即使在应用崩溃时，广播接收器如何正常工作

Question

Problem scenario: I have an android application with a statically registered broadcast receiver having intent filter registered for AIRPLANE_MODE is working fine. When I turn on the airplane mode, a toast is displayed. When I force stop my application, the broadcast receiver doesn't work which is an expected result. But now when my app crashes, still the broadcast receiver is displaying toast. So, my question is why my broadcast receiver is working even on app crash whereas it is destroyed when I force stop the application. It will be really helpful if someone could provide a clear understanding of App Force Stop scenario.

Answer 1

In your app, you have 4 points for starting your app: BroadcastReceiver , Activity , Service , ContentProvider .

So if you register your BroadcastReceiver in AndroidManifest, even if u make a force stop app, you will actually getting callbacks in BroadcastReceiver, because it's a point of starting app. You actually can disable BroadcastReceiver programatically by following code:

ComponentName component = new ComponentName(context, YourReceiver.class); 

//Disable BroadcastReceiver
context.getPackageManager().setComponentEnabledSetting(component,  PackageManager.COMPONENT_ENABLED_STATE_DISABLED , PackageManager.DONT_KILL_APP);

//Enable BroadcastReceiver
context.getPackageManager().setComponentEnabledSetting(component, PackageManager.COMPONENT_ENABLED_STATE_ENABLED , PackageManager.DONT_KILL_APP);