我该怎么做呢?有什么教程吗? 请提供链接。
首先,您需要使用BroadcastReceiver。由于广播接收器仅运行短时间
根据Android开发者博客所述,当处理广播时,应用程序会被分配一个固定的时间(目前为10秒)来完成其工作。如果在该时间内未完成,应用程序被视为行为不当,并立即将其进程置于后台状态以便在需要时释放内存。
在这里使用IntentService是更好的做法,以下是如何实现的示例。
这是广播接收器类。
public class MyReceiver extends BroadcastReceiver {
public MyReceiver() {
}
@Override
public void onReceive(Context context, Intent intent) {
Intent intent1 = new Intent(context, MyNewIntentService.class);
context.startService(intent1);
}
}
并将其在清单文件中注册。
<receiver
android:name=".MyReceiver"
android:enabled="true"
android:exported="false" >
</receiver>
这是意图服务类。
public class MyNewIntentService extends IntentService {
private static final int NOTIFICATION_ID = 3;
public MyNewIntentService() {
super("MyNewIntentService");
}
@Override
protected void onHandleIntent(Intent intent) {
Notification.Builder builder = new Notification.Builder(this);
builder.setContentTitle("My Title");
builder.setContentText("This is the Body");
builder.setSmallIcon(R.drawable.whatever);
Intent notifyIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 2, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);
//to be able to launch your activity from the notification
builder.setContentIntent(pendingIntent);
Notification notificationCompat = builder.build();
NotificationManagerCompat managerCompat = NotificationManagerCompat.from(this);
managerCompat.notify(NOTIFICATION_ID, notificationCompat);
}
}
并在清单文件中注册它。
<service
android:name=".MyNewIntentService"
android:exported="false" >
</service>
然后在您的活动中设置闹钟管理器以在特定时间启动广播接收器,并使用AlarmManager setRepeating方法重复它。以下示例将每天重复。
Intent notifyIntent = new Intent(this,MyReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast
(context, NOTIFICATION_REMINDER_NIGHT, notifyIntent, PendingIntent.FLAG_UPDATE_CURRENT);
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(),
1000 * 60 * 60 * 24, pendingIntent);
希望这能对你有所帮助。
AlarmManager
在指定的时间设置闹钟。SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
if (!prefs.getBoolean("firstTime", false)) {
Intent alarmIntent = new Intent(this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent, 0);
AlarmManager manager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 7);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 1);
manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, pendingIntent);
SharedPreferences.Editor editor = prefs.edit();
editor.putBoolean("firstTime", true);
editor.apply();
}
我使用SharedPreferences
来检查是否第一次运行该应用程序,如果是,则设置该警报,否则不执行任何操作,而不是每次启动应用程序时重置警报。
使用BroadcastReceiver
监听警报触发事件
public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// show toast
Toast.makeText(context, "Alarm running", Toast.LENGTH_SHORT).show();
}
}
使用另一个接收器来监听设备启动,以便您可以重置警报。
public class DeviceBootReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
// on device boot compelete, 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);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 7);
calendar.set(Calendar.MINUTE, 0);
calendar.set(Calendar.SECOND, 1);
manager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
AlarmManager.INTERVAL_DAY, pendingIntent);
}
}
}
将权限添加到清单文件中
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
然后注册您的接收器
<receiver android:name=".DeviceBootReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<receiver android:name=".AlarmReceiver" />
SharedPreference
在第二天会如何工作?因为布尔值将变为false。 - Si8SharedPreferences
只在应用程序第一次启动时工作以设置闹钟,然后将布尔值设置为 true,即应用程序已经启动过,以避免反复重置闹钟。 - SaNtoRiaNSerializable
对象没有被包装在Bundle
中,则可能会变成null:请参见此答案。 - Benoit Duffez由于后台服务限制,接受答案中的解决方案在安卓8.0(API级别26)及以上版本中将无法正常工作(https://developer.android.com/about/versions/oreo/background.html#services),并且当应用程序在后台运行时会导致以下异常:
java.lang.IllegalStateException: Not allowed to start service Intent xxx: app is in background
可能的解决方案之一是使用JobIntentService
:
将您的Service
扩展自JobIntentService
,而不是IntentService
,并使用onHandleWork
方法替换onHandleIntent
。
在AndroidManifest.xml
中为您的Service
添加android:permission="android.permission.BIND_JOB_SERVICE"
。
这是我针对Android 10测试过并且适用于之前所有版本的解决方案。
MainActivity.class
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
....
reminderNotification();
}
public void reminderNotification()
{
NotificationUtils _notificationUtils = new NotificationUtils(this);
long _currentTime = System.currentTimeMillis();
long tenSeconds = 1000 * 10;
long _triggerReminder = _currentTime + tenSeconds; //triggers a reminder after 10 seconds.
