Android中获取全局Context

package Util;

import android.app.Application;
import android.content.Context;

public class MyApplication extends Application {
	    private static Context context;
		@Override
		public void onCreate() {
			// TODO Auto-generated method stub
			context = getApplicationContext();
		}
		public static Context getContext(){
			
			return context;
		}
}

//别忘记在androidManifest.xml文件中<application>标签中指定能属性该类的全路径
//如android:name="Util.MyApplication"