大家好，我為 android 應用程序創(chuàng)建了一個通知，我的代碼在虛擬設備中工作，但在真實設備中不工作，請幫助我。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();        }}