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建立一个安卓应用来检查一个号码是否是自同构的

原文:https://www . geesforgeks . org/build-an-Android-app-to-check-a-number-is-automotive-or-not/

什么是自同构数?如果一个数的平方与数本身的位数相同,则称该数为自同构。

示例:

Input  : N = 76 
Output : Automorphic
Explanation: As 76*76 = 5776

Input  : N = 25
Output : Automorphic
As 25*25 = 625

Input : N = 7
Output : Not Automorphic
As 7*7 = 49

分步实施

第一步:创建新项目

要在安卓工作室创建新项目,请参考如何在安卓工作室创建/启动新项目。注意选择 Java 作为编程语言。

步骤 2:使用 activity_main.xml 文件

导航到应用程序> res >布局> activity_main.xml 并将下面的代码添加到该文件中。下面是 activity_main.xml 文件的代码。

可扩展标记语言

<?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"
    android:background="@color/teal_200">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Automorphic Number or Not"
        android:textColor="@color/black"
        android:textSize="26sp"
        app:layout_constraintBottom_toTopOf="@+id/textView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.491" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Enter a number to check Automorphic Number"
        android:textColor="@color/black"
        android:textSize="18sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.494"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.4" />

    <EditText
        android:id="@+id/etNum"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:hint="ENTER THE NUMBER"
        android:inputType="number"
        app:layout_constraintEnd_toEndOf="@+id/textView"
        app:layout_constraintStart_toStartOf="@+id/textView"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <Button
        android:id="@+id/btnCheck"
        android:layout_width="149dp"
        android:layout_height="50dp"
        android:layout_margin="10dp"
        android:layout_marginTop="16dp"
        android:backgroundTint="@color/black"
        android:text="Check"
        android:textColor="@color/teal_700"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="@+id/etNum"
        app:layout_constraintHorizontal_bias="0.496"
        app:layout_constraintStart_toStartOf="@+id/etNum"
        app:layout_constraintTop_toBottomOf="@+id/etNum"
        app:layout_constraintVertical_bias="0.113" />

</androidx.constraintlayout.widget.ConstraintLayout>

第三步:使用T2【主活动. kt】文件

转到 MainActivity.kt 文件,参考以下代码。下面是 MainActivity.kt 文件的代码。代码中添加了注释,以更详细地理解代码。这里我们将绑定视图并编写应用程序的逻辑。

我的锅

import android.R.bool
import android.os.Bundle
import android.widget.Button
import android.widget.EditText
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {
  lateinit var btnCheck : Button
  lateinit var etNum : EditText

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        supportActionBar?.hide()

        // Binding the views
        btnCheck = findViewById(R.id.btnCheck)
        etNum = findViewById(R.id.etNum)

        btnCheck.setOnClickListener {
            val n = etNum.text.toString().length
            val num = etNum.text.toString().toInt()
            var temp = num
            var result = 0

            if (isAutomorphic(num))
                Toast.makeText(this, "Automorphic Number", Toast.LENGTH_SHORT).show()
            else
                Toast.makeText(this, "Not an Automorphic Number", Toast.LENGTH_SHORT).show()
        }

    }

    fun isAutomorphic(N: Int): Boolean {

        // Store the square
        var N = N
        var sq = N * N

        // Start Comparing digits
        while (N > 0) {
            // Return false, if any digit of N doesn't
            // match with its square's digits from last
            if (N % 10 != sq % 10) return false

            // Reduce N and square
            N /= 10
            sq /= 10
        }
        return true
    }

}

输出:


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