android - 应用程序打开时警报管理器不断触发

Question

我有一个问题，我希望有人能指出它发生的原因。我硬编码了我希望闹钟触发的日期，当第一次运行该应用程序时，它只会在那个时间点触发。但是，一旦触发警报，每次打开应用程序时，警报都会持续触发并显示通知。这只是一个小型应用程序测试，将用作更大应用程序的一部分，希望有人能帮助我

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>

Answer 1

我认为您的 MainActivity onCreate() 方法将在您重新打开应用程序的大部分时间被调用。因此，您将多次设置闹钟。以后的闹钟将设置为过去的时间(我假设您将第一个闹钟设置为当前时间)并将立即触发。