RecyclerView需要手动添加分割线，之前每次都是把代码复制粘贴上去了。刚刚练习了一下如何添加竖线分割线和横向间隔线以及双向添加分割线。现在记录一下，但是绘制图片部分需要修改，具体该怎么弄我要找一下资料。先放上普通单色线。
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import static android.graphics.Paint.ANTI_ALIAS_FLAG;
/**
*
* 名称：RecyclerViewItemDecoration
* 作用：RecyclerView分割线
* 描述：
* 作者：pczhu
* 创建时间： 2017/6/14 上午11:49
* 版本：V1.0
* 修改历史：
*
*/
public class RecyclerViewItemDecoration extends RecyclerView.ItemDecoration {
private Context mContext;
/**
*
* 方向参数，默认纵向
* 0x10000000:Vertical纵向
* 0x20000000:Horizontal横向
*
*/
private int mOrientation = 0x10000000;
/**
*
* 横向
*
*/
public static final int Horizontal = 0x10000000;
/**
*
* 纵向
*
*/
public static final int Vertical = 0x20000000;
private Paint mPaint;
/**
*
* 颜色参数：分割线颜色
* 默认颜色：#eeeeee
*
*/
private int mDividerColor = Color.parseColor("#000000");
/**
*
* 分割线高度
* 默认2sp
*
*/
private int mDividerHeight = 2;
/**
*
* 分割线宽度
* 默认2sp
*
*/
private int mDividerWidth = 2;
private static final int[] ATTRS = new int[]{android.R.attr.listDivider};
private Drawable mDivider;
private void setDividerColor(int mDividerColor) {
this.mDividerColor = mDividerColor;
}
private void setDividerHeight(int mDividerHeight) {
this.mDividerHeight = dip2px(mDividerHeight);
}
private void setDividerWidth(int mDividerWidth) {
this.mDividerWidth = dip2px(mDividerWidth);
}
private void setDivider(Drawable mDivider) {
this.mDivider = mDivider;
}
public void setOrientation(int mOrientation) {
this.mOrientation = mOrientation;
}
/**
* 默认分割线：高度为2px，颜色为灰色
*
* @param context
* @param orientation 列表方向
*/
public RecyclerViewItemDecoration(Context context, int orientation) {
this.mContext = context;
if ((orientation & LinearLayoutManager.VERTICAL) == 1
&& (orientation & LinearLayoutManager.HORIZONTAL) == 1) {
throw new IllegalArgumentException("请输入正确的参数！");
}
mOrientation = orientation;
final TypedArray a = context.obtainStyledAttributes(ATTRS);
mDivider = a.getDrawable(0);
a.recycle();
if(mDivider==null){
initPaint();
}
}
/**
* 初始化画笔
*/
private void initPaint() {
mPaint = new Paint(ANTI_ALIAS_FLAG);
mPaint.setColor(mDividerColor);
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
super.onDraw(c, parent, state);
if(getLayoutManagerType(parent) != 2){
if(mOrientation == (Horizontal|Vertical)){
drawDividerBothLine(c,parent);
}else if(mOrientation == Vertical){
drawDividerVertical(c, parent);
}else {
drawDividerHorizontal(c,parent);
}
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
int spanCount = getSpanCount(parent);
//特殊的item间距
if(getLayoutManagerType(parent) == 2){//流 折半 每个偏移一半的值 相邻就会偏移一个
outRect.left = mDividerWidth/2;
outRect.right = mDividerWidth/2;
outRect.bottom = mDividerHeight/2;
outRect.top = mDividerHeight/2;
}else {//其他分割线
if(mOrientation == (Horizontal|Vertical)){
if((parent.getChildAdapterPosition(view)+1)%spanCount == 0){
outRect.set(0,0,0,mDividerHeight);
}else {
outRect.set(0,0,mDividerWidth,mDividerHeight);
}
}else if(mOrientation == Vertical){
outRect.set(0,0,0,mDividerHeight);
}else if(mOrientation == Horizontal){
outRect.set(0,0,mDividerHeight,0);
}
}
}
/**
* 划竖排列表的分割线
* @param c
* @param parent
*/
private void drawDividerVertical(Canvas c,RecyclerView parent){
int leftParent = parent.getPaddingLeft();
int rightParent = parent.getWidth()-parent.getPaddingRight();
int childCount = parent.getChildCount();
for(int i = 0;i < childCount ; i++){
View mChildView = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) mChildView.getLayoutParams();
int left = leftParent+layoutParams.leftMargin;
int right = rightParent-layoutParams.rightMargin;
int top = mChildView.getBottom()+layoutParams.bottomMargin;
if (mDivider != null) {
mDivider.setBounds(left, top, right, top+mDividerHeight);
mDivider.draw(c);
}
if (mPaint != null) {
// Log.i("定点", left + ":" + top + ":" + right + ":" + (top + mDividerHeight));
Rect rect = new Rect(left, top, right, (top + mDividerHeight));
c.drawRect(rect, mPaint);
}
}
}
/**
* 划横排列表间隔线
* @param canvas
* @param parent
*/
private void drawDividerHorizontal(Canvas canvas, RecyclerView parent) {
int top = parent.getPaddingTop();
int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom();
int childSize = parent.getChildCount();
for (int i = 0; i < childSize; i++) {
View mChildView = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) mChildView.getLayoutParams();
int left = mChildView.getRight() + layoutParams.rightMargin;
int right = left + mDividerHeight;
if (mDivider != null) {
