Java 在 onPostExecute 中的 notify() 之前线程未锁定对象
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Object not locked by thread before notify() in onPostExecute
提问by Erkan Erol
I try to notify adapters of listviews of main class in onPostExecute but I receive the error: java.lang.IllegalMonitorStateException:object not locked by thread before notify()
我尝试在 onPostExecute 中通知适配器主类的列表视图，但收到错误：java.lang.IllegalMonitorStateException：notify() 之前线程未锁定对象
@Override
protected void onPostExecute(String result) {
popularfragment.adapter.notifyDataSetChanged();
recentfragment.adapter.notifyDataSetChanged();
}
采纳答案by Rudi Kershaw
The .notify()method has to be called from within a synchronizedcontext, ie from inside a synchronizedblock.
该.notify()方法必须从synchronized上下文中调用，即从synchronized块内部调用。
The java.lang.IllegalMonitorStateExceptionis thrown when you call .notify()on an object that is not used as the lock for the synchronized block in which you call notify. For example, the following works;
java.lang.IllegalMonitorStateException当您调用.notify()未用作您调用通知的同步块的锁的对象时，将抛出。例如，以下作品；
synchronized(obj){
obj.notify();
}
But this will throw the exception;
但这会抛出异常；
synchronized(obj){
// notify() is being called here when the thread and
// synchronized block does not own the lock on the object.
anotherObj.notify();
}
Reference;
参考;
回答by Martin Pfeffer
I had the same error, but (for me) the answer suggested by Rudi Kershaw wasn't the issue... I called the notify()of a Notification the wrong way (see the last lineof both snippets):
我有同样的错误，但（对我而言）鲁迪·克肖建议的答案不是问题......我notify()以错误的方式调用了通知（参见两个片段的最后一行）：
Not working:
不工作：
public void update() {
mBuilder.setSmallIcon(R.drawable.ic_launcher)
.setPriority(AesPrefs.getInt(R.string.PRIORITY_NOTIFICATION_BATTERY, NotificationCompat.PRIORITY_MAX))
.setOngoing(true);
mBuilder.setWhen(AesPrefs.getLong(Loader.gStr(R.string.LAST_FIRED_BATTERY_NOTIFICATION) + Const.START_CLIPBOARD_NOTIFICATION_DELAYED, -1));
mManager.notify(); // <- lil' mistake
}
Working:
在职的：
public void update() {
mBuilder.setSmallIcon(R.drawable.ic_launcher)
.setPriority(AesPrefs.getInt(R.string.PRIORITY_NOTIFICATION_BATTERY, NotificationCompat.PRIORITY_MAX))
.setOngoing(true);
mBuilder.setWhen(AesPrefs.getLong(Loader.gStr(R.string.LAST_FIRED_BATTERY_NOTIFICATION) + Const.START_CLIPBOARD_NOTIFICATION_DELAYED, -1));
mManager.notify(Const.NOTIFICATION_CLIPBOARD, mBuilder.build()); // <- ok ;-)
}
