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RecyclerView不像ListView那样自带分割线，需要自定义分割线

先在drawable中创建一个line_divider.xml文件用户设置分割线的颜色

自定义RecyclerView.ItemDecoration类的子类SimpleDividerItemDecoration类，代码如下：

public class SimpleDividerItemDecoration extends RecyclerView.ItemDecoration {    private Drawable mDivider;     //分割线Drawable    private int mDividerHeight;  //分割线高度    private int inset;       //分割线缩进值    /**     * 使用line_divider中定义好的颜色     *     * @param context     * @param dividerHeight 分割线高度     */    public SimpleDividerItemDecoration(Context context, int dividerHeight) {        mDivider = ContextCompat.getDrawable(context, R.drawable.line_divider);        mDividerHeight = dividerHeight;    }    public SimpleDividerItemDecoration(Context context, int inset, int dividerHeight) {        this.inset = inset;        mDivider = ContextCompat.getDrawable(context, R.drawable.line_divider);        mDividerHeight = dividerHeight;    }    /**     * @param context     * @param divider       分割线Drawable     * @param dividerHeight 分割线高度     */    public SimpleDividerItemDecoration(Context context, Drawable divider, int dividerHeight) {        if (divider == null) {            mDivider = ContextCompat.getDrawable(context, R.drawable.line_divider);        } else {            mDivider = divider;        }        mDividerHeight = dividerHeight;    }    //获取分割线尺寸    @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);    }    @Override    public void onDrawOver(Canvas c, RecyclerView parent, RecyclerView.State state) {        int left = parent.getPaddingLeft();        int right = parent.getWidth() - parent.getPaddingRight();        int childCount = parent.getChildCount();        //最后一个item不画分割线        for (int i = 0; i < childCount - 1; i++) {            View child = parent.getChildAt(i);            RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();            int top = child.getBottom() + params.bottomMargin;//            int bottom = top + mDividerHeight;            int bottom = top + mDivider.getIntrinsicHeight();            if (inset > 0) {                mDivider.setBounds(left + inset, top, right - inset, bottom);            } else {                mDivider.setBounds(left, top, right, bottom);            }            mDivider.draw(c);        }    }}

使用：

recyclerView.addItemDecoration(new SimpleDividerItemDecoration(this,20, 5));