java - 在真实设备中显示通知的问题

Question

大家好，我为 android 应用程序创建了一个通知，我的代码在虚拟设备中工作，但在真实设备中不工作，请帮助我。

public void onClick(View v){
        try {
            NotificationCompat.Builder builder = new NotificationCompat.Builder(MainActivity.this);
            builder.setSmallIcon(R.mipmap.smile);
            builder.setShowWhen(true);
            builder.setContentText("This is my first notification");
            builder.setContentTitle("My Notification");
            builder.setAutoCancel(true);
            Intent i = new Intent(MainActivity.this, SecondClass.class);
            TaskStackBuilder stackBuilder = TaskStackBuilder.create(MainActivity.this);
            stackBuilder.addParentStack(SecondClass.class);
            stackBuilder.addNextIntent(i);
            PendingIntent pi = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
            builder.setContentIntent(pi);
            NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            nm.notify(0, builder.build());
            Toast.makeText(getApplicationContext(),"Notification showed!",Toast.LENGTH_LONG).show();
        }
        catch (Exception e){
            Toast.makeText(getApplicationContext(),e.toString(),Toast.LENGTH_LONG).show();
        }
}

Answer 1

原因可能是您的模拟器低于 api 级别 26（oreo）而您的手机，您所说的真实设备大于或等于 api 级别 26，从 oreo 开始，您需要创建通知通道才能显示通知。欲了解更多信息，请阅读此处。