sharedPreference 工具类

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package com.dream.duck.drawcanvas.util;

import android.content.Context;
import android.content.SharedPreferences;
import android.support.annotation.Nullable;

/**
 * @author duck
 * @function sharedPreference 工具类
 *
 */
public final class SharedPreferenceUtil {

    private static final String FILE_NAME = "hello"; //文件名
    private static SharedPreferenceUtil mInstance;

    private SharedPreferenceUtil(){}

    public static SharedPreferenceUtil getInstance(){
        if(mInstance == null){
            synchronized (SharedPreferenceUtil.class){
                if(mInstance == null){
                    mInstance = new SharedPreferenceUtil();
                }
            }
        }
        return mInstance;
    }

    /**
     * 存入键值对
     * @param context
     * @param key
     * @param value
     */

    public void put(Context context, String key, Object value){
        //判断类型
        String type = value.getClass().getSimpleName();
        SharedPreferences sharedPreferences = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        if("Integer".equals(type)){
            editor.putInt(key,(Integer)value);
        }else if ("Boolean".equals(type)){
            editor.putBoolean(key,(Boolean)value);
        }else if ("Float".equals(type)){
            editor.putFloat(key,(Float)value);
        }else if ("Long".equals(type)){
            editor.putLong(key,(Long)value);
        }else if ("String".equals(type)){
            editor.putString(key,(String) value);
        }
        editor.apply();
    }

    /**
     * 读取键的值，若无则返回默认值
     * @param context
     * @param key
     * @param defValue 默认值
     * @return
     */
    @Nullable
    public Object get(Context context, String key, Object defValue){
        SharedPreferences sharedPreferences = context.getSharedPreferences(FILE_NAME, Context.MODE_PRIVATE);
        String type = defValue.getClass().getSimpleName();
        if("Integer".equals(type)){
            return sharedPreferences.getInt(key,(Integer)defValue);
        }else if ("Boolean".equals(type)){
            return sharedPreferences.getBoolean(key,(Boolean)defValue);
        }else if ("Float".equals(type)){
            return sharedPreferences.getFloat(key,(Float)defValue);
        }else if ("Long".equals(type)){
            return sharedPreferences.getLong(key,(Long)defValue);
        }else if ("String".equals(type)){
            return sharedPreferences.getString(key,(String) defValue);
        }
        return null;
    }
}