第三天

双击退出，Notitfcation 通知

1.双击退出

 /**
     * 该方法用来捕捉手机键盘被按下的事件。
     * @param keyCode  该参数指的是被按下的键的键盘码，手机键盘中每个按钮都会有其对应的键盘码，
     *                 在应用程序都是通过键盘码才知道用户按下的是哪个键。
     * @param event    当用户按下按键时，系统会自动将事件封装成KeyEvent对象供应用程序使用。
     *                 按键事件KeyEvent 按键事件有多种常量类型，比如 KEYCODE_BACK
     * @return
     */
     
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK ){
            //判断用户两次按键的时间差是否在一个预期值之内，是的话直接直接退出，不是的话提示用户再按一次后退键退出。
            if(System.currentTimeMillis() - exitTime > 2000){
                Toast.makeText(this,"在点就退出",Toast.LENGTH_SHORT).show();
                exitTime = System.currentTimeMillis();
                //当返回true时，表示已经完整地处理了这个事件，并不希望其他的回调方法再次进行处理，而当返回false时，
                // 表示并没有完全处理完该事件，更希望其他回调方法继续对其进行处理，
                return true;
            }else{
                finish(); //结束当前activity
            }
        }
        return super.onKeyDown(keyCode, event);
    }

Notification通知

1.普通通知

Java代码

/**
     * 普通通知
     * @param view
     */
    public void click(View view) {
        NotificationManager notificationManager = (NotificationManager)getSystemService(Context.NOTIFICATION_SERVICE);
        //创建构造者
        Notification.Builder builder = new Notification.Builder(this);
        //设置属性   setSamllIcon该属性必须设置
        builder.setSmallIcon(R.mipmap.ic_launcher);//必须设置
        builder.setContentTitle("我是标题"); //建议设置
        builder.setContentText("我是内容");//建议设置
        //创建对象.发送的就是这个对象
        Notification build = builder.build();
        //TODO :发送通知
        //参数一 id 通知的id(稍后介绍意义)   参数二 通知对象
        notificationManager.notify(1,build);
    }

2.可点击的通知

/**
     * 可点击的通知
     * @param view
     */
    public void click2(View view) {
        //构造管理者
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setContentText("我是内容");
        builder.setContentTitle("我是标题");
        builder.setAutoCancel(true);
        //点击跳转本页面
        Intent intent = new Intent(this, MainActivity.class);
        /**
         * 可简单一个延时的intent 当点击通知栏的信息时,才发送intent
         * 第一个参数是上下文
         * 第二个参数是 请求码,多个请求码不一样即可
         * 第三个参数是 intent
         * 第四个参数是 flags 可写0;
         */
        PendingIntent activity = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        //        builder.setAutoCancel(true); //点击消息通知取消
        //设置意图对象
        builder.setContentIntent(activity);
        Notification build = builder.build();
        notificationManager.notify(1,build);
    }

3.可弹出的通知

 /**
     * 可弹出的通知
     * @param view
     */
    public void click3(View view) {
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setContentText("我是内容");
        builder.setContentTitle("我是标题");
        builder.setAutoCancel(true);
        builder.setPriority(Notification.PRIORITY_MAX);
        builder.setDefaults(Notification.DEFAULT_ALL);
        Intent intent = new Intent(this, MainActivity.class);
        PendingIntent activity = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        builder.setContentIntent(activity);
        Notification build = builder.build();
        notificationManager.notify(1,build);
    }

4.大图通知

Java代码

/**
     * 大图通知
     * @param view
     */
    public void click4(View view) {
        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Notification.Builder builder = new Notification.Builder(this);
        builder.setContentTitle("大图通知");
        builder.setSmallIcon(R.mipmap.ic_launcher);
        //通知内容为大图片
        Notification.BigPictureStyle bigPictureStyle = new Notification.BigPictureStyle();
        bigPictureStyle.bigPicture(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher));
        builder.setStyle(bigPictureStyle);
        //不能跨APP
        Intent intent = new Intent(this, MainActivity.class);
        PendingIntent activity = PendingIntent.getActivity(this, 10, intent, PendingIntent.FLAG_ONE_SHOT);
        builder.setFullScreenIntent(activity,true);
        builder.setContentIntent(activity);
        notificationManager.notify(1,builder.build());
    }

