Question

我需要每隔30秒启动闹钟，我需要在不运行应用程序的情况下激活它。但无论应用程序是否运行，AlarmReceiver都不会被调用。有什么建议？ start方法在MainActivity.java类

中

 public void start() {
    Calendar calendar=Calendar.getInstance();
    calendar.add(Calendar.SECOND, 30);
    Intent intent = new Intent(MainActivity.this, AlarmReceiver.class);
    PendingIntent pintent = PendingIntent.getService(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager alarm = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    alarm.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pintent);
    Log.d("alarm","alarm set for alarm receiver");
}

我的接收器文件

public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
   // Toast.makeText(context,"Alarm Receiver ",Toast.LENGTH_SHORT).show();
    Log.d("Alarm","Alarm receive");

}

}

清单文件：

<?xml version="1.0" encoding="utf-8"?>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"

    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity" android:configChanges="keyboardHidden|orientation|screenSize">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service android:name=".GetLocationService"/>
    <receiver android:name=".AlarmReceiver" android:enabled="true"/>
</application>

这里我可以设置闹钟，但我没有收到闹钟

Answer 1

在此页面中，您需要完成一个示例：

https://www.thepolyglotdeveloper.com/2014/10/use-broadcast-receiver-background-services-android/

显然你必须改变这条线：

PendingIntent pintent = PendingIntent.getService(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

要

PendingIntent pintent = PendingIntent.getBroadcast(MainActivity.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

将您的开始方法更改为：

public void start() {
    Intent alarmIntent = new Intent(this, AlarmReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
    AlarmManager manager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
    int interval = 30 * 1000; // 30 seconds of interval.
    manager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);
    Toast.makeText(this, "Alarm Set", Toast.LENGTH_SHORT).show();
}

如果有效，请告诉我。

Answer 2

我最近遇到了这个问题。问题出在我的自定义 Parcelable 对象上，使用原语可以正常工作。这个答案对我有帮助：Sending Extras to onReceive only retrieves ALARM_COUNT

是每隔30秒设置闹钟的正确方法???

2 个答案: