Question

我尝试让我的应用程序使用AlarmManager在5秒后发送通知，但pendingIntent似乎没有被调用。继承我的代码

在MainActivity中的onCreate：

Long alertTime = new GregorianCalendar().getTimeInMillis()+5*1000;
    Intent alertIntent = new Intent(this, Notification.class);
    AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    alarmManager.set(AlarmManager.RTC_WAKEUP, alertTime , PendingIntent.getBroadcast(this, 1, alertIntent, PendingIntent.FLAG_UPDATE_CURRENT));

Notification.class：

public class Notification extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
    PendingIntent notificIntent = PendingIntent.getActivity(context, 0, new Intent(context, MainActivity.class), 0);
    NotificationCompat.Builder mBuilder =  new NotificationCompat.Builder(context);
            mBuilder.setSmallIcon(R.drawable.ic_launcher)
            .setContentTitle("Title")
            .setTicker("Ticker")
            .setContentText("Text");
    mBuilder.setContentIntent(notificIntent);
    mBuilder.setDefaults(NotificationCompat.DEFAULT_VIBRATE);
    mBuilder.setAutoCancel(true);
    NotificationManager mNotificationManager =
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    mNotificationManager.notify(1, mBuilder.build());

}

}

Android Manifest：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.wouter.lifetracker"
android:versionCode="1"
android:versionName="1.0" android:installLocation="auto">

<uses-sdk
    android:minSdkVersion="11"
    android:targetSdkVersion="21" />
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<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=".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>
    <receiver
        android:name=".Notification"
        >
        </receiver>

</application>

我搜索了几个小时，但我无法找出为什么没有发生

Answer 1

参见：https://developer.android.com/reference/android/app/AlarmManager.html#set(int，long，android.app.PendingIntent）

注意：从API 19开始，传递给此方法的触发时间是 视为不精确：此时间之前不会发出警报，但可能会推迟并在一段时间后交付。操作系统将使用这个政策是为了在整个过程中“批处理”警报系统，最大限度地减少设备需要“唤醒”的次数并尽量减少电池使用。一般来说，警报安排在附近只要警报安排在远期，将来不会推迟将来

Answer 2

只有5秒钟？

试试这个：

new Handler().postDelayed(new Runnable() {
                public void run() {
                showNotification(); //your notification code called after 5 seconds
                }
            }, 5 * 1000); // 5 seconds...

或尝试：

long alertTime = System.currentTimeMillis() + (5 * 1000); // <-- try this
Intent alertIntent = new Intent(this, Notification.class);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, alertTime , PendingIntent.getBroadcast(this, 1, alertIntent, PendingIntent.FLAG_UPDATE_CURRENT));

为什么我的AlarmManager没有调用Pendingintent

2 个答案: