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Android写入txt文件

分以下几个步骤：

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首先对manifest注册SD卡读写权限

AndroidManifest.xml

?xml version="1.0" encoding="utf-8"?

manifest xmlns:android="

package="com.tes.textsd"

android:versionCode="1"

android:versionName="1.0"

uses-sdk

android:minSdkVersion="8"

android:targetSdkVersion="16" /

uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/

application

android:allowBackup="true"

android:icon="@drawable/ic_launcher"

android:label="@string/app_name"

android:theme="@style/AppTheme"

activity

android:name="com.tes.textsd.FileOperateActivity"

android:label="@string/app_name"

intent-filter

action android:name="android.intent.action.MAIN" /

category android:name="android.intent.category.LAUNCHER" /

/intent-filter

/activity

/application

/manifest

创建一个对SD卡中文件读写的类

FileHelper.java

/**

* @Title: FileHelper.java

* @Package com.tes.textsd

* @Description: TODO(用一句话描述该文件做什么)

* @author Alex.Z

* @date 2013-2-26 下午5:45:40

* @version V1.0

package com.tes.textsd;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import java.io.FileWriter;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import android.content.Context;

import android.os.Environment;

public class FileHelper {

private Context context;

/** SD卡是否存在**/

private boolean hasSD = false;

/** SD卡的路径**/

private String SDPATH;

/** 当前程序包的路径**/

private String FILESPATH;

public FileHelper(Context context) {

this.context = context;

hasSD = Environment.getExternalStorageState().equals(

android.os.Environment.MEDIA_MOUNTED);

SDPATH = Environment.getExternalStorageDirectory().getPath();

FILESPATH = this.context.getFilesDir().getPath();

}

/**

* 在SD卡上创建文件

* @throws IOException

public File createSDFile(String fileName) throws IOException {

File file = new File(SDPATH + "//" + fileName);

if (!file.exists()) {

file.createNewFile();

}

return file;

}

/**

* 删除SD卡上的文件

* @param fileName

public boolean deleteSDFile(String fileName) {

File file = new File(SDPATH + "//" + fileName);

if (file == null || !file.exists() || file.isDirectory())

return false;

return file.delete();

}

/**

* 写入内容到SD卡中的txt文本中

* str为内容

public void writeSDFile(String str,String fileName)

{

try {

FileWriter fw = new FileWriter(SDPATH + "//" + fileName);

File f = new File(SDPATH + "//" + fileName);

fw.write(str);

FileOutputStream os = new FileOutputStream(f);

DataOutputStream out = new DataOutputStream(os);

out.writeShort(2);

out.writeUTF("");

System.out.println(out);

fw.flush();

fw.close();

System.out.println(fw);

} catch (Exception e) {

}

/**

* 读取SD卡中文本文件

* @param fileName

* @return

public String readSDFile(String fileName) {

StringBuffer sb = new StringBuffer();

File file = new File(SDPATH + "//" + fileName);

try {

FileInputStream fis = new FileInputStream(file);

int c;

while ((c = fis.read()) != -1) {

sb.append((char) c);

}

fis.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return sb.toString();

}

public String getFILESPATH() {

return FILESPATH;

}

public String getSDPATH() {

return SDPATH;

}

public boolean hasSD() {

return hasSD;

}

写一个用于检测读写功能的的布局

main.xml

?xml version="1.0" encoding="utf-8"?

LinearLayout xmlns:android="