How to create button in Action bar in android [duplicate]

In your activity class, override the following methods if they are not there by default:

// create an action bar button@Overridepublic boolean onCreateOptionsMenu(Menu menu) {    // R.menu.mymenu is a reference to an xml file named mymenu.xml which should be inside your res/menu directory.     // If you don't have res/menu, just create a directory named "menu" inside res    getMenuInflater().inflate(R.menu.mymenu, menu);    return super.onCreateOptionsMenu(menu);}// handle button activities@Overridepublic boolean onOptionsItemSelected(MenuItem item) {    int id = item.getItemId();    if (id == R.id.mybutton) {    // do something here    }    return super.onOptionsItemSelected(item);}

mymenu.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"><item    android:id="@+id/mybutton"    android:title=""    app:showAsAction="always"    android:icon="@drawable/mybuttonicon"    /></menu>

If you want to customize UI of your ActionBar, then you can use Toolbar as ActionBar. Here are the steps to do the same :

1. Add below code as a child of AppBarLayout in your activity layout xml.

   <android.support.v7.widget.Toolbar        android:id="@+id/toolbar"        android:layout_width="match_parent"        android:layout_height="?attr/actionBarSize" >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:weightSum="1">            <TextView                android:id="@+id/title"                android:layout_width="0dp"                android:layout_height="wrap_content"                android:layout_weight="1"                android:text="ActionBar Title"/>            <Button                android:layout_width="wrap_content"                android:layout_height="wrap_content" />        </LinearLayout>    </android.support.v7.widget.Toolbar>

2. Make your Toolbar as ActionBar by adding the below code in your Activity onCreate() method.

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

3. In AndroidManifest.xml, add following theme to your activity:

   android:theme="@style/AppTheme.NoActionBar"

4. In styles.xml add following code:

   <style name="AppTheme.NoActionBar">    <item name="windowActionBar">false</item>    <item name="windowNoTitle">true</item></style>

Here are the steps to get it done:

1. Create a menu in res/menu (Name it my_menu.xml)

   <menu xmlns:android="http://schemas.android.com/apk/res/android"><item    android:id="@+id/action_cart"    android:icon="@drawable/cart"    android:orderInCategory="100"    android:showAsAction="always"/> </menu>

2. Override onCreateOptionsMenu and inflate the menu

   @Overridepublic boolean onCreateOptionsMenu(Menu menu) {MenuInflater inflater = getMenuInflater();inflater.inflate(R.menu.my_menu, menu);return true;}

Visit: How to add button in ActionBar(Android)?