RecycleView设置item上下间距

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使用方式：

RecyclerView rvParentCategory = (RecyclerView) view.findViewById(R.id.rv_parent_category);        rvParentCategory.addItemDecoration(new SpaceItemDecoration(DensityUtils.dp2px(getActivity(),20)));

自定义间距类：

package com.onetoo.www.onetoo.config;import android.graphics.Rect;import android.support.v7.widget.RecyclerView;import android.view.View;/** * Created by longShun on 2017/2/7. * desc */public class SpaceItemDecoration extends RecyclerView.ItemDecoration {    private int space;    public SpaceItemDecoration(int space) {        this.space = space;    }    @Override    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {        if(parent.getChildPosition(view) != -1)            outRect.top = space;    }}

工具类

package com.onetoo.www.onetoo.utils;import android.content.Context;import android.util.TypedValue;/** * Created by longShun on 2016/10/20. * */public class DensityUtils {    private DensityUtils() {    }    /**     * dp转px     */    public static int dp2px(Context context, float dpVal) {        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,                dpVal, context.getResources().getDisplayMetrics());    }    /**     * sp转px     */    public static int sp2px(Context context, float spVal) {        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP,                spVal, context.getResources().getDisplayMetrics());    }    /**     * px转dp     */    public static float px2dp(Context context, float pxVal) {        final float scale = context.getResources().getDisplayMetrics().density;        return (pxVal / scale);    }    /**     * px转sp     */    public static float px2sp(Context context, float pxVal) {        return (pxVal / context.getResources().getDisplayMetrics().scaledDensity);    }}

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