全局共享变量(Android)

在安卓中一种比较好的储存全局共享变量的方法是继承Application,将全局变量写入继承的Application类中,然后在Activity或Service中通过getApplication()方法来获全局变量中.形如以下用法:

//MyApplication.javapublic class MyApplication extends Application{public WeakