向android中写文件

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;
}
}

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();}}