How to Convert String to Base64 ?

Demo:

1)MainActivity.java:

package com.venky.convertstringtobase64;

import android.app.Activity;

import android.os.Build;

import android.os.Bundle;

import android.widget.TextView;

public class MainActivity extends Activity {

      TextView tvNormal, tvEncoded;

      String normalString = "Welcome to Android !";

      String convertString;

      @Override

      protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.activity_main);

            tvNormal = (TextView) findViewById(R.id.tvNormal);

            tvEncoded = (TextView) findViewById(R.id.tvEncoded);

            convertString = encodeToBase64(normalString);

            tvNormal.setText("Normal String\n" + normalString);

            tvEncoded.setText("Base64\n" + convertString);

      }

      public String encodeToBase64(String string) {

            String encodedString = "";

            try {

                  byte[] byteData = null;

                  if (Build.VERSION.SDK_INT >= 8) {

                        byteData = android.util.Base64.encode(string.getBytes(),

                                    android.util.Base64.DEFAULT);

                  }

                  encodedString = new String(byteData);

            } catch (Exception e) {

            }

            return encodedString;

      }

}

2)activity_main.xml:

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

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

    android:id="@+id/LinearLayout1"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="#5F04B4"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/tvNormal"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="50dp"

        android:gravity="center"

        android:textColor="#ffffff"

        android:textSize="15dp"

        android:textStyle="bold" />

    <TextView

        android:id="@+id/tvEncoded"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_marginTop="30dp"

        android:gravity="center"

        android:textColor="#ffffff"

        android:textSize="15dp"

        android:textStyle="bold" />

</LinearLayout>

3)Download this code Click Here