Btukfyl

Add

actionBar.setHomeButtonEnabled(true);

and then add the following

@Override

public boolean onOptionsItemSelected(MenuItem menuItem)

{       

    switch (menuItem.getItemId()) {

        case android.R.id.home:

            onBackPressed();

            return true;

        default:

            return super.onOptionsItemSelected(menuItem);

    }

}

As suggested by naXa I've added a check on the itemId, to have it work correctly in case there are multiple buttons on the action bar.

this one worked for me:

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_your_activity);

    getSupportActionBar().setDisplayHomeAsUpEnabled(true);

    // ... other stuff

}



@Override

public boolean onSupportNavigateUp(){

    finish();

    return true;

}

The method onSupportNavigateUp() is called when you use the back button in the SupportActionBar.

After setting

 actionBar.setHomeButtonEnabled(true);

You have to configure the parent activity in your AndroidManifest.xml

<activity

    android:name="com.example.MainActivity"

    android:label="@string/app_name"

    android:theme="@style/Theme.AppCompat" />

<activity

    android:name="com.example.SecondActivity"

    android:theme="@style/Theme.AppCompat" >

    <meta-data

        android:name="android.support.PARENT_ACTIVITY"

        android:value="com.example.MainActivity" />

</activity>

Look here for more information http://developer.android.com/training/implementing-navigation/ancestral.html

There are two ways to approach this.

Option 1: Update the Android Manifest
If the settings Activity is always called from the same activity, you can make the relationship in the Android Manifest. Android will automagically show the 'back' button in the ActionBar

<activity

    android:name=".SettingsActivity"

    android:label="Setting Activity">

    <meta-data

        android:name="android.support.PARENT_ACTIVITY"

        android:value="com.example.example.MainActivity" />

</activity>

Option 2: Change a setting for the ActionBar
If you don't know which Activity will call the Settings Activity, you can create it like this. First in your activity that extends ActionBarActivity (Make sure your @imports match the level of compatibility you are looking for).

@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_settings_test);

    ActionBar actionBar = getSupportActionBar();

    actionBar.setHomeButtonEnabled(true);

    actionBar.setDisplayHomeAsUpEnabled(true);

}

Then, detect the 'back button' press and tell Android to close the currently open Activity.

@Override

public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {

        case android.R.id.home:

            // app icon in action bar clicked; goto parent activity.

            this.finish();

            return true;

        default:

            return super.onOptionsItemSelected(item);

    }

}

That should do it!

You'll need to check menuItem.getItemId() against android.R.id.home in the onOptionsItemSelected method

Duplicate of Android Sherlock ActionBar Up button

Simpler and better:
For API >= 16

Simply add "parentActivityName" for each activity in Manifest. The back button will automatically take u to the parent activity.

<activity

        android:name="com.example.myfirstapp.DisplayMessageActivity"

        android:label="@string/title_activity_display_message"

        android:parentActivityName="com.example.myfirstapp.MainActivity" >

Use this to show back button and move to previous activity,

final ActionBar actionBar = getSupportActionBar();

        assert actionBar != null;

        actionBar.setDisplayHomeAsUpEnabled(true);

        actionBar.setHomeAsUpIndicator(R.drawable.back_dark);





@Override

    public boolean onOptionsItemSelected(final MenuItem item) {



        switch (item.getItemId()) {

            case android.R.id.home:

                onBackPressed();

                return true;

            default:

                return super.onOptionsItemSelected(item);

        }

    }

Firstly Use this:

ActionBar bar = getSupportActionBar();

bar.setDisplayHomeAsUpEnabled(true);

Then set operation of button click in onOptionsItemSelected method

 @Override

 public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {

        case android.R.id.home:

         finish();

        return true;

     default:

        return super.onOptionsItemSelected(item);

  }

 }

if anyone else need the solution

@Override

public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();



    if (id == android.R.id.home) {

        onBackPressed();

    }



    return super.onOptionsItemSelected(item);

}

Add this line in onCreate() method

getSupportActionBar().setDisplayHomeAsUpEnabled(true);

then Override this method

 @Override

    public boolean onSupportNavigateUp(){

        finish();

        return true;

    }