自定义PopWindow

package com.onetoo.www.onetoo.ui;

import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;

import com.onetoo.www.onetoo.R;
import com.onetoo.www.onetoo.abapter.home.HomeCategoryRecycleAdapter;
import com.onetoo.www.onetoo.config.SpaceItemDecoration;
import com.onetoo.www.onetoo.utils.DensityUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by longShun on 2017/2/6.
 * desc 分类弹出框
 */
public class PopWindowForHomeCategory extends PopupWindow implements HomeCategoryRecycleAdapter.OnItemClickListener{

    private Context mContext;

    private View mPopWindowView;


    public PopWindowForHomeCategory(Context context) {
        super(context);
        this.mContext = context;

        initWindowView();
        initPopWindow();
    }

    private void initPopWindow() {
        //设置的View
        setContentView(mPopWindowView);
        //设置弹出窗体的宽
        setWidth(RelativeLayout.LayoutParams.MATCH_PARENT);
        //设置弹出窗体的高
        setHeight(RelativeLayout.LayoutParams.WRAP_CONTENT);
        //设置弹出窗体可点击
        setFocusable(true);
        //设置弹出窗体动画效果
        setAnimationStyle(R.style.PopWindowFadeInOut);//弹出的效果
        //实例化一个ColorDrawable颜色为半透明
        ColorDrawable dw = new ColorDrawable(0xb0000000);
        //设置弹出窗体的背景
        setBackgroundDrawable(dw);
    }

    private void initWindowView() {
        mPopWindowView = LayoutInflater.from(mContext).inflate(R.layout.home_category, null);

        RecyclerView mRvCategory = (RecyclerView) mPopWindowView.findViewById(R.id.rv_home_category);
        mRvCategory.addItemDecoration(new SpaceItemDecoration(DensityUtils.dp2px(mContext,10)));
        mRvCategory.setLayoutManager(new GridLayoutManager(mContext,3));

        List<String> mListCategory =new ArrayList<>();
        mListCategory.add("餐饮美食");
        mListCategory.add("购物");
        mListCategory.add("生活服务");
        mListCategory.add("丽人");
        mListCategory.add("休闲娱乐");
        mListCategory.add("母婴亲子");

        List<Integer> mListIcon = new ArrayList<>();
        mListIcon.add(R.drawable.home_food);
        mListIcon.add(R.drawable.home_shop);
        mListIcon.add(R.drawable.home_service);
        mListIcon.add(R.drawable.home_beautiful);
        mListIcon.add(R.drawable.home_funny);
        mListIcon.add(R.drawable.home_baby);

        HomeCategoryRecycleAdapter adapter = new HomeCategoryRecycleAdapter(mContext, mListCategory, mListIcon);
        mRvCategory.setAdapter(adapter);

        adapter.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(int position) {
        if (onItemClickListener != null) {
            onItemClickListener.onItemClick(position);
        }
    }

    private HomeCategoryRecycleAdapter.OnItemClickListener onItemClickListener;

    public void setOnItemClickListener(HomeCategoryRecycleAdapter.OnItemClickListener onItemClickListener) {
        this.onItemClickListener = onItemClickListener;
    }

}

动画效果代码：
values-styles.xml

<!--首页分类弹出框透明渐变-->
    <style name="PopWindowFadeInOut">
        <item name="android:windowEnterAnimation">@anim/anim_fade_in</item>
        <item name="android:windowExitAnimation">@anim/anim_fade_out</item>
    </style>

res-anim目录下动画
anim_fade_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="300"
     android:fillAfter="true"
    >
    <alpha
        android:fromAlpha="0"
        android:toAlpha="1"
        />
</set>

anim_fade_out.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
     android:duration="300"
     android:fillAfter="true"
    >
    <alpha
        android:fromAlpha="1"
        android:toAlpha="0"
        />
</set>

使用代码：

popWindowForHomeCategory = new PopWindowForHomeCategory(getActivity());
popWindowForHomeCategory.setOnDismissListener(xxx);
popWindowForHomeCategory.setOnItemClickListener(xxx);
popWindowForHomeCategory.showAsDropDown(view);