Android访问SD卡的工具类

package org.superzhao.Utils;

import android.os.Environment;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Created by Administrator on 2016-03-06.
 */
public class FileUtils {
    private String SDPath;

    public FileUtils() {
        //得到外部SD卡的位置目录
        SDPath = Environment.getExternalStorageDirectory() + "/";
    }

    public String getSDPath(){
        return SDPath;
    }

    /**
     * 在SD卡上创建文件
     */

    public File createFile(String FileName){
        File file = new File(SDPath+FileName);
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return file;
    }

    /**
     * 在SD卡上创建目录
     */

    public File createSDDir(String DirName){
        File dir = new File(SDPath+DirName);
        dir.mkdir();
        return dir;
    }

    /**
     * 判断SD中是否已经存在该文件
     */

    public Boolean isFileExit(String FileName){
        File file = new File(SDPath+FileName);
        return file.exists();
    }

    /**
     * 将一个inputstream里面的数据写到sd卡中
     */

    public File writeFromInputStream(String path,String fileName,InputStream is){
        File file = null;
        OutputStream os = null;
        try {
            createSDDir(path);
            file = createFile(path+fileName);
            os = new FileOutputStream(file);
            byte buffer[] = new byte[4*1024];
            try {
                while(is.read(buffer) != -1){
                    os.write(buffer);
                }
                os.flush();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }finally {
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return file;
    }
}