如何在更改按钮时避免闪烁通知更新
如何在更改按钮时避免闪烁通知更新
提问于 2013-09-26 17:55:24
我有一个通知，它支持播放，暂停前进和后退。
private static Notification createNotification(String interpret, String title, boolean paused) {
// if (builder == null)
builder = new NotificationCompat.Builder(context);
builder.setPriority(Notification.PRIORITY_MAX);
builder.setAutoCancel(false);
builder.setContentTitle(title);
builder.setContentText(interpret);
builder.setOngoing(true);
builder.setOnlyAlertOnce(true);
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setContentIntent(PendingIntent.getActivity(context, 9, new Intent(context, ApplicationActivity.class), Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT));
builder.addAction(R.drawable.av_previous, "", PendingIntent.getBroadcast(context.getApplicationContext(), 0, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.PREVIOUS), PendingIntent.FLAG_CANCEL_CURRENT));
if (paused)
builder.addAction(R.drawable.av_play, "", PendingIntent.getBroadcast(context.getApplicationContext(), 2, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.PLAY), PendingIntent.FLAG_CANCEL_CURRENT));
else
builder.addAction(R.drawable.av_pause, "", PendingIntent.getBroadcast(context.getApplicationContext(), 3, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.PAUSE), PendingIntent.FLAG_CANCEL_CURRENT));
builder.addAction(R.drawable.av_next, "", PendingIntent.getBroadcast(context.getApplicationContext(), 1, new Intent(NotificationPlayerControlReceiver.MUSIC_PLAYER_INTENT).putExtra("resultcode", NotificationPlayerControlReceiver.NEXT), PendingIntent.FLAG_CANCEL_CURRENT));
Notification notification = builder.build();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
notification.tickerView = null;
return notification;
}更新通知：
public static void update(String interpret, String title, boolean paused) {
NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
manager.notify(0, createNotification(interpret, title, paused));
}为了避免在更新时闪烁，我将构建器设置为一个全局变量，并在每次更新时重用它，这很有效。但是重用它，意味着我添加的所有按钮都会被重用，并且不可能删除我之前添加的操作。
只有当我在每次更新时重新初始化NotificationCompat.Builder时，按钮更改才有效，这意味着我再次闪烁。
我如何避免闪烁，但让按钮改变？
编辑:刚刚检查了Rocket Player，他们没有解决这个问题，但是Google Play Music解决了这个问题
回答 2
Stack Overflow用户
发布于 2014-11-22 04:09:01
正如Boris所说，问题是每次更新都会生成一个新的通知。我的解决方案涵盖了相同的逻辑，但我使用NotificationBuilder...
代码如下：
if (mNotificationBuilder == null) {
mNotificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(iconId)
.setContentTitle(title)
.setContentText(message)
.setLargeIcon(largeIcon)
.setOngoing(true)
.setAutoCancel(false);
} else {
mNotificationBuilder.setContentTitle(title)
.setContentText(message);
}请记住，mNotificationBuilder是类中的私有字段。
Stack Overflow用户
发布于 2015-05-02 21:40:56
我知道这是一个相当古老的问题，但由于我在其他地方找不到解决方案，我认为现在回答这个问题可能会对其他有同样问题的人有所帮助。
这个问题一开始就有点棘手。我今天也遇到了这个问题，作为一个固执的自己，我在寻找和尝试了一段时间后，找到了一个解决方案。
如何解决这个问题：
为了与低于19级的API兼容，我的解决方案是使用支持库中的NotificationCompat类。
正如其他人所建议的那样，只要需要通知，我就会保留对NotificationCompat.Builder的引用。我在通知中使用的操作仅在初始创建Builder时添加，这些操作将根据情况而更改，我也会将其存储在服务的私有成员中。更改后，我重用Builder对象，并根据需要调整NotificationCompat.Action对象。然后，我根据API级别调用Builder.getNotification()或Builder.build()方法(由于support-libs的原因，可能不是必需的，但我没有检查这一点。如果我可以省略这一点，请写一条评论，这样我就可以改进我的代码;)
下面是我刚才描述的示例代码：
public Notification createForegroundNotification(TaskProgressBean taskProgressBean, boolean indeterminate) {
Context context = RewardCalculatorApplication.getInstance();
long maxTime = TaskUtils.getMaxTime(taskEntry);
long taskElapsedTime = TaskUtils.calculateActualElapsedTime(taskProgressBean);
long pauseElapsedTime = taskProgressBean.getPauseElapsedTime();
int pauseToggleActionIcon;
int pauseToggleActionText;
PendingIntent pauseToggleActionPI;
boolean pauseButton = pauseElapsedTime == 0;
if(pauseButton) {
pauseToggleActionIcon = R.drawable.ic_stat_av_pause;
pauseToggleActionText = R.string.btnTaskPause;
pauseToggleActionPI = getPendingIntentServicePause(context);
} else {
pauseToggleActionIcon = R.drawable.ic_stat_av_play_arrow;
pauseToggleActionText = R.string.btnTaskContinue;
pauseToggleActionPI = getPendingIntentServiceUnpause(context);
}
String contentText = context.getString(R.string.taskForegroundNotificationText,
TaskUtils.formatTimeForDisplay(taskElapsedTime),
TaskUtils.formatTimeForDisplay(pauseElapsedTime),
TaskUtils.formatTimeForDisplay(taskProgressBean.getPauseTotal()));
// check if we have a builder or not...
boolean createNotification = foregroundNotificationBuilder == null;
if(createNotification) { // create one
foregroundNotificationBuilder = new NotificationCompat.Builder(context);
// set the data that never changes...plus the pauseAction, because we don't change the
// pauseAction-object, only it's data...
pauseAction = new NotificationCompat.Action(pauseToggleActionIcon, getString(pauseToggleActionText), pauseToggleActionPI);
foregroundNotificationBuilder
.setContentTitle(taskEntry.getName())
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(getPendingIntentActivity(context))
.setOngoing(true)
.addAction(R.drawable.ic_stat_action_done, getString(R.string.btnTaskFinish), getPendingIntentServiceFinish(context))
.addAction(pauseAction);
}
// this changes with every update
foregroundNotificationBuilder.setContentText(contentText);
if(indeterminate) {
foregroundNotificationBuilder.setProgress(0, 0, true);
} else {
foregroundNotificationBuilder.setProgress((int) maxTime, (int) taskElapsedTime, false);
}
// if this is not the creation but the button has changed, change the pauseAction's data...
if(!createNotification && (pauseButton != foregroundNotificationPauseButton)) {
foregroundNotificationPauseButton = pauseButton;
pauseAction.icon = pauseToggleActionIcon;
pauseAction.title = getString(pauseToggleActionText);
pauseAction.actionIntent = pauseToggleActionPI;
}
return (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN)
? foregroundNotificationBuilder.getNotification() // before jelly bean...
: foregroundNotificationBuilder.build(); // since jelly bean...
}变量foregroundNotificationBuilder、pauseAction和foregroundNotificationPauseButton是服务类的私有成员。getPendingIntent...()方法是简单地创建PendingIntent对象的方便方法。
然后，当我需要使用NotificationManager更新通知时，将调用此方法，并将其移交给服务的startForeground()方法。这解决了通知中的闪烁和不可更新操作的问题。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/19025056
复制相关文章
相似问题