Category Archives: Decrypt String

How to encrypt a string in Android Using Base64?

package com.coderzheaven.encryptstring;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.util.Base64;

@SuppressLint({ "WorldReadableFiles", "WorldWriteableFiles" })
public class MainActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		saveText("CoderzHeaven");
		System.out.println(getText());
	}

	public void saveText(String text) {
		SharedPreferences myPrefs = this.getSharedPreferences("myPrefs",
				MODE_WORLD_READABLE);
		SharedPreferences.Editor editor = myPrefs.edit();
		text = Base64.encodeToString(text.getBytes(), Base64.DEFAULT);
		editor.putString("some_text", text);
		editor.commit();
	}

	public String getText() {
		SharedPreferences myPrefs = this.getSharedPreferences("myPrefs",
				MODE_WORLD_WRITEABLE);
		String text = myPrefs.getString("some_text", null);
		text = new String(Base64.decode(text, Base64.DEFAULT));
		return text;
	}
}

Please check the LogCat for output.

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