Android studio add button to toolbar of new activity

To add a button to the toolbar of a new activity in Android Studio, you can follow these steps:

1. Open your Android project in Android Studio and navigate to the activity where you want to add the button.

2. Open the activity_main.xml file (or the name of your activity's layout file) and add the following code inside the <LinearLayout> or <RelativeLayout> tag:

   
   <androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="?attr/colorPrimary"
    android:elevation="4dp"
    android:theme="@style/ThemeOverlay.AppCompat.ActionBar">
   
    <ImageButton
        android:id="@+id/button_toolbar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_add"
        android:tint="@color/white" />

3. In your activity's Java code, you need to inflate the layout and set the Toolbar as the action bar. Add the following code to your activity's onCreate method:

   @Override
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
   
    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
   
    // Get the button from the toolbar
    ImageButton button = findViewById(R.id.button_toolbar);
   
    // Set a listener for the button
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // Handle the button click event
        }
    });
   }

4. Run your app on a device or emulator to see the button in the toolbar.

Note: Make sure you have the androidx.appcompat:appcompat library in your project's build.gradle file and that you have imported the androidx.appcompat.widget.Toolbar class in your activity's Java code.

Also, you can use app:popupTheme attribute in the Toolbar to set the theme of the popup menu that appears when the button is clicked.

<androidx.appcompat.widget.Toolbar
   ...
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
   ...>

This will set the theme of the popup menu to a light theme. You can customize the theme to fit your app's design.