短视频程序源码，使用消息通知，不显示可能的原因

通知的安卓代码：

public class MyService extends Service {
…
public void onCreate() {
super.onCreate();
Log.d(“Myservice”, "onCreate execute ");
Intent intent = new Intent(this,MainActivity.class);
PendingIntent pi = PendingIntent.getActivity(this,0,intent,0);
Notification notification =new NotificationCompat.Builder(this)
.setContentTitle(“This is content title”)
.setContentTitle(“This is content text”)
.setTicker(“You have import thing to do it”)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
.setContentIntent(pi)
.build();
startForeground(1,notification);
}
}

这是安卓的服务中的代码，在活动MainActivity内要启动MyService:

case R.id.button2:
Intent intent = new Intent(this, MyService.class);
startService(intent);
break;

或者直接按钮的点击事件中显示通知：

case R.id.show:
Intent intent1 = new Intent(this,MainActivity.class);
PendingIntent pi = PendingIntent.getActivity(this,0,intent1,0);
NotificationManager manager =(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
Notification notification = null;
notification =new NotificationCompat.Builder(this)
.setContentTitle(“This is content title”)
.setContentTitle(“This is content text”)
.setWhen(System.currentTimeMillis())
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
.setContentIntent(pi)
.build();
manager.notify(2,notification);
break;