Error prompt: java.lang.illegalargumentexception: receiver not registered

As the name suggests, the receiver has not been registered. This is an error caused by canceling the unregistered receiver

When we use the receiver, we must ensure that the register and unregister appear in pairs

When encountering this kind of problem, you need to check the registered and de registered code in your own code to see if there is time to call unregister many times

Most of the time, I take it for granted that it will, but there may be unexpected exits in the program. For example, in my program, I register in oncreate and cancel the registration in finish. Theoretically, when I enter and exit, it should appear in pairs, but actually it reports an error! At the end of the analysis, tabactivity, groupactivity and other nested structures are used in the original layout. When exiting the current activity, the finish method is executed many times

Therefore, it is suggested that the process of receiver registration and de registration be put into onresume and onpause for two reasons

(1) These two processes are bound to occur in pairs, so the above errors can be avoided

(2) Generally, we use receiver to accept notification to change UI (except in special cases). When the activity (UI) interface is in the background, it is not necessary to accept notification to change UI

Example:

On adroid2.1 and adroid2.2 devices, if the viewflipper control is used in the activity, the following error message will occur when switching between horizontal and vertical screens

java.lang.IllegalArgumentException: Receiver not registered: android.widget. ViewFlipper$1@43dee3c0

This is because ondetachedfromwindow() is inexplicably called before onattachedtowindow(). It’s said that it’s a bug. I don’t know if it’s fixed on the latest 2.3.

The following is a very simple solution to rewrite the ondetachedfromwindow() method of viewflipper

@Override

protected void onDetachedFromWindow () {

try {

super.onDetachedFromWindow();

}

catch (IllegalArgumentExceptione) {

stopFlipping();

}

}