_notificationUtils.setReminder(_triggerReminder);
}
NotificationUtils.class
public class NotificationUtils extends ContextWrapper
{
private NotificationManager _notificationManager;
private Context _context;
public NotificationUtils(Context base)
{
super(base);
_context = base;
createChannel();
}
public NotificationCompat.Builder setNotification(String title, String body)
{
return new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.noti_icon)
.setContentTitle(title)
.setContentText(body)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_DEFAULT);
}
private void createChannel()
{
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
{
NotificationChannel channel = new NotificationChannel(CHANNEL_ID, TIMELINE_CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT);
channel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);
getManager().createNotificationChannel(channel);
}
}
public NotificationManager getManager()
{
if(_notificationManager == null)
{
_notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
}
return _notificationManager;
}
public void setReminder(long timeInMillis)
{
Intent _intent = new Intent(_context, ReminderBroadcast.class);
PendingIntent _pendingIntent = PendingIntent.getBroadcast(_context, 0, _intent, 0);
AlarmManager _alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
_alarmManager.set(AlarmManager.RTC_WAKEUP, timeInMillis, _pendingIntent);
}
}
ReminderBroadcast.class
public class ReminderBroadcast extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
NotificationUtils _notificationUtils = new NotificationUtils(context);
NotificationCompat.Builder _builder = _notificationUtils.setNotification("Testing", "Testing notification system");
_notificationUtils.getManager().notify(101, _builder.build());
}
}
AndroidManifest.xml
<application>
...
<receiver android:name=".custom.ReminderBroadcast"/>
</application>
NB: CHANNEL_ID
和TIMELINE_CHANNEL_NAME
已经在另一个类中创建。
例如,
CHANNEL_ID = "通知渠道"
;
TIMELINE_CHANNEL_NAME = "时间线通知"
;
如果对我的代码有任何误解或错误,请不要犹豫,留言评论。我会尽快回复。
相应的示例代码:
alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
alarmIntent = new Intent(context of current file, AlarmReceiver1.class);
AlarmReceiver1 = broadcast receiver
pendingIntent = PendingIntent.getBroadcast( Menu.this, 0, alarmIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
alarmIntent.setData((Uri.parse("custom://"+System.currentTimeMillis())));
alarmManager.cancel(pendingIntent);
Calendar alarmStartTime = Calendar.getInstance();
Calendar now = Calendar.getInstance();
alarmStartTime.set(Calendar.HOUR_OF_DAY, 8);
alarmStartTime.set(Calendar.MINUTE, 00);
alarmStartTime.set(Calendar.SECOND, 0);
if (now.after(alarmStartTime)) {
Log.d("Hey","Added a day");
alarmStartTime.add(Calendar.DATE, 1);
}
alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
alarmStartTime.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
Log.d("Alarm","Alarms set for everyday 8 am.");
public class AlarmReceiver1 extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Intent service1 = new Intent(context, NotificationService1.class);
service1.setData((Uri.parse("custom://"+System.currentTimeMillis())));
context.startService(service1);
}
通知构建服务代码片段:
public class NotificationService1 extends IntentService{
private NotificationManager notificationManager;
private PendingIntent pendingIntent;
private static int NOTIFICATION_ID = 1;
Notification notification;
@Override
protected void onHandleIntent(Intent intent) {
Context context = this.getApplicationContext();
notificationManager =
(NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
Intent mIntent = new Intent(this, Activity to be opened after clicking on the
notif);
Bundle bundle = new Bundle();
bundle.putString("test", "test");
mIntent.putExtras(bundle);
pendingIntent = PendingIntent.getActivity(context, 0, mIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
Resources res = this.getResources();
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
Uri soundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
notification = new NotificationCompat.Builder(this)
.setContentIntent(pendingIntent)
.setSmallIcon(R.drawable.ic_launcher)
.setLargeIcon(BitmapFactory.decodeResource(res, R.drawable.ic_launcher))
.setTicker("ticker value")
.setAutoCancel(true)
.setPriority(8)
.setSound(soundUri)
.setContentTitle("Notif title")
.setContentText("Text").build();
notification.flags |= Notification.FLAG_AUTO_CANCEL | Notification.FLAG_SHOW_LIGHTS;
notification.defaults |= Notification.DEFAULT_SOUND | Notification.DEFAULT_VIBRATE;
notification.ledARGB = 0xFFFFA500;
notification.ledOnMS = 800;
notification.ledOffMS = 1000;
notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(NOTIFICATION_ID, notification);
Log.i("notif","Notifications sent.");
}
}
allprojects {
repositories {
...
maven { url 'https://jitpack.io' }
}
}
将以下代码添加到您项目的build.gradle文件中的dependencies中。
dependencies {
implementation 'com.github.jakebonk:NotifyMe:1.0.1'
}
NotifyMe.Builder notifyMe = new NotifyMe.Builder(getApplicationContext());
notifyMe.title(String title);
notifyMe.content(String content);
notifyMe.color(Int red,Int green,Int blue,Int alpha);//Color of notification header
notifyMe.led_color(Int red,Int green,Int blue,Int alpha);//Color of LED when
notification pops up
notifyMe.time(Calendar time);//The time to popup notification
notifyMe.delay(Int delay);//Delay in ms
notifyMe.large_icon(Int resource);//Icon resource by ID
notifyMe.rrule("FREQ=MINUTELY;INTERVAL=5;COUNT=2")//RRULE for frequency of
//notification
notifyMe.addAction(Intent intent,String text); //The action will call the intent when
//pressed
notifyMe.build();