问题:
有的时候我们一个查询的接口需要重复的请求多次,尽管每次返回的结果是一样的,但是还是需要请求多次,这个时候我们就可以再第一次请求的时候把数据存到我们的缓存中,之后的请求就可以直接调用缓存中没有过期的数据,这里我们奉上工具类代码:
package com.zjxf.utils;
import android.content.SharedPreferences;
public class SharedPrefUtils {
private static SharedPrefUtils instance;
private SharedPreferences sp;
private SharedPrefUtils() {
sp = BDApplication.getInstance().getSharedPreferences(
BDApplication.getInstance().getPackageName(), 0);
}
public static SharedPrefUtils getInstance() {
if (instance == null) {
synchronized (SharedPrefUtils.class) {
if (instance == null) {
instance = new SharedPrefUtils();
}
}
}
return instance;
}
public void putStr2SP(String key, String value) {
sp.edit().putString(key, value).commit();
}
public String getStrBykey(String key, String defValue) {
return sp.getString(key, defValue);
}
public void putInt2SP(String key, Integer value) {
sp.edit().putInt(key, value).commit();
}
public Integer getIntByKey(String key, Integer defValue) {
return sp.getInt(key, defValue);
}
public void putFloat2SP(String key, Float value) {
sp.edit().putFloat(key, value).commit();
}
public Float getFloatByKey(String key, Float defValue) {
return sp.getFloat(key, defValue);
}
public void putLong2SP(String key, Long value) {
sp.edit().putLong(key, value).commit();
}
public Long getLongByKey(String key, Long defValue) {
return sp.getLong(key, defValue);
}
public void putBoolean2SP(String key, boolean value) {
sp.edit().putBoolean(key, value).commit();
}
public Boolean getBooleanByKey(String key, boolean defValue) {
return sp.getBoolean(key, defValue);
}
public void remove(String key) {
try {
sp.edit().remove(key).commit();
} catch (Exception e) {
e.printStackTrace();
}
}
}
package com.zjxf.utils;
import android.app.Application;
public class BDApplication extends Application {
private static BDApplication instance;
@Override
public void onCreate() {
super.onCreate();
instance = this;
CrashHandler.getInstance().init(this.getApplicationContext());
}
public static BDApplication getInstance(){
return instance;
}
}
上面这个全局的类需要在AndroidManifest.xml里面设置一下
然后就可以使用了,用法如下:
SharedPrefUtils.getInstance().putStr2SP(CacheKeys.LOGIN_SESSION_Id, sessionId); //添加值
String schoolName = SharedPrefUtils.getInstance().getStrBykey(CacheKeys.THIS_SCHOOL_NAME, StringUtil.EMPTY_STRING); //获取值