搭建项目基础框架

一、设计全局配置器

依照“单例模式”下的“懒汉式”，通过枚举类和静态内部类来实现，保证线程安全，也避免使用双重校验锁。

1. public class Configurator

该类用于配置文件的存储和获取，包括各种配置项（如，后端主机地址）、字体图标库的引用、用于线程通信的全局Handler。

import android.os.Handler;

import com.blankj.utilcode.util.Utils;
import com.joanzapata.iconify.IconFontDescriptor;
import com.joanzapata.iconify.Iconify;

import java.util.ArrayList;
import java.util.HashMap;

public class Configurator {

    private static final HashMap<Object,Object> QILU_CONFIGS= new HashMap<>();
    private static final Handler HANDLER = new Handler();
    private static final ArrayList<IconFontDescriptor> ICONS = new ArrayList<>();
    
    // 不让其他类创建本类的对象
    private Configurator(){
        QILU_CONFIGS.put(ConfigKeys.CONFIG_READY, false);
        QILU_CONFIGS.put(ConfigKeys.HANDLER, HANDLER);
    }
    
    //利用静态内部类进行初始化
    private static class Holder {
        private static final Configurator INSTANCE = new Configurator();
    }

    static Configurator getInstance() {
        return Holder.INSTANCE;
    }

    final HashMap<Object, Object> getQiluConfigs() {
        return QILU_CONFIGS;
    }

    public final void configure() {
        initIcons();
        QILU_CONFIGS.put(ConfigKeys.CONFIG_READY, true);
        Utils.init(Qilu.getApplicationContext());
    }

    private void initIcons() {
        if (ICONS.size() > 0) {
            final Iconify.IconifyInitializer initializer = Iconify.with(ICONS.get(0));
            for (int i = 1; i < ICONS.size(); i++) {
                initializer.with(ICONS.get(i));
            }
        }
    }

    public final Configurator withIcon(IconFontDescriptor descriptor) {
        ICONS.add(descriptor);
        return this;
    }
    public final Configurator withApiHost(String host) {
        QILU_CONFIGS.put(ConfigKeys.API_HOST, host);
        return this;
    }
    public final Configurator withLoaderDelayed(long delayed) {
        QILU_CONFIGS.put(ConfigKeys.LOADER_DELAYED, delayed);
        return this;
    }

    private void checkConfiguration() {
        final boolean isReady = (boolean) QILU_CONFIGS.get(ConfigKeys.CONFIG_READY);
        if (!isReady) {
            throw new RuntimeException("Configuration is not ready,call configure");
        }
    }
    @SuppressWarnings("unchecked")
    final <T> T getConfiguration(Object key) {
        checkConfiguration();
        final Object value = QILU_CONFIGS.get(key);
        if (value == null) {
            throw new NullPointerException(key.toString() + " IS NULL");
        }
        return (T) QILU_CONFIGS.get(key);
    }
}

2. public final class Qilu

该类仅仅是对外提供操作的工具类，全部是静态方法。

import android.content.Context;
import android.os.Handler;

public final class Qilu {
    //初始化
    public static Configurator init(Context context) {
        Configurator.getInstance()
                .getQiluConfigs()
                .put(ConfigKeys.APPLICATION_CONTEXT, context.getApplicationContext());
        return Configurator.getInstance();
    }
    public static Configurator getConfigurator() {
        return Configurator.getInstance();
    }

    public static <T> T getConfiguration(Object key) {
        return getConfigurator().getConfiguration(key);
    }

    public static Context getApplicationContext() {
        return getConfiguration(ConfigKeys.APPLICATION_CONTEXT);
    }
    public static Handler getHandler() {
        return getConfiguration(ConfigKeys.HANDLER);
    }
}

二、字体图标库的集成

App使用字体图标库来代替许多图片。
App使用很多图片有许多缺陷：App体积过大；屏幕分辨率变化时，图片很难保持高保真。
App使用字体图标库，可以显著减小App的体积，因为字体图标可以实时渲染，无需大量静态存储空间。App使用字体图标，即便屏幕分辨率大幅变化，字体图标也不会失真，因为字体图标基于SVG（可缩放的矢量图形）。

1. 添加依赖

GitHub链接：android-iconify
在core模块的build.gradle中添加以下内容：

api 'com.joanzapata.iconify:android-iconify-fontawesome:2.2.2'
api 'com.joanzapata.iconify:android-iconify-entypo:2.2.2'
api 'com.joanzapata.iconify:android-iconify-typicons:2.2.2'
api 'com.joanzapata.iconify:android-iconify-material:2.2.2'
api 'com.joanzapata.iconify:android-iconify-material-community:2.2.2'
api 'com.joanzapata.iconify:android-iconify-meteocons:2.2.2'
api 'com.joanzapata.iconify:android-iconify-weathericons:2.2.2'
api 'com.joanzapata.iconify:android-iconify-simplelineicons:2.2.2'
api 'com.joanzapata.iconify:android-iconify-ionicons:2.2.2'

同步项目

2. 在Configurator中添加初始化方法

private static final ArrayList<IconFontDescriptor> ICONS = new ArrayList<>();

public final Configurator withIcon(IconFontDescriptor descriptor) {
        ICONS.add(descriptor);
        return this;
}

private void initIcons() {
        if (ICONS.size() > 0) {
            final Iconify.IconifyInitializer initializer = Iconify.with(ICONS.get(0));
            for (int i = 1; i < ICONS.size(); i++) {
                initializer.with(ICONS.get(i));
                }
        }
}

三、基础框架可用性验证

验证所搭建的基础框架是否生效

1. 主Application中执行初始化操作

import android.app.Application;

import com.joanzapata.iconify.fonts.EntypoModule;
import com.joanzapata.iconify.fonts.FontAwesomeModule;
import com.joanzapata.iconify.fonts.IoniconsModule;
import com.joanzapata.iconify.fonts.MaterialCommunityModule;
import com.joanzapata.iconify.fonts.MaterialModule;
import com.joanzapata.iconify.fonts.MeteoconsModule;
import com.joanzapata.iconify.fonts.SimpleLineIconsModule;
import com.joanzapata.iconify.fonts.TypiconsModule;
import com.joanzapata.iconify.fonts.WeathericonsModule;
import com.qilu.core.app.Qilu;


public class MainApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Qilu.init(this)
                .withIcon(new FontAwesomeModule())
                .withIcon(new EntypoModule())
                .withIcon(new TypiconsModule())
                .withIcon(new MaterialModule())
                .withIcon(new MaterialCommunityModule())
                .withIcon(new MeteoconsModule())
                .withIcon(new WeathericonsModule())
                .withIcon(new SimpleLineIconsModule())
                .withIcon(new IoniconsModule())
                .withApiHost("http://106.13.96.60:8888/")
                .withLoaderDelayed(3000)
                .configure();
    }
}

2. 在测试页面中查看效果

在测试页面的布局文件中使用了字体图标

<com.joanzapata.iconify.widget.IconTextView
    android:text="I {fa-heart-o} to {fa-code} on {fa-android}"
    android:shadowColor="#22000000"
    android:shadowDx="3"
    android:shadowDy="3"
    android:shadowRadius="1"
    android:textSize="40sp"
    android:textColor="#FF..."
    ... />

运行结果