9. Spinner/Drop Down list in Android App

1. Manifest 

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

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.ListView"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

2. Xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    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="wrap_content"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <ListView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/listView"
        android:visibility="gone"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Select an ID Proof"
            android:textSize="25sp"
            android:textColor="#838383"/>
    </LinearLayout>
        <Spinner
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/spinner"
            android:layout_marginTop="35dp"/>
    <AutoCompleteTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="77dp"
        android:hint="Search Here ....."
        android:id="@+id/txtAuto"/>

</LinearLayout>

3. Java

package com.example.listview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Spinner;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
Spinner spinner;
AutoCompleteTextView txtAuto;
ArrayList<String> arrSpinner = new ArrayList<>();
ArrayList<String> arrtxtAuto = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        spinner = findViewById(R.id.spinner);
        txtAuto = findViewById(R.id.txtAuto);
                //spinner arraylist
        arrSpinner.add("Licence Card");
        arrSpinner.add("Student Card");
        arrSpinner.add("Visiting Card");
        arrSpinner.add("ID Card");
        arrSpinner.add("Permit Card");

        arrtxtAuto.add("Lahore");
        arrtxtAuto.add("Faislabad");
        arrtxtAuto.add("Gujrat");
        arrtxtAuto.add("Multan");
        arrtxtAuto.add("Bahawalpur");

        ArrayAdapter<String> spinneradp = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, arrSpinner);
        spinner.setAdapter(spinneradp);

        ArrayAdapter<String> txtautoadp = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, arrtxtAuto);
        txtAuto.setAdapter(txtautoadp);
        txtAuto.setThreshold(1);
            }

}