找不到栏图标的侦听器

Question

I'm working on an app that, thought the method setHomeAsUpIndicator , replaces the title of the activity. So far everything makes sense because it can be understood by reading the documentation , but I can't figure out why, when I press the icon, a certain Activity is launched. This specific part of the code looks like this:

private void myMethod() {
  actionBar.setDisplayHomeAsUpEnabled(true);
  actionBar.setHomeAsUpIndicator(
    ContextCompat.getDrawable(this, R.drawable.someIcon)
  );
  actionBar.setHomeActionContentDescription(
    getResources().getString(R.string.correspondingDescription)
  );
  actionBar.setDisplayShowTitleEnabled(false);
}

When someIcon is pressed, another Activity is launched, but I don't know where is that indicated.

Thanks for the help!

Answer 1

It moves to previous activity because there is a parent activity set in a AndroidManifest.xml file, like this :

    <activity
        android:name=".ExampleActivity"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value=".MainActivity"/>
    </activity>