How to setup Alertbox from BroadcastReceiver

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Although you can not show AlertDialog from Receivers because it needs ActivityContext.

You have an alternate solution to show an Activity like AlertDialog from Receiver. This is possible.

To start Activity as dialog you should set theme of activity in manifest as <activity android:theme="@android:style/Theme.Dialog" />

Style Any Activity as an Alert Dialog in Android

To start Activity from Receiver use code like

    //Intent mIntent = new Intent();
    //mIntent.setClassName("com.test", "com.test.YourActivity"); 
    Intent mIntent = new Intent(context,YourActivity.class) //Same as above two lines
    mIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(mIntent);

And one more reason behind not using AlertDialog from receiver (Even if you managed to show AlertDialog) is

A BroadcastReceiver object is only valid for the duration of the call
to onReceive(Context, Intent). Once your code returns from this
function, the system considers the object to be finished and no longer
active.

This has important repercussions to what you can do in an
onReceive(Context, Intent) implementation: anything that requires
asynchronous operation is not available, because you will need to
return from the function to handle the asynchronous operation, but at
that point the BroadcastReceiver is no longer active and thus the
system is free to kill its process before the asynchronous operation
completes.

In particular, you may not show a dialog or bind to a service from
within a BroadcastReceiver. For the former, you should instead use the
NotificationManager API. For the latter, you can use
Context.startService() to send a command to the service. More…

So the better way is ‘show notification’ and alternate way is ‘to use Activity as an Alert..’

Happy coding 🙂

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