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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

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