be at one's books 的结实?

Posted 2023-05-06

是不是用功学习

词霸上没有，所以这里一下

参考技术A 是"在看书, 在读书"的中性意思.
根据上下文,可以引申为"用功学习"或"心不在焉地看书".

http://72.14.203.104/search?q=cache:CcDcmLvwMWQJ:homepage.mac.com/thorntonstreiff/Todd_Poetry.html++%22am+at+my+books%22&hl=en&gl=us&ct=clnk&cd=1

http://www.thing.net/~xaf/mccoy/smapp/button.html

Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified

最近在写代码时碰到如下错误：

java.lang.IllegalArgumentException: com.example.imdemo: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent.
Strongly consider using FLAG_IMMUTABLE, only use FLAG_MUTABLE if some functionality depends on the PendingIntent being mutable, e.g. if it needs to be used with inline replies or bubbles.

出错的代码主要是在创建通知栏消息时抛出的，主要代码如下：

private void createNotification() 
    Intent intent = new Intent(this, OtherActivity.class);
    // 这一行报错
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 123, intent, PendingIntent.FLAG_ONE_SHOT);
    NotificationCompat.Builder builder = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID)
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle("测试")
            .setContentText("收到一条通知消息")
            .setContentIntent(pendingIntent)
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setAutoCancel(true);
    Notification build = builder.build();
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) 
        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.createNotificationChannel(
                new NotificationChannel(NOTIFICATION_CHANNEL_ID, "测试测试", NotificationManager.IMPORTANCE_HIGH)
        );
    
    NotificationManagerCompat.from(this).notify(notificationId++, build);

查了一番资料后，发现如下几个修复的方法：

1. 将项目的targetSdkVersion由31改为30

2. 如果不想改targetSdkVersion，那就在在创建PendingIntent的时候判断当前系统版本，根据不同系统版本创建带有不同flag的PendingIntent，具体代码实现如下：

   PendingIntent pendingIntent;
   if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.S) 
       pendingIntent = PendingIntent.getActivity(this, 123, intent, PendingIntent.FLAG_IMMUTABLE);
    else 
       pendingIntent = PendingIntent.getActivity(this, 123, intent, PendingIntent.FLAG_ONE_SHOT);
   
   

3. 直接在项目中依赖下面的库

   dependencies 
     // For Java
     implementation 'androidx.work:work-runtime:2.7.1' 
    
     // For Kotlin
     implementation 'androidx.work:work-runtime-ktx:2.7.1'
   
   

这里最推荐的是使用上面的方法2。