Android文件读写

android 读写文件数据 Demo：

public class HolderFile {

final String sFileName="android_info.csv";

//创建并写入

public void createFile(String info) {

File root = Environment.getExternalStorageDirectory();

File file = new File(root, sFileName);

try {

FileWriter Writer = new FileWriter(file);

//String str = "FileDemo";

Writer.write(info);

Writer.flush();

Writer.close();

} catch (IOException e) {

e.printStackTrace();

}

}

//读取资料

public String read() {

String content = null;

File root = Environment.getExternalStorageDirectory();

File file = new File(root, sFileName);

try {

if (file.exists()) {

FileInputStream fis = new FileInputStream(file);

byte[] buffer = new byte[1024];

ByteArrayOutputStream baos = new ByteArrayOutputStream();

int len = 0;

while ((len = fis.read(buffer)) != -1) {

baos.write(buffer, 0, len);

}

byte[] data = baos.toByteArray();

baos.close();

fis.close();

content = new String(data);

}

} catch (Exception e) {

// TODO: handle exception

e.printStackTrace();

}

return content;

}

public boolean isFileExist() {

File file = new File(Environment.getExternalStorageDirectory() + "/"

+ sFileName);

return file.exists();

}

public boolean delFile() {

File file = new File(Environment.getExternalStorageDirectory() + "/"

+ sFileName);

return file.delete();

}

}