PopupWindow定时关闭，点击外部或返回键关闭且取消定时任务

• 使用的是Handler的postDelayed方式实现定时任务——关闭PopupWindow
• 如果在定时任务执行之前，用户点击PopupWindow的外部或者back键关闭了弹出窗口，
  使用handler.removeCallbacks(r)，从handler的消息队列中remove之前的runnable对象的回调

package com.lichen.niceslim.util;

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.os.Handler;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager.LayoutParams;
import android.widget.PopupWindow;
import android.widget.TextView;

import com.lichen.niceslim.R;

public class QingQingPopup {

    /**
     * 普通显示PopupWindow
     * @param context 上下文对象
     * @param message 需要显示的信息
     */
    public static void show(Context context, String message) {
        View view = LayoutInflater.from(context).inflate(R.layout.dialog_toast, null);
        final PopupWindow pop = new PopupWindow(view, 
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, false);// 创建PopupWindow对象  
        TextView btn = (TextView) view.findViewById(R.id.toast_text); 
        pop.setBackgroundDrawable(new BitmapDrawable());//点击外边可消失 
        pop.setOutsideTouchable(true);//设置点击窗口外边窗口消失
        pop.setFocusable(true);//设置此参数获得焦点，否则无法点击
        btn.setText(message);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override 
            public void onClick(View v) {
                if(pop.isShowing()) {
                    pop.dismiss();//隐藏窗口，如果设置了点击窗口外小时即不需要此方式隐藏
                } else {
                    pop.showAsDropDown(v);//显示窗口
                } 
            } 
        }); 
        pop.showAtLocation(view, Gravity.CENTER, 0, 0);
    }

    /**
     * 定时关闭的PopupWindow
     * @param context 上下文对象
     * @param message 需要显示的信息
     */
    public static void showPopupWindowAutoDismiss(Context context, String message) {
        View view = LayoutInflater.from(context).inflate(R.layout.dialog_toast, null);
        final PopupWindow pop = new PopupWindow(view, 
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, false); 
        TextView btn = (TextView) view.findViewById(R.id.toast_text);
        btn.setText(message);
        pop.setBackgroundDrawable(new ColorDrawable(android.R.color.transparent));//点击外边可消失 
        pop.setOutsideTouchable(true);//设置点击窗口外边窗口消失
        pop.setFocusable(true);//设置此参数获得焦点，否则无法点击 

        final Runnable r = new Runnable() {
            @Override
            public void run() {
                if(pop.isShowing()) {
                    pop.dismiss();
                }
            }
        };
        final Handler handler = new Handler();//使用Handler做定时关闭PopupWindow
        pop.setOnDismissListener(new PopupWindow.OnDismissListener() {
            @Override
            public void onDismiss() {
                /**如果定时任务到达前执行了关闭窗口，则取消定时任务。
                此处是从handler的消息队列中remove之前的runnable对象的回调*/
                handler.removeCallbacks(r);
            }
        });
        pop.showAtLocation(view, Gravity.BOTTOM, 0, 0);
        handler.postDelayed(r, 2000);//2秒后自动关闭
    }

}