在指定时间未触发报警和通知

Question

我试图在指定时间触发通知和警报。我已经将日志信息放在控制台上，以查看是否设置了正确的时间，并且一切正常。但是，仍然没有触发警报。请帮忙。

创建通知和警报的/Code/

btn_add_task.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                db.addTask(new DataModel(input_task_title.getText().toString(),input_task_desc.getText().toString(),
                        checkBox.isChecked(),txtDate.getText().toString(),txtTime.getText().toString(),isComplete));

                Calendar calendar = Calendar.getInstance();
                //Set notification for the set date and time
                calendar.set(Calendar.MONTH, month);
                calendar.set(Calendar.YEAR, year);
                calendar.set(Calendar.DAY_OF_MONTH, day);
                calendar.set(Calendar.HOUR_OF_DAY, hour);
                calendar.set(Calendar.MINUTE, minute);
                calendar.set(Calendar.SECOND, 0);
                if(mHour>12) {
                    calendar.set(Calendar.AM_PM, Calendar.PM);
                } else {
                    calendar.set(Calendar.AM_PM, Calendar.AM);
                }

                Log.i("Alarm at: ",calendar.get(Calendar.DAY_OF_MONTH)+"-"+
                        calendar.get(Calendar.MONTH)+"-"+
                        calendar.get(Calendar.YEAR)+" at "+
                        calendar.get(Calendar.HOUR_OF_DAY)+":"+
                        calendar.get(Calendar.MINUTE));

                Intent notifyMessage = new Intent(getApplicationContext(),NotificationMessage.class);
                PendingIntent pi = PendingIntent.getService(getApplicationContext(), 0, notifyMessage, PendingIntent.FLAG_UPDATE_CURRENT);
                AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
                am.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),AlarmManager.INTERVAL_DAY,pi);

                Toast.makeText(getApplicationContext(),R.string.new_task_added,Toast.LENGTH_LONG).show();
                startActivity(new Intent(AddTask.this,MainActivity.class));
            }
        });

/通知消息类/

package com.apps.katz.doer;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.util.Log;

/**
 * Created by katz on 4/5/16.
 */
public class NotificationMessage extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent intent) {
        showNotification(context);
    }

    private void showNotification(Context context) {
        Log.i("notification","visible");
        PendingIntent contentIntent = PendingIntent.getActivity(context,0,
                new Intent(context,NotificationMessage.class),0);
        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(context).setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle("Doer Notification")
                .setContentText("This is a Doer Notification");
        mBuilder.setContentIntent(contentIntent);
        mBuilder.setDefaults(Notification.DEFAULT_SOUND);
        mBuilder.setDefaults(Notification.DEFAULT_VIBRATE);
        mBuilder.setDefaults(Notification.DEFAULT_LIGHTS);
        mBuilder.setAutoCancel(true);
        NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(1,mBuilder.build());
    }
}

请帮帮我，我做错了什么？

Answer 1

btn_add_task监听器内部，设置闹钟如下-

Intent notifyMessage = new Intent(getApplicationContext(),NotificationMessage.class);
PendingIntent pi = PendingIntent.getBroadcast(getApplicationContext(), 0, notifyMessage, PendingIntent.FLAG_UPDATE_CURRENT);    
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
am.setRepeating(AlarmManager.RTC_WAKEUP,calendar.getTimeInMillis(),AlarmManager.INTERVAL_DAY,pi);

现在，在NotificationMessage类的onReceive中放置一个日志，以确保及时触发警报。希望，现在您的程序将运行。

Answer 2

看看setRepeating方法的留档：

注意：从API 19开始，所有重复警报都是不精确的。如果您的应用程序需要精确的交付时间，那么它必须使用一次性精确警报，并如上所述重新安排每次。目标SdkVersion早于API 19的旧版应用程序将继续将其所有警报（包括重复警报）视为精确。

您的警报将不准确总是使用setRepeating，尝试使用setExact并在触发警报时重新编程。

此外，请尝试扩展WakefulBroadcastReceiver，而不是在NotificationMessage中扩展WakefulBroadcastReceiver，以便在应用程序未运行时唤醒服务。