android文件讀取需要異步嗎？

string buffer buffer = new string buffer()；try { file inputstream fis = new file inputstream("/SD card/XXX . txt ")；InputStreamReader ISR = new InputStreamReader(fis，“GB 2312”)；//文件編碼unicode，utf-8，ascii，gb2312，big 5 reader in = new buffered reader(ISR)；int chwhile((ch = in . read())& gt；-1){ buffer . append((char)ch)；} in . close()；TV . settext(buffer . tostring())；//buffer.toString())是讀取內容字符} catch(io exception e){ TV . settext("文件不存在！") }

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