popupWindow的使用

    //1.创建PoP（必须包含：显示View、宽、高）
    final PopupWindow popupWindow = new PopupWindow(this);
    View inflate = LayoutInflater.from(this).inflate(R.layout.layout_item, null);
    popupWindow.setContentView(inflate);//显示的View控件
    popupWindow.setWidth(ViewGroup.LayoutParams.WRAP_CONTENT);//显示宽度
    popupWindow.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT);//显示高度
    popupWindow.setFocusable(true);//是否可以获取焦点

    PopupWindow popupWindow2 = new PopupWindow(inflate, ViewGroup.LayoutParams.MATCH_PARENT,
            ViewGroup.LayoutParams.MATCH_PARENT, true); 

    //5.点击外部可以消失
    popupWindow.setBackgroundDrawable(new ColorDrawable());
    popupWindow.setOutsideTouchable(true);

    //6.设置进出动画
    popupWindow.setAnimationStyle(R.style.popWindow);

    //2.显示
    //popupWindow.showAsDropDown(bB);//显示到相对某个控件的正下方
    //popupWindow.showAsDropDown(bB,-100,-200);//显示到某个控件正下方，同时与X/Y的偏移值
      popupWindow.showAtLocation(btn,Gravity.RIGHT|Gravity.BOTTOM,0,0);//相对父窗体的对齐方式

    //3.pop事件处理
    Button btn1 = inflate.findViewById(R.id.btn1);
    btn1.setOnClickListener(new View.OnClickListener() {//按钮事件监听处理
        @Override
        public void onClick(View v) {
            Toast.makeText(MainActivity.this,"弹出",Toast.LENGTH_SHORT).show();
        }
    });
    inflate.findViewById(R.id.ll).setOnClickListener(new View.OnClickListener() {//点击阴影关闭pop
        @Override
        public void onClick(View v) {
            //4.关闭Pop
            popupWindow.dismiss();
        }
    });

NotificationManager的使用

低版本

    //1.获取通知管理器类
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                                                                                                                                                   
    //延时意图
    Intent intent = new Intent(this,Main2Activity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this,100,intent,PendingIntent.FLAG_CANCEL_CURRENT);

    //2.构建通知类
    Notification.Builder builder = new Notification.Builder(this);
    builder.setSmallIcon(R.mipmap.ic_launcher);//设置小图标
    builder.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher));//设置大图标
    builder.setContentTitle("通知");//标题
    builder.setContentText("dadsadasdsadsa");//内容
    builder.setContentIntent(pendingIntent);//延时意图  ：  点击跳转页面
    builder.setAutoCancel(false);//自动消失
    builder.setDefaults(Notification.DEFAULT_ALL);//提示效果（震动、呼吸灯、声音提示）

    //3.获取通知
    Notification notification = builder.build();

    //4.发送通知
    notificationManager.notify(100,notification);

高版本

//1.获取通知管理器类
    NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                                                           
    //2.构建通知类
    String channelId = "1";
    String channelName = "default";
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel(channelId, channelName, NotificationManager.IMPORTANCE_DEFAULT);
        channel.enableLights(true);//开启指示灯,如果设备有的话。
        channel.setLightColor(Color.RED);//设置指示灯颜色
        channel.setShowBadge(true);//检测是否显示角标
        notificationManager.createNotificationChannel(channel);
    }

    //延时意图
    Intent intent = new Intent(this,Main2Activity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this,100,intent,PendingIntent.FLAG_CANCEL_CURRENT);
    //2.构建通知类
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, channelId);
    builder.setSmallIcon(R.mipmap.ic_launcher);//设置小图标
    builder.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher));//设置大图标
    builder.setContentTitle("通知");//标题
    builder.setContentText("dadsadasdsadsa");//内容
    builder.setContentIntent(pendingIntent);//延时意图  ：  点击跳转页面
    builder.setAutoCancel(false);//自动消失
    builder.setDefaults(Notification.DEFAULT_ALL);//提示效果（震动、呼吸灯、声音提示）
    //3.获取通知
    Notification notification = builder.build();
    //4.发送通知
    notificationManager.notify(100,notification);