Usage
public class SpCacheApplication extends Application
{
@Override
public void onCreate()
{
super.onCreate();
SpCache.init(this);
}
}
SpCache.getInt(ACTIVITY_CREATE_COUNT, 0);
SpCache.putInt(ACTIVITY_CREATE_COUNT, 1);
代码
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.util.Log;
import java.lang.ref.SoftReference;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
* Created by zhy on 15/5/18.
*/
public class SpCache
{
private static final String TAG = SpCache.class.getSimpleName();
private static SpCache INSTANCE;
private ConcurrentMap> mCache;
private String mPrefFileName = "com.zhy.spcache";
private Context mContext;
private SpCache(Context context, String prefFileName)
{
mContext = context.getApplicationContext();
mCache = new ConcurrentHashMap>();
initDatas(prefFileName);
}
private void initDatas(String prefFileName)
{
if (null != prefFileName && prefFileName.trim().length() > 0)
{
mPrefFileName = prefFileName;
} else
{
Log.d(TAG, "prefFileName is invalid , we will use default value ");
}
//SharedPreferences sp = mContext.getSharedPreferences(mPrefFileName, Context.MODE_PRIVATE);
//Map alreadyDatas = sp.getAll();
//Set keys = alreadyDatas.keySet();
//for (String key : keys)
//{
// mCache.put(key, new SoftReference(alreadyDatas.get(key)));
//}
}
public static SpCache init(Context context, String prefFileName)
{
if (INSTANCE == null)
{
synchronized (SpCache.class)
{
if (INSTANCE == null)
{
INSTANCE = new SpCache(context, prefFileName);
}
}
}
return INSTANCE;
}
public static SpCache init(Context context)
{
return init(context, null);
}
private static SpCache getInstance()
{
if (INSTANCE == null)
throw new NullPointerException("you show invoke SpCache.init() before you use it ");
return INSTANCE;
}
//put
public static SpCache putInt(String key, int val)
{
return getInstance().put(key, val);
}
public static SpCache putLong(String key, long val)
{
return getInstance().put(key, val);
}
public static SpCache putString(String key, String val)
{
return getInstance().put(key, val);
}
public static SpCache putBoolean(String key, boolean val)
{
return getInstance().put(key, val);
}
public static SpCache putFloat(String key, float val)
{
return getInstance().put(key, val);
}
//get
public static int getInt(String key, int defaultVal)
{
return (int) (getInstance().get(key, defaultVal));
}
public static long getLong(String key, long defaultVal)
{
return (long) (getInstance().get(key, defaultVal));
}
public static String getString(String key, String defaultVal)
{
return (String) (getInstance().get(key, defaultVal));
}
public static boolean getBoolean(String key, boolean defaultVal)
{
return (boolean) (getInstance().get(key, Boolean.class));
}
public static float getFloat(String key, float defaultVal)
{
return (float) (getInstance().get(key, defaultVal));
}
//contains
public boolean contains(String key)
{
return mCache.get(key).get() != null ? true : getSharedPreferences().contains(key);
}
//remove
public static SpCache remove(String key)
{
return INSTANCE._remove(key);
}
private SpCache _remove(String key)
{
mCache.remove(key);
SharedPreferences.Editor editor = getSharedPreferences().edit();
editor.remove(key);
SharedPreferencesCompat.apply(editor);
return INSTANCE;
}
//clear
public static SpCache clear()
{
return INSTANCE._clear();
}
private SpCache _clear()
{
mCache.clear();
SharedPreferences.Editor editor = getSharedPreferences().edit();
editor.clear();
SharedPreferencesCompat.apply(editor);
return INSTANCE;
}
private SpCache put(String key, T t)
{
mCache.put(key, new SoftReference(t));
SharedPreferences.Editor editor = getSharedPreferences().edit();
if (t instanceof String)
{
editor.putString(key, (String) t);
} else if (t instanceof Integer)
{
editor.putInt(key, (Integer) t);
} else if (t instanceof Boolean)
{
editor.putBoolean(key, (Boolean) t);
} else if (t instanceof Float)
{
editor.putFloat(key, (Float) t);
} else if (t instanceof Long)
{
editor.putLong(key, (Long) t);
} else
{
Log.d(TAG, "you may be put a invalid object :" + t);
editor.putString(key, t.toString());
}
SharedPreferencesCompat.apply(editor);
return INSTANCE;
}
private Object readDisk(String key, Object defaultObject)
{
Log.e("TAG", "readDisk");
SharedPreferences sp = getSharedPreferences();
if (defaultObject instanceof String)
{
return sp.getString(key, (String) defaultObject);
} else if (defaultObject instanceof Integer)
{
return sp.getInt(key, (Integer) defaultObject);
} else if (defaultObject instanceof Boolean)
{
return sp.getBoolean(key, (Boolean) defaultObject);
} else if (defaultObject instanceof Float)
{
return sp.getFloat(key, (Float) defaultObject);
} else if (defaultObject instanceof Long)
{
return sp.getLong(key, (Long) defaultObject);
}
Log.e(TAG, "you can not read object , which class is " + defaultObject.getClass().getSimpleName());
return null;
}
private Object get(String key, Object defaultVal)
{
SoftReference reference = mCache.get(key);
Object val = null;
if (null == reference || null == reference.get())
{
val = readDisk(key, defaultVal);
mCache.put(key, new SoftReference(val));
}
val = mCache.get(key).get();
return val;
}
/**
* 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
*
* @author zhy
*/
private static class SharedPreferencesCompat
{
private static final Method sApplyMethod = findApplyMethod();
/**
* 反射查找apply的方法
*
* @return
*/
@SuppressWarnings({"unchecked", "rawtypes"})
private static Method findApplyMethod()
{
try
{
Class clz = SharedPreferences.Editor.class;
return clz.getMethod("apply");
} catch (NoSuchMethodException e)
{
}
return null;
}
/**
* 如果找到则使用apply执行，否则使用commit
*
* @param editor
*/
public static void apply(final SharedPreferences.Editor editor)
{
try
{
if (sApplyMethod != null)
{
sApplyMethod.invoke(editor);
return;
}
} catch (IllegalArgumentException e)
{
} catch (IllegalAccessException e)
{
} catch (InvocationTargetException e)
{
}
new AsyncTask()
{
@Override
protected Void doInBackground(Void... params)
{
editor.commit();
return null;
}
};
}
}
private SharedPreferences getSharedPreferences()
{
return mContext.getSharedPreferences(mPrefFileName, Context.MODE_PRIVATE);
}
}
