Generate random String using org.apache.commons.lang3.RandomStringUtils

This example show how to generate random String using org.apache.commons.lang3.RandomStringUtils.

You have to download Apache Commons Lang, and add the jar to Android Studio Project's libs. Refer to the video.

package com.blogspot.android_er.androidrandomstring;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.apache.commons.lang3.RandomStringUtils;

public class MainActivity extends AppCompatActivity {

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

        Button btnGenerate = (Button)findViewById(R.id.gen);
        final TextView textResult = (TextView)findViewById(R.id.result);

        btnGenerate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                textResult.setText("");
                for(int i=1; i<20; i++){
                    String randomString = RandomStringUtils.randomAlphabetic(i) + "\n";
                    textResult.append(randomString);
                }
            }
        });

    }
}

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="16dp"
    android:orientation="vertical"
    tools:context="com.blogspot.android_er.androidrandomstring.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/gen"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Generate Random Strings"/>

    <TextView
        android:id="@+id/result"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:typeface="monospace"
        android:textSize="22sp"/>
</LinearLayout>