Android | Display multiplication table of a number

Given a number, the task is to display the multiplication table of this number using the Android App.

Steps to build app:

STEP-1: Open activity_main.xml file and add TextView, EditText and a Button
STEP-2: Assign ID to each component
STEP-3: Now, open up the MainActivity file and declare the variables.
STEP-4: Read the values entered in the EditText boxes using an id which have been set in the XML code above.
STEP-5: Add a click listener to the Add button
STEP-6: When the Add button has been clicked we need to Multiply the values and store it into Buffer
STEP-7: Then show the resultant output in the TextView by setting the buffer in the TexView.

Implementation:

activity_main.xml

<!-- First make the layout file xml and add button, edit text, text view -->
  
<?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"
    tools:layout_editor_absoluteY="25dp"> 
  
    <!-- Add the button for run table logic and print result-->
    <!-- give id "button"-->
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="TABLE"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@+id/editText"
        app:layout_constraintTop_toTopOf="parent" /> 
  
    <!-- Text view for result view-->
    <!-- give the id TextView-->
    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginBottom="18dp"
        android:layout_marginEnd="36dp"
        android:layout_marginLeft="36dp"
        android:layout_marginRight="36dp"
        android:layout_marginStart="36dp"
        android:textColor="@color/colorPrimary"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText" /> 
  
    <!-- edit Text for take input from user-->
    <!-- give the id editText-->
    <EditText
        android:id="@+id/editText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="20dp"
        android:layout_marginEnd="9dp"
        android:layout_marginRight="9dp"
        android:layout_marginTop="16dp"
        android:ems="10"
        android:inputType="number"
        app:layout_constraintBottom_toTopOf="@+id/textView2"
        app:layout_constraintEnd_toStartOf="@+id/button"
        app:layout_constraintHorizontal_chainStyle="packed"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="UnknownId" /> 
</android.support.constraint.ConstraintLayout> 

MainActivity.Java

// Build the java logic for multiplication table 
// using button, text view, edit text 
  
package com.example.windows10.tabel; 
  
import android.app.Dialog; 
import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
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 
    implements View.OnClickListener { 
  
    // define the global variable 
  
    // variable number1, number2 for input input number 
    // Add_button, result textView 
  
    EditText editText; 
    Button button; 
    TextView result; 
    int ans = 0; 
  
    protected void onCreate(Bundle savedInstanceState) 
    { 
        super.onCreate(savedInstanceState); 
        setContentView(R.layout.activity_main); 
  
        // by ID we can use each component 
        // whose id is assigned in the XML file 
  
        editText = (EditText)findViewById(R.id.editText); 
        button = (Button)findViewById(R.id.button); 
        result = (TextView)findViewById(R.id.textView); 
  
        // set clickListener on button 
        button.setOnClickListener(this); 
    } 
  
    @Override
    public void onClick(View v) 
    { 
  
        switch (v.getId()) { 
  
        case R.id.button: 
            StringBuffer buffer = new StringBuffer(); 
            int res; 
  
            // get the input number from editText 
            String fs = editText.getText().toString(); 
  
            // convert it to integer 
            int n = Integer.parseInt(fs); 
  
            // build the logic for table 
            for (int i = 1; i <= 10; i++) { 
                ans = (i * n); 
                buffer.append(n + " X " + i 
                              + " = " + ans + "\n\n"); 
            } 
  
            // set the buffer textview 
            result.setText(buffer); 
            break; 
        } 
    } 
} 

Output:

My Personal Notes

activity_main.xml

MainActivity.Java

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