数据本地存储为对象
一、作用
很多情况会用到数据存储，比如Student对象，有很多以这个对象为核心的数据。
二、使用
2.1写一个Config
public class SchooltConfig {
private StudentConfig student1;
private StudentConfig student2;
private TeacherConfig teacher1;
private TeacherConfig teacher2;
//set get
public SchooltConfig() {
student1 = new StudentConfig();
student2 = new StudentConfig();
teacher1 = new TeacherConfig();
teacher2 = new TeacherConfig();
}
public static class StudentConfig {
int id
String name;
int age;
// set get
......
}
public static class TeacherConfig{
int id
String name;
int age;
// set get
......
}
}2.2存
2.2.1数据存的使用
private SchoolConfig.StudentConfig student1Config;
private SchoolConfig.StudentConfig student2Config;
student1Config= ConfigKeeper.Inst().schoolConfig.getStudent1Config;
student2Config= ConfigKeeper.Inst().schoolConfig.getStudent2Config;
student1Config.setId = 1；
student1Config.setName = "张三"；
student1Config.setAge = 16；
student2Config.setId = 2；
student2Config.setName = "李四"；
student2Config.setAge = 18；
//在onDestroy()或者其他地方存
ConfigKeeper.Inst().saveSchoolConfig();2.2.2写一个ConfigKeeper.java（其他工具类util见最后）
public class ConfigKeeper {
private String TAG = this.getClass().getName();
private SchoolConfig schoolConfig = new SchoolConfig();
private File schoolFile = null;
private static ConfigKeeper inst = null;
private boolean initialized = false;
private ConfigKeeper() {
initConfig();
}
public static ConfigKeeper Inst() {
if (inst == null) {
inst = new ConfigKeeper();
}
return inst;
}
public void initConfig() {
synchronized (this) {
if (!initialized) {
schoolFile = getSchoolConfigFile();
if (schoolFile.exists()) {
schoolConfig = new Gson().fromJson(IOUtils.readStr(schoolFile), SchoolConfig.class);
if (schoolConfig == null) {
schoolConfig = new SchoolConfig();
}
}
initialized = true;
}
}
}
public void saveSchoolConfig() {
if (权限判断) {
Log.e("TAG", "保存配置错误,未获取到写入文件权限")
return;
}
if (schoolFile != null) {
ThreadPool.getInstance().executeSingle(new Runnable() {
@Override
public void run() {
if (schoolConfig != null) {
String configJson = new Gson().toJson(schoolConfig);
IOUtils.writeStr(schoolFile, configJson);
}
}
});
}
}
public SchoolConfig getSchoolConfig() {
return schoolConfig;
}
public void setSchoolConfig(SchoolConfig conf) {
schoolConfig = conf;
}
private File getSchoolConfigFile() {
return FileUtils.getFile("config", "school_config.json");
}
}
2.3取
//student1Config的实例看存
if (student1Config.getName != null) {
String name = student1Config.getName;
}
....三、注意
等我想到在写
四、附链接
FileUtils、IOUtils、ThreadPool（还没写）
