SpUtils.java

package com.lfk.justwetools.Utils;

import android.content.Context;
import android.content.SharedPreferences;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * 简化Sp存储的工具类
 *
 * @author liufengkai
 */
public class SpUtils {

    public SpUtils() {
        /* cannot be instantiated */
        throw new UnsupportedOperationException("cannot be instantiated");
    }

    /**
     * Sp文件名
     */
    public static final String FILE_NAME = "share_data";

    /**
     * 保存数据的方法，添加具体数据类型
     *
     * @param context
     * @param key
     * @param object
     */
    public static void put(Context context, String key, Object object) {

        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();

        // 判断数据类型
        if (object instanceof String) {
            editor.putString(key, (String) object);
        } else if (object instanceof Integer) {
            editor.putInt(key, (Integer) object);
        } else if (object instanceof Boolean) {
            editor.putBoolean(key, (Boolean) object);
        } else if (object instanceof Float) {
            editor.putFloat(key, (Float) object);
        } else if (object instanceof Long) {
            editor.putLong(key, (Long) object);
        } else {
            editor.putString(key, object.toString());
        }

        SharedPreferencesCompat.apply(editor);
    }

    /**
     * 获取保存数据的方法，添加具体数据类型
     *
     * @param context
     * @param key
     * @param defaultObject
     * @return object
     */
    public static Object get(Context context, String key, Object defaultObject) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);

        if (defaultObject instanceof String) {
            return sp.getString(key, (String) defaultObject);
        } else if (defaultObject instanceof Integer) {
            return sp.getInt(key, (Integer) defaultObject);
        } else if (defaultObject instanceof Boolean) {
            return sp.getBoolean(key, (Boolean) defaultObject);
        } else if (defaultObject instanceof Float) {
            return sp.getFloat(key, (Float) defaultObject);
        } else if (defaultObject instanceof Long) {
            return sp.getLong(key, (Long) defaultObject);
        }

        return null;
    }

    /**
     * 存放数组
     *
     * @param context
     * @param list
     * @param key
     */
    public static void putList(Context context, List list, String key) {
        JSONArray jsonArray = new JSONArray();
        for (int i = 0; i < list.size(); i++) {
            JSONObject object = new JSONObject();
            try {
                object.put(i + "", list.get(i));
                jsonArray.put(object);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        put(context, key, jsonArray.toString());
    }

    /**
     * 获取数组
     *
     * @param context
     * @param key
     * @return list
     */

    public static List getList(Context context, String key) {
        List list = new ArrayList();
        try {
            JSONArray jsonArray = new JSONArray((String) get(context, key, ""));
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject object = jsonArray.getJSONObject(i);
                list.add(i, object.getString(i + ""));
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return list;
    }

    /**
     * 存入哈希表
     *
     * @param context
     * @param map
     * @param key
     */
    public static void putMap(Context context, Map<?, ?> map, String key) {
        JSONArray jsonArray = new JSONArray();
        Set set = map.entrySet();
        Iterator iterator = set.iterator();
        for (int i = 0; i < map.size(); i++) {
            Map.Entry mapEntry = (Map.Entry) iterator.next();
            try {
                JSONObject object = new JSONObject();
                object.put("key", mapEntry.getKey());
                object.put("value", mapEntry.getValue());
                jsonArray.put(object);
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        put(context, key, jsonArray.toString());
    }

    /**
     * 读取哈希表
     *
     * @param context
     * @param key
     * @return map
     */
    public static Map getMap(Context context, String key) {
        Map map = new HashMap();
        try {
            JSONArray jsonArray = new JSONArray((String) get(context, key, ""));
            for (int i = 0; i < jsonArray.length(); i++) {
                try {
                    JSONObject object = jsonArray.getJSONObject(i);
                    map.put(object.getString("key"), object.getString("value"));
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return map;
    }

    /**
     * 移除某个key值已经对应的值
     *
     * @param context
     * @param key
     */
    public static void remove(Context context, String key) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        editor.remove(key);
        SharedPreferencesCompat.apply(editor);
    }

    /**
     * 清除所有数据
     *
     * @param context
     */
    public static void clear(Context context) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sp.edit();
        editor.clear();
        SharedPreferencesCompat.apply(editor);
    }

    /**
     * 查询某个key是否存在
     *
     * @param context
     * @param key
     * @return
     */
    public static boolean contains(Context context, String key) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);
        return sp.contains(key);
    }

    /**
     * 返回所有的键值对
     *
     * @param context
     * @return map
     */
    public static Map<String, ?> getAll(Context context) {
        SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
                Context.MODE_PRIVATE);
        return sp.getAll();
    }

    /**
     * 解决SharedPreferencesCompat.apply方法的兼容类
     *
     * @author liufengkai
     */
    private static class SharedPreferencesCompat {

        private static final Method sApplyMethod = findApplyMethod();

        /**
         * 反射查找apply的方法
         *
         * @return method
         */
        @SuppressWarnings({"unchecked", "rawtypes"})
        private static Method findApplyMethod() {
            try {
                Class clz = SharedPreferences.Editor.class;
                return clz.getMethod("apply");
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            }
            return null;
        }

        /**
         * 如果找到则使用apply执行，否则使用commit
         *
         * @param editor
         */
        public static void apply(SharedPreferences.Editor editor) {
            try {
                if (sApplyMethod != null) {
                    sApplyMethod.invoke(editor);
                    return;
                }
            } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
                e.printStackTrace();
            }
            editor.commit();
        }
    }

}