Android解析Asset目录下的json文件

在app module中的src/main/assets目录下我们准备了两个json文件：

destination.json如下：

{
  "main/tabs/sofa": {
    "isFragment": true,
    "asStarter": false,
    "needLogin": false,
    "pageUrl": "main/tabs/sofa",
    "className": "com.test.ppjoke.ui.notifications.NotificationsFragment",
    "id": 448706824
  },
  "main/tabs/dash": {
    "isFragment": true,
    "asStarter": false,
    "needLogin": false,
    "pageUrl": "main/tabs/dash",
    "className": "com.test.ppjoke.ui.dashboard.DashboardFragment",
    "id": 938694224
  },
  "main/tabs/home": {
    "isFragment": true,
    "asStarter": true,
    "needLogin": false,
    "pageUrl": "main/tabs/home",
    "className": "com.test.ppjoke.ui.home.HomeFragment",
    "id": 509754652
  },
  "main/tabs/my": {
    "isFragment": true,
    "asStarter": false,
    "needLogin": false,
    "pageUrl": "main/tabs/my",
    "className": "com.test.ppjoke.ui.my.MyFragment",
    "id": 750793084
  }
}

对应的destination的javabean文件：

public class Destination {
    public String pageUrl;
    public int id;
    public boolean needLogin;
    public boolean asStarter;
    public boolean isFragment;
    public String className;
}

 main_tabs_config.json如下：

{
  "activeColor": "#333333",
  "inActiveColor": "#666666",
  "selectTab": 0,
  "tabs": [
    {
      "size": 24,
      "enable": true,
      "index": 0,
      "pageUrl": "main/tabs/home",
      "title": "首页"
    },
    {
      "size": 24,
      "enable": true,
      "index": 1,
      "pageUrl": "main/tabs/sofa",
      "title": "沙发"
    },
    {
      "size": 40,
      "enable": true,
      "index": 2,
      "tintColor": "#ff678f",
      "pageUrl": "main/tabs/publish",
      "title": ""
    },
    {
      "size": 24,
      "enable": true,
      "index": 3,
      "pageUrl": "main/tabs/dash",
      "title": "发现"
    },
    {
      "size": 24,
      "enable": true,
      "index": 4,
      "pageUrl": "main/tabs/my",
      "title": "我的"
    }
  ]
}

main_tabs_config.json对应的JavaBean BottomBar如下：

import java.util.List;

public class BottomBar {

    /**
     * activeColor : #333333
     * inActiveColor : #666666
     * tabs : [{"size":24,"enable":true,"index":0,"pageUrl":"main/tabs/home","title":"首页"},{"size":24,"enable":true,"index":1,"pageUrl":"main/tabs/sofa","title":"沙发"},{"size":40,"enable":true,"index":2,"tintColor":"#ff678f","pageUrl":"main/tabs/publish","title":""},{"size":24,"enable":true,"index":3,"pageUrl":"main/tabs/find","title":"发现"},{"size":24,"enable":true,"index":4,"pageUrl":"main/tabs/my","title":"我的"}]
     */

    public String activeColor;
    public String inActiveColor;
    public List<Tab> tabs;
    public int selectTab;//底部导航栏默认选中项

    public static class Tab {
        /**
         * size : 24
         * enable : true
         * index : 0
         * pageUrl : main/tabs/home
         * title : 首页
         * tintColor : #ff678f
         */

        public int size;
        public boolean enable;
        public int index;
        public String pageUrl;
        public String title;
        public String tintColor;
    }
}

读取json并解析的java代码：

import android.content.res.AssetManager;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.test.ppjoke.model.BottomBar;
import com.test.ppjoke.model.Destination;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;

public class AppConfig {
    private static HashMap<String, Destination> sDestConfig;
    private static BottomBar sBottomBar;

    public static HashMap<String, Destination> getDestConfig() {
        if (sDestConfig == null) {
            String content = parseFile("destination.json");
            sDestConfig = JSON.parseObject(content, new TypeReference<HashMap<String, Destination>>() {
            });
        }
        return sDestConfig;
    }

    public static BottomBar getBottomBarConfig() {
        if (sBottomBar == null) {
            String content = parseFile("main_tabs_config.json");
            sBottomBar = JSON.parseObject(content, BottomBar.class);
        }
        return sBottomBar;
    }

    private static String parseFile(String fileName) {
        AssetManager assets = AppGlobals.getApplication().getAssets();
        InputStream is = null;
        BufferedReader br = null;
        StringBuilder builder = new StringBuilder();
        try {
            is = assets.open(fileName);
            br = new BufferedReader(new InputStreamReader(is));
            String line = null;
            while ((line = br.readLine()) != null) {
                builder.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
                if (br != null) {
                    br.close();
                }
            } catch (Exception e) {

            }
        }

        return builder.toString();
    }
}

工具类appGlobals.java：

import android.app.Application;

import java.lang.reflect.InvocationTargetException;

/**
 * 这种方式获取全局的Application 是一种拓展思路。
 * <p>
 * 对于组件化项目,不可能把项目实际的Application下沉到Base,而且各个module也不需要知道Application真实名字
 * <p>
 * 这种一次反射就能获取全局Application对象的方式相比于在Application#OnCreate保存一份的方式显示更加通用了
 */
public class AppGlobals {
    private static Application sApplication;

    public static Application getApplication() {
        if (sApplication == null) {
            try {
                sApplication = (Application) Class.forName("android.app.ActivityThread")
                        .getMethod("currentApplication")
                        .invoke(null, (Object[]) null);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
        }
        return sApplication;
    }
}