Android : Prime Number

In This Tutorial We Will Create Simple Prime Number Finder Application.

1. Create New Android Application.
2. Name It As PrimeNumber.
3. Open activity_main.xml File.
4. Drag And Drop One EditText And One Button
    Or Replace Your activity_main.xml with Below Code.

 activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <EditText

        android:id="@+id/editText1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentLeft="true"

        android:layout_alignParentTop="true"

        android:layout_marginLeft="18dp"

        android:layout_marginTop="46dp"

        android:ems="10"

        android:hint="Enter Number"

        android:inputType="number" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignLeft="@+id/editText1"

        android:layout_below="@+id/editText1"

        android:layout_marginTop="34dp"

        android:text="Check" />

</RelativeLayout>

5. Now Open Your MainActivity.java File And Replace it With Below Code.

MainActivity.java

package arshad.primenumber;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

public class MainActivity extends Activity {

 EditText input;

 Button Check;

                @Override

                protected void onCreate(Bundle savedInstanceState) {

                                super.onCreate(savedInstanceState);

                                setContentView(R.layout.activity_main);

                                input=(EditText)findViewById(R.id.editText1);

                                Check=(Button)findViewById(R.id.button1);

                               

                                Check.setOnClickListener(new OnClickListener()

                                {

                                                @Override

                                                public void onClick(View arg0) {

                                                                  double n = Double.parseDouble(input.getText().toString());

                                                                 int f = 0;

                                               

                                                  

                           

                            for (int i = 2; i < n; i++)

                            {

                                if (n % i == 0)

                                    f = 1;

                            }

                            if (f == 0)

                            {

                                Toast t = Toast.makeText(getApplicationContext(),

                                        "Given Number is Prime Number",

                                                 Toast.LENGTH_SHORT);

                                         t.show();

                            }else{

                                Toast t = Toast.makeText(getApplicationContext(),

                                        "Given Number is Not a Prime Number",

                                                 Toast.LENGTH_SHORT);

                                         t.show();

                                                                               

                                                }

                                                }});

                }

                @Override

                public boolean onCreateOptionsMenu(Menu menu) {

                                // Inflate the menu; this adds items to the action bar if it is present.

                                getMenuInflater().inflate(R.menu.main, menu);

                                return true;

                }

}

6. Now Run It As Android Application And Enter Any Number And Check Whether Prime Or Not.


My Output Screen's.

All The Best :)