原文地址:
http://blog.csdn.net/lmj623565791/article/details/38965311
SPUtil时SharedPreferences的工具类,原文只封装了默认的sp文件名,用重载我有自己添加了可自定义sp文件名的方法。封装了SP之后,用起来每次都一行代码搞定,太爽了。
package org.yxm.android.utils;
import android.content.Context;
import android.content.SharedPreferences;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
/**
* Created by yxm on 16-6-23.
*/
public class SPUtil {
/**
* 保存在手机里面的文件名
*/
public static final String FILE_NAME = "share_data";
/**
* 保存数据的方法,我们需要拿到保存数据的具体类型,然后根据类型调用不同的保存方法
*/
public static void put(Context context, String key, Object object) {
put(context, FILE_NAME, key, object);
}
public static void put(Context context, String spName, String key, Object object) {
SharedPreferences sp = context.getSharedPreferences(spName,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
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);
}
/**
* 得到保存数据的方法,我们根据默认值得到保存的数据的具体类型,然后调用相对于的方法获取值
*/
public static Object get(Context context, String key, Object defaultObject) {
return get(context, FILE_NAME, key, defaultObject);
}
public static Object get(Context context, String spName, String key, Object defaultObject) {
SharedPreferences sp = context.getSharedPreferences(spName,
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;
}
/**
* 移除某个key值已经对应的值
*/
public static void remove(Context context, String key) {
remove(context, FILE_NAME, key);
}
public static void remove(Context context, String spName, String key) {
SharedPreferences sp = context.getSharedPreferences(spName,
Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.remove(key);
SharedPreferencesCompat.apply(editor);
}
/**
* 清除所有数据
*/
public static void clear(Context context) {
clear(context, FILE_NAME);
}
public static void clear(Context context, String spName) {
SharedPreferences sp = context.getSharedPreferences(spName, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sp.edit();
editor.clear();
SharedPreferencesCompat.apply(editor);
}
/**
* 查询某个key是否已经存在
*/
public static boolean contains(Context context, String key) {
return contains(context, FILE_NAME, key);
}
public static boolean contains(Context context, String spName, String key) {
SharedPreferences sp = context.getSharedPreferences(spName, Context.MODE_PRIVATE);
return sp.contains(key);
}
/**
* 返回所有的键值对
*/
public static Map getAll(Context context) {
return getAll(context, FILE_NAME);
}
public static Map getAll(Context context, String spName) {
SharedPreferences sp = context.getSharedPreferences(spName,
Context.MODE_PRIVATE);
return sp.getAll();
}
/**
* 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
*/
private static class SharedPreferencesCompat {
private static final Method sApplyMethod = findApplyMethod();
/**
* 反射查找apply的方法
*/
@SuppressWarnings({"unchecked", "rawtypes"})
private static Method findApplyMethod() {
try {
Class clz = SharedPreferences.Editor.class;
return clz.getMethod("apply");
} catch (NoSuchMethodException e) {
}
return null;
}
/**
* 如果找到则使用apply执行,否则使用commit
*/
public static void apply(SharedPreferences.Editor editor) {
try {
if (sApplyMethod != null) {
sApplyMethod.invoke(editor);
return;
}
} catch (IllegalArgumentException e) {
} catch (IllegalAccessException e) {
} catch (InvocationTargetException e) {
}
editor.commit();
}
}
}