Java tutorial
//package com.java2s; import java.io.File; import java.io.RandomAccessFile; import android.content.Context; public class Main { public static void WriteTxtFile(Context context, String strcontent) { String strContent = strcontent + "\n"; try { File file = new File(context.getCacheDir() + File.separator + "wanjia.txt"); if (!file.exists()) { file.createNewFile(); } RandomAccessFile raf = new RandomAccessFile(file, "rw"); raf.seek(file.length()); raf.write(strContent.getBytes()); raf.close(); } catch (Exception e) { e.printStackTrace(); } } }