RecyclerView自定义分割线

DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(this, DividerItemDecoration.VERTICAL);
  Drawable drawable = getResources().getDrawable(R.drawable.mycoler);
  dividerItemDecoration.setDrawable(drawable);
  recyclerView.addItemDecoration(dividerItemDecoration);

public MyItemDecoration(Context context, int orientation, int inset, Drawable drawable) {
  if (orientation != VERTICAL && orientation != HORIZONTAL) {
   throw new IllegalArgumentException("请输入正确的参数！");
  }
  this.inset = inset;
  mOrientation = orientation;
  mDivider = drawable;
  if (drawable == null) {
   final TypedArray a = context.obtainStyledAttributes(ATTRS);
   mDivider = a.getDrawable(0);
   a.recycle();
  }
 }

@Override
 public void onDraw(@NonNull Canvas c, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
  if (parent.getLayoutManager() != null && this.mDivider != null) {
   if (this.mOrientation == VERTICAL) {
    this.drawVertical(c, parent);
   } else {
    this.drawHorizontal(c, parent);
   }

  }
 }

private void drawHorizontal(Canvas canvas, RecyclerView parent) {
  int top = parent.getPaddingTop();
  int bottom = parent.getHeight() - parent.getPaddingBottom();

  int childCount = parent.getChildCount();
  for (int i = 0; i  0) {
    mDivider.setBounds(left + inset, top, right - inset, bottom);
   } else {
    mDivider.setBounds(left, top, right, bottom);
   }
   mDivider.draw(canvas);
  }
 }

 @Override
 public void getItemOffsets(@NonNull Rect outRect, @NonNull View view, @NonNull RecyclerView parent, @NonNull RecyclerView.State state) {
  if (this.mDivider == null) {
   outRect.set(0, 0, 0, 0);
  } else {
   if (this.mOrientation == VERTICAL) {
    outRect.set(0, 0, 0, this.mDivider.getIntrinsicHeight());
   } else {
    outRect.set(0, 0, this.mDivider.getIntrinsicWidth(), 0);
   }

  }
 }