Call Activity method from adapter

Question

Is it possible to call method 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 corresponding 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 ?

Accepted Answer

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) {
    if (mContext instanceof YourActivityName) {
      ((YourActivityName)mContext).yourDesiredMethod();
    }
  }
});
```

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

If you need to use this same adapter for more than one activity then :

Create an Interface

```
public interface IMethodCaller {
    void yourDesiredMethod();
}
```

Implement this interface in activities you require to have this method calling functionality.

Then in Adapter getView(), call like:

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

You are done. If you need to use this adapter for activities which does not require this calling mechanism, the code will not execute (If check fails).

Call Activity method from adapter

Solution

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