Generate Random String

How To Android Generate Random String:-

Xml Files:-

activity_main.xml

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:layout_gravity="center"

    android:background="#0e2f44"

    android:gravity="center"

    android:orientation="vertical" >

    <Button

        android:id="@+id/button1"

        android:layout_width="230dp"

        android:layout_height="50dp"

        android:background="@drawable/btnstroke"

        android:text="Generate Random String" />

    <LinearLayout

        android:id="@+id/editDig"

        android:layout_width="fill_parent"

        android:layout_height="50dp"

        android:layout_marginLeft="30dp"

        android:layout_marginRight="30dp"

        android:layout_marginTop="30dp"

        android:background="@drawable/strokeedittext"

        android:gravity="center"

        android:orientation="vertical" >

        <TextView

            android:id="@+id/textView1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_below="@+id/button1"

            android:layout_centerHorizontal="true"

            android:textColor="#ffffff"

            android:textSize="10pt"

            android:textStyle="bold" />

    </LinearLayout>

</LinearLayout>

Java Files:-

MainActivity.java

package com.parthiv.random;

import java.util.Random;

import android.os.Bundle;

import android.app.Activity;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity {

Random random = new Random();

private static final String _CHAR = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";

private static final int RANDOM_STR_LENGTH = 12;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

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

btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

TextView text_Random = (TextView) findViewById(R.id.textView1);

text_Random.setText(getRandomString());

}

});

}

// This method for generate numbers with char.

public String getRandomString() {

StringBuffer randStr = new StringBuffer();

for (int i = 0; i < RANDOM_STR_LENGTH; i++) {

int number = getRandomNumber();

char ch = _CHAR.charAt(number);

randStr.append(ch);

}

return randStr.toString();

}

// This method for generate only numbers.

private int getRandomNumber() {

int randomInt = 0;

randomInt = random.nextInt(_CHAR.length());

if (randomInt - 1 == -1) {

return randomInt;

} else {

return randomInt - 1;

}

}

}

outputs:-

                               

Download RandomString.Zip

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