CODEWITHSUNDEEP
android
Cheung
Cheung

Reputation: 15552

Access parent activity's method from dialog

My project have a activity named MainActivity and a BrowserActivity extend dialog service.

MainActivity will intent BrowserActivity on application started.

I would like to BrowserActivity can access MainActivity's public method.

something like that: Method on MainActivity:

public void chooseShare(Intent intent)
{
    try
    {
        startActivityForResult( intent , PICK_SHARE);
    } catch (android.content.ActivityNotFoundException ex)
    {
        Log.e("Share" , ex.getMessage());
    }

}

And i want to do on BrowserActivity : (Pseudocode)

((MainActivity)BrowserActivity.this.getOwnerActivity()).chooseShare(intent);

I try to do that:

MainActivity ma = new MainActivity();
ma.chooseShare(i);

However, it not work, it throw NULLPointerException.

Because i need startActivityForResult() instead of startActivity() for callback result.

And i digg on SOF, i found startActivityForResult() should be start on Activity, but not Dialog.

thanks you.

Upvotes: 3

Views: 6318

Answers (3)

saeid aslami
saeid aslami

Reputation: 131

you can access all classes method like this:

Context context;

public ProceedDialog(@NonNull Context context) {
    super(context);
    this.context = context;
    //do something
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
   //do something


}

@Override
public void onClick(View view) {

      ParentActivity activity = (ParentActivity)context;
      activity.method();


}

Upvotes: 1

Hyeonseo Yang
Hyeonseo Yang

Reputation: 1128

I had the same question. And I found a partial solution.

The key is that Activity is a subclass of Context.

You pass the Context paraneter to the constructor of your dialog, right?

And most people pass it by using this of MainActivity.

So, I used the following codes to get MainActivity reference.

private MainActivity getMainActivity()
{
    Context c= getContext();
    if( c instanceof MainActivity)
    {
         return (MainActivity)c;
    }
    return null;
}

Then you can call the desired method by

this.getMainActivity().chooseShare(intent);

In the dialog.

I tested this and it works!

Hope it helped you or forecomers.

(I saw the last modification date just now)

Upvotes: 0

Jon
Jon

Reputation: 1388

You should be able to use getParent() if it's within the same project.

Activity parent = getParent();
if (parent instanceof MainActivity)
    ((MainActivity)parent).chooseShare(i);

Another option would be to bind it with an ibinder and use a service or implement interfaces.

Services | Android Developers

Upvotes: 2

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