逝去的青春

--------悼念的那个美丽的梦想

安卓开发学习,一个创建文件,删除文件,读取文件,写入文件的类

作者：jao 发布于：2013-6-15 17:48 分类：Andriod开发

以下就是源码,我花了一个下午,我晕死

package com.jao.printlogcat;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.FileReader;

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(); 

    } 

    /**
     * 向SD卡中写入文本文件
     * @param fileName
     * 
     * @return
     * 
     **/
public String writeSDFile(String fileName, String str){
	 File file = new File(SDPATH + "//" + fileName); 
	 
	 try { 
		 FileWriter fis = new FileWriter(file);
         fis.write(str);
         fis.close();
     } catch (FileNotFoundException e) { 

         e.printStackTrace(); 

     } catch (IOException e) { 

         e.printStackTrace(); 

     } 
	
	return str;
}
    /**

     * 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 { 

            FileReader fis = new FileReader(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; 

    } 

} 

标签: java 安卓

评论：