Before the new year will arrive I would like to post my 300 article posting this 2017 I called this program Palindrome in Android which contains two program. The first program in String Palindrome which ask the user to give a string or a word and then our program will check if the given word or string is a Palindrome or not. The second one is number palindrome which ask the user to give a number and then our program will determine and check if the given number is palindrome or not.
In addition I include about the program page which display about me as the developer of this application. I also added error checking code to avoid our application will crash is blank or empty spaces will be given by our user. I learned a lot in this application that I wrote and I want it to share to other programmers. I hope you will find my work useful.
I am currently accepting programming and web development work kindly contact me in the following email address for further details. Thank you.
My email address are the following jakerpomperada@gmail.com and jakerpomperada@yahoo.com.
My mobile number here in the Philippines is 09173084360.
My telephone number at home here in Bacolod City, Negros Occidental is (034) 4335675.
Main Menu Page
Checking Empty Values Page
String Palindrome Page
Number Palindrome Page
About This Program Page
Quit Program Page
Genymotion the Android Emulation that I use in writing this application.
Program Listing
About.java
package com.blogspot.jakerpomperada.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class About extends AppCompatActivity {
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_about);
}
}
MainActivity.java
package com.blogspot.jakerpomperada.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
public class MainActivity extends AppCompatActivity {
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void string_palindrome(View v) {
startActivity(new Intent(this, String_Palindrome.class));
}
public void number_palindrome(View v) {
startActivity(new Intent(this, Number_Palindrome.class));
}
public void about_this_program(View v) {
startActivity(new Intent(this, About.class));
}
public void quit(View v) {
// Toast.makeText((getApplicationContext()), "This is my Toast message!",Toast.LENGTH_LONG).show();
new AlertDialog.Builder(this)
.setMessage("Quit This Program?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
MainActivity.this.finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
String_Palindrome.java
package com.blogspot.jakerpomperada.myapplication;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.util.*;
public class String_Palindrome extends AppCompatActivity {
int given_number;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_string__palindrome);
}
public void clear_edit_text(View v) {
final EditText value_given = (EditText) findViewById(R.id.editValueGiven);
final TextView result = (TextView) findViewById(R.id.lblresult);
result.setText("");
value_given.setText("");
value_given.requestFocus();
}
public void check_string(View v) {
final EditText value_given = (EditText) findViewById(R.id.editValueGiven);
final TextView result = (TextView) findViewById(R.id.lblresult);
String GetEditText = value_given.getText().toString();
if(TextUtils.isEmpty(GetEditText)){
Toast.makeText(this, "Cannot Be Empty. Kindly provide a string or a word.", Toast.LENGTH_SHORT).show();
result.setText("");
value_given.setText("");
value_given.requestFocus();
} else {
try {
}catch (Exception e){
Toast.makeText(this, "Not a String", Toast.LENGTH_SHORT).show();
}
String reverse = "";
int length = GetEditText.trim().toLowerCase().length();
for ( int i = length - 1; i >= 0; i-- )
reverse = reverse + GetEditText.charAt(i);
if (GetEditText.trim().toLowerCase().equals(reverse.trim().toLowerCase())) {
result.setText(GetEditText.toUpperCase() + " is a Palindrome String. ");
} else {
result.setText(GetEditText.toUpperCase() + " is not a Palindrome String. ");
}
}
}
}
Number_Palindrome.java
package com.blogspot.jakerpomperada.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import android.text.TextUtils;
public class Number_Palindrome extends AppCompatActivity {
int given_number;
@Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_number__palindrome);
}
public void clear_edit_text(View v) {
final EditText value_given = (EditText) findViewById(R.id.editValueGiven);
final TextView result = (TextView) findViewById(R.id.lblresult);
result.setText("");
value_given.setText("");
value_given.requestFocus();
}
public void check_number(View v) {
final EditText value_given = (EditText) findViewById(R.id.editValueGiven);
final TextView result = (TextView) findViewById(R.id.lblresult);
String GetEditText = value_given.getText().toString();
if(TextUtils.isEmpty(GetEditText)){
Toast.makeText(this, "Cannot Be Empty. Kindly provide a number.", Toast.LENGTH_SHORT).show();
result.setText("");
value_given.setText("");
value_given.requestFocus();
} else {
try {
given_number = Integer.parseInt(value_given.getText().toString());
}catch (NumberFormatException e){
Toast.makeText(this, "Not a number", Toast.LENGTH_SHORT).show();
}
int i = 0, reverse = 0;
int q = given_number;
for (i = 0; i <= given_number; i++) {
reverse = reverse * 10;
reverse = reverse + given_number % 10;
given_number = given_number / 10;
i = 0;
}
if (reverse == q) {
result.setText(String.valueOf(q) + " is a Palindrome Number. ");
} else {
result.setText(String.valueOf(q) + " is not a Palindrome Number. ");
}
}
}
}
activity_about.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" android:background="@android:color/holo_green_light" tools:background="@android:color/holo_green_light" tools:context="com.blogspot.jakerpomperada.myapplication.About">
<RelativeLayout android:layout_width="368dp" android:layout_height="495dp" tools:layout_editor_absoluteX="8dp" tools:layout_editor_absoluteY="8dp">
<TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentStart="true" android:layout_marginBottom="40dp" android:layout_marginStart="12dp" android:gravity="left" android:lines="10" android:maxLines="17" android:text="\nThis program was designed and developed by Mr. Jake R. Pomperada. I live in Bacolod City, Negros Occidental Philippines. \n\nYou can email me at the following email address jakerpomperada@yahoo.com and jakerpomperada@gmail.com \n\nThank you for using this software." android:textAppearance="@style/TextAppearance.AppCompat.Medium" android:textColor="@android:color/background_light" android:textStyle="bold" />
