RecyclerView 分割线 (1)
package utils; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.support.v4.content.ContextCompat; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.View; public class RecyclerViewDivider extends RecyclerView.ItemDecoration { private Paint mPaint; private Drawable mDivider; // 自定义的drawable private int mDividerHeight = 1;//分割线高度,默认为1px private int mOrientation; //列表的方向:LinearLayoutManager.VERTICAL 或 LinearLayoutManager.HORIZONTAL private static final int[] ATTRS = new int[]{android.R.attr.listDivider}; /** * @param context * @param orientation 列表方向 */ public RecyclerViewDivider(Context context, int orientation) { if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) { 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(); } /** * 自定义分割线 * * @param context * @param orientation 列表方向 * @param drawableId 分割线图片 */ public RecyclerViewDivider(Context context, int orientation, int drawableId) { this(context, orientation); mDivider = ContextCompat.getDrawable(context, drawableId); mDividerHeight = mDivider.getIntrinsicHeight(); } /** * 自定义分割线 * * @param context * @param orientation 列表方向 * @param dividerHeight 分割线高度 * @param dividerColor 分割线颜色 */ public RecyclerViewDivider(Context context, int orientation, int dividerHeight, int dividerColor) { this(context, orientation); mDividerHeight = dividerHeight; mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setColor(dividerColor); mPaint.setStyle(Paint.Style.FILL); } //由于Divider也有长宽高,每一个Item需要向下或者向右偏移 @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { //super.getItemOffsets(outRect, view, parent, state); //outRect.set(0, 0, 0, mDividerHeight); if(mOrientation == LinearLayoutManager.VERTICAL){ //画横线,就是往下偏移一个分割线的高度 outRect.set(0, 0, 0, mDivider.getIntrinsicHeight()); }else { //画竖线,就是往右偏移一个分割线的宽度 outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0); } } //绘制分割线 @Override public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { super.onDraw(c, parent, state); if (mOrientation == LinearLayoutManager.HORIZONTAL) { drawVertical(c, parent); } else { drawHorizontal(c, parent); } } // item 竖向显示,绘制横向 item 分割线 private void drawHorizontal(Canvas canvas, RecyclerView parent) { //获取RecyclerView 的 padding final int left = parent.getPaddingLeft(); final int right = parent.getMeasuredWidth() - parent.getPaddingRight(); //或 //使用 item 的 padding参数 View childView = parent.getChildAt(0); final int childSize = childView..getPaddingLeft(); final int right = childView.getMeasuredWidth() - childView.getPaddingRight(); for (int i = 0; i < childSize; i++) { final View child = parent.getChildAt(i); //获得child的布局信息(主要是获取,LayoutParams中的params.bottomMargin长度 RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams(); final int top = child.getBottom() + layoutParams.bottomMargin; final 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); } } } //绘制纵向 item 分割线 private void drawVertical(Canvas canvas, RecyclerView parent) { final int top = parent.getPaddingTop(); final int bottom = parent.getMeasuredHeight() - parent.getPaddingBottom(); final int childSize = parent.getChildCount(); for (int i = 0; i < childSize; i++) { final View child = parent.getChildAt(i); RecyclerView.LayoutParams layoutParams = (RecyclerView.LayoutParams) child.getLayoutParams(); final int left = child.getRight() + layoutParams.rightMargin; final 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); } } } } //使用系统list分割线 1. mRecyclerView.addItemDecoration(new RecyclerViewDivider(mContext, LinearLayoutManager.VERTICAL)); //使用自定义图片分割线 2. mRecyclerView.addItemDecoration(new RecyclerViewDivider(mContext, LinearLayoutManager.VERTICAL, R.drawable.divider_mileage)); //高度自定义10,设置分割线颜色 3.mRecyclerView.addItemDecoration(new RecyclerViewDivider( mContext, LinearLayoutManager.VERTICAL, 10, ContextCompat.getColor(mContext, R.color.divide_gray_color)));
RecyclerView 分割线(2)
RecyclerView高度定制的“万能分割线” https://blog.csdn.net/u013134391/article/details/64123337
https://github.com/YuJunKui1995/UniversalItemDecoration