相信Shared Preferences对所有开发者都不陌生了，接下来给大家分享一下我对它的理解和封装
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.preference.PreferenceManager;
/**
* @author zlang
*
*/
public final class AppPresences {
private static AppPresences instance;
public static boolean isSoundOpen = true;
public static boolean isShakeOpen = true;
public static boolean isDownOpen = true;
private SharedPreferences mSharedPreferences;
private Editor mEditor ;
private AppPresences(Context context){
mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
mEditor = mSharedPreferences.edit();
}
private synchronized static void syncInit(Context context){
if(instance == null){
instance = new AppPresences(context);
}
}
public static AppPresences init(Context context){
if(instance == null){
syncInit(context);
}
return instance;
}
public static AppPresences getInstance(){
return instance;
}
private boolean checkPutInput(String key){
if(key == null || key.equals("")){
return false ;
}
if(mEditor == null){
return false ;
}
return true ;
}
public void putString(String key,String value){
if(!checkPutInput(key) || value == null) return ;
mEditor.putString(key, value).commit() ;
}
public void putInt(String key,int value){
if(!checkPutInput(key)) return ;
mEditor.putInt(key, value).commit() ;
}
public void putLong(String key,long value){
if(!checkPutInput(key)) return ;
mEditor.putLong(key, value).commit() ;
}
public void putBoolean(String key,boolean value){
if(!checkPutInput(key)) return ;
mEditor.putBoolean(key, value).commit() ;
}
public void putFloat(String key,float value){
if(!checkPutInput(key)) return ;
mEditor.putFloat(key, value).commit() ;
}
private boolean checkGetInput(String key){
if(key == null || key.equals("")){
return false ;
}
if(mSharedPreferences == null){
return false ;
}
return true ;
}
public String getString(String key){
if(!checkGetInput(key)) return null ;
return mSharedPreferences.getString(key, "");
}
public int getInt(String key){
if(!checkGetInput(key)) return -1 ;
return mSharedPreferences.getInt(key, -1);
}
public long getLong(String key){
if(!checkGetInput(key)) return -1 ;
return mSharedPreferences.getLong(key, -1) ;
}
public float getFloat(String key){
if(!checkGetInput(key)) return -1 ;
return mSharedPreferences.getFloat(key, 0.0f) ;
}
public boolean getBoolean(String key){
if(!checkGetInput(key)) return false ;
return mSharedPreferences.getBoolean(key, false) ;
}
public boolean getBoolean(String key,boolean defaultValue){
if(!checkGetInput(key)) return false ;
return mSharedPreferences.getBoolean(key, defaultValue) ;
}
public void clear(){
mSharedPreferences = null ;
mEditor = null ;
instance = null ;
}
}
当然你在用之前你必须初始化它
AppPresences.init(this);
用起来就更方便了，
//获取
//AppPresences.getInstance().getString(EConfig.USER_ID))
//AppPresences.getInstance().getInt(EConfig.USER_ID))
AppPresences.getInstance().getLong(EConfig.USER_ID))
//设置 既put
//AppPresences.getInstance().putString("Dirain",EConfig.USER_ID))
//AppPresences.getInstance().putInt(100,EConfig.USER_ID))
AppPresences.getInstance().putLong(121212121,EConfig.USER_ID))
当然，还有boolean什么的，你多用用就可以了。希望这文章对你们有帮助，苦逼的我敲代码去了。
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