Android将非活动类的参数传递给活动

Question

I have this problem...

I have activity(CartActivity) that starts another activity(FindItemActivity).

In FindItemActivity there is an expandlableListView(build by custom expandalbleListAdapter) with Buttons(AddItem) with custom ActionListener(OnclickListener)

I would like to pass arguments from my actionListener to first activity(CartActivity).

Here is what i have right now(in my on click listener):

public class addOnClickListener implements OnClickListener{
Product toAdd;
Context toEnd;
public addOnClickListener(Product addable, Context context){
    this.toAdd = addable;
    this.toEnd = context;
}
@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    Intent i = new Intent(toEnd,MyCartActivity.class);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK );
    i.putExtra("Name", this.toAdd.name);
    i.putExtra("Code", String.valueOf(this.toAdd.code));
    i.putExtra("Price", String.valueOf(this.toAdd.price));
    toEnd.startActivity(i);

}
}

But, every time the button is pressed application starts NEW CartActivity, instead of the old one, that is already running... I need data stored in original activity, so I have to resume it, not to start a new one... The compiler tells me FLAG_ACTIVITY_NEW_TASK is necessary when starting an activity from non-activity class.

Is there any other flag that can be used to resume activity instead of starting a new one?

Or maybe can I close somehow activity FindItemActivity? I tried finish() but I was unable to find a way to use it in non-activity class...

Answer 1

If I rightly understand, all you want is to start another activity for choosing something and return back to your first activity.

If I am right, you must call startActivityForResult ( read more ) method in your first activity, and override onActivityResult ( read more ) method in that first activity for receiving the result from your second activity.

Before you close the second activity, in which the user must take a choice, you must populate your result intent with data you want to pass back to the first activity. ( read more )

If you define your OnCLickListener in the same file as your FindItemActivity , you can close it using this code FindItemActivity.this.finish() from OnClickListener . Otherwise you can pass link of you activity class to OnClickListener and invoke the finish method using this link.