Add back button to action bar

Question

I have been trying to add a back button to the action bar.

I want my view to look like this:

I want to add the back button in the left of the action bar.

I added this code

ActionBar actionBar = getActionBar();

actionBar.setDisplayHomeAsUpEnabled(true);

but it doesn't work.

How can I fix this?

Answer 1

After setting actionBar.setHomeButtonEnabled(true);

Add the following code:

@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);
    }
}

Answer 2

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);
  }
 }

Answer 3

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.

Answer 4

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" >

Answer 5

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