我正在尝试编写一个演示如何使用setVisibility()来控制Android 5.0锁屏上的Notification显示内容的示例。然而，似乎没有任何效果：
默认的
VISIBILITY_PRIVATE仍然显示私有Notification，而不是其公共对应项VISIBILITY_SECRET通知仍会出现在锁屏上
换句话说，至少在我使用一个运行着Android 5.0镜像的Nexus 7测试时，一切都表现得好像VISIBILITY_PUBLIC被强制执行一样。因此，我不知道问题是与我的代码、这个设备还是与Android中的错误相关。
我有两个版本的相同示例应用：
一个使用
NotificationCompat和NotificationManagerCompat另一个使用
Notification和NotificationManager，其中minSdkVersion为21，targetSdkVersion为21
（请注意，这些项目主要用于在Android Studio中使用；Eclipse用户可以导入这些项目，但可能需要进行一些微小的修复，特别是针对第一个示例中support-v13库的引用）
示例使用AlarmManager来触发Notification工作，主要是因为您有机会返回锁屏界面查看结果。以下是由AlarmManager触发的BroadcastReceiver（显示了NotificationCompat版本）：
/***
Copyright (c) 2014 CommonsWare, LLC
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy
of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required
by applicable law or agreed to in writing, software distributed under the
License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
OF ANY KIND, either express or implied. See the License for the specific
language governing permissions and limitations under the License.
From _The Busy Coder's Guide to Android Development_
http://commonsware.com/Android
*/
package com.commonsware.android.lollipopnotify;
import android.app.Notification;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.provider.Settings;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.NotificationManagerCompat;
public class AlarmReceiver extends BroadcastReceiver {
private static final int NOTIFY_ID=1337;
static final String EXTRA_TYPE="type";
@Override
public void onReceive(Context ctxt, Intent i) {
NotificationManagerCompat mgr=NotificationManagerCompat.from(ctxt);
switch (i.getIntExtra(EXTRA_TYPE, -1)) {
case 0:
notifyPrivate(ctxt, mgr);
break;
case 1:
notifyPublic(ctxt, mgr);
break;
case 2:
notifySecret(ctxt, mgr);
break;
case 3:
notifyHeadsUp(ctxt, mgr);
break;
}
}
private void notifyPrivate(Context ctxt, NotificationManagerCompat mgr) {
Notification pub=buildPublic(ctxt).build();
mgr.notify(NOTIFY_ID, buildNormal(ctxt).setPublicVersion(pub).build());
}
private void notifyPublic(Context ctxt, NotificationManagerCompat mgr) {
mgr.notify(NOTIFY_ID,
buildNormal(ctxt)
.setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
.build());
}
private void notifySecret(Context ctxt, NotificationManagerCompat mgr) {
mgr.notify(NOTIFY_ID,
buildNormal(ctxt)
.setVisibility(NotificationCompat.VISIBILITY_SECRET)
.build());
}
private void notifyHeadsUp(Context ctxt, NotificationManagerCompat mgr) {
mgr.notify(NOTIFY_ID,
buildNormal(ctxt)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.build());
}
private NotificationCompat.Builder buildNormal(Context ctxt) {
NotificationCompat.Builder b=new NotificationCompat.Builder(ctxt);
b.setAutoCancel(true)
.setDefaults(Notification.DEFAULT_ALL)
.setContentTitle(ctxt.getString(R.string.download_complete))
.setContentText(ctxt.getString(R.string.fun))
.setContentIntent(buildPendingIntent(ctxt, Settings.ACTION_SECURITY_SETTINGS))
.setSmallIcon(android.R.drawable.stat_sys_download_done)
.setTicker(ctxt.getString(R.string.download_complete))
.addAction(android.R.drawable.ic_media_play,
ctxt.getString(R.string.play),
buildPendingIntent(ctxt, Settings.ACTION_SETTINGS));
return(b);
}
private NotificationCompat.Builder buildPublic(Context ctxt) {
NotificationCompat.Builder b=new NotificationCompat.Builder(ctxt);
b.setAutoCancel(true)
.setDefaults(Notification.DEFAULT_ALL)
.setContentTitle(ctxt.getString(R.string.public_title))
.setContentText(ctxt.getString(R.string.public_text))
.setContentIntent(buildPendingIntent(ctxt, Settings.ACTION_SECURITY_SETTINGS))
.setSmallIcon(android.R.drawable.stat_sys_download_done)
.addAction(android.R.drawable.ic_media_play,
ctxt.getString(R.string.play),
buildPendingIntent(ctxt, Settings.ACTION_SETTINGS));
return(b);
}
private PendingIntent buildPendingIntent(Context ctxt, String action) {
Intent i=new Intent(action);
return(PendingIntent.getActivity(ctxt, 0, i, 0));
}
}
EXTRA_TYPE 的值是从活动中的 Spinner 中设置的。该逻辑似乎没问题，因为悬浮通知场景可以正常工作。并且如果我通过代码进行步进（例如，在 onReceive() 中设置断点），我可以看到它沿着正确的路径（例如，在我选择发送机密 Notification 时，在 notifySecret() 中调用 setVisibility(NotificationCompat.VISIBILITY_SECRET)）。
因此，我有点不知道为什么在 Android 5.0 锁屏界面上没有得到可见性效果。
有什么建议吗？
