Question

Using Android Studio Java, create a program which has two functions:

Function1: has a text field and a button to invoke "Function 2"

Function 2: process the data entered in the text field on Function 1.

• If data in text field starts with "url:" (for e.g. url:www.google.com or url:www,palomar.edu), display the URL in the default browser.
• If data in text field starts with "phone:" ( for e.g. "phone:7607441150"), call the phone number using the dialer application.

Answer 1

AndroidManifest.xml

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

    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.CALL_PHONE"/>

    <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>

activity_main.xml

<androidx.constraintlayout.widget.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">

    <EditText
        android:id="@+id/parserField"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="150dp"
        android:layout_marginEnd="8dp"
        android:ems="10"
        android:hint="Enter URL/Phone Number"
        android:inputType="textPersonName"
        android:padding="16dp"
        android:textAlignment="center"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/submitButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="50dp"
        android:backgroundTint="@color/colorAccent"
        android:padding="16dp"
        android:text="Submit"
        android:textColor="@android:color/white"
        android:textSize="18sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/parserField" />
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private EditText parserField;
    private Button submitButton;

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

        function1();
    }

    private void function1()
    {
        parserField = (EditText) findViewById(R.id.parserField);
        submitButton = (Button) findViewById(R.id.submitButton);

        submitButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                final String text = parserField.getText().toString();
                function2(text);
            }
        });
    }

    private void function2(String text)
    {
        String[] data = text.split(":");
        String indicator = data[0];     // url or phone
        String value = data[1];

        switch (indicator)
        {
            case "url":
            {
                if (!value.startsWith("http://") && !value.startsWith("https://"))
                    value = "http://" + value;

                Uri url = Uri.parse(value);

                Intent browserIntent = new Intent(Intent.ACTION_VIEW, url);
                if (browserIntent.resolveActivity(getPackageManager()) != null) {
                    startActivity(browserIntent);
                }
                break;
            }

            case "phone":
            {
                if(!value.startsWith("tel:"))
                    value = "tel:" + value.trim();

                Uri callNumber = Uri.parse(value);
                Intent callerIntent = new Intent(Intent.ACTION_DIAL);
                callerIntent.setData(callNumber);
                startActivity(callerIntent);
                break;
            }
        }
    }
}

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