我正在尋找一種在“設置”中創建首選項的方法,以便在Android應用中的特定時間(由用戶在設置中設置)發送通知.我看過像this這樣的不同線程,但是這在Android Oreo中不起作用.

有人可以幫我這個或者指點我一個教程嗎？

解決方法:

在查看了不同的帖子和對AlarmManager實現的一些研究后,這對我有用.

這個基礎是this帖子和Schedule重復警報Android Documentation.

這是我目前的實施：

我有一個SwitchPreference,而TimePicker實現是Settings

SwitchPreference詢問用戶是否要啟用重復每日通知.

TimePicker設置通知時間.

在MainActivity的OnCreate方法中或者在您閱讀SharedPreferences的任何地方執行此操作：

PreferenceManager.setDefaultValues(this, R.xml.preferences, false);

SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);

Boolean dailyNotify = sharedPref.getBoolean(SettingsActivity.KEY_PREF_DAILY_NOTIFICATION, true);

PackageManager pm = this.getPackageManager();

ComponentName receiver = new ComponentName(this, DeviceBootReceiver.class);

Intent alarmIntent = new Intent(this, AlarmReceiver.class);

PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);

AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);

// if user enabled daily notifications

if (dailyNotify) {

//region Enable Daily Notifications

Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(System.currentTimeMillis());

calendar.set(Calendar.HOUR_OF_DAY, sharedPref.getInt("dailyNotificationHour", 7));

calendar.set(Calendar.MINUTE, sharedPref.getInt("dailyNotificationMin", 15));

calendar.set(Calendar.SECOND, 1);

// if notification time is before selected time, send notification the next day

if (calendar.before(Calendar.getInstance())) {

calendar.add(Calendar.DATE, 1);

}

if (manager != null) {

manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),

AlarmManager.INTERVAL_DAY, pendingIntent);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

manager.setExactAndAllowWhileIdle(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);

}

}

//To enable Boot Receiver class

pm.setComponentEnabledSetting(receiver,

PackageManager.COMPONENT_ENABLED_STATE_ENABLED,

PackageManager.DONT_KILL_APP);

//endregion

} else { //Disable Daily Notifications

if (PendingIntent.getBroadcast(this, 0, alarmIntent, 0) != null && manager != null) {

manager.cancel(pendingIntent);

//Toast.makeText(this,"Notifications were disabled",Toast.LENGTH_SHORT).show();

}

pm.setComponentEnabledSetting(receiver,

PackageManager.COMPONENT_ENABLED_STATE_DISABLED,

PackageManager.DONT_KILL_APP);

}

接下來添加實現BroadcastReceiver的AlarmReceiver類,如下所示：

public class AlarmReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(Objects.requireNonNull(context));

SharedPreferences.Editor sharedPrefEditor = prefs.edit();

NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

Intent notificationIntent = new Intent(context, MainActivity.class);

notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP

| Intent.FLAG_ACTIVITY_SINGLE_TOP);

PendingIntent pendingI = PendingIntent.getActivity(context, 0,

notificationIntent, 0);

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {

NotificationChannel channel = new NotificationChannel("default",

"Daily Notification",

NotificationManager.IMPORTANCE_DEFAULT);

channel.setDescription("Daily Notification");

if (nm != null) {

nm.createNotificationChannel(channel);

}

}

NotificationCompat.Builder b = new NotificationCompat.Builder(context, "default");

b.setAutoCancel(true)

.setDefaults(NotificationCompat.DEFAULT_ALL)

.setWhen(System.currentTimeMillis())

.setSmallIcon(R.mipmap.ic_launcher_foreground)

.setTicker("{Time to watch some cool stuff!}")

.setContentTitle("My Cool App")

.setContentText("Time to watch some cool stuff!")

.setContentInfo("INFO")

.setContentIntent(pendingI);

if (nm != null) {

nm.notify(1, b.build());

Calendar nextNotifyTime = Calendar.getInstance();

nextNotifyTime.add(Calendar.DATE, 1);

sharedPrefEditor.putLong("nextNotifyTime", nextNotifyTime.getTimeInMillis());

sharedPrefEditor.apply();

}

}

}

如果設備電源關閉或重新啟動,系統將關閉AlarmManager,因此在BOOT COMPLETE上再次重新啟動它添加此類：

public class DeviceBootReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

if (Objects.equals(intent.getAction(), "android.intent.action.BOOT_COMPLETED")) {

// on device boot complete, reset the alarm

Intent alarmIntent = new Intent(context, AlarmReceiver.class);

PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, alarmIntent, 0);

AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

final SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(Objects.requireNonNull(context));

Calendar calendar = Calendar.getInstance();

calendar.setTimeInMillis(System.currentTimeMillis());

calendar.set(Calendar.HOUR_OF_DAY, sharedPref.getInt("dailyNotificationHour", 7));

calendar.set(Calendar.MINUTE, sharedPref.getInt("dailyNotificationMin", 15));

calendar.set(Calendar.SECOND, 1);

Calendar newC = new GregorianCalendar();

newC.setTimeInMillis(sharedPref.getLong("nextNotifyTime", Calendar.getInstance().getTimeInMillis()));

if (calendar.after(newC)) {

calendar.add(Calendar.HOUR, 1);

}

if (manager != null) {

manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),

AlarmManager.INTERVAL_DAY, pendingIntent);

}

}

}

}

最后不要忘記將這些權限添加到AndroidManidest：

并在AndroidManifest中注冊您的接收器

android:enabled="false">

如果用戶啟用了SwitchPreference,則應在TimePicker指定的日期的特定時間設置通知.

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