Display Back Arrow on Toolbar

Question

I'm migrating from ActionBar to Toolbar in my application. But I don't know how to display and set click event on Back Arrow on Toolbar like I did on Actionbar.

With ActionBar, I call mActionbar.setDisplayHomeAsUpEnabled(true). But there is no the similar method like this.

Has anyone ever faced this situation and somehow found a way to solve it?

Answer 1

In your manifest file for the activity where you want to add a back button, we will use the property android:parentActivityName

        <activity
        android:name=".WebActivity"
        android:screenOrientation="portrait"
        android:parentActivityName=".MainActivity"
        />

P.S. This attribute was introduced in API Level 16.

Answer 2

If you were using AppCompatActivity and have gone down the path of not using it, because you wanted to not get the automatic ActionBar that it provides, because you want to separate out the Toolbar, because of your Material Design needs and CoordinatorLayout or AppBarLayout, then, consider this:

You can still use the AppCompatActivity, you don't need to stop using it just so that you can use a <android.support.v7.widget.Toolbar> in your xml. Just turn off the action bar style as follows:

First, derive a style from one of the NoActionBar themes that you like in your styles.xml, I used Theme.AppCompat.Light.NoActionBar like so:

<style name="SuperCoolAppBarActivity" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="colorPrimary">@color/primary</item>

    <!-- colorPrimaryDark is used for the status bar -->
    <item name="colorPrimaryDark">@color/primary_dark</item>
    ...
    ...
</style>

In your App's manifest, choose the child style theme you just defined, like so:

    <activity
        android:name=".activity.YourSuperCoolActivity"
        android:label="@string/super_cool"
        android:theme="@style/SuperCoolAppBarActivity">
    </activity>

In your Activity Xml, if the toolbar is defined like so:

...
    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        />
...

Then, and this is the important part, you set the support Action bar to the AppCompatActivity that you're extending, so that the toolbar in your xml, becomes the action bar. I feel that this is a better way, because you can simply do the many things that ActionBar allows, like menus, automatic activity title, item selection handling, etc. without resorting to adding custom click handlers, etc.

In your Activity's onCreate override, do the following:

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_super_cool);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);

    setSupportActionBar(toolbar);
    //Your toolbar is now an action bar and you can use it like you always do, for example:
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
} 

Answer 3

Add this to activity's xml in layout folder:

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay">
    <android.support.v7.widget.Toolbar
        android:id="@+id/prod_toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>

Make toolbar clickable, add these to onCreate method:

Toolbar toolbar = (Toolbar) findViewById(R.id.prod_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        finish();
    }
});

Answer 4

you can use the tool bar setNavigationIcon method. Android Doc

mToolBar.setNavigationIcon(R.drawable.abc_ic_ab_back_mtrl_am_alpha);

mToolBar.setNavigationOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        handleOnBackPress();
    }
});