Android, File memo

** File 확장자

String fileName = "a.txt";

if(fileName.endsWith("txt")){
    // do something
}



** File Size

File file = ..
long fileSize = file.length();


** File read bytes

FileInputStream in = new FileInputStream(file);

int len = 0;

do{

    len = in.read(buffer);

}while(len!= -1);