File file=new File(Environment.getExternalStorageDirectory(), name);

                                                  try {

                                                            FileOutputStream   fos=new FileOutputStream(file);

                                                            fos.write(content.getBytes());

                                                            fos.close();

                                                               Toast.makeText(getApplicationContext(), "保存成功", 200).show();

                                                  }  catch (Exception e) {

                                                               Toast.makeText(getApplicationContext(), "保存失败", 200).show();

                                                            e.printStackTrace();

                                                  }

File file=new File(Environment.getExternalStorageDirectory(), name);

                                                  try {

                                                            FileOutputStream   fos=new FileOutputStream(file);

                                                            fos.write(content.getBytes());

                                                            fos.close();

                                                               Toast.makeText(getApplicationContext(), "保存成功", 200).show();

                                                  }  catch (Exception e) {

                                                               Toast.makeText(getApplicationContext(), "保存失败", 200).show();

                                                            e.printStackTrace();

                                                  }

       btn_ok.setOnClickListener(new OnClickListener() {

                              @Override

                              public void onClick(View v) {

                                                  String  user = et_user.getText().toString().trim();

                                                  String  pwd = et_pwd.getText().toString().trim();

                                                  if(user.isEmpty()||pwd.isEmpty()){

                                                            Toast.makeText(getApplicationContext(), "不能为空", 200).show();

                                                            //获取编辑器

                                                     Editor edit = sp.edit();

                                                                 //保存数据

                                                     edit.putString("name", user);

                                                     edit.putString("pwd", pwd);

                                                     //提交保存

                                                     edit.commit();          

                                                  }                                        

                              }

                    });