我已成功创建状态栏通知，但我希望它在用户退出应用后6小时弹出。
我有以下代码：
public class myClass extends superClass implements myinterface {
final int NOTIF_ID = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {.........}
/* more methods etc */ ......
@Override
protected void onDestroy() {
View iop = (View) findViewById(R.id.app);
sendNotification(iop);
super.onDestroy();
}
public void sendNotification(View view) {
// Use NotificationCompat.Builder to set up our notification.
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
//icon appears in device notification bar and right hand corner of notification
builder.setSmallIcon(R.drawable.ic_launcher);
// This intent is fired when notification is clicked
Intent intent = new Intent(view.getContext(), AndroidLauncher.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
// Set the intent that will fire when the user taps the notification.
builder.setContentIntent(pendingIntent);
// Large icon appears on the left of the notification
builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher));
// Content title, which appears in large type at the top of the notification
builder.setContentTitle("Notifications Title");
// Content text, which appears in smaller text below the title
builder.setContentText("Your notification content here.");
// The subtext, which appears under the text on newer devices.
// This will show-up in the devices with Android 4.2 and above only
builder.setSubText("Tap to view documentation about notifications.");
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
// Will display the notification in the notification bar
notificationManager.notify(NOTIF_ID, builder.build());
}
退出应用程序时会弹出状态栏通知，但我希望自用户退出应用程序后6小时后弹出状态栏通知。我该怎么做呢？
提前致谢！
答案 0 :(得分：2)
您可以使用AlarmManager来安排包含通知的广播。
private void scheduleNotification() {
NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
builder.setContentTitle("Scheduled Notification");
builder.setContentText(content);
builder.setSmallIcon(R.drawable.ic_launcher);]
Notification notification = builder.build();
Intent notificationIntent = new Intent(this, NotificationPublisher.class);
notificationIntent.putExtra(NotificationPublisher.NOTIFICATION_ID, 1);
notificationIntent.putExtra(NotificationPublisher.NOTIFICATION, notification);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
long futureInMillis = System.currentTimeMillis() + TimeUnit.HOURS.toMillis(6);
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, futureInMillis, pendingIntent);
}
然后使用BroadcastReceiver接收意图并显示通知。
public class NotificationPublisher extends BroadcastReceiver {
public static String NOTIFICATION_ID = "notification-id";
public static String NOTIFICATION = "notification";
public void onReceive(Context context, Intent intent) {
NotificationManager notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notification = intent.getParcelableExtra(NOTIFICATION);
int id = intent.getIntExtra(NOTIFICATION_ID, 0);
notificationManager.notify(id, notification);
}
}
不要忘记在AndroidManifest.xml文件中注册接收器。
答案 1 :(得分：2)
创建一个新类，它将使用待定意图和警报管理器执行警报。
long time= 6*60*60*1000; //6 hours
new Alarm_task(this, time).run();
public class Alarm_task implements Runnable{
// The android system alarm manager
private final AlarmManager am;
// Your context to retrieve the alarm manager from
private final Context context;
long alarm_time;
public Alarm_task(Context context, long time) {
this.context = context;
this.am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
this.alarm_time = time;
}
@Override
public void run() {
// Request to start are service when the alarm date is upon us
//pop up a notification into the system bar not a full activity
Intent i = new Intent("intent name");
// can create a dialog in that intent or just call the sendNotification() function
/** Creating a Pending Intent */
PendingIntent operation = PendingIntent.getActivity(getBaseContext(), 0, i, Intent.FLAG_ACTIVITY_NEW_TASK);
/** Setting an alarm, which invokes the operation at alart_time */
alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP,SystemClock.elapsedRealtime() + alarm_time, operation);
}
}
在清单文件中定义意图：
<activity
android:name=".Activity name"
android:label="@string/app_name" >
<intent-filter>
<action android:name="Intent name" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
现在在该活动中你可以在onCreate（）期间调用Sendnotification（）函数..或根据你的应用程序显示一些UI
答案 2 :(得分：1)
从onDestroy
public void Remind (String title, String message)
{
AlarmManager alarmManager = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
Intent notificationIntent = new Intent("android.media.action.DISPLAY_NOTIFICATION");
notificationIntent .PutExtra ("message", message);
notificationIntent .PutExtra ("title", title);
notificationIntent.addCategory("android.intent.category.DEFAULT");
PendingIntent broadcast = PendingIntent.getBroadcast(context, 0 , notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT);
Calendar cal = Calendar.getInstance();
if (android.os.Build.VERSION.SDK_INT>16)
{
alarmManager.setExact(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis()+ 6*60*60*1000, broadcast);
}else
{
alarmManager.set(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis() + 6*60*60*1000, broadcast);
}
}
创建一个新的JAVA文件
public class Broadcast extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent1) {
String message = intent1.getStringExtra ("message");
String title = intent1.getStringExtra ("title");
// This intent is fired when notification is clicked
Intent notificationIntent = new Intent(context, AndroidLauncher.class);
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
stackBuilder.addParentStack(AndroidLauncher.class);
stackBuilder.addNextIntent(notificationIntent);
PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
// Use NotificationCompat.Builder to set up our notification.
NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
//icon appears in device notification bar and right hand corner of notification
builder.setSmallIcon(R.mipmap.ic_launcher);
// Set the intent that will fire when the user taps the notification.
builder.setContentIntent(pendingIntent);
// Content title, which appears in large type at the top of the notification
builder.setContentTitle("Notifications Title");
// Content text, which appears in smaller text below the title
builder.setContentText("Your notification content here.");
// The subtext, which appears under the text on newer devices.
// This will show-up in the devices with Android 4.2 and above only
builder.setSubText("Tap to view documentation about notifications.");
NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
// Will display the notification in the notification bar
notificationManager.notify(0, builder.build());
}
在Manifest中注册此Receiver
<receiver android:name=".Broadcast">
<intent-filter>
<action android:name="android.media.action.DISPLAY_NOTIFICATION" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
答案 3 :(得分：0)
您可以使用警报管理器服务和通知管理器来完成此操作。