Android - 如何从活动中包含的片段更新活动视图

Question

Concise : I am looking for a way to update a view in an activity from a fragment that the activity contains.

In detail : I have a fragment and an activity that contains the fragment. The activity has a navigation drawer and the navigation drawer contains a image view. What I am trying is to update the image view in the navigation drawer when a HTTP GET request returns a response from the fragment; the response contains a URL to where an image loader parses an image for the image view in the navigation drawer.

Given this, I am trying to get an instance of the view in the activity from the fragment, but I am not sure how to do so. Even, I am not sure if I am on the right direction...

I will greatly appreciate any input.

Regards,

Answer 1

Create Interface:

public interface mInterface{

  public void updateIMG(String url);

}

Implement this interface inside your activity and Override updateIMG() method.

Inside your fragment what ever you need to call updateIMG() just initiate interface and call a method.

mInterface listener =  (mInterface)getActivity();
listener.updateIMG(url);

Then you call this interface method it will run code inside overrided method inside activity.

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In case you get Only the original thread that created a view hierarchy can touch its views. , try .

Answer 2

将视图声明为要更新的公共视图，然后您可以从片段访问该视图并可以从那里更新

Answer 3

You can use a LocalBroadCast to send a broadcast from Fragment whenever needed and then receive the broadcast in Activity and do the changes.

You can also implement Activity , Fragment communication through an interface . Refer this link to implement the same.