讀取資料(read file from internal storage)：read()

//取得檔名
String fileName = "test";
int readed; //已讀取的位元數
String content=""; //內容
byte[] buff = new byte[256]; //input stream buffer
//Input stream
try{
 FileInputStream reader = openFileInput(fileName);
 while((readed = reader.read(buff))!=-1){
  content+=new String(buff).trim();
 }
}catch(FileNotFoundException e){
 e.printStackTrace();
}catch (IOException e){
 e.printStackTrace();
}