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How to use SearchView in the Toolbar in Kotlin?
This example demonstrates how to use SearchView in the Toolbar in Kotlin.
Step 1 − Create a new project in Android Studio, go to File ⇉ New Project and fill all required details to create a new project.
Step 2 − Add the following code to res/layout/activity_main.xml.
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout 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" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <androidx.appcompat.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="?attr/colorBackgroundFloating" android:minHeight="?attr/actionBarSize" /> <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TextView android:id="@+id/emptyView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="No Results" android:textSize="20sp" android:visibility="gone" /> </RelativeLayout>
Step 3 − Open res/strings.xml and add the following code−
<resources> <string name="app_name">Q38</string> <string-array name="months_array"> <item>January</item> <item>February</item> <item>March</item> <item>April</item> <item>May</item> <item>June</item> <item>July</item> <item>August</item> <item>September</item> <item>October</item> <item>November</item> <item>December</item> </string-array> </resources>
Step 4 − Add the following code to MainActivity.kt
import android.os.Bundle import android.view.Menu import android.widget.* import android.widget.AdapterView.OnItemClickListener import androidx.appcompat.app.AppCompatActivity import androidx.appcompat.widget.Toolbar class MainActivity : AppCompatActivity() { private lateinit var toolbar: Toolbar lateinit var adapter: ArrayAdapter<*> private lateinit var listView: ListView private lateinit var emptyView: TextView override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_main) title = "KotlinApp" toolbar = findViewById(R.id.toolbar) listView = findViewById(R.id.listView) emptyView = findViewById(R.id.emptyView) adapter = ArrayAdapter<Any?>(this, android.R.layout.simple_list_item_1, resources.getStringArray(R.array.months_array)) listView.adapter = adapter listView.onItemClickListener = OnItemClickListener { adapterView, _, i, _ -> Toast.makeText(this@MainActivity, adapterView.getItemAtPosition(i).toString(), Toast.LENGTH_SHORT).show() } listView.emptyView = emptyView } override fun onCreateOptionsMenu(menu: Menu): Boolean { menuInflater.inflate(R.menu.menu, menu) val search = menu.findItem(R.id.appSearchBar) val searchView = search.actionView as SearchView searchView.queryHint = "Search" searchView.setOnQueryTextListener(object : SearchView.OnQueryTextListener { override fun onQueryTextSubmit(query: String?): Boolean { return false } override fun onQueryTextChange(newText: String?): Boolean { adapter.filter.filter(newText) return true } }) return super.onCreateOptionsMenu(menu) } }
Step 5 − Create a Android resource folder (menu) and create a menu resource file (menu.xml) and add the following code−
<?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/appSearchBar" android:icon="@drawable/ic_search" android:title="Search" app:actionViewClass="android.widget.SearchView" app:showAsAction="ifRoom|withText" /> </menu>
Step 6 − Add the following code to androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.q36"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −
Click here to download the project code.