add Gson&FastJsonUtils

app/build.gradle

@@ -20,7 +20,9 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile fileTree(include: ['*.jar'], dir: 'libs')
     testCompile 'junit:junit:4.12'
     compile 'com.android.support:appcompat-v7:24.0.0-alpha2'
+    compile 'com.google.code.gson:gson:2.2.4'
+    compile 'com.alibaba:fastjson:1.2.12'
 }

app/src/main/java/com/stay4it/sample/gsonTest/Person.java

@@ -0,0 +1,30 @@
+package com.stay4it.sample.gsonTest;
+
+/**
+ * Created by AndWang on 16/5/24.
+ */
+public class Person {
+    private String firstName;
+    private String lastName;
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    @Override
+    public String toString() {
+        return "Person [firstName=" + firstName + ", lastName=" + lastName + "]";
+    }
+}

app/src/main/java/com/stay4it/sample/gsonTest/Test.java

@@ -0,0 +1,46 @@
+package com.stay4it.sample.gsonTest;
+
+import com.google.gson.reflect.TypeToken;
+import com.stay4it.utilities.io.GsonUtils;
+
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Created by AndWang on 16/5/24.
+ */
+public class Test {
+    public static void main(String[] args) {
+        Person p = new Person();
+        p.setFirstName("xxx");
+        p.setLastName("yyy");
+
+        List<Person> pList = new ArrayList<Person>();
+        pList.add(p);
+
+        String jsonStr = GsonUtils.toJsonList(pList);
+
+        System.out.println("Person List as Json Array = " + jsonStr);
+
+        Type collectionType = new TypeToken<List<Person>>() {
+        }.getType();
+        List<Person> personList = GsonUtils.fromJsonString(jsonStr, collectionType);
+        System.out.println("Person List from json String array = " + personList);
+
+        String personJsonStr = GsonUtils.toJsonObj(p);
+        System.out.println("Json String from person = " + personJsonStr);
+
+        Person p1 = GsonUtils.fromJsonString(personJsonStr, Person.class);
+        System.out.println("Person from json String = " + p1);
+    }
+
+    /**
+     * 最后输出结果
+     * Person List as Json Array = [{"firstName":"xxx","lastName":"yyy"}]
+     * Person List from json String array = [Person [firstName=xxx, lastName=yyy]]
+     * Json String from person = {"firstName":"xxx","lastName":"yyy"}
+     * Person from json String = Person [firstName=xxx, lastName=yyy]
+     * */
+
+}

app/src/main/java/com/stay4it/utilities/common/BeanUtil.java

@@ -0,0 +1,48 @@
+package com.stay4it.utilities.common;
+
+/**
+ * @author peiyu
+ *         对象常用方法工具类的封装
+ */
+public class BeanUtil {
+    /**
+     * 此类不需要实例化
+     */
+    private BeanUtil() {
+    }
+
+    /**
+     * 判断对象是否为null
+     *
+     * @param object 需要判断的对象
+     * @return 是否为null
+     */
+    public static boolean isNull(Object object) {
+        return null == object;
+    }
+
+    /**
+     * 判断对象是否不为null
+     *
+     * @param object 需要判断的对象
+     * @return 是否不为null
+     */
+    public static boolean nonNull(Object object) {
+        return null != object;
+    }
+
+    /**
+     * 判断对象是否为空，如果为空，直接抛出异常
+     *
+     * @param object       需要检查的对象
+     * @param errorMessage 异常信息
+     * @return 非空的对象
+     */
+    public static Object requireNonNull(Object object, String errorMessage) {
+        if (null == object) {
+            throw new NullPointerException(errorMessage);
+        }
+        return object;
+    }
+
+}

app/src/main/java/com/stay4it/utilities/common/DisplayUtils.java

@@ -22,4 +22,20 @@ public static int dip2px(Context context, float dipValue) {
         final float scale = context.getResources().getDisplayMetrics().density;
         return (int) (dipValue * scale + 0.5f);
     }
+
+    /**
+     * 将px值转换为sp值，保证文字大小不变
+     */
+    public static int px2sp(Context context, float pxValue) {
+        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
+        return (int) (pxValue / fontScale + 0.5f);
+    }
+
+    /**
+     * 将sp值转换为px值，保证文字大小不变
+     */
+    public static int sp2px(Context context, float spValue) {
+        final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
+        return (int) (spValue * fontScale + 0.5f);
+    }
 }

