phone dailer app in android studio (java & xml)

mainactivity.java

Main Activity



package com.example.phonedailer;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private EditText phoneNumber;
    private Spinner callTypeSpinner;
    private Button callButton, saveButton;
    private String selectedCallType;

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

        phoneNumber = findViewById(R.id.phoneNumber);
        callTypeSpinner = findViewById(R.id.callTypeSpinner);
        callButton = findViewById(R.id.callButton);
        saveButton = findViewById(R.id.saveButton);

        // Populate spinner with call types
        String[] callTypes = {"Voice Call", "Video Call", "WhatsApp Call"};
        ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_dropdown_item, callTypes);
        callTypeSpinner.setAdapter(adapter);

        // Capture selected call type
        callTypeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                selectedCallType = callTypes[position];
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
                selectedCallType = "Voice Call";
            }
        });

        // Call Button Click
        callButton.setOnClickListener(v -> {
            String number = phoneNumber.getText().toString().trim();
            if (isValidPhoneNumber(number)) {
                Toast.makeText(MainActivity.this, number + " " + selectedCallType + " initiating...", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(MainActivity.this, "Invalid Number", Toast.LENGTH_SHORT).show();
            }
        });

        // Save Button Click
        saveButton.setOnClickListener(v -> {
            String number = phoneNumber.getText().toString().trim();
            if (isValidPhoneNumber(number)) {
                Toast.makeText(MainActivity.this, number + " saved.", Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(MainActivity.this, "Invalid Number", Toast.LENGTH_SHORT).show();
            }
        });
    }

    // Phone number validation (10 digits only)
    private boolean isValidPhoneNumber(String number) {
        return number.matches("\\d{10}");
    }
}

activity.xml

.XML


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp"
    android:orientation="vertical"
    android:gravity="center">

    <!-- Phone Number Input -->
    <EditText
        android:id="@+id/phoneNumber"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter phone number"
        android:inputType="number"
        android:maxLength="10"
        android:textSize="18sp"
        android:padding="10dp"
        android:background="@android:drawable/edit_text" />

    <!-- Spinner for Call Type Selection -->
    <Spinner
        android:id="@+id/callTypeSpinner"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:padding="5dp" />

    <!-- Call Button -->
    <Button
        android:id="@+id/callButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Call"
        android:layout_marginTop="10dp"
        android:padding="10dp"
        android:background="@android:color/holo_blue_light"
        android:textColor="@android:color/black"
        android:textSize="18sp" />

    <!-- Save Button -->
    <Button
        android:id="@+id/saveButton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Save"
        android:layout_marginTop="10dp"
        android:padding="10dp"
        android:background="@android:color/holo_green_light"
        android:textColor="@android:color/black"
        android:textSize="18sp" />

</LinearLayout>