Call Activity method from adapter

Question

Is it possible to call mathod that is defined in Activity from ListAdapter?

(I want to make a Button in list's row and when this button is clicked it should perform the method, that is defined in current Activity. I tried to set onClickListener in my ListAdapter but I don't know how to call this method, what's its path...)

when I used Activity.this.method() I get the following error:

No enclosing instance of the type Activity is accessible in scope

Any Idea ?

you cannot call activity.this in some other class unless it is a inner class to that activity. follow @Eldhose M Babu solution for your case — Aug 27 '12 at 13:03

Eldhose M Babu 3,057 1 10 30 · Accepted Answer · Aug 27 '12 at 13:00

up vote 26 down vote accepted

Yes you can.

In the adapter:

Add a new Field : private Context mContext;

In the adapter Constructor add the following code :

public AdapterName(......,Context context){ ...your code. this.mContext=context; }

In the getView(...) of Adapter :

Button btn=(Button)convertView.findViewById(yourButtonId); btn.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { ((YourActivityName)mContext).yourDesiredMethod(); } });

replace with your own class names where you see your code, your activity etc.

answered Aug 27 '12 at 13:00

Eldhose M Babu
3,057 1 10 30

Yes I can! ...now :D thx – user1602687 Aug 27 '12 at 13:22

Awesome man!! Thanks a lot!!!! :) – nithinreddy Mar 7 '13 at 12:08

this not working when i call from the outer class adapter – Issac Balaji Sep 24 at 8:26

I have similar problem. in my case, it is Fragment what should i use instead of((YourActivityName)mContext).yourDesiredMethod(); – Jeeten Parmar Oct 15 at 9:10

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Mighter 4,905 6 42 93 · Answer 2 · Aug 27 '12 at 13:02

up vote 29 down vote

You can do it this way:

Declare interface:

public interface MyInterface{ public void foo(); }

Let your Activity imlement it:

 public class MyActivity extends Activity implements MyInterface{ public void foo(){ //do stuff } }

Then pass your activity to ListAdater:

public MyAdapter extends BaseAdater{ private MyInterface listener; public MyAdapter(MyInterface listener){ this.listener = listener; } }

And somewhere in adapter, when you need to call that Activity method:

listener.foo();

answered Aug 27 '12 at 13:02

Mighter
4,905 6 42 93

4

This is best practice!! – Lisa Anne Mar 3 '13 at 16:49

1

Like this one better. – goodm Mar 18 '13 at 12:12

1

I first thought of the method above as you would with fragments but this is the best solution! – brux Aug 2 '13 at 0:55

1

thank you , best practice! – daimajia Sep 9 '13 at 7:51

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Answer 3

总结：（1）第一种方案是将activity传递过去；

Answer 4

（2）第二中方案是写一个接口，acitivity中实现这个接口，传递给adapter进行调用。

Adapter中调用Activity中的方法

Call Activity method from adapter

2 Answers

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