万能RecyclerView分割线

import android.content.Context;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.Rect;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.util.TypedValue;import android.view.View;public class DividerItemDecoration extends RecyclerView.ItemDecoration {  /*  * RecyclerView的布局方向，默认先赋值  * 为纵向布局  * RecyclerView 布局可横向，也可纵向  * 横向和纵向对应的分割想画法不一样  * */  private int mOrientation = LinearLayoutManager.VERTICAL;  /**   * item之间分割线的size，1---5   */  private int mSize;  /**   * 绘制item分割线的画笔，和设置其属性   * 来绘制个性分割线   */  private Paint mPaint;  /**   * 构造方法传入布局方向，不可不传   *   * @param context   context   * @param orientation 布局方向   * @param color    颜色   * @param mItemSize  item之间分割线的size   */  public DividerItemDecoration(Context context, int orientation, int color, int mItemSize) {    this.mOrientation = orientation;    /*   item之间分割线的颜色   */    this.mSize= mItemSize;    if (orientation != LinearLayoutManager.VERTICAL && orientation != LinearLayoutManager.HORIZONTAL) {      throw new IllegalArgumentException("LinearLayoutManager error");    }    mSize = (int) TypedValue.applyDimension(mItemSize, TypedValue.COMPLEX_UNIT_DIP, context.getResources().getDisplayMetrics());    mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);    mPaint.setColor(color);     /*设置填充*/    mPaint.setStyle(Paint.Style.FILL);  }  @Override  public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {    if (mOrientation == LinearLayoutManager.VERTICAL) {      drawVertical(c, parent);    } else {      drawHorizontal(c, parent);    }  }  /**   * 绘制纵向 item 分割线   *   * @param canvas canvas   * @param parent parent   */  private void drawVertical(Canvas canvas, RecyclerView parent) {    final int left = parent.getPaddingLeft();    final int right = parent.getMeasuredWidth() - parent.getPaddingRight();    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 top = child.getBottom() + layoutParams.bottomMargin;      final int bottom = top + mSize;      canvas.drawRect(left, top, right, bottom, mPaint);    }  }  /**   * 绘制横向 item 分割线   *   * @param canvas canvas   * @param parent parent   */  private void drawHorizontal(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 + mSize;      canvas.drawRect(left, top, right, bottom, mPaint);    }  }  /**   * 设置item分割线的size   *   * @param outRect outRect   * @param view  view   * @param parent parent   * @param state  state   */  @Override  public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {    if (mOrientation == LinearLayoutManager.VERTICAL) {      outRect.set(0, 0, 0, mSize);    } else {      outRect.set(0, 0, mSize, 0);    }  }}