btn_ok.setOnClickListener(newOnClickListener() {

          @Override

         publicvoidonClick(View v) {

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

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

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

                 Toast.makeText(getApplicationContext(),"不能為空", 200).show();

             }else{

                 String name="data.txt";

                 Stringcontent=user+"="+pwd;

// StringBuffer sb = newStringBuffer();

             String content =sb.append(userName).append("=").append(password).toString();

try{

                    FileOutputStream  fos=openFileOutput(name,MODE_PRIVATE);

                    fos.write(content.getBytes());

                    fos.close();

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

                 }catch(Exception e) {

                    //TODOAuto-generated catch block

                    e.printStackTrace();

                 }

             }

          }

btn_show.setOnClickListener(newOnClickListener() {

          @Override

         publicvoidonClick(View v) {

             String name="data.txt";

            try{

                 FileInputStream  fis=openFileInput(name);

                 BufferedReaderbr=newBufferedReader(newInputStreamReader(fis));

                 //讀取文檔的數(shù)據(jù)

                 String content =br.readLine();

                 //拆分字符串

                 String[] strs =content.split("=");

                 //顯示的數(shù)據(jù)

                if(!content.isEmpty()){

                    et_user.setText(strs[0]);

                    et_pwd.setText(strs[1]);

                 }

             }catch(Exception e) {

                 //TODOAuto-generated catch block

                 e.printStackTrace();

             }

          }