Question

android studio

Reproduce the same action as this using a ListView.

<resources>
<string-array name="pizzas">
    <item>Ham and Pineapple</item>
    <item>Supreme</item>
    <item>Seafood</item>
    <item>Italian</item>
    <item>Meat Lovers</item>
</string-array>
</resources>

Following is the layout XML File

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <Spinner
        android:id="@+id/spinner"
        android:layout_width="368dp"
        android:layout_height="wrap_content"
        tools:layout_editor_absoluteX="8dp"
        tools:layout_editor_absoluteY="42dp" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        tools:layout_editor_absoluteX="163dp"
        tools:layout_editor_absoluteY="145dp" />
</android.support.constraint.ConstraintLayout>

Following is the JAVA main File.

package com.example.wincrap.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private Spinner spinner;
    public TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        spinner = (Spinner)findViewById(R.id.spinner);
        textView = (TextView) findViewById(R.id.textView);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.pizzas, android.R.layout.simple_spinner_item);
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(
                new AdapterView.OnItemSelectedListener() {
                    @Override
                    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                        textView.setText(String.valueOf(parent.getItemAtPosition(position).toString()));
                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> parent) {

                    }
                }
        );

        setContentView(R.layout.activity_main);

    }
}

Answer 1

For the above program, following are the files

android_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.example.wincrap.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {

    private ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listView);
        ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.pizzas, android.R.layout.simple_list_item_1);
        //System.out.println(R.array.pizzas)
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(
                new AdapterView.OnItemClickListener() {
                    @Override
                    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                        Toast.makeText(MainActivity.this, parent.getItemAtPosition(position).toString(), Toast.LENGTH_LONG).show();
                    }
                }
        );


    }
}

pizzas.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="pizzas">
    <item>Ham and Pineapple</item>
    <item>Supreme</item>
    <item>Seafood</item>
    <item>Italian</item>
    <item>Meat Lovers</item>
</string-array>
</resources>

The location of the files would be the same as it was before.

Following are the ScreenShots of the running app on my phone.

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