解读(二):从简单的类开始

解读(二):从简单的类开始

AppManager类

/** * 应用程序入口 */public class AppManager extends Application {    public static Context context;    public static Resources resources;    public static SharedPreferences preferences;    public static User LOCAL_LOGINED_USER; //记录登录的用户    public static final String BUNDLE_TYPE = "BUNDLE_TYPE";    @Override    public void onCreate() {        super.onCreate();        context = getApplicationContext();        resources = getResources();        //以包名作为SharePreference的文件名        preferences = getSharedPreferences(context.getPackageName(), MODE_PRIVATE);        //使用LeakCanary做内存泄露检查        //LeakCanary.install(this);    }    /**     * 获得包信息     */    public static PackageInfo getPackageInfo() {        try {            //包信息都记录在PackageManager中            return context.getPackageManager().getPackageInfo(context.getPackageName(), 0);        } catch (PackageManager.NameNotFoundException e) {            throw new RuntimeException(e);        }    }    /**     * 判断是否登录     */    public static boolean isLogined() {        return LOCAL_LOGINED_USER != null;    }}

• 说明:
  
  • AppManager类中保存了一个静态变量LOCAL_LOGINED_USER保存已登录的用户.

StartActivity类

/** * 启动页面 */public class StartActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        //因为在主题Theme.AppStart中设置了android:windowBackground图片,这里没内容        setContentView(R.layout.activity_start);        //从SharePreference中登录用户        loadLocalUser();        //使用postDelayed延迟2s进入MainActivity        new Handler().postDelayed(() -> {            startActivity(new Intent(StartActivity.this, MainActivity.class));            finish();        }, 2000);    }    /**     * 从SharePreference登录用户     */    private void loadLocalUser() {        SharedPreferences preferences = SharePreferenceManager.getLocalUser(this);        // 首先是否有登录记录        boolean isLogin = preferences.getBoolean(LocalUser.KEY_LOGIN_STATE, false);        if (!isLogin)            return;        // 其次,登录记录是否过期        long lastLoginTime = preferences.getLong(LocalUser.KEY_LAST_LOGIN_TIME, -1);        if (lastLoginTime == -1)            return;        //登录过期时间为30天        if (new Date().getTime() - lastLoginTime > 30L * 24 * 60 * 60 * 1000)            return;        // 验证信息是否完善        User user = new User();        user.setUid(preferences.getLong(LocalUser.KEY_UID, -1));//UID        if (user.getUid() == -1)            return;        user.setName(preferences.getString(LocalUser.KEY_NICK, null));//昵称        if (user.getName() == null)            return;        user.setPortrait(preferences.getString(LocalUser.KEY_PORTRAIT, null));//头像        if (user.getPortrait() == null)            return;        user.setAccount(preferences.getString(LocalUser.KEY_USERNAME, null));//账号        if (user.getAccount() == null)            return;        user.setPwd(preferences.getString(LocalUser.KEY_PASSWORD, null));//密码        if (user.getPwd() == null)            return;        user.setGender(preferences.getString(LocalUser.KEY_GENDER, null)); //性别        user.setScore(preferences.getInt(LocalUser.KEY_SKILL_SCORE, 0));//积分        AppManager.LOCAL_LOGINED_USER = user; //使用AppManager静态变量保存登录用户    }}

• 说明:
  
  • handler.postDelayed()方法使用了Lambda表达式.

new Handler().postDelayed(() -> {            startActivity(new Intent(StartActivity.this, MainActivity.class));            finish();        }, 2000);

项目中其他地方也大量使用了Lambda表达式, 这是java 8推出的新特性. 目前Android本身是不支持的. 好像在Android Studio 2.1之后支持了, 但是我没用过. 因此这里要在build.gradle中引入了retrolambda依赖.

