MVC模式

• Model：代表一個數(shù)據(jù)對象也切±资眩可以帶一些邏輯倒槐，在數(shù)據(jù)變化時更新控制器葵萎。
• View：數(shù)據(jù)的可視化
• Controller：控制數(shù)據(jù)流向模型對象唱凯，并在數(shù)據(jù)變化時更新視圖卷雕。

View

在Android中視圖層被封裝成了XML文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  android:padding="8dp">
  
  <View
  ......../>

</LinearLayout>

Controller

在Android中控制層也就是Activity

public class MainActivity extends ActionBarActivity implements OnWeatherListener, View.OnClickListener {

    private WeatherModel weatherModel;
    private Dialog loadingDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        weatherModel = new WeatherModelImpl();
        initView();
    }

    /**
     * 初始化View
     */
    private void initView() {
        cityNOInput = findView(R.id.et_city_no);
        city = findView(R.id.tv_city);
        
        loadingDialog = new ProgressDialog(this);
        loadingDialog.setTitle("加載天氣中...");
    }

    /**
     * 顯示結(jié)果
     *
     * @param weather
     */
    public void displayResult(Weather weather) {
        WeatherInfo weatherInfo = weather.getWeatherinfo();
        city.setText(weatherInfo.getCity());
        njd.setText(weatherInfo.getNjd());
    }

    /**
     * 隱藏進度對話框
     */
    public void hideLoadingDialog() {
        loadingDialog.dismiss();
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_go:
                loadingDialog.show();
                weatherModel.getWeather(cityNOInput.getText().toString().trim(), this);
                break;
        }
    }

    @Override
    public void onSuccess(Weather weather) {
        hideLoadingDialog();
        displayResult(weather);
    }

    @Override
    public void onError() {
        hideLoadingDialog();
        Toast.makeText(this, "獲取天氣信息失敗", Toast.LENGTH_SHORT).show();
    }

}

Model層

指數(shù)據(jù)來源，Android中目前一般指網(wǎng)絡(luò)請求返回的數(shù)據(jù)，大多時候這是已經(jīng)被封裝好的一層速缨。

public interface OnWeatherListener {
    void onSuccess(Weather weather);
    void onError();
}

public interface WeatherModel {
    void getWeather(String cityNumber, OnWeatherListener listener);
}

public class WeatherModelImpl implements WeatherModel {
    @Override
    public void getWeather(String cityNumber, final OnWeatherListener listener) {
        /*數(shù)據(jù)層操作*/
        VolleyRequest.newInstance().newGsonRequest("http://www.weather.com.cn/data/sk/" + cityNumber + ".html",
                Weather.class, new Response.Listener<Weather>() {
                    @Override
                    public void onResponse(Weather weather) {
                        if (weather != null) {
                            listener.onSuccess(weather);
                        } else {
                            listener.onError();
                        }
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        listener.onError();
                    }
                });
    }
}

個人評價

在MVC的設(shè)計架構(gòu)中捡偏，Activity做為Controller本身的作用是鏈接Model和View的紐帶峡迷，其本身不會負責(zé)太多的職責(zé)，但是實際使用過程中彤避，Activity本身還要處理響應(yīng)用戶的操作夯辖，隨著頁面交互的復(fù)雜性增加，Activity中的代碼也會變得十分臃腫蒿褂。