Android public static internal class broadcastreceiver

Android public static internal class broadcastreceiver

The first time I wrote a blog, I hope you can correct it.

When you want to implement the broadcast receiving function, Because Java is a single inheritance, generally one class will be extends activity, so you will think of the internal class extends broadcastreceiver, which may encounter two exceptions.

1: Java. Lang. runtimeexception: Unable to instantiate
Receiver com. example. progressbar. progressbaractivity $ mbroadcastreceiver:
Java. Lang. instantiationexception: COM. example. progressbar. progressbaractivity $ mbroadcastreceiver

This is because the internal class needs to be written as static, that is, static

StaticClass mbroadcastreceiver extends broadcastreceiver {
// Public static)

@ Override
Public void onreceive (context, intent ){
// Todo auto-generated method stub
}
}

2: Java. Lang. runtimeexception: Unable to instantiate
Receiver com. example. progressbar. progressbaractivity $ mbroadcastreceiver:
Java. Lang. illegalaccessexception: Access to class not allowed

This is because you need to write this class as public. If the default value is protected, access to class not allowed will appear.

Correct:

Public staticClass mbroadcastreceiver extends broadcastreceiver {
// Public static)
@ Override
Public void onreceive (context, intent ){
// Todo auto-generated method stub
}
}

Add $ to the internal class

<Cycler Android: Name = "com. example. progressbar. progressbaractivity$Mbroadcastreceiver ">
<Intent-filter>
<Action Android: Name = "com. example. progressbar. progressbaractivity. mbroadcastreceiver"/>
</Intent-filter>
</Cycler>

Of course, there is another way to implement its instance.

Private broadcastreceiver mbroadcastreceiver = new broadcastreceiver (){
@ Override
Public void onreceive (context, intent ){


}
};

Then register and log out.

Call registerboradcastreceiver () in oncreate () or onresume ()

Public void registerboradcastreceiver (){
Intentfilter myintentfilter = new intentfilter ();
Myintentfilter. addaction (action_name );
// Register Broadcast
Registerreceiver (mbroadcastreceiver, myintentfilter );
}

@ Override
Public void ondestroy (){
Super. ondestroy ();
Unregisterreceiver (mbroadcastreceiver );
}