How to change home as up resource programmatically?

Question

I know how to change the homeAsUpIndicator in the styles xml file. The question is how to change it programmatically.

The reason I want to do it because in some views I support side navigation (sliding menu) - pressing the up/back title button, shows the side menu.

In other views I support the natural up/back botton.

Thus I would like to different indicator icons to indicate the two different logics - side navigation vs. up/back.

Please, lets not argue on the motivation of doing this. That's the given state. Thanks.

Answer 1

int upId = Resources.getSystem().getIdentifier("up", "id", "android");
if (upId > 0) {
    ImageView up = (ImageView) findViewById(upId);
    up.setImageResource(R.drawable.ic_drawer_indicator);
}

Answer 2

The solution by @matthias doesn't work on all devices, A better solution to change the homeAsUpIndicator is to set it @null in style and change the logo resource programmatically.

Below is my code from style.xml

<style name="Theme.HomeScreen" parent="AppBaseTheme">
  <item name="displayOptions">showHome|useLogo</item>
  <item name="homeAsUpIndicator">@null</item>
  <item name="android:homeAsUpIndicator">@null</item>
</style>

In code you can change the logo using setLogo() method.

getSupportActionBar().setLogo(R.drawable.abc_ic_ab_back_holo_light); //for ActionBarCompat
getActionBar().setLogo(R.drawable.abc_ic_ab_back_holo_light); //for default actionbar for post 3.0 devices

Also note that the Android API 18 has methods to edit the homeAsUpIndicator programatically, refer documentation.