To create a two screens , first screen will take one number input from user. After click on Factorial button, second screen will open and it should display factorial of the same number using Explicit Intents.
Latest Version Android Studio
Step 1: Open Android Studio and then click on File -> New -> New project.
Step 2: Then type the Application name as HelloWorld and click Next.
Step 3: Then select the Minimum SDK as shown below and click Next.
Step 4: Then select the Empty Activity and click Next. Finally click Finish.
Step 5: Design layout in activity_main.xml.
Step 6: Display message give in MainActivity file.
Step 7: Save and run the application.
/*
Program to print the text “ExplicitIntent”.
Developed by: PINTO PONNACHAN
Registration Number: 212221040121
*/
activity_main.xml :
<?xml version="1.0" encoding="utf-8"?>
<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">
<TextView
android:id="@+id/maintxt"
android:layout_width="317dp"
android:layout_height="38dp"
android:layout_marginTop="36dp"
android:text="FACTORIAL CALCULATOR"
android:textAlignment="center"
android:textColor="@color/purple_700"
android:textSize="25sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/text1"
android:layout_width="156dp"
android:layout_height="32dp"
android:layout_marginStart="76dp"
android:layout_marginTop="240dp"
android:text="Enter a Number"
android:textColor="@color/black"
android:textSize="20sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<EditText
android:id="@+id/n1"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_alignRight="@+id/text1"
android:layout_marginTop="224dp"
android:layout_marginEnd="120dp"
android:textColor="#EA80FC"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/btn1"
android:layout_width="108dp"
android:layout_height="45dp"
android:layout_marginBottom="360dp"
android:background="#2C34CF"
android:text="Calculate"
android:textColor="@color/white"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.498"
app:layout_constraintStart_toStartOf="parent" />
<TextView
android:id="@+id/resum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="150dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java :
package com.example.factorialcalculator;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
public static String Send_Result;
EditText num1;
TextView txtrslt;
Button btn;
double n,i=1,fact=1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
num1 = (EditText) findViewById(R.id.n1);
txtrslt = (TextView) findViewById(R.id.resum);
btn = (Button) findViewById(R.id.btn1);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
n = Double.parseDouble(num1.getText().toString());
while (i<=n)
{
fact=fact*i;
i++;
}
String message = Double.toString(fact);
Intent myIntent = new Intent(MainActivity.this, MainActivity2.class);
myIntent.putExtra(Send_Result, message);
startActivity(myIntent);
}
});
}
}
activity_main2.xml :
<?xml version="1.0" encoding="utf-8"?>
<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=".MainActivity2">
<TextView
android:id="@+id/textView"
android:layout_width="137dp"
android:layout_height="47dp"
android:text="RESULT : "
android:textColor="@color/black"
android:textSize="34sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.167"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.425" />
<TextView
android:id="@+id/reslt"
android:layout_width="198dp"
android:layout_height="59dp"
android:text="00.00"
android:textColor="#EA80FC"
android:textSize="38sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.924"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.433" />
</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity2.java :
package com.example.factorialcalculator;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity2 extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.Send_Result);
TextView textView = findViewById(R.id.reslt);
textView.setText(message);
}
}
Thus, a Simple Android Application create a Explicit Intents using Android Studio is developed and executed successfully.