Get Context in a Service

问题

Is there any reliable way to get a Context from a Service?

I want to register a broadcast receiver for ACTION_PHONE_STATE_CHANGED but I don't need my app to always get this information, so I don't put it in the Manifest.

However, I can't have the broadcast receiver be killed by the GC when I need this information so I'm registering the broadcast receiver in a Service.

Hence, I need a Context to to call registerReceiver(). When I no longer need the ACTION_PHONE_STATE_CHANGED I unregister it.

Any tips?

回答1:

Service is a Context

回答2:

Service extends ContextWrapper which extends Context. Hence the Service is a Context. Use 'this' keyword in the service.

回答3:

1. Service extends ContextWrapper
2. ContextWrapper extends Context

So....

Context context = this;

(in Service or Activity Class)

回答4:

Since Service is a Context, the variable context must be this:

DataBaseManager dbm = Utils.getDataManager(this);   

回答5:

As Service is already a Context itself

you can even get it through:

Context mContext = this;

OR

Context mContext = [class name].this;  //[] only specify the class name
// mContext = JobServiceSchedule.this; 

来源：https://stackoverflow.com/questions/6446221/get-context-in-a-service