• 在build.gradle中加入编译的依赖，这会使用retrolambda来编译Java代码

buildscript {    dependencies {        classpath 'me.tatarka:gradle-retrolambda:3.2.4'    }}

• 同时要加入plugin声明

apply plugin: 'me.tatarka.retrolambda'

• 加入compileOptions,这会让IDE使用用JAVA8语法解析

compileOptions {    sourceCompatibility JavaVersion.VERSION_1_8    targetCompatibility JavaVersion.VERSION_1_8}

• 指定将源码编译的级别,，使用下列代码，会将代码编译到兼容1.6的字节码格式

retrolambda {    javaVersion JavaVersion.VERSION_1_6}

参考自:android上的JAVA8：使用retrolambda
简单的Lambda入门:使用Lambda在Android中的替代匿名类

SharePreferenceManager类

/** * SharePreference管理类, oop管理众多的首选项文件 */public class SharePreferenceManager {    /**     * 获得应用的配置,目前主要是白天黑夜模式     */    public static SharedPreferences getApplicationSetting(Context context) {        return context.getSharedPreferences(ApplicationSetting.FILE_NAME, Context.MODE_PRIVATE);    }    /**     * 获得登录用户信息     */    public static SharedPreferences getLocalUser(Context context) {        return context.getSharedPreferences(LocalUser.FILE_NAME, Context.MODE_PRIVATE);    }    /**     * 应用配置首选项, 保存主题...一些系统级别的配置     */    public static class ApplicationSetting {        public static final String FILE_NAME = "APPLICATION_SETTING";//应用配置        public static final String KEY_THEME = "KEY_THEME"; //主题        //应用主题的枚举        public enum ApplicationTheme {            LIGHT(1, R.style.LightTheme), //白天            DARK(2, R.style.DarkTheme); //黑夜            private int key;            private int resId;            ApplicationTheme(int key, int resId) {                this.key = key;                this.resId = resId;            }            public int getKey() {                return key;            }            public int getResId() {                return resId;            }        }    }    /**     * 专门保存用户信息     */    public static class LocalUser {        public static final String FILE_NAME = "LOCAL_USER"; //文件名        public static final String KEY_USERNAME = "KEY_USERNAME"; //账号        public static final String KEY_PASSWORD = "KEY_PASSWORD"; //密码        public static final String KEY_GENDER = "KEY_GENDER"; //性别        public static final String KEY_NICK = "KEY_NICK"; //昵称        public static final String KEY_SKILL_SCORE = "KEY_SKILL_SCORE"; //积分        public static final String KEY_UID = "KEY_UID"; //UID唯一标识        public static final String KEY_LAST_LOGIN_TIME = "KEY_LAST_LOGIN_TIME"; //最后登录时间        public static final String KEY_LOGIN_STATE = "KEY_LOGIN_STATE"; //登录记录        public static final String KEY_PORTRAIT = "KEY_PORTRAIT"; //头像        public static final String KEY_COOKIES = "KEY_COOKIES"; //Cookies    }}

• 说明:
  
  • ApplicationTheme是一个枚举类. 枚举是java 5引入的新特性.
  • 使用静态内部类LocalUser管理保存到首选项中的用户信息的key.
• 白天和黑夜的主题颜色设置在values/styles.xml中.

