The action bar home-up button is on the extreme left of the Action bar. Its functionality is to navigate the app to the parent activity. Two ways can achieve the functionality:
Method 1: By adding it to the Android Manifest (AndroidManifest.xml) file.
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android:parentActivityName="<YOUR_PACKAGE>.<PARENT_ACTIVITY_NAME>" |
Add the tag in the activity’s <activity> tag of the Android Manifest file. For example, I have two activities, activity1 and activity2 and I want to go to activity1 on click of activity2’s home up button then my Android Manifest file will be like
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<activity android:name=".activity1" </activity> <activity android:name=".activity2" android:parentActivityName="com.example.myapp.activity1" > </activity> |
Method 2: By adding a check in the onOptionsItemSelected() method of the activity.
You can also implement a check on the Home up button ID in the onOptionsItemSelected() method as
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@Override public boolean onOptionsItemSelected(MenuItem item) { int id = item.getItemId(); if(id == android.R.id.home) { startActivity(new Intent(activity2.this,activity1.class); return true; } return super.onOptionsItemSelected(item); } |
Both methods work well but if you want to give the home-up button the functionality of a back press then go for the second method else you can use whatever suits you.
Official Action Bar documentation -> https://developer.android.com/reference/android/app/ActionBar
Hope this blog helps you understand and gain better navigation control and alternatives to the normal back button press in your Android application.
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This is Aaastha, signing off.
Keep coding and Keep sharing 🙂
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