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The title is pretty much self explanatory. What are the exact differences? I'll post sample code below.
actionbar = getSupportActionBar();
actionbar.setDisplayHomeAsUpEnabled(true);
actionbar.setDisplayShowHomeEnabled(true);
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The documentation is pretty much self explanatory.
ActionBar.setDisplayShowHomeEnabled()specifies whether or not the Home button is shown.ActionBar.setDisplayHomeAsUpEnabled()specifies whether or not the Home button has the arrow used for Up Navigation next to it.