Android, Get result from third activity

Question

In first activity, there is empty ListView and Button.

When I press button, it starts second activity that has ListView of categories.

After I click into one of listElements it will start third activity that has ListView with elements that are belong to my chosen category.

When I choose element of third ListView it must send me back to first activity, where my chosen element is added to my empty ListView

Briseno

Why don't you use fragments for such use cases? – Overtly

On some applications for iPhones, some operations are divided into steps which are switching screens and switches back to first screen to show result. – Briseno

Even fragments can be repaced – Overtly

Answer 1

Use Intent.FLAG_ACTIVITY_FORWARD_RESULT like this:

---

FirstActivity should start SecondActivity using startActivityForResult().

SecondActivity should start ThirdActivity using this:

Intent intent = new Intent(this, ThirdActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);
startActivity(intent);
finish();

This tells ThirdActivity that it should return a result to FirstActivity.

ThirdActivity should return the result using

setResult(RESULT_OK, data);
finish();

At that point, FirstActivity.onActivityResult() will be called with the data returned from ThirdActivity.

Plattdeutsch

This is working solution – Hebraism

Answer 2

Though I'd implore you to change your architecture design, it is possible to do it like this:

File ActivityOne.java

...
startActivityForResult(new Intent(this, ActivityTwo.class), 2);
...
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(resultCode == RESULT_OK && data != null) {
        //Collect extras from the 'data' object
    }
}
...

File ActivityTwo.java

...
startActivityForResult(new Intent(this, ActivityTwo.class), 3);
...
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(resultCode == RESULT_OK && data != null) {
        setResult(resultCode, data);
        finish();
    }
    setResult(RESULT_CANCELLED);
}
...

File ActivityThree.java

...
//Fill the Intent resultData with the data you need in the first activity
setResult(RESULT_OK, resultData);
finish();
...

Longevity

Don't do this. It implies noticeable side effects i.e. blinking. – Woosley