新建一个辅助类:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.support.annotation.ColorInt;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
/**
* 自定义分割线
*/
public class CommItemDecorationextends RecyclerView.ItemDecoration {
private static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;
private static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;
private int mSpace =1;//间隔
private RectmRect =new Rect(0,0,0,0);
private PaintmPaint =new Paint();
private int mOrientation;
private CommItemDecoration(Context context,int orientation,@ColorInt int color,int space) {
mOrientation = orientation;
if(space>0){
mSpace = space;
}
mPaint.setColor(color);
}
@Override
public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
super.onDraw(c, parent, state);
if (mOrientation ==VERTICAL_LIST) {
drawVertical(c, parent);
}else {
drawHorizontal(c, parent);
}
}
public void drawVertical(Canvas c, RecyclerView parent) {
final int left = parent.getPaddingLeft();
final int right = parent.getWidth() - parent.getPaddingRight();
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.getBottom() + params.bottomMargin;
final int bottom = top +mSpace;
mRect.set(left,top,right,bottom);
c.drawRect(mRect,mPaint);
}
}
public void drawHorizontal(Canvas c, RecyclerView parent) {
final int top = parent.getPaddingTop();
final int bottom = parent.getHeight() - parent.getPaddingBottom();
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 left = child.getRight() + params.rightMargin;
final int right = left +mSpace;
mRect.set(left, top, right, bottom);
c.drawRect(mRect,mPaint);
}
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
if (mOrientation ==VERTICAL_LIST) {
outRect.set(0,0,0,mSpace);
}else {
outRect.set(0,0,mSpace,0);
}
}
public static CommItemDecoration createVertical(Context context,@ColorInt int color,int height){
return new CommItemDecoration(context,VERTICAL_LIST,color,height);
}
public static CommItemDecoration createHorizontal(Context context,@ColorInt int color,int width){
return new CommItemDecoration(context,HORIZONTAL_LIST,color,width);
}
}
使用方式：
垂直方向：CommItemDecoration vertical = CommItemDecoration.createVertical(context, Color.BLUE,30)
//水平方向：CommItemDecoration.createHorizontal(context, Color.BLUE,30)
RecyclerView.addItemDecoration(vertical);