效果图

popup_window_addition.xml

AdditionPopupWindow.java

package com.bu_ish.popup_window_example;import android.content.Context;import android.graphics.drawable.ColorDrawable;import android.view.LayoutInflater;import android.view.View;import android.widget.LinearLayout;import android.widget.PopupWindow;public class AdditionPopupWindow extends PopupWindow {    public AdditionPopupWindow(Context context) {        setWidth(LinearLayout.LayoutParams.WRAP_CONTENT);        setHeight(LinearLayout.LayoutParams.WRAP_CONTENT);        setBackgroundDrawable(new ColorDrawable());        setOutsideTouchable(true);        View view = LayoutInflater.from(context).inflate(R.layout.popup_window_addition, null);        setContentView(view);    }}

MainActivity.java

package com.bu_ish.popup_window_example;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findViewById(R.id.addImageView).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                AdditionPopupWindow popupWindow = new AdditionPopupWindow(MainActivity.this);                popupWindow.showAsDropDown(v);            }        });    }}

注意

要想点击外部关闭PopupWindow，必须调用setBackgroundDrawable(Drawable)和setOutsideTouchable(boolean)

完整Demo链接：，提取码：sluz