大过年的，不下班的，上个Android文件操作类（内部存储和sd卡均可）

package com.kkdiangame.UI.res;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import android.content.Context;
import android.os.Environment;

public class FileUtils {

private String SDPATH;

public String getSDPATH() {
return SDPATH;
}

public FileUtils() {
// 得到当前外部存储设备的目录
// /SDCARD
SDPATH = Environment.getExternalStorageDirectory() + "/";
}

/**
* 在SD卡上创建文件
*
* @throws IOException
*/
public File creatSDFile(String fileName) throws IOException {
File file = new File(SDPATH + fileName);
file.createNewFile();
return file;
}

/**
* 在SD卡上创建目录
*
* @param dirName
*/
public File creatSDDir(String dirName) {
File dir = new File(SDPATH + dirName);
dir.mkdir();
return dir;
}

/**
* 判断SD卡上的文件夹是否存在
*/
public boolean isFileExist(String fileName) {
File file = new File(SDPATH + fileName);
return file.exists();
}

/**
* 将一个InputStream里面的数据写入到SD卡中
*/
public File write2SDFromInput(String path, String fileName,
InputStream input) {
File file = null;
OutputStream output = null;
try {
creatSDDir(path);
file = creatSDFile(path + fileName);
output = new FileOutputStream(file);
byte buffer[] = new byte[4 * 1024];
while ((input.read(buffer)) != -1) {
output.write(buffer);
}
output.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return file;
}

/**
* 将一个String里面的数据写入到SD卡中
*/
public File write2SDFromInput(String path, String fileName, String input) {
File file = null;
OutputStream output = null;
try {
creatSDDir(path);
file = creatSDFile(path + fileName);
output = new FileOutputStream(file);
output.write(input.getBytes());
output.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
output.close();
} catch (Exception e) {
e.printStackTrace();
}
}
return file;
}
/*
* 写入到内部存储，只需要传文件名如：a.html
* */
public void write2InnerStorage(String path, String str, Context context) {
try {
File file = context.getDir(path, Context.MODE_PRIVATE);
file.mkdirs();
//
// FileOutputStream fos =
// context.getApplicationContext().openFileOutput(path,Context.MODE_PRIVATE);
// fos.write(str.getBytes());
// fos.flush();
// fos.close();

file = new File(context.getFilesDir(), path);
FileOutputStream fos = new FileOutputStream(file);

fos.write(str.getBytes());
fos.flush();
fos.close();

} catch (Exception e) {
e.printStackTrace();
}
}
/*
* 从内部存储读取，只需要传文件名如：a.html
* */
public String readInnerFile(String path, Context context) {
try {
FileInputStream fis = context.openFileInput(path);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] data = new byte[1024];
int len = -1;
while ((len = fis.read(data)) != -1) {
baos.write(data, 0, len);
}
return new String(baos.toByteArray());
} catch (Exception e) {
e.printStackTrace();
}
return "";
}
}

项目是原生代码和html js相互调用，而且要弄成lib项目，

lib项目可以打包assets，但是无法调用；于是我保存成字符串，然后写到sd卡，loadurl（sd卡位置）这样可以；但是可能有人没有sd卡；于是想到写到内部卡；

找了好多代码都不对，终于。。。对了。