpanGroupIndex && spanGroupIndex != 0) {
if (spanSize < spanCount) {
outRect.right = mDividerHeight;
}
} else {
//view 没有占据一列 并不是当前列的第一个
if (spanSize < spanCount && spanSize != 0) {
outRect.left = mDividerHeight;
}
}
if (spanGroupIndex != 0) {
outRect.top = mDividerHeight;
}
} else if (manager instanceof LinearLayoutManager) {
LinearLayoutManager layoutManager = (LinearLayoutManager) manager;
if (position != 0) {
if (layoutManager.getOrientation() == LinearLayoutManager.HORIZONTAL) {
outRect.left = mDividerHeight;
} else {
outRect.top = mDividerHeight;
}
}
}
}
@Override
public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
super.onDraw(c, parent, state);
RecyclerView.LayoutManager manager = parent.getLayoutManager();
if (manager instanceof GridLayoutManager) {
drawGrid(c, parent);
} else if (manager instanceof LinearLayoutManager) {
LinearLayoutManager layoutManager = (LinearLayoutManager) manager;
if (layoutManager.getOrientation() == LinearLayoutManager.HORIZONTAL) {
draHorizontal(c, parent);
} else {
draVertical(c, parent);
}
}
}
private void drawGrid(Canvas c, RecyclerView parent) {
GridLayoutManager gridLayoutManager = (GridLayoutManager) parent.getLayoutManager();
int count = parent.getChildCount();
GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup();
for (int i= 0; i< count; i++) {
View view = parent.getChildAt(i);
RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) view.getLayoutParams();
int position = (int) view.getTag();
//获取当前列数
int spanGroupIndex = spanSizeLookup.getSpanGroupIndex(position, spanCount);
//当前列中的位置
int spanSize = spanSizeLookup.getSpanIndex(position, spanCount);
int left, top, right, bottom;
if (spanGroupIndex == mMaxSpanGroupIndex && spanGroupIndex != 0) {
if (spanSize < spanCount) {
left= view.getRight();
right= left+ mDividerHeight - params.rightMargin;
top= view.getTop() - params.topMargin;
bottom= view.getBottom() + params.bottomMargin;
c.drawLine(left, top, right, bottom, paint);
}
} else {
//竖线 左边需要分割线，开始绘制
if (spanSize < spanCount && spanSize != 0) {
left= view.getLeft() - mDividerHeight - params.leftMargin;
right= left+ mDividerHeight;
top= view.getTop() - params.topMargin;
bottom= view.getBottom() + params.bottomMargin;
c.drawLine(left, top, right, bottom, paint);
}
}
//画横线 最后一组不需要绘制
if (spanGroupIndex < mMaxSpanGroupIndex) {
left= view.getLeft() + params.leftMargin;
right= left+ view.getMeasuredWidth() + params.rightMargin;
top= view.getBottom() + params.bottomMargin;
bottom= top+ mDividerHeight;
c.drawLine(left, top, right, bottom, paint);
}
}
}
//横向分割线
private void draVertical(Canvas c, RecyclerView parent) {
int count = parent.getChildCount();
int left = parent.getPaddingLeft();
int right = parent.getMeasuredWidth() - parent.getPaddingRight();
for (int i= 0; i< count; i++) {
View view = parent.getChildAt(i);
int position = (int) view.getTag();
if (position == 0) {
continue;
}
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) view.getLayoutParams();
int top = view.getBottom() + layoutParams.bottomMargin;
int bottom = top + mDividerHeight;
c.drawLine(left, top, right, bottom, paint);
}
}
//竖直分割线
private void draHorizontal(Canvas c, RecyclerView parent) {
LinearLayoutManager layoutManager = (LinearLayoutManager) parent.getLayoutManager();
int count = parent.getChildCount();
int top = parent.getPaddingTop();
int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();
for (int i= 0; i< count; i++) {
View view = parent.getChildAt(i);
int position = (int) view.getTag();
if (position == layoutManager.getChildCount() - 1) {
continue;
}
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) view.getLayoutParams();
int left = view.getRight() + layoutParams.rightMargin;
int right = left + mDividerHeight;
c.drawLine(left, top, right, bottom, paint);
}
}
}
```