向android中写文件

本文主要是介绍向android中写文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;public class WriteFile {//创建和写文件private static String path = "/sdcard/";private static String filenameTemp;/*** 创建文件* * @throws IOException*/public static boolean creatTxtFile(String name) throws IOException {boolean flag = false;filenameTemp = path + name + ".txt";File filename = new File(filenameTemp);if (!filename.exists()) {filename.createNewFile();flag = true;}return flag;}/*** 写文件* * @param newStr*            新内容* @throws IOException*/public static boolean writeTxtFile(String newStr) throws IOException {// 先读取原有文件内容，然后进行写入操作boolean flag = false;String filein = newStr + "\r\n";String temp = "";FileInputStream fis = null;InputStreamReader isr = null;BufferedReader br = null;FileOutputStream fos = null;PrintWriter pw = null;try {// 文件路径File file = new File(filenameTemp);// 将文件读入输入流fis = new FileInputStream(file);isr = new InputStreamReader(fis);br = new BufferedReader(isr);StringBuffer buf = new StringBuffer();// 保存该文件原有的内容for (int j = 1; (temp = br.readLine()) != null; j++) {buf = buf.append(temp);// System.getProperty("line.separator")// 行与行之间的分隔符 相当于“\n”buf = buf.append(System.getProperty("line.separator"));}buf.append(filein);fos = new FileOutputStream(file);pw = new PrintWriter(fos);pw.write(buf.toString().toCharArray());pw.flush();flag = true;} catch (IOException e1) {// TODO 自动生成 catch 块throw e1;} finally {if (pw != null) {pw.close();}if (fos != null) {fos.close();}if (br != null) {br.close();}if (isr != null) {isr.close();}if (fis != null) {fis.close();}}return flag;}
}

在其他类中调用方法

private void writeFile() {// TODO Auto-generated method stubWriteFile myFile = new WriteFile();try {myFile.creatTxtFile("文件名");Date now=new Date();SimpleDateFormat dateFormat=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String name = dateFormat.format(now);//写入的信息myFile.writeTxtFile(name+","+lac+","+plot1.getText()+","+longitude+","+latitude+","+currentsingle);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}

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