写入内部存储：

public Boolean SaveDataToRom(String name, String pwd){        Boolean flag = false;        try{            String content = name+":"+pwd;            FileOutputStream fos = context.openFileOutput("data.txt", Context.MODE_WORLD_WRITEABLE|Context.MODE_WORLD_READABLE);            fos.write(content.getBytes());            fos.flush();            fos.close();            flag = true;        } catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }finally{            return flag;        }            }

 写入sdcard:

public Boolean SaveDataToSDCard(String name, String pwd){        Boolean flag = false;        try{            String content = name+":"+pwd;            if(Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())){                FileOutputStream fos = new FileOutputStream(new File(Environment.getExternalStorageDirectory(),"test.txt"));                fos.write(content.getBytes());                fos.flush();                fos.close();                flag = true;            }else{                return flag;            }                                    } catch (Exception e) {            // TODO: handle exception            e.printStackTrace();        }finally{            return flag;        }            }