<ImageView android:id="@+id/imageView3" android:layout_width="193dp" android:layout_height="188dp" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="50dp" app:srcCompat="@drawable/me" tools:layout_editor_absoluteX="102dp" tools:layout_editor_absoluteY="55dp" />
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
activity_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" android:background="@android:color/holo_green_light" tools:context="com.blogspot.jakerpomperada.myapplication.MainActivity">
<LinearLayout android:layout_width="368dp" android:layout_height="495dp" android:orientation="vertical" tools:layout_editor_absoluteX="8dp" tools:layout_editor_absoluteY="8dp">
<Button android:id="@+id/button21" android:onClick="string_palindrome" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:background="@android:color/background_light" android:padding="20dip" android:text="String Palindrome" android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large" />
<Button android:id="@+id/button22" android:onClick="number_palindrome" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:background="@android:color/background_light" android:padding="20dip" android:text="Number Palindrome" android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large" />
<Button android:id="@+id/button22" android:onClick="about_this_program" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:background="@android:color/background_light" android:padding="20dip" android:text="About This Program" android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large" />
<Button android:id="@+id/button22" android:onClick="quit" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:background="@android:color/background_light" android:elevation="0dp" android:padding="20dip" android:text="Quit This Program" android:textAppearance="@android:style/TextAppearance.DeviceDefault.Large" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
activity_number_palindrome.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" android:background="@android:color/holo_green_light" tools:context="com.blogspot.jakerpomperada.myapplication.Number_Palindrome">
<RelativeLayout android:layout_width="368dp" android:layout_height="499dp" tools:layout_editor_absoluteX="8dp" tools:layout_editor_absoluteY="0dp">
<TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_alignStart="@+id/editValueGiven" android:layout_marginTop="25dp" android:text="Enter a Number" android:textAppearance="@style/TextAppearance.AppCompat.Headline" android:textColor="@android:color/background_light" />
<EditText android:id="@+id/editValueGiven" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView2" android:layout_centerHorizontal="true" android:layout_marginTop="27dp" android:ems="10" android:inputType="number" android:textAppearance="@style/TextAppearance.AppCompat.Headline" android:textColor="@android:color/background_light" />
<Button android:id="@+id/button" android:layout_width="279dp" android:layout_height="wrap_content" android:layout_alignEnd="@+id/editValueGiven" android:layout_below="@+id/editValueGiven" android:layout_marginTop="125dp" android:background="@android:color/background_light" android:onClick="check_number" android:text="Check Number" android:textAppearance="@style/TextAppearance.AppCompat.Headline" tools:layout_editor_absoluteX="53dp" tools:layout_editor_absoluteY="259dp" />
<Button android:id="@+id/button2" android:layout_width="281dp" android:layout_height="51dp" android:layout_alignStart="@+id/button" android:layout_below="@+id/button" android:layout_marginTop="60dp" android:background="@android:color/background_light" android:onClick="clear_edit_text" android:text="Clear" android:textAppearance="@style/TextAppearance.AppCompat.Headline" tools:layout_editor_absoluteX="78dp" tools:layout_editor_absoluteY="378dp" />
<TextView android:id="@+id/lblresult" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignStart="@+id/button" android:layout_below="@+id/editValueGiven" android:layout_marginTop="41dp" android:textAppearance="@style/TextAppearance.AppCompat.Headline" android:textColor="@android:color/background_light" />
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
activity_string_palindrome.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" android:background="@android:color/holo_green_light" tools:context="com.blogspot.jakerpomperada.myapplication.Number_Palindrome">
<RelativeLayout android:layout_width="368dp" android:layout_height="499dp" tools:layout_editor_absoluteX="8dp" tools:layout_editor_absoluteY="0dp">
<TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_alignStart="@+id/editValueGiven" android:layout_marginTop="25dp" android:text="Enter a String" android:textAppearance="@style/TextAppearance.AppCompat.Headline" android:textColor="@android:color/background_light" />
<EditText android:digits="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890" android:inputType="textFilter" android:id="@+id/editValueGiven" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView2" android:layout_centerHorizontal="true" android:layout_marginTop="27dp" android:ems="10" android:textAppearance="@style/TextAppearance.AppCompat.Headline" android:textColor="@android:color/background_light" />
<Button android:id="@+id/button" android:layout_width="279dp" android:layout_height="wrap_content" android:layout_alignEnd="@+id/editValueGiven" android:layout_below="@+id/editValueGiven" android:layout_marginTop="125dp" android:background="@android:color/background_light" android:onClick="check_string" android:text="Check String" android:textAppearance="@style/TextAppearance.AppCompat.Headline" tools:layout_editor_absoluteX="53dp" tools:layout_editor_absoluteY="259dp" />
<Button android:id="@+id/button2" android:layout_width="281dp" android:layout_height="51dp" android:layout_alignStart="@+id/button" android:layout_below="@+id/button" android:layout_marginTop="60dp" android:background="@android:color/background_light" android:onClick="clear_edit_text" android:text="Clear" android:textAppearance="@style/TextAppearance.AppCompat.Headline" tools:layout_editor_absoluteX="78dp" tools:layout_editor_absoluteY="378dp" />
<TextView android:id="@+id/lblresult" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignStart="@+id/button" android:layout_below="@+id/editValueGiven" android:layout_marginTop="41dp" android:textAppearance="@style/TextAppearance.AppCompat.Headline" android:textColor="@android:color/background_light" />
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
DOWNLOAD SOURCE CODE HERE
DOWNLOAD APK FILE HERE
