EditText Example with print Prime numbers on other screen

Screenshots:

string.xml:

<resources>
    <string name="app_name">Prime Number</string>

</resources>

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.krishanandroid.primenumber.MainActivity">


    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="24dp"
        android:inputType="number"
        android:hint="Enter number"
        android:id="@+id/editTextUserNumber"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/addButton"
        android:text="Print Prime Number"
        android:onClick="pPrimeNumberMethod"/>

</LinearLayout>

activity_second.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_second"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.krishanandroid.primenumber.SecondActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Prime number : "
        android:id="@+id/enterNumberText"
        android:textSize="16dp"
        android:textColor="@color/colorPrimary"/>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Result: "
            android:id="@+id/resultText"
            android:textSize="16dp"
            android:textColor="@color/colorPrimaryDark"/>

    </ScrollView>


</LinearLayout>

AndroidManifest.xml:

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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>
        <activity android:name=".SecondActivity"></activity>
    </application>

</manifest>

SecondActivity.java:

package com.krishanandroid.primenumber;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends AppCompatActivity {

    TextView    vResult;
    TextView    vEnterUserNumber;

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

        vResult = (TextView) findViewById(R.id.resultText);
        vEnterUserNumber = (TextView) findViewById(R.id.enterNumberText);

        Intent intent = getIntent();
        Bundle b = intent.getExtras();

        int userNumber = b.getInt("enterUserNumber");
        String result = b.getString("resultPrimeNumbers");

        vEnterUserNumber.setText("Prime numbers from 0 to "+userNumber+ ":");
        vResult.setText(result);
    }
}

MainActivity.java:

package com.krishanandroid.primenumber;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    EditText            vEtNum;
    String              vGetNum;


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

        vEtNum = (EditText) findViewById(R.id.editTextUserNumber);

    }

    public void pPrimeNumberMethod(View view) {

        String      primeNumbers = ""; // take empty string
        int         i =0;
        int         j =0;

        vGetNum = vEtNum.getText().toString();

        // validation for empty edit text field
        if (vGetNum.length() == 0)  {
            Toast.makeText(this, "Please enter number", Toast.LENGTH_SHORT).show();
        }

        int vGetNumber = Integer.parseInt(vGetNum);

        for (i = 1; i <= vGetNumber; i++)
        {
            int counter=0;
            for(j =i; j>=1; j--)
            {
                if(i%j==0)
                {
                    counter = counter + 1;
                }
            }
            if (counter ==2)
            {
                //Appended the Prime number to the String
                primeNumbers = (primeNumbers + i + ", ");
            }
        }

        Intent intent = new Intent(MainActivity.this, SecondActivity.class);
        intent.putExtra("enterUserNumber", vGetNumber);
        intent.putExtra("resultPrimeNumbers", primeNumbers);
        startActivity(intent);
    }
}