android写文件不会乱码的方法

android写文件不会乱码的方法

String filePath  =   " /sdcard/utf8_file.txt " ;
String UTF8  =   " utf8 " ;
int  BUFFER_SIZE  =   8192 ;

BufferedReader br  =   new  BufferedReader( new  InputStreamReader( new  FileInputStream(filePath), UTF8),BUFFER_SIZE);
BufferedWriter bw  =   new  BufferedWriter( new  OutputStreamWriter( new  FileOutputStream(filePath), UTF8),BUFFER_SIZE);