<!--==================light theme==================--> <style name="LightTheme.Base" parent="AppTheme.Base"> //白天主题的Base    <item name="colorPrimary">@color/light_principle</item>    <item name="colorPrimaryDark">@color/light_state_bar</item>    <item name="android:listDivider">@color/light_divider</item>    <item name="hint">@color/light_hint</item>    <item name="horizontal_divider">@color/light_divider</item>    <item name="tab_item_selected">@color/light_tab_item_selected</item>    <item name="tab_item_unselected">@color/light_tab_item_unselected</item>    <item name="tab_item_underline">@color/light_tab_item_underline</item>    <item name="list_view_background">@color/light_list_item_background</item>    <item name="main_list_item_title">@color/light_main_list_item_title</item>    <item name="main_list_item_content">@color/light_main_list_item_title</item>    <item name="main_list_item_username">@color/light_main_list_item_username</item>    <item name="main_list_item_time">@color/light_main_list_item_title</item>    <item name="main_list_item_background">@drawable/selector_light_list_item</item>    <item name="main_list_item_comment_count">@color/light_main_list_item_title</item>    <item name="drawer_header_background">@color/light_drawer_header_background</item>    <item name="drawer_header_username">@color/light_drawer_header_username</item>    <item name="drawer_header_abilities">@color/light_drawer_header_abilities</item>    <item name="drawer_header_abilities_background">@color/light_drawer_header_abilities_background</item>    <item name="drawer_header_skill_score">@color/light_drawer_header_skill_score</item>    <item name="drawer_container_background">@color/light_drawer_container_background</item>    <item name="drawer_container_menu_text">@color/light_drawer_container_menu_text</item>    <item name="drawer_container_menu">@drawable/selector_light_drawer_menu</item>    <item name="func_loading_text">@color/light_func_loading_text</item>    <item name="refresh_progress_background">@color/light_refresh_progress_background</item>    <item name="detail_title_background">@color/light_detail_title_background</item>    <item name="detail_title_text">@color/light_detail_title_text</item>    <item name="detail_header_username">@color/light_detail_header_username</item>    <item name="detail_header_other">@color/light_detail_header_other</item>    <item name="detail_header_background">@color/light_detail_header_background</item>    <item name="detail_content_text">@color/light_detail_content_text</item>    <item name="detail_content_background">@color/light_detail_content_background</item>    <item name="detail_footer_text">@color/light_detail_footer_text</item>    <item name="detail_footer_background">@drawable/selector_light_detail_footer_item</item>    <item name="comment_list_item_username">@color/light_comment_list_item_username</item>    <item name="comment_list_item_time">@color/light_comment_list_item_time</item>    <item name="comment_list_item_content">@color/light_comment_list_item_content</item>    <item name="comment_list_item_background">@drawable/selector_light_list_item</item>    <item name="comment_list_item_refer_background">@drawable/shape_light_refer_item</item>    <item name="comment_list_item_refer_title">@color/light_comment_list_item_refer_title</item>    <item name="comment_list_item_refer_content">@color/light_comment_list_item_refer_content</item>    <item name="comment_list_item_refer_border">@color/light_comment_list_item_refer_border</item>    <item name="keyboard_panel_background">@color/light_keyboard_panel_background</item>    <item name="keyboard_emotion_tab_item_background">@drawable/selector_light_emotion_item</item>    <item name="keyboard_emotion_tab_item_text">@color/light_keyboard_emotion_tab_item_text</item>    <item name="keyboard_input_text">@color/light_keyboard_input_text</item>    <item name="tweet_list_item_username">@color/light_tweet_list_item_username</item>    <item name="tweet_list_item_content">@color/light_tweet_list_item_content</item>    <item name="tweet_list_item_highlight">@color/light_tweet_list_item_highlight</item>    <item name="tweet_list_item_other">@color/light_tweet_list_item_other</item>    <item name="tweet_list_item_background">@drawable/selector_light_list_item</item>    <item name="tweet_list_item_like_list_background">@color/light_tweet_list_item_like_list_background</item>    <item name="tweet_comment_list_item_username">@color/light_tweet_comment_list_item_username</item>    <item name="tweet_comment_list_item_content">@color/light_tweet_comment_list_item_content</item>    <item name="tweet_comment_list_item_time">@color/light_tweet_comment_list_item_time</item>    <item name="tweet_comment_list_item_background">@drawable/selector_light_list_item</item>    <item name="tweet_floating_action_button_background_unselected">@color/light_tweet_floating_action_button_background_unselected</item>    <item name="tweet_floating_action_button_background_selected">@color/light_tweet_floating_action_button_background_selected</item>    <item name="tweet_floating_action_button_plus">@color/light_tweet_floating_action_button_plus</item>    <item name="tweet_floating_action_button_item_background_unselected">@color/light_tweet_floating_action_button_item_background_unselected</item>    <item name="tweet_floating_action_button_item_background_selected">@color/light_tweet_floating_action_button_item_background_selected</item>    <item name="tweet_floating_cover">@color/light_tweet_floating_cover</item>    <item name="login_background">@color/light_login_background</item>    <item name="login_form_username">@color/light_login_form_username</item>    <item name="login_form_password">@color/light_login_form_password</item>    <item name="login_form_hint">@color/light_login_form_hint</item>    <item name="login_form_error">@color/light_login_form_error</item>    <item name="login_text">@color/light_login_text</item>    <item name="dialog_opinion_background">@drawable/selector_light_opinion_item</item>    <item name="dialog_text">@color/light_dialog_text</item>    <item name="tweet_publish_editor_background">@color/light_tweet_publish_editor_background</item>    <item name="tweet_publish_editor_text">@color/light_tweet_publish_editor_text</item>    <item name="tweet_publish_emotion_navigation">@color/light_tweet_publish_emotion_navigation</item>    <item name="user_home_username">@color/light_user_home_username</item>    <item name="user_home_join_time">@color/light_user_home_join_time</item>    <item name="user_home_coordinate">@color/light_user_home_coordinate</item>    <item name="user_home_statistic">@color/light_user_home_statistic</item>    <item name="user_home_statistic_border">@color/light_user_home_statistic_border</item>    <item name="user_home_blow_background">@color/light_user_home_blow_background</item>    <item name="user_home_blow_row">@color/light_user_home_blow_row</item>    <item name="user_home_blow_label">@color/light_user_home_blow_label</item>    <item name="user_home_blow_label_value">@color/light_user_home_blow_label_value</item>    <item name="user_home_blow_label_value_background">@drawable/shape_light_user_home_label_value</item></style><!--======================Dark Theme========================--><style name="DarkTheme.Base" parent="AppTheme.Base">    //配置的属性一样,省略</style><style name="LightTheme" parent="LightTheme.Base" /> //白天主题<style name="DarkTheme" parent="DarkTheme.Base" /> //黑夜主题

