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ToolBar in Android with Example

A Toolbar in Android is a generalization of action bars for use within application layouts. It can be placed anywhere in your layout and provides more flexibility than the traditional action bar. This allows you to have more control over its appearance and functionality.

Here's a step-by-step guide on how to use Toolbar in Android with Kotlin:

Step 1: Add dependencies

Ensure you have the appropriate material design dependency in your build.gradle (Module: app):

implementation 'com.google.android.material:material:1.4.0'  // Ensure you have the latest version.

Step 2: Create the Toolbar layout

First, create a new layout XML file for the Toolbar, e.g., toolbar_layout.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/myToolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    app:titleTextColor="@android:color/white"
    app:popupTheme="@style/AppTheme.PopupOverlay">
</androidx.appcompat.widget.Toolbar>

Step 3: Include the Toolbar in your main layout

In your activity's layout file (activity_main.xml or equivalent):

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <include layout="@layout/toolbar_layout"/>

    <!-- The rest of your layout content -->

</LinearLayout>

Step 4: Set up the Toolbar in Kotlin code

In your MainActivity.kt:

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val toolbar: Toolbar = findViewById(R.id.myToolbar)
        setSupportActionBar(toolbar)

        // If you want to set a title:
        supportActionBar?.title = "My Toolbar Title"

        // If you want to add a back/up navigation button:
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
    }

    // If you want to handle toolbar item clicks, override this method:
    /*
    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        when (item.itemId) {
            android.R.id.home -> {
                // Handle the back/up navigation click here
                return true
            }
            // Handle other toolbar items if any
        }
        return super.onOptionsItemSelected(item)
    }
    */
}

Optional: Adding menu items to the Toolbar

Create a new menu resource file, e.g., menu_toolbar.xml in the res/menu directory:

<?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_settings"
        android:orderInCategory="100"
        android:title="@string/action_settings"
        app:showAsAction="never" />

    <!-- Add other menu items here -->

</menu>

Inflate the menu in your activity:

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

With these steps, you've set up a Toolbar for your Android app using Kotlin. Adjustments can be made for additional customization or specific use cases.

Implementing ToolBar in Android example code:

Description: Basic implementation of a ToolBar in Android.

Example Code:

<!-- In XML Layout -->
<androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary" />

Customizing ToolBar appearance in Android:

Description: Changing the appearance of the ToolBar.

Example Code (Kotlin):

val toolbar = findViewById<Toolbar>(R.id.toolbar)
toolbar.setBackgroundColor(ContextCompat.getColor(this, R.color.customColor))

Adding icons and titles to ToolBar in Android:

Description: Including icons and titles in the ToolBar.

Example Code (Kotlin):

val toolbar = findViewById<Toolbar>(R.id.toolbar)
toolbar.title = "My Toolbar"
toolbar.setLogo(R.drawable.ic_toolbar_icon)

ToolBar as the action bar in Android:
- Description: Using ToolBar as the default action bar.
- Example Code (Kotlin):
```
setSupportActionBar(toolbar)
```

Handling click events on ToolBar items in Android:

Description: Responding to click events on ToolBar items.

Example Code (Kotlin):

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    when (item.itemId) {
        R.id.action_settings -> {
            // Handle settings item click
            return true
        }
        // Add more cases as needed
        else -> return super.onOptionsItemSelected(item)
    }
}

ToolBar navigation and up button in Android:
- Description: Adding navigation and up button to the ToolBar.
- Example Code (Kotlin):
```
supportActionBar?.setDisplayHomeAsUpEnabled(true)
```
ToolBar with search functionality in Android:
- Description: Integrating search functionality in the ToolBar.
- Example Code (Kotlin):
```
val searchView = toolbar.findViewById<SearchView>(R.id.searchView)
// Customize and handle searchView events
```
Using ToolBar with AppCompatActivity in Android:
- Description: Utilizing ToolBar with AppCompatActivity.
- Example Code (Kotlin):
```
class MyActivity : AppCompatActivity() {
    // ...
}
```
Styling and theming ToolBar in Android:
- Description: Applying styles and themes to the ToolBar.
- Example Code (Kotlin):
```
toolbar.setTitleTextColor(ContextCompat.getColor(this, R.color.toolbarTextColor))
```

ToolBar and menu items in Android:

Description: Adding menu items to the ToolBar.

Example Code (Kotlin):

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

ToolBar and custom views in Android:
- Description: Incorporating custom views in the ToolBar.
- Example Code (Kotlin):
```
val customView = layoutInflater.inflate(R.layout.custom_toolbar_view, null)
toolbar.addView(customView)
```
ToolBar with Kotlin in Android:
- Description: Working with ToolBar using Kotlin.
- Example Code (Kotlin):
```
val toolbar = findViewById<Toolbar>(R.id.toolbar)
setSupportActionBar(toolbar)
```
Collapsing ToolBar layout in Android:
- Description: Creating a collapsing ToolBar layout.
- Example Code (Kotlin):
```
val collapsingToolbarLayout = findViewById<CollapsingToolbarLayout>(R.id.collapsingToolbar)
```