app/src/main/java/com/stay4it/utilities/io/FastJsonUtil.java

@@ -0,0 +1,110 @@
+package com.stay4it.utilities.io;
+
+import android.text.TextUtils;
+
+import com.alibaba.fastjson.JSON;
+import com.alibaba.fastjson.JSONObject;
+import com.alibaba.fastjson.serializer.SerializerFeature;
+import com.stay4it.utilities.common.BeanUtil;
+
+import java.util.Map;
+
+/**
+ * @author peiyu.
+ * 基于fastjson封装解析json
+ */
+public class FastJsonUtil {
+    /**
+     * 默认json格式化方式
+     */
+    public static final SerializerFeature[] DEFAULT_FORMAT = {SerializerFeature.WriteDateUseDateFormat, SerializerFeature.WriteEnumUsingToString,
+            SerializerFeature.WriteNonStringKeyAsString, SerializerFeature.QuoteFieldNames, SerializerFeature.SkipTransientField,
+            SerializerFeature.SortField, SerializerFeature.PrettyFormat};
+
+    private FastJsonUtil() {
+    }
+
+    /**
+     * 从json获取指定key的字符串
+     *
+     * @param jsonString json字符串
+     * @param key        字符串的key
+     * @return 指定key的值
+     */
+    public static Object getStringFromJSONObject(String jsonString, String key) {
+        BeanUtil.requireNonNull(jsonString, "json is null");
+        return JSON.parseObject(jsonString).getString(key);
+    }
+
+    /**
+     * 将字符串转换成JSON字符串
+     *
+     * @param jsonString json字符串
+     * @return 转换成的json对象
+     */
+    public static JSONObject getJSONFromString(String jsonString) {
+        if (TextUtils.isEmpty(jsonString)) {
+            return new JSONObject();
+        }
+        return JSON.parseObject(jsonString);
+    }
+
+    /**
+     * 将json字符串，转换成指定java bean
+     *
+     * @param jsonString json串对象
+     * @param cls        指定的bean
+     * @param <T>        任意bean的类型
+     * @return 转换后的java bean对象
+     */
+
+    public static <T> T toBean(String jsonString, Class<T> cls) {
+        BeanUtil.requireNonNull(jsonString, "jsonString is null");
+        JSONObject jo = JSON.parseObject(jsonString);
+        jo.put(JSON.DEFAULT_TYPE_KEY, cls.getName());
+        return JSON.parseObject(jo.toJSONString(), cls);
+    }
+
+    /**
+     * @param obj 需要转换的java bean
+     * @param <T> 入参对象类型泛型
+     * @return 对应的json字符串
+     */
+    public static <T> String toJson(T obj) {
+        BeanUtil.requireNonNull(obj, "obj is null");
+        return JSON.toJSONString(obj, DEFAULT_FORMAT);
+    }
+
+    /**
+     * 通过Map生成一个json字符串
+     *
+     * @param map 需要转换的map
+     * @return json串
+     */
+    public static String toJson(Map<String, Object> map) {
+        BeanUtil.requireNonNull(map, "map is null");
+        return JSON.toJSONString(map, DEFAULT_FORMAT);
+    }
+
+    /**
+     * 美化传入的json,使得该json字符串容易查看
+     *
+     * @param jsonString 需要处理的json串
+     * @return 美化后的json串
+     */
+    public static String prettyFormatJson(String jsonString) {
+        BeanUtil.requireNonNull(jsonString, "jsonString is null");
+        return JSON.toJSONString(getJSONFromString(jsonString), true);
+    }
+
+    /**
+     * 将传入的json字符串转换成Map
+     *
+     * @param jsonString 需要处理的json串
+     * @return 对应的map
+     */
+    public static Map<String, Object> toMap(String jsonString) {
+        BeanUtil.requireNonNull(jsonString, "jsonString is null");
+        return getJSONFromString(jsonString);
+    }
+}

app/src/main/java/com/stay4it/utilities/io/GsonUtils.java

@@ -0,0 +1,108 @@
+package com.stay4it.utilities.io;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonSyntaxException;
+
+import java.lang.reflect.Type;
+import java.util.List;
+
+/**
+ * GsonUtils.
+ *
+ * @author simon
+ * @version 1.0.0
+ * @since 2015-12-10
+ */
+public class GsonUtils {
+
+    private static Gson sGson = new GsonBuilder().create();
+
+    /**
+     * get Gson.
+     *
+     * @return Gson.
+     */
+    public static Gson getGson() {
+        return sGson;
+    }
+
+    /**
+     * new Gson.
+     *
+     * @return Gson.
+     */
+    public static Gson newGson() {
+        return new GsonBuilder().create();
+    }
+
+    /**
+     * convert json String to Object.
+     *
+     * @param jsonString json string
+     * @param clazz      Object class
+     * @param <T>        Object Class Type
+     * @return Object
+     */
+    public static <T> T fromJsonString(String jsonString, Class<T> clazz) {
+        try {
+            return sGson.fromJson(jsonString, clazz);
+        } catch (Throwable var3) {
+            var3.printStackTrace();
+            return null;
+        }
+    }
+
+    /**
+     * convert json string to the Object of the specified Type.
+     *
+     * @param json    json string
+     * @param typeOfT Type
+     * @param <T>     Type
+     * @return Object of T
+     */
+    public static <T> T fromJsonString(String json, Type typeOfT) {
+        try {
+            return sGson.fromJson(json, typeOfT);
+        } catch (JsonSyntaxException var3) {
+            var3.printStackTrace();
+            return null;
+        }
+    }
+
+    /**
+     * vonvert Object to json string.
+     *
+     * @param object Object
+     * @return json string.
+     */
+    public static String toJsonString(Object object) {
+        try {
+            return sGson.toJson(object);
+        } catch (Throwable var2) {
+            var2.printStackTrace();
+            return "";
+        }
+    }
+
+    /**
+     * Converts a collection of objects using Google's Gson Package
+     *
+     * @param objCol
+     * @return a json string array
+     */
+    public static <T> String toJsonList(List<T> objCol) {
+        return sGson.toJson(objCol);
+    }
+
+    /**
+     * To Json Converter using Goolge's Gson Package<br>
+     * this method converts a simple object to a json string<br>
+     *
+     * @param obj
+     * @return a json string
+     */
+    public static <T> String toJsonObj(T obj) {
+        return sGson.toJson(obj);
+    }
+}