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private String read(){
try{
FileInputStream fis = openFileInput(FILE_NAME);
byte[] buff = new byte[1024];
int hasRead = 0;
StringBuilder sb = new StringBuilder("");
while((hasRead = fis.read(buff)) > 0){
sb.append(new String(buff, 0, hasRead));
}
fis.close();
return sb.toString();
}
catch(Exception e){
e.printStackTrace();
}
return null;
}
private void write(String content){
try{
FileOutputStream fos = openFileOutput(FILE_NAME, MODE_APPEND);
PrintStream ps = new PrintStream(fos);
ps.println(content);
ps.close();
}
catch(Exception e){
e.printStackTrace();
}
}