How to start Activity in adapter?

I have a ListActivity with my customized adapter and inside each of the view, it may have some buttons, in which I need to implement OnClickListener. I need to implement the OnClickListener in the adapter. However, I don't know how to call the function like startActivity() or setResult(). Since the adapter doesn't extend to Activity.

So what is the best way to solve this problem?

Thanks.

Solution 1:

Just pass in the current Context to the Adapter constructor and store it as a field. Then inside the onClick you can use that context to call startActivity().

pseudo-code

public class MyAdapter extends Adapter {
     private Context context;

     public MyAdapter(Context context) {
          this.context = context;     
     }

     public View getView(...){
         View v;
         v.setOnClickListener(new OnClickListener() {
             void onClick() {
                 context.startActivity(...);
             }
         });
     }
}

Solution 2:

When implementing the onClickListener, you can use v.getContext.startActivity.

btn.setOnClickListener(new OnClickListener() {                  
    @Override
    public void onClick(View v) {
        v.getContext().startActivity(PUT_YOUR_INTENT_HERE);
    }
});

Solution 3:

public class MyAdapter extends Adapter {
     private Context context;      


     public MyAdapter(Context context) {
          this.context = context;         
     }


     public View getView(...){  
         View v;  
         v.setOnClickListener(new OnClickListener() {
             void onClick() {
                  Intent intent= new Intent(context, ToActivity.class); 
                   intent.putExtra("your_extra","your_class_value");
                 context.startActivity(intent);
             }
         });
     }
}