5.列表通知

Java代码

/**
     * 列表通知
     * @param view
     */
    public void click5(View view) {
        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setContentTitle("列表通知");
        //通知内容为列表显示
        Notification.InboxStyle inboxStyle = new Notification.InboxStyle();
        inboxStyle.addLine("李白");
        inboxStyle.addLine("猴子");
        inboxStyle.addLine("石卓凡");
        builder.setStyle(inboxStyle);
        //不能跨APP
        Intent intent = new Intent(this, MainActivity.class);
        PendingIntent activity = PendingIntent.getActivity(this, 10, intent, PendingIntent.FLAG_ONE_SHOT);
        builder.setFullScreenIntent(activity,true);
        builder.setContentIntent(activity);
        notificationManager.notify(1,builder.build());
    }

6.自定义通知

Java代码

 /**
     * 自定义通知
     * @param view
     */
    public void click6(View view) {
        Notification.Builder builder = new Notification.Builder(this);
        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setContentText("内容");
        builder.setContentTitle("头部");

        /**
         * RemoteViews是可以在别的进程（系统进程）中显示的View，并且提供了一组跨进程更新它界面的操作
         * 两个参数,第一个布局所在包名
         * 第二个是布局Id
         * 布局文件是自己创建的,随便一个线性布局,加一个textView和ImageView即可
         */

        RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.layout);
        /**
         * 由于运行在不同的进程中，所以RemoteViews无法像正常的View一样更新UI。
         * RemoteViews提供了一系列的set方法，但是这些set方法只是View全部方法的子集。
         */

        //都是两个参数,第一个参数相当于findViewById,第二个是设置一个值.
        remoteViews.setTextViewText(R.id.textview,"啦啦啦,种太阳");
        remoteViews.setImageViewResource(R.id.imagebiew,R.mipmap.ic_launcher_name);

        builder.setCustomContentView(remoteViews);
        Notification build = builder.build();
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(1,build);

    }

7.分组通知

Java代码

/**
     * 分组通知
     * @param view
     */
    public void click7(View view) {
        NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Notification.Builder builder = new Notification.Builder(this);
        Notification.Builder builder1 = new Notification.Builder(this);
        Notification.Builder builder2 = new Notification.Builder(this);
        Notification.Builder builder3 = new Notification.Builder(this);

        //消息分组属性,group相同才能分到一组
        builder.setGroup("2");
        builder.setSmallIcon(R.mipmap.ic_launcher_name);
        //被设置setGroupSummary为true的消息会隐藏内容,其内容会显示另外分组成员信息.
        builder.setGroupSummary(true);
        builder.setContentText("lalalalalala111");
        builder.setContentTitle("luelueluelue111");


        //消息分组属性,group相同才能分到一组
        builder1.setGroup("2");
        builder1.setSmallIcon(R.mipmap.ic_launcher_name);
        //被设置setGroupSummary为true的消息会隐藏内容,其内容会显示另外分组成员信息
//        builder1.setGroupSummary(true);
        builder1.setContentText("lalalalalala222");
        builder1.setContentTitle("luelueluelue222");

        builder2.setGroup("2");
        builder2.setSmallIcon(R.mipmap.ic_launcher_name);
//        builder2.setGroupSummary(true);
        builder2.setContentText("lalalalalala333");
        builder2.setContentTitle("luelueluelue333");

        builder3.setGroup("2");
        builder3.setSmallIcon(R.mipmap.ic_launcher_name);
//        builder3.setGroupSummary(true);
        builder3.setContentText("lalalalalala444");
        builder3.setContentTitle("luelueluelue444");

        notificationManager.notify(0,builder.build());
        notificationManager.notify(1,builder1.build());
        notificationManager.notify(2,builder2.build());
        notificationManager.notify(3,builder3.build());

    }

8.进度条通知

Java代码

/**
     * 进度条通知
     * @param view
     */
    public void click8(View view) {
        final NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        //TODO 2:创建构造者
        final Notification.Builder builder = new Notification.Builder(this);
        //TODO 3:设置属性   setSamllIcon该属性必须设置
        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setContentTitle("我是标题");
        //TODO 设置进度条
        //参数一 最大值 参数二：当前进度 参数三 是否模糊
        //    builder.setProgress(100,50,true);
        final Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            int progress;
            @Override
            public void run() {
                //1.模拟下载过程
                builder.setContentText("正在下载,当前进度"+progress);
                builder.setProgress(100,progress,false).setColor(Color.BLUE);//确定的进度条
                progress+=10;
                notificationManager.notify(6,builder.build());
                if (progress==100){
                    //2.安装过程
                    builder.setContentText("正在安装");
                    builder.setProgress(0,0,true);//安装模糊
                    notificationManager.notify(6,builder.build());
                    try {
                        Thread.sleep(7000);//模拟安装过程
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    //3.安装完成
                    notificationManager.cancel(6);//取消置顶的通知
                    timer.cancel();
                }
            }
        },0,1000);
    }