安卓8.0系统通知NotificationManager

开始

从Android 8.0开始,使用系统通知Notification需要再设置下Channel,这就导致了版本兼容问题.为了解决这个,抽空写了个工具类,实现8.0系统上下都可实现正常通知功能.

---

原型

以今日头条为例,每次打开应用时,通知栏都会显示今天比较火的新闻,并且会显示一张隐藏的图片,具体效果如下2张:

通知合并时

通知展开时

---

实现

我觉得还是直接上代码比较好,没有使用markdown,看着比较乱,复制到AS中格式化一波
下面是工具类NotificationUtil:
 

public class NotificationUtil extends ContextWrapper {

    private NotificationManager mManager;
    public static final String sID = "channel_1";
    public static final String sName = "channel_name_1";

    public NotificationUtil(Context context) {
        super(context);
    }

    public void sendNotification(String title, String content) {
        if (Build.VERSION.SDK_INT >= 26) {
            createNotificationChannel();
            Notification notification = getNotification_26(title, content).build();
            getmManager().notify(1, notification);
        } else {
            Notification notification = getNotification_25(title, content).build();
            getmManager().notify(1, notification);
        }
    }

    private NotificationManager getmManager() {
        if (mManager == null) {
            mManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        }
        return mManager;
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    public void createNotificationChannel() {
        NotificationChannel channel = new NotificationChannel(sID, sName, NotificationManager.IMPORTANCE_HIGH);
        getmManager().createNotificationChannel(channel);
    }

    public NotificationCompat.Builder getNotification_25(String title, String content) {

        // 以下是展示大图的通知
        android.support.v4.app.NotificationCompat.BigPictureStyle style = new android.support.v4.app.NotificationCompat.BigPictureStyle();
        style.setBigContentTitle("BigContentTitle");
        style.setSummaryText("SummaryText");
        style.bigPicture(BitmapFactory.decodeResource(getResources(),R.drawable.pic));

        // 以下是展示多文本通知
        android.support.v4.app.NotificationCompat.BigTextStyle style1 = new android.support.v4.app.NotificationCompat.BigTextStyle();
        style1.setBigContentTitle(title);
        style1.bigText(content);

        return new NotificationCompat.Builder(getApplicationContext())
                .setContentTitle(title)
                .setContentText(content)
                .setSmallIcon(R.drawable.ic_notification)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher_round))
                .setStyle(style)
                .setAutoCancel(true);
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    public Notification.Builder getNotification_26(String title, String content) {
        return new Notification.Builder(getApplicationContext(), sID)
                .setContentTitle(title)
                .setContentText(content)
                .setSmallIcon(R.drawable.ic_notification)
                .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher_round))
                .setStyle(new Notification.BigPictureStyle().bigPicture(BitmapFactory.decodeResource(getResources(),R.drawable.pic)))
                .setNumber(1)
                .setAutoCancel(true);
    }
}

使用方法:
NotificationUtil notificationUtils =new NotificationUtil(this);
notificationUtils.sendNotification(getString(R.string.title), getString(R.string.content));

---

效果

下面是在Android8.0原生系统上的两张显示效果:
 

通知合并时

通知展开时

---

题外话

发现竟然有很多同学不知道怎么制作通知栏图标,实际上AS提供了很完善的一套图标制作工具Image Asset用来制作App的各种图标.怎么用?在任何一个drawable文件夹上右键New->Image Asset弹出如下提示框:

通知栏图标制作

根据你的需求你可以制作出任何你想要的并且符合app规范的图片.

---

项目地址:

https://github.com/afterschoolkido/Android_Notification_Compatible

---

推荐阅读

1-AOSP源码Gallery2和Launcher3导入Android Studio
2-5分钟适配Android P和Android 8.0刘海屏，可能全网最全总结