应用程序打开时,警报管理器会一直触发

时间:2014-02-17 10:47:34

标签: android notifications broadcastreceiver alarmmanager

我有一个问题,我希望有些东西可以指出它为什么会发生。我硬编码了我想要触发警报的日期,并且在第一次运行应用程序时,它只会及时触发该实例。但是,一旦警报被触发,每次应用程序打开时,警报会不断触发并显示通知。这只是一个小应用测试,将用作更大的应用程序的一部分,并希望有人可以帮助我

package com.example.alarmtest;

import java.util.Calendar;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.view.Menu;

public class MainActivity extends Activity {

     private PendingIntent pendingIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


          Calendar calendar = Calendar.getInstance();


          calendar.set(Calendar.MONTH, Calendar.FEBRUARY);
          calendar.set(Calendar.YEAR, 2014);
          calendar.set(Calendar.DAY_OF_MONTH, 12);

          calendar.set(Calendar.HOUR_OF_DAY, 2);
          calendar.set(Calendar.MINUTE, 26 );
          calendar.set(Calendar.SECOND, 0);
          calendar.set(Calendar.AM_PM,Calendar.PM);

          Intent myIntent = new Intent(MainActivity.this, MyReceiver.class);
          pendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, myIntent,0);

          AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
          alarmManager.set(AlarmManager.RTC, calendar.getTimeInMillis(), pendingIntent);

    }



}

package com.example.alarmtest;


import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;

import android.content.Intent;
import android.os.IBinder;


public class MyAlarmService extends Service {

    private NotificationManager mManager;

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
    }


    @SuppressWarnings("deprecation")
    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // TODO Auto-generated method stub
        mManager = (NotificationManager) this.getApplicationContext().getSystemService(this.getApplicationContext().NOTIFICATION_SERVICE);
        Intent intent1 = new Intent(this.getApplicationContext(),MainActivity.class);






        Notification notification = new Notification(R.drawable.ic_launcher,"This is a test message!", System.currentTimeMillis());
        intent1.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP| Intent.FLAG_ACTIVITY_CLEAR_TOP);

        PendingIntent pendingNotificationIntent = PendingIntent.getActivity( this.getApplicationContext(),0, intent1,PendingIntent.FLAG_UPDATE_CURRENT);
        notification.flags |= Notification.FLAG_AUTO_CANCEL;
        notification.setLatestEventInfo(this.getApplicationContext(), "AlarmManagerDemo", "This is a test message!", pendingNotificationIntent);
        mManager.notify(0, notification);


        return super.onStartCommand(intent, flags, startId);
    }



     @Override
        public void onDestroy() 
        {
            // TODO Auto-generated method stub
            super.onDestroy();
        }



}

package com.example.alarmtest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;

public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent arg1) {
        Intent service1 = new Intent(context, MyAlarmService.class);
           context.startService(service1);

    }

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.alarmtest"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

     <uses-permission android:name="android.permission.WAKE_LOCK" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.alarmtest.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

         <activity
            android:name="com.example.alarmtest.NextActivity"
            android:label="Next Screen">
        </activity>

        <service android:name="com.example.alarmtest.MyAlarmService"
                 android:enabled="true" />

        <receiver android:name=".MyReceiver"/>
    </application>

</manifest>

2 个答案:

答案 0 :(得分:1)

我认为您重新打开应用的大部分时间都会调用MainActivity onCreate()方法。因此,您将多次设置警报。以后的警报将在过去设置(我假设您为当前时间设置了第一个警报)并将立即触发。

答案 1 :(得分:0)

好的,所以我有类似的情况,我将通过可能的修复,但首先让我们检查一下为什么会发生这种情况。

在我的情况下,当您打开应用程序时,它会设置当天的警报,例如,如果设置的警报在当前时间之前,它将在设置后立即触发。因为我在闹钟接收器中显示通知,大多数时候我打开应用程序,早上的闹钟弹出。这证实了上述情况。

要停止此操作,请检查仅为将来设置警报。或者将此检查放入警报接收器中,如果警报时间小于当前时间,则不要点火通知。

在设置闹钟之前,我将意图设置闹钟时间(以毫秒为单位):

long timestamp=1111882929;  // your alarm timestamp
alarmIntent.putExtra("timestamp",timestamp);
//... setAlarm...

当您收到onRecieve AlarmReceiver的{​​{1>}(在您的情况下,其Service类)时,请先显示检查,然后再显示以下通知:

if(intent.getLongExtra("timestamp",0)> System.currentTimeMillis())
{

showNotification(intent);
}
// else do nothing

此外,如果您设置具有相同待处理请求代码的警报,例如:

int CODE=112; // any code
PendingIntent alarmPendingIntent = PendingIntent.getBroadcast( context, CODE, alarmIntent, 0 );

这将使用代码112设置闹钟,再次使用此代码设置闹钟将再次覆盖它。