封装SharedPreferences的工具类

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

/**
 * 封装SharedPreferences的工具类
 * int/float/double/boolean/String
 * 1. 保存数据
 * putString(String key, String value)
 * putInt(String key, int value)
 * putBoolean(String key, boolean value)
 * 2. 读取数据
 * getString(String key, String defValue)
 * getInt(String key, int defValue)
 * getBoolean(String key, boolean defValue)
 * 3. 移除数据
 * remove(String key)
 */
public class SpUtils {//单列
    //把sp设置成单例模式：全局只有一个该对象
    private static SharedPreferences sp;
private static SpUtils instance = new SpUtils();

private SpUtils() {
    }

public static SpUtils getInstance(Context context) {
if (sp == null) {//懒汉式
            sp = context.getSharedPreferences("ms", Context.MODE_PRIVATE);
        }
return instance;
    }

/**
     * 把数据保存到SharedPerference中
     */
    public void save(String key, Object value) {
//获取Editor对象
        Editor editor = sp.edit();
if (value instanceof String) {
            editor.putString(key, (String) value);
        } else if (value instanceof Integer) {
            editor.putInt(key, (Integer) value);
        } else if (value instanceof Boolean) {
            editor.putBoolean(key, (Boolean) value);
        } else if (value instanceof Float) {
            editor.putFloat(key, (Float) value);
        }
//提交保存数据
        editor.commit();
    }

/**
     * 读取数据
     */
    public String getString(String key, String defValue) {
return sp.getString(key, defValue);
    }

public int getInt(String key, Integer defValue) {
return sp.getInt(key, defValue);
    }

public boolean getBoolean(String key, Boolean defValue) {
return sp.getBoolean(key, defValue);
    }

public double getFloat(String key, Float defValue) {
return sp.getFloat(key, defValue);
    }

/**
     * 移除数据
     */
    public void remove(String key) {
sp.edit().remove(key).commit();
    }
}