我做了一些研究，并尝试实施一次性警报，向用户发送通知，但由于某种原因我无法理解，当时机成熟时，警报未被激活。我认为onReceive方法没有被调用，但我不知道为什么，因为它是我第一次尝试实现警报。
===编辑：似乎警报的onReceive正在起作用，我收到了祝酒消息＆＃34;警报!!＆＃34;在合适的时间（不知道为什么它在我第一次测试时没有），但没有收到通知，但是......有任何线索吗？
这是Alarm类的代码：
public class Alarm extends BroadcastReceiver {
public static final String PREFS_FILE_NAME = MainActivity.PREFS_FILE_NAME;
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
// send notification
Toast.makeText(context, "Alarm!!", Toast.LENGTH_SHORT).show();
// API < 16 so have to use compat
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context)
.setContentTitle(context.getResources().getString(R.string.memo_test_ready))
.setContentText(context.getResources().getString(R.string.click_to_start));
Intent resultIntent = new Intent(context, UpcomingTest.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addParentStack(UpcomingTest.class);
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent =
stackBuilder.getPendingIntent(
0,
PendingIntent.FLAG_UPDATE_CURRENT
);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager =
(NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.notify(123, mBuilder.build());
}
public void Set(Context context)
{
DatabaseHandler db = new DatabaseHandler(context);
MemoryTestLevel memoTestLevel = new MemoryTestLevel();
long timeInterval;
long memoryTest_dateTime;
String alarmMemoLevel;
List<Phrase> studyPhrasesList = db.getPhrasesWithState(Phrase.START_STUDYING);
if (studyPhrasesList.size() > 0 ){ // if there are any phrases here, update them; dateTime == level 1
alarmMemoLevel = "Level 1 ";
memoTestLevel = db.getMemoryTestLevelWithLevel(MemoryTestLevel.LEVEL_1);
timeInterval = memoTestLevel.getTimeInterval();
TestDateTimeCalculator datetimeCalc = new TestDateTimeCalculator();
memoryTest_dateTime = datetimeCalc.calculate(timeInterval);
for(Phrase phrase : studyPhrasesList){
phrase.setMemoryTestPending(memoTestLevel.getMemoryTest_id(), memoryTest_dateTime);
db.updatePhrase(phrase);
}
} else {
// if there are no phrases to be set at level 1, then get the lowest memoTest_datime of
// the ones that are pending
alarmMemoLevel = "next after L1 ";
memoryTest_dateTime = db.getLowestMemoTestDateTime();
}
/* 2. Set new Alarm
* 2.1. Determine which phrases will go into this new alarm */
List<Phrase> nextMemoryTestPhrases = db.getNextMemoryTestPhrases(memoryTest_dateTime);
for(Phrase phrase : nextMemoryTestPhrases) {
phrase.setState(Phrase.MEMORY_TEST_SCHEDULED);
db.updatePhrase(phrase);
}
// 2.3 set alarm for required dateTime
AlarmManager alarmMgr = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, Alarm.class);
PendingIntent pendingInt = PendingIntent.getBroadcast(context, 0, intent, 0);
alarmMgr.set(AlarmManager.RTC_WAKEUP, memoryTest_dateTime, pendingInt);
// 2.4 save the alarm.dateTime in the preferences so it can be used in the "upcoming test" activity
SharedPreferences preferences = context.getSharedPreferences(PREFS_FILE_NAME, Context.MODE_PRIVATE);
Editor editor = preferences.edit();
editor.putLong("NEXT_TEST_DATETIME", memoryTest_dateTime);
SimpleDateFormat sdf = new SimpleDateFormat("EEE, MMM d, yyyy hh:mm");
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(memoryTest_dateTime);
String nextTestDateStr = sdf.format(calendar.getTime());
Toast.makeText(context, "Alarm set to " + alarmMemoLevel + nextTestDateStr, Toast.LENGTH_LONG).show();
editor.commit();
}
public void Cancel(Context context)
{
Intent intent = new Intent(context, MyBroadcastReceiver.class);
PendingIntent sender = PendingIntent.getBroadcast(context, 0, intent, 0);
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(sender);
}
}
我有一个广播接收器，以防手机重启：
public class MyBroadcastReceiver extends BroadcastReceiver {
public static final String PREFS_FILE_NAME = MainActivity.PREFS_FILE_NAME;
@Override
public void onReceive(Context context, Intent intent) {
// TODO setup alarm again (get datetime from system)
Alarm alarm = new Alarm();
if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED"))
{
SharedPreferences preferences = context.getSharedPreferences(PREFS_FILE_NAME, Context.MODE_PRIVATE);
long nextTestDateInMillis = preferences.getLong("NEXT_TEST_DATETIME", 0);
if(nextTestDateInMillis > 0){
alarm.Set(context);
}
}
}
}
从我发现的研究中，我的清单中似乎缺少/错误。这就是我在那里：
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"></uses-permission>
以下是申请内容：
<receiver android:name="liliana.phrasememo.util.MyBroadcastReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<receiver android:process=":remote" android:name="liliana.phrasememo.util.Alarm"/>
另外，如果您在我的警报+通知实施中看到其他任何错误，那么让我头脑清醒是很棒的。非常感谢你： - ）
答案 0 :(得分：0)
设置闹钟可能是这段代码可以帮助你
Intent myIntent = new Intent(yourcontext, Alarm.class);
PendingIntent pendingIntent = PendingIntent.getService(act, 0, myIntent, 0);
AlarmManager alarmManager = (AlarmManager)act.getSystemService(act.ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, 8);
calendar.set(Calendar.MINUTE,22);
calendar.set(Calendar.SECOND, 0);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
你也必须实现服务而不是broadcastreciever才能在闹钟时间运行
答案 1 :(得分：0)
非常感谢回答发布的here，我的代码中缺少的是通知图标，我已添加如下：
NotificationCompat.Builder mBuilder =
new NotificationCompat.Builder(context)
.setSmallIcon(R.drawable.ic_launcher) // this was missing
.setContentTitle(context.getResources().getString(R.string.memo_test_ready))
.setContentText(context.getResources().getString(R.string.click_to_start));
事实上，如果我们查看documentation，它会指定小图标必须位于通知中：
Required notification contents
A Notification object must contain the following:
A small icon, set by setSmallIcon()
A title, set by setContentTitle()
Detail text, set by setContentText()
LogCat确实找不到文件错误：
05-05 12:39:39.191: A/NetworkStats(89): Caused by: java.io.FileNotFoundException: /proc/net/xt_qtaguid/stats: open failed: ENOENT (No such file or directory)
但它不会造成任何崩溃，所以你可能没有意识到这一点。我不确定是否可以向通知构造函数本身添加任何内容，以便用户立即看到缺少某些内容。我没有非常先进的Java知识。