写入SDCard

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package com.example.sdcard;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import android.app.Activity;import android.os.Bundle;import android.os.Environment;import android.util.Log;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//setContentView(R.layout.activity_main);//首先判断设备是否挂载SDCardboolean isMounted = Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);if(isMounted){try {writeFileToSDCard();} catch (IOException e) {e.printStackTrace();}}else{Log.d("SDCard错误","未安装SDCard");}}//写一个文件到SD卡private void writeFileToSDCard() throws IOException{// 比如可以将一个文件作为普通的文档存储，那么先获取系统默认的文档存放根目录 File parent_path = Environment.getExternalStorageDirectory();//可以建立一个子目录专门存放自己的专属文件File dir = new File(parent_path.getAbsoluteFile(),"Rokends!");dir.mkdir();File file = new File(dir.getAbsoluteFile(),"myfile.txt");Log.d("文件路径", file.getAbsolutePath());//创建这个文件，如果不存在的话file.createNewFile();FileOutputStream fos = new FileOutputStream(file);String data = "hello,wrold! Rokends @ CSDN";byte[] buffer = data.getBytes();//开始写入数据到这个文件fos.write(buffer,0,buffer.length);fos.flush();fos.close();Log.d("文件写入", "成功！");}}

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

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