hawk a product_hawk英文怎么读

Hawk 是一个非常便捷的数据库  . 操作数据库只需一行代码 , 能存任何数据类型 .

github 地址: https://github.com/orhanobut/hawk

一、概念

SharedPreferences的使用大家应该非常熟悉啦。这是一种轻量级的存储简单配置信息的存储机制，以key-value的形式保存数据。

这里介绍一款基于SharedPreferences的的存储框架，是由Android开发大神Orhan Obut开源维护的，

它使用: 

AES 加密

能选择使用SharedPreferences  或者  SQLite

       Gson解析     (文章下方的Simple中有替换fastJson的版本)

提供:

安全数据持久化

能存储任何类型

二、用法

添加依赖

compile "com.orhanobut:hawk:2.0.1"

初始化

Hawk.init(context).build();

//基本数据类型
 Hawk.put("position","zz");

  Hawk.get(“position”);

二、用法源码分析

put：

HawkUtils.checkNull("Key", key);
log("Hawk.put -> key: " + key + ", value: " + value);

// If the value is null, delete it
if (value == null) {
  log("Hawk.put -> Value is null. Any existing value will be deleted with the given key");
  return delete(key);
}

// 1. Convert to text
String plainText = converter.toString(value);
log("Hawk.put -> Converted to " + plainText);
if (plainText == null) {
  log("Hawk.put -> Converter failed");
  return false;
}

// 2. Encrypt the text
String cipherText = null;
try {
  cipherText = encryption.encrypt(key, plainText);
  log("Hawk.put -> Encrypted to  " + cipherText);
} catch (Exception e) {
  e.printStackTrace();
}
if (cipherText == null) {
  log("Hawk.put -> Encryption failed");
  return false;
}

// 3. Serialize the given object along with the cipher text
String serializedText = serializer.serialize(cipherText, value);
log("Hawk.put -> Serialized to" + serializedText);
if (serializedText == null) {
  log("Hawk.put -> Serialization failed");
  return false;
}

// 4. Save to the storage
if (storage.put(key, serializedText)) {
  log("Hawk.put -> Stored successfully");
  return true;
} else {
  log("Hawk.put -> Store operation failed");
  return false;
}

get：

log("Hawk.get -> key: " + key);
if (key == null) {
  log("Hawk.get -> null key, returning null value ");
  return null;
}

// 1. Get serialized text from the storage
String serializedText = storage.get(key);
log("Hawk.get -> Fetched from storage : " + serializedText);
if (serializedText == null) {
  log("Hawk.get -> Fetching from storage failed");
  return null;
}

// 2. Deserialize
DataInfo dataInfo = serializer.deserialize(serializedText);
log("Hawk.get -> Deserialized");
if (dataInfo == null) {
  log("Hawk.get -> Deserialization failed");
  return null;
}

// 3. Decrypt
String plainText = null;
try {
  plainText = encryption.decrypt(key, dataInfo.cipherText);
  log("Hawk.get -> Decrypted to : " + plainText);
} catch (Exception e) {
  log("Hawk.get -> Decrypt failed: " + e.getMessage());
}
if (plainText == null) {
  log("Hawk.get -> Decrypt failed");
  return null;
}

// 4. Convert the text to original data along with original type
T result = null;
try {
  result = converter.fromString(plainText, dataInfo);
  log("Hawk.get -> Converted to : " + result);
} catch (Exception e) {
  log("Hawk.get -> Converter failed");
}

adb命令查看sharedpreferences

adb shell run-as com.example.android //对应包名

cd shared_prefs

注意点：APP升级过程中 修改包名称导致反序列化失败，get数据为null。

参考：https://www.cnblogs.com/zhangqie/p/10512215.html

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