数据存储之---SharedPreferences

一种轻量级接收存储数据。

是以键值对的方式永久存储；

读取，写入的关联是由getSharedPreferences（）中的第一个参数决定

数据的写入：

SharedPreferences msPreferences = getContext().getSharedPreferences(
"com.scxh.meituan.ui.PREFERENCES_FILE_KEY", 0);//第一个参数一般是由包名+PREFERENCES_FILE_KEY组成
SharedPreferences.Editor editor = msPreferences.edit();
editor.putString("user", "user001");
editor.putString("password", "password112");
editor.commit();

数据的读取

SharedPreferences mshaPreferences = getContext().getSharedPreferences(
"com.scxh.meituan.ui.PREFERENCES_FILE_KEY", 0);
String user = mshaPreferences.getString("user", "");
String pass =mshaPreferences.getString("password", "");：

用的单例模式自定义SharedPreferencesHelper

<span style="font-size:12px;">public class SharedPrefrenceHelper {Context context;private static SharedPrefrenceHelper sHelper;private SharedPreferences mSharedPreference;private static final String NAME = "com.scxh.android.store.PREFERENCES_FILE_KEY";public static SharedPrefrenceHelper getInstance(Context context) {if (sHelper == null) {sHelper = new SharedPrefrenceHelper(context);}return sHelper;}private SharedPrefrenceHelper(Context context) {mSharedPreference = context.getSharedPreferences(NAME, 0);}}</span>

添加对象

private static final String ID = "id";
private static final String NAME = "name";
private static final String AGE = "age";
private static final String SCORE = "score";

public void addStudent(Student student) {
Editor editor = mSharedPreferences.edit();
editor.putInt(ID, student.getId());
editor.putString(NAME, student.getName());
editor.putInt(AGE, student.getAge());
editor.putString(SCORE, student.getScore());
editor.commit();
}