Android Toolbar Home Button

android_toolbar_home.java

# To add navigation back to the main activity using the 
# Toolbar (material design), we do three things:

# 1. Declare the parent activity in the AndroidManifest.xml
#
#    <activity android:name=".MySubActivity" android:label="@string/title_sub_activity" >
#       <meta-data android:name="android.support.PARENT_ACTIVITY" android:value=".MainActivity" />
#    </activity>

# 2. Configure the Toolbar in MySubActivity:

    @Override
    protected void onCreate(Bundle savedInstanceState) {

        # add this to display the back arrow icon 
        getSupportActionBar().setHomeButtonEnabled(true);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    }

# 3. Handle the selection event in MySubActivity:

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        # other stuff ...

        if (id == android.R.id.home) {
            NavUtils.navigateUpFromSameTask(this);
        }
    }