这次会把所有之前学过的东西应用在一起，写一个登入的功能。

 

1. Activity调用CONFIG，获得URL后

2. Activity再调用Okhttp，从服务器返回JSON

3. Activity调用GsonTools，把JSON转换成<List>DTO

4. Activity调用DAO的get、set方法，把叁数<List>DTO传到方法

5. DAO继承DbHelper，把<List>DTO储存到Sqlite

 

以下是部份代码的精要

1. Activity初始化GsonTools、OkHttp、DAO。

private OkHttp okhttp;    private GsonTools gsonTools;    private BitMap bitMap;    private UserDAO userDAO;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);        setContentView(R.layout.activity_login);        okhttp = OkHttp.getInstance();        gsonTools = GsonTools.getInstance();        bitMap = BitMap.getInstance();        userDAO = new UserDAO(this);        initUI();        isHavingUserInSqlite();    }

2. 必须在新线程下调用Okhttp，而在该线程下想刷新UI，必须用runOnUiThread()。

// Network thread        new Thread(new Runnable() {            @Override            public void run() {                                // run your code here                // UI Thread                LoginActivity.this.runOnUiThread(new Runnable() {                    public void run() {                        // ui                    }                });            }        }).start();

3. 最核心的业务都在这里。

private void validUser() {        // Network thread        new Thread(new Runnable() {            @Override            public void run() {                ResultDTO resultDTO;                // check weather user is exist?                userExistURL = Configuration.isUserExistURL(userName, userPassword);                userExistResult = okhttp.getResponse(userExistURL);                resultDTO = gsonTools.getLogin(userExistResult);                // get user info if user is exist                if ( resultDTO.getResult().equals("1") ) {                    userGetURL = Configuration.getUserURL(resultDTO.getId());                    userResult = okhttp.getResponse(userGetURL);                    userDTO = gsonTools.getUser(userResult);                    // save user info into SQlite                    if ( userDAO.setUser(userDTO) )                    {                        intent = new Intent(LoginActivity.this, MainActivity.class);                        startActivity(intent);                    }                } else {                    loginMsg = "密碼或帳號不正確";                }                // UI Thread                LoginActivity.this.runOnUiThread(new Runnable() {                    public void run() {                        tvLoginResult.setText(loginMsg);                    }                });            }        }).start();    }