I have an activity with recycler view adapter class, when button clicked in adapter class I want to refresh the main activity

Question

I have an activity with RecyclerView.Adapter class. RecyclerView contains button. When click that button I want to change a value defined in main activity and display it in TextView that also defined in main activity , otherwise I want to refresh the activity.

I already tried some code like:

use startActivityResult and got result on onActivityResult in mainActivity — Mohit Suthar, Jul 24 '17 at 05:49
I suppose something wrong with your design. In most cases you MUST NOT recreate Activity by yourself. Could you clarify for what purposes do you need this? — Andrii Lisun, Jul 24 '17 at 05:51
send a instance of the activity into adapter class. write a public method in the activity class. in that method change a value in textview or refresh your activity which clicking on button. — Sai's Stack, Jul 24 '17 at 05:54
I'm a beginner in this field so can you please elaborate your answer? — Arun Rappai C, Jul 24 '17 at 05:57
@alisun i defined a textview in my activity... by using a method i set a value in that textview..when button clicked in adapter class i want to change the textview data — Arun Rappai C, Jul 24 '17 at 05:59
try Intent and call in onclicklistner or you can implement button in main activity — jigar savaliya, Jul 24 '17 at 06:38
@jigarsavaliya by using intent the activity finish and come up...that works startActivity(new Intent(getApplicationContext(), NextActivity.class)); finish(); but i need to know that another method i have more buttons ... so when button clicked each time i want to do this — Arun Rappai C, Jul 24 '17 at 06:42
@Arun Rappai C make static method in mainActivity where changes take place and call it in listner — jigar savaliya, Jul 24 '17 at 06:50

Andrii Lisun · Answer 1 · 2017-07-24T07:25:23.617

0

You don't need to recreate Activity in this case. The best solution would be:

Declare an interface.
Implement it in Activity(here implement your updates to TextView, etc.).
Pass object that implements the interface to your adapter.
Call the method on this interface in adapter.

Here is example: https://stackoverflow.com/a/32720879/2528967

edited Jul 24 '17 at 07:25

answered Jul 24 '17 at 06:13

Andrii Lisun

653
4
22

score 0 · Answer 2 · answered Jul 24 '17 at 06:41

YourActivity extends Activity implements YourAdapter.ClickCallback{

@override
oncreate(Bundle bundle){
 // initialize views 
 YourAdapter adapter = new YourAdapter(this);
 // do something with your adapter
}

@Override
public void updateView(){
//update your views here
}   

}

//In Recycler Adapter pass ClickCallBack As parameter
class YourAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

 private ClickCallBack clickCallBack;

 public YourAdapter(ClickCallBack clickCallBack){
 this.clickCallBack=clickCallBack;
 }

 //ClickCallback Interface
interface ClickCallBack {
 void updateView();
}

 //In your ButtonClick
  clickCallBack.updateView();

}

You can also add parameters in updateView method.

score 0 · Answer 3 · answered Jul 24 '17 at 06:51

0

Pass an instance of those TextView through constructor and update the value there in the Adaptor. That would be the easiest way.

answered Jul 24 '17 at 06:51

Ashutosh Sagar

981
8
20

I have an activity with recycler view adapter class, when button clicked in adapter class I want to refresh the main activity

3 Answers3