如何在BroadcastReceiver中获取mainactivity的SharedPreferences？

Question

I am trying to make an SMS receiver class which extends broadcast receiver class. How can I get the shared preferences from the MainActivity in that SMS Receiver class. eg if I want that my program will generate autosms if the Checkbox in the UI is checked. so how can I get that information basically from the MainActivity I was thinking that it will be possible with sharedpreferences but I was unable to find any way to do this.

Answer 1

EDIT: I apologize, I misunderstood the use of a BroadcastReceiver. If I understand correctly, when a Broadcast Intent is intercepted by your BroadcastReceiver, it calls the onReceive method. Here is the function header:

public abstract void onReceive (Context context, Intent intent)

Notice that a context is passed as an argument to this function. This context is the Context in which the receiver is running. Go ahead and try using that with the methods I specified below. Here's my reference: http://developer.android.com/reference/android/content/BroadcastReceiver.html#onReceive%28android.content.Context,%20android.content.Intent%29

Hope this helps!

ORIGINAL POST: One possible way to do this is to pass the application context as a constructor argument for your SMS Receiver Class:

public SMSReceiver(Context context, ...[other args]){
    this.context = context;
    //Rest of constructor code
}

And then when you instantiate your SMS Receiver in your activity:

SMSReceiver receiver = new SMSReceiver(this, ...[other args]);

With this context, you are able to get the Shared Preferences.

Preferences preferences = context.getSharedPreferences("NAME", [int Mode]);

The user Pentium10 provided a very thorough answer regarding preference access in this link: How do I get the SharedPreferences from a PreferenceActivity in Android?

Here is the tidbit of code you'll be interested in (with a minor edit to match what I have above):

import android.preference.PreferenceManager;
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
// then you use
prefs.getBoolean("keystring", true); //or whatever method you need to retrieve your data