• 目前只看到了设置这些属性值, 具体在哪里应用到了, 目前还没读到, 待之后补充.
  //TODO: 找到在哪里需要这些主题属性值的代码

DeviceManager类

/** * 设备管理类 */public class DeviceManager {    private static ConnectivityManager mCnnManager; //网络连接管理    private static InputMethodManager mSoftInputManager; //输入法管理    /**     * 获得网络连接管理对象     */    public static ConnectivityManager getCnnManager(Context context) {        if (mCnnManager == null)            mCnnManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);        return mCnnManager;    }    /**     * 获得输入法管理对象     */    public static InputMethodManager getSoftInputManager(Context context) {        if (mSoftInputManager == null)            mSoftInputManager = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);        return mSoftInputManager;    }    /**     * 获得剪切板管理对象     */    public static ClipboardManager getClipboardManager(Context context) {        return (ClipboardManager) context.getSystemService(Context.CLIPBOARD_SERVICE);    }    /**     * 检测是否有网络. getActiveNetworkInfo()获得NetworkInfo()对象,该类是对网络信息的描述     */    public static boolean hasInternet(Context context) {        return getCnnManager(context).getActiveNetworkInfo() != null && getCnnManager(context).getActiveNetworkInfo().isAvailable();    }    /**     * 网络类型     */    public static int getInternetType(Context context) {        return getCnnManager(context).getActiveNetworkInfo().getType();    }    /**     * 关闭软键盘. getWindowToken()返回的是附加到window上view的唯一标识token.     */    public static void hideSoftInput(Context context, View view) {        if (view == null)            return;        getSoftInputManager(context).hideSoftInputFromWindow(view.getWindowToken(), 0);    }}

BaseActivity类

/** * Activity的基类 */public abstract class BaseActivity<P extends Presenter> extends NucleusActivity<P> {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // 主题选择,从首选项中获得保存的主题        SharedPreferences preferences = SharePreferenceManager.getApplicationSetting(this);        int theme = preferences.getInt(ApplicationSetting.KEY_THEME, ApplicationTheme.LIGHT.getKey());        //使用setTheme()设置白天和黑夜主题        if (theme == ApplicationTheme.LIGHT.getKey()) {            setTheme(ApplicationTheme.LIGHT.getResId());        } else if (theme == ApplicationTheme.DARK.getKey()) {            setTheme(ApplicationTheme.DARK.getResId());        }        // 方向锁定, 设置为垂直方向        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);    }    @Override    protected void onPause() {        super.onPause();        //isFinishing()常用在onPause()中判断activity仅仅是pause还是彻底的finish        if (isFinishing()) {            //隐藏输入法            DeviceManager.hideSoftInput(this, getCurrentFocus());        }    }}

• 说明
  
  • setRequestedOrientation 改变当前activity的屏幕朝向
    // TODO: 目前对MVP模式不是太熟悉, 等以后完成架构分析