Note | 研发录之重构

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一、重构项目结构

Step 1. 自定义业务无关的基础类库

  • com.baselib.activity: 封装业务无关的公用逻辑，如后面的BaseActivity代码
  • com.baselib.cache: 缓存数据和图片的处理
  • com.baselib.net: 网络底层封装库
  • com.baselib.ui: 自定义控件
  • com.baselib.utils: 业务无关的公用方法

Step 2. 实际项目中类进行归类划分

  • com.myapp.activity: 所有的Activity，其他三大组件同样如此
  • com.myapp.adapter: 所有的适配器
  • com.myapp.entity: 实体类
  • com.myapp.db: SQLite相关的逻辑封装
  • com.myapp.engine: 业务相关的类
  • com.myapp.ui: 自定义控件
  • com.myapp.utils: 工具类
  • com.myapp.interfaces: 接口，以I作为开头
  • com.myapp.listener: 基于Listener的接口，命名以On作为开头

二、Activity 模板

1. com.baselib.activity.BaseActivity

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public abstract class BaseActivity extends Activity {
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initVariables();
        initViews(savedInstanceState);
        loadData();
    }
    // 初始化变量，包括Intent带的数据和Activity内的变量
    protected abstract void initVariables();
    // 加载layout布局文件，初始化控件，为控件挂上事件方法
    protected abstract void initViews(Bundle savedInstanceState);
    // 获取数据
    protected abstract void loadData();
}

2. com.myapp.activity.LoginActivity

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public class LoginActivity extends BaseActivity {
    private int loginTimes;
    private String strEmail;
    private EditText etPassword;
    private EditText etEmail;
    private Button btnLogin;
    @Override
    protected void initVariables() {
        loginTimes = -1;
        Bundle bundle = getIntent().getExtras();
        strEmail = bundle.getString(AppConstants.Email);	
    }
    protected void initViews(Bundle savedInstanceState) {
        setContentView(R.layout.activity_login);
        etEmail = (EditText) findViewById(R.id.email);
        etEmail.setText(strEmail);
        etPassword = (EditText) findViewById(R.id.password);
        // 登录事件
        btnLogin = (Button) findViewById(R.id.sign_in_button);
        btnLogin.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    gotoLoginActivity();
                }
            });
    }
    private void gotoLoginActivity() {
        startActivity(new Intent(LoginActivity.this, PersonCenterActivity.class));
    }
    @Override
    protected void loadData() {
        loadWeatherData();
        loadCityData();
    }
    ...
}

三、Adapter 模板

com.myapp.adapter.WeatherAdapter

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public class WeatherAdapter extends BaseAdapter {
    private final ArrayList<WeatherInfo> weatherList;
    private final BaseActivity context;
    public WeatherAdapter(ArrayList<WeatherInfo> weatherList, BaseActivity context) {
        this.weatherList = weatherList;
        this.context = context;
    }
    public int getCount() {
        return weatherList.size();
    }
    public WeatherInfo getItem(final int position) {
        return weatherList.get(position);
    }
    public long getItemId(final int position) {
        return position;
    }
    public View getView(final int position, View convertView, final ViewGroup parent) {
        final Holder holder;
        if (convertView == null) {
            holder = new Holder();
            convertView = context.getLayoutInflater().inflate(R.layout.item_weatherlist, null);
            holder.tvCity = (TextView) convertView.findViewById(R.id.tvCity);
            convertView.setTag(holder);
        } else {
        	holder = (Holder) convertView.getTag();
        }
        WeatherInfo weatherInfo = weatherList.get(position);
        holder.tvCity.setText(weatherInfo.getCity());
        return convertView;
    }
    class Holder {
        TextView tvCity;
    }
}

ListDemoActivity.onCreate()

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lvWeatherList = (ListView) findViewById(R.id.lvWeatherlist);
WeatherAdapter adapter = new WeatherAdapter(weatherList, ListDemoActivity.this);
lvWeatherList.setAdapter(adapter);
lvWeatherList.setOnItemClickListener(
    new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            // do something...
        }
    });

四、实体化编程

1. JSON 数据

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{ "weatherinfo":{
    "city":"北京",
    "cityid":"101010100",
    "temp":"24",
    "WD":"南风",
    "SD":"74%",
    "time":"17:45"
  }
}

2. 生成实体类

可以使用插件，也可以使用公开的工具，如包建强提供的实体生成器下载地址

3. 序列化

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public class Weatherinfo implements Serializable {
    private static final long serialVersionUID = 1L;
    private String city;
    private String cityid;
    private String temp;
    private String WD;
    private String SD;
    private String time;
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    ...
}

4. fastJSON

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WeatherEntity weatherEntity = JSON.parseObject(jsonContent, WeatherEntity.class);
WeatherInfor weatherInfor = weatherEntity.getWeatherInfo();
if (weatherInfor != null) {
    tvCity.setText(weatherInfo.getCity());
}

如果使用崩溃，试下在混淆文件中加以下两行:

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-keepattributes Signature     // 避免混淆泛型
-keepattributes *Annotation*  // 不混淆注解

5. 传递

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intent.putExtra(AppContants.Weather, weatherInfo);

五、类型安全转换函数

valueOf

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public final static int convertToInt(Object value, int defaultValue) {
    if (value == null || "".equals(value.toString().trim())) {
        return defaultValue;
    }
    try {
        return Integer.valueOf(value.toString());
    } catch (Exception e) {
        try {
            return Double.valueOf(value.toString()).intValue();
        } catch (Exception e) {
            return defaultValue;
        }
    }
}

substring

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String cityName = "T";
String firstLetter = "";
if (cityName.length() > 1) {
    firstLetter = cityName.substring(1, 2);
}