There are several blogs and articles about implementing back navigation in Android. Yet a beginner would need to read a lot to figure out how to do it. Let me show you how to do it in 2 mints.
It is pretty easy. Just follow the steps as below.
Add Parent Activity in AndroidManifest.xml
Add the following to your child-activity and declare the parent-activity
android:parentActivityName="<<ParentClassName>>"
For users who are using 4.0.0 or lower versions, add the following meta-data code in the child-activity
<meta-data android:name="android.support.PARENT_ACTIVITY" android:value="org.slappforge.findyourmate.HotPlacesActivity" />
An example of the child-activity would look like below,
<activity android:name=".ViewProfileActivity" android:label="@string/title_activity_view_profile" android:theme="@style/AppTheme.NoActionBar" android:parentActivityName=".PlacesActivity"> <!-- Parent activity meta-data to support 4.0 and lower --> <meta-data android:name="android.support.PARENT_ACTIVITY" android:value="com.example.example.PlacesActivity" /> </activity>
Add a toolbar to your layout XML
Add a toolbar to your layout resource XML as below,
<android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_collapseMode="pin" app:popupTheme="@style/AppTheme.PopupOverlay" />
Setting up the Activity
Go to your Activity class and in OnCreate()
add the following code,
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); toolbar.setTitle(username); setSupportActionBar(toolbar);
// Get a support ActionBar corresponding to this toolbar ActionBar ab = getSupportActionBar(); // Enable the Up button if (ab != null) { ab.setDisplayHomeAsUpEnabled(true); } else { throw new NullPointerException("Something went wrong"); }
Make sure that you have not called finish()
in your parent-activity class when starting the child-activity.
Your Back Navigation is working fine now!!!
