How to Add Button in Actionbar(Android)

Add button in android action bar

Add toolbar inside your xml . and use NoActionBar in your activity theme .

add these toolbar in your xml on top

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#131313"
    android:minHeight="?attr/actionBarSize">

    <LinearLayout
        android:layout_width="wrap_content"
        android:background="#00aaaaaa"
        android:layout_gravity="right"
        android:layout_height="match_parent">

        <Button
            android:text="Delete"
            android:layout_width="wrap_content"
            android:background="#000"
            android:textColor="#fff"
            android:layout_height="wrap_content"
            android:textSize="16dp" />

    </LinearLayout>

</android.support.v7.widget.Toolbar>

add these theme in your activity in Menifest.xml

android:theme="@style/Theme.AppCompat.Light.NoActionBar"

and add these code in your activity ....

Toolbar topToolBar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(topToolBar);
ActionBar actionBar = getSupportActionBar();;
actionBar.setDisplayHomeAsUpEnabled(true);

Output:-

I think it is possible with the icon only .....

use this item in menu.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/delete"
        android:icon="@drawable/YourImage"
        app:showAsAction="always"></item>
</menu>

Note:- use android:icon="@drawable/YourImageWithTextDelete" put here your image .....

Add a button to the top right of action bar

You can add a button by editing/create the menu xml file:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/action_name"
        android:icon="@drawable/you_resource_here"
        android:title="Text to be seen by user"
        app:showAsAction="always"
        android:orderInCategory="0"/>

</menu>

Then in your activity, if you created a new file your need to edit onCreateOptionsMenu

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

and you can edit what the actions do in the following method:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_name) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

How to add an customized button on the actionbar?

Another quick and clean way to go about this is specifying your own layout for that menu button. something like this

<menu xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      tools:context="com.example.MainActivity">

    <item
        android:id="@+id/action_custom_button"
        android:title="Custom Button"
        android:icon="@drawable/ic_custom_button"
        app:actionLayout="@layout/layout_to_custom_button"
        app:showAsAction="always" />

</menu>

there should be

layout_to_custom_button.xml

layout file which contains the padding and style you wanted.

and also do this in your activity for the click event

@Override
public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.menu_product_detail, menu);
  final Menu mMenu = menu;
  final MenuItem item = menu.findItem(R.id.action_custom_button);
  item.getActionView().setOnClickListener(new View.OnClickListener(){

    @Override
    public void onClick(View v) {
      mMenu.performIdentifierAction(item.getItemId(), 0);
    }
   });
        return true;
}

Adding a button to the Action Bar in Android?

Try with this change:

 <menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:yourapp="http://schemas.android.com/apk/res-auto" >

    <item android:id="@+id/logout"
        android:icon="@drawable/logout"
        android:title="Logout"
        android:orderInCategory="100"
        yourapp:showAsAction="always" />
</menu>

how to use Buttons on action bar With Fragments?

You have to call setHasOptionsMenu(true) to make it work.

Do something like:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}

and then use the onCreateOptionsMenu() method with the inflater.

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    // Inflate the menu items for use in the action bar
    inflater.inflate(R.menu.search_menu, menu);
    super.onCreateOptionsMenu(menu, inflater);
}

Take a look at setHasOptionsMenu() and onCreateOptionsMenu().

Kotlin - Add action button to ActionBar

You need to override onCreateOptionsMenu function in your Activity like this:

override fun onCreateOptionsMenu(menu: Menu): Boolean {
    menuInflater.inflate(R.menu.menuTest, menu)
    return true
}

To handle click events on menu items you need to override onOptionsItemSelected:

override fun onOptionsItemSelected(item: MenuItem): Boolean = when (item.itemId) {
    R.id.action_fav -> {
        // do stuff
        true
    }
    else -> super.onOptionsItemSelected(item)
}