Java tutorial
//package com.java2s; import android.os.Environment; import java.io.File; import java.io.FileOutputStream; public class Main { public static void WriteStringToSD(String fileName, String content) { Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); File file = new File(Environment.getExternalStorageDirectory(), fileName); try { FileOutputStream fos = new FileOutputStream(file, true); fos.write(content.getBytes()); fos.close(); } catch (Exception ex) { ex.printStackTrace(); } } }