PopupWindow

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <alpha android:fromAlpha="0"
        android:toAlpha="1"
        android:duration="2000">
    alpha>
set> 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/ic_pop_bg"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textview1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text="选项一选项一选项一选项一选项一选项一"
        android:textSize="18sp" />

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#98FB98"
        />

    <TextView
        android:id="@+id/textview2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dp"
        android:text="选项二选项二选项二选项二选项二选项二"
        android:textSize="18sp" />

LinearLayout>

package com.turing.base.activity.popupWindowDemo;

import android.content.Context;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;

import com.turing.base.R;

public class PopupWindowAct extends AppCompatActivity {


    private Context mContext;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_popup_window);

        mContext = PopupWindowAct.this;
    }



    public void showPopupWindow(View view){

        initPopWindow(view);

    }



    private void initPopWindow(View v) {
        // 将自定义布局转换为View
        View view = LayoutInflater.from(mContext).inflate(R.layout.item_popup, null, false);
        TextView tv1 = (TextView) view.findViewById(R.id.textview1);
        TextView tv2 = (TextView) view.findViewById(R.id.textview2);

        //1.构造一个PopupWindow，参数依次是加载的View，宽高
        final PopupWindow popWindow = new PopupWindow(view,
                ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);
        //设置加载动画
        popWindow.setAnimationStyle(R.anim.anim_pop);

        //这些为了点击非PopupWindow区域，PopupWindow会消失的，如果没有下面的
        //代码的话，你会发现，当你把PopupWindow显示出来了，无论你按多少次后退键
        //PopupWindow并不会关闭，而且退不出程序，加上下述代码可以解决这个问题
        popWindow.setTouchable(true);
        popWindow.setTouchInterceptor(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // 这里如果返回true的话，touch事件将被拦截
                // 拦截后 PopupWindow的onTouchEvent不被调用，这样点击外部区域无法dismiss
                return false;
            }
        });
        //要为popWindow设置一个背景才有效
        popWindow.setBackgroundDrawable(new ColorDrawable(0x00000000));


        //设置popupWindow显示的位置，参数依次是参照View，x轴的偏移量，y轴的偏移量
        popWindow.showAsDropDown(v, 50, 0);

        //设置popupWindow里的按钮的事件
        tv1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(PopupWindowAct.this, "你点击了选项一~", Toast.LENGTH_SHORT).show();
            }
        });
        tv2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(PopupWindowAct.this, "你点击了选项二~", Toast.LENGTH_SHORT).show();
                popWindow.dismiss();
            }
        });
    }
}

WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL

　/**
     * Set whether this window is touch modal or if outside touches will be sent
     * to
     * other windows behind it.
     *
     */
    public static void setPopupWindowTouchModal(PopupWindow popupWindow,
            boolean touchModal) {
        if (null == popupWindow) {
            return;
        }
        Method method;
        try {

            method = PopupWindow.class.getDeclaredMethod("setTouchModal",
                    boolean.class);
            method.setAccessible(true);
            method.invoke(popupWindow, touchModal);

        }
        catch (Exception e) {
            e.printStackTrace();
        }

    }

setPopupWindowTouchModal(popupWindow, false);