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);
}
}
}
/**
* 同时画横向间隔线 竖向分割线
* @param canvas
* @param parent
*/
private void drawDividerBothLine(Canvas canvas, RecyclerView parent) {
int spanCount = getSpanCount(parent);
int childSize = parent.getChildCount();
for (int i = 0; i < childSize; i++) {
View mChildView = parent.getChildAt(i);
RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) mChildView.getLayoutParams();
if((i+1) % spanCount == 0){//划竖向行分界线
int left = parent.getPaddingLeft()+layoutParams.leftMargin;
int right = parent.getMeasuredWidth()-parent.getPaddingRight()-layoutParams.rightMargin;
int top = mChildView.getBottom()+layoutParams.bottomMargin;
int bottom = top+mDividerHeight;
if (mDivider != null) {
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);
}
}else{//划横向item间线
int left = mChildView.getRight() + layoutParams.rightMargin;
int right = left + mDividerWidth;
int top = mChildView.getTop()-layoutParams.topMargin;
int bottom = mChildView.getTop()+mChildView.getMeasuredHeight()+layoutParams.bottomMargin;
if (mDivider != null) {
mDivider.setBounds(left, top, right, bottom);
mDivider.draw(canvas);
}
if (mPaint != null) {
canvas.drawRect(left, top, right, bottom, mPaint);
}
}
}
}
/**
* 获取列数
*
* @param parent
* @return
*/
private int getSpanCount(RecyclerView parent) {
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
int spanCount = -1;
switch (getLayoutManagerType(parent)){
case 1:
spanCount = ((GridLayoutManager) layoutManager).getSpanCount();
break;
case 2:
spanCount = ((StaggeredGridLayoutManager) layoutManager)
.getSpanCount();
break;
}
return spanCount;
}
/**
* 返回manager类型
* @param parent
* @return
*/
private int getLayoutManagerType(RecyclerView parent){
RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();
if (layoutManager instanceof GridLayoutManager) {
return 1;
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
return 2;
} else if (layoutManager instanceof LinearLayoutManager){
return 3;
}else{
return -1;
}
}
public static class Builder{
private Context mContext;
RecyclerViewItemDecoration recyclerViewItemDecoration;
/**
*
* 方向参数，默认纵向
* 0x10000000:Vertical纵向
* 0x20000000:Horizontal横向
*
*/
private int mOrientation = 0x10000000;
/**
*
* 颜色参数：分割线颜色
* 默认颜色：#eeeeee
*
*/
private int mDividerColor = Color.parseColor("#000000");
/**
*
* 分割线高度
* 默认2sp
*
*/
private int mDividerHeight = 2;
/**
*
* 分割线宽度
* 默认2sp
*
*/
private int mDividerWidth = 2;
/**
*
* 作为分割线的图片资源
*
*/
private Drawable mDivider;
public Builder(Context mContext) {
this.mContext = mContext;
recyclerViewItemDecoration = new RecyclerViewItemDecoration(mContext,mOrientation);
}
/**
* 设置方向
* @param mOrientation
* @return
*/
public Builder setOrientation(int mOrientation) {
this.mOrientation = mOrientation;
recyclerViewItemDecoration.setOrientation(mOrientation);
return this;
}
/**
* 设置颜色
* @param mDividerColor
* @return
*/
public Builder setDividerColor(int mDividerColor) {
this.mDividerColor = mDividerColor;
recyclerViewItemDecoration.setDividerColor(mDividerColor);
return this;
}
/**
* 设置纵向分割线高度
* @param mDividerHeight dp单位
* @return
*/
public Builder setDividerHeight(int mDividerHeight) {
this.mDividerHeight = mDividerHeight;
recyclerViewItemDecoration.setDividerHeight(mDividerHeight);
return this;
}
/**
* 设置分割线宽度
* @param mDividerWidth dp单位
* @return
*/
public Builder setDividerWidth(int mDividerWidth) {
this.mDividerWidth = mDividerWidth;
recyclerViewItemDecoration.setDividerWidth(mDividerWidth);
return this;
}
/**
* 设置分割线图片
* @param mDivider
* @return
*/
public Builder setDivider(Drawable mDivider) {
this.mDivider = mDivider;
recyclerViewItemDecoration.setDivider(mDivider);
return this;
}
public RecyclerViewItemDecoration build(){
return recyclerViewItemDecoration;
}
}
public int dip2px(float dpValue) {
if(mContext == null){
return 2;
}
final float scale = mContext.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
/**
* 根据手机的分辨率从 px(像素) 的单位 转成为 dp
*/
public int px2dip(float pxValue) {
final float scale = mContext.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
}
mRecyclerView.addItemDecoration(new RecyclerViewItemDecoration.Builder(this)
.setOrientation(RecyclerViewItemDecoration.Vertical|RecyclerViewItemDecoration.Horizontal)
.setDividerHeight(4)
.setDividerWidth(4)
// .setDivider(getResources().getDrawable(R.mipmap.abc))
.setDividerColor(Color.parseColor("#eebbdd"))
.build());
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