Question

I am trying to tidy up my code so that I can easily reuse elements without having to duplicate work/ code.

I have a contactpicker and code to process the result in my application that I want to put into its own external class so I can reuse it in multiple areas.

I have got stuck on one issue- in order to call the StartActivityforResult, I need to pass the activity to the external class- however I am not sure how to do that?

Here is the class I am using as the external contact picker:

    public class ContactFinder {

    private static final int CONTACT_PICKER_RESULT = 1001;
    private Activity atv;
    public ContactFinder(Activity atv) {
        this.atv=atv;
    }
public void startContactPicker()
{
    Intent contactPickerIntent=new Intent(Intent.ACTION_PICK,ContactsContract.CommonDataKinds.Phone.CONTENT_URI);
    //Shows CONTACT_PICKER_RESULT cannot be resolved to a variable
    atv.startActivityForResult(contactPickerIntent, CONTACT_PICKER_RESULT);

}
}

so how would I call it from my main activity using the following:

ContactFinder cf=new ContactFinder(???));// how do I pass the activity to this external class

cf.startContactPicker();

Answer 1

Pass this as Activity in which you are creating this Object.

ContactFinder cf=new ContactFinder(this);
cf.startContactPicker();

Keep in mind to implement onActivityResult() in your Activity also, to handle the result given by the started Activity.

Better to have a basic Activity class to which will implement onActivityResult() for your ContactFinder and extend every Activity (in which you want to use ContactFinder) from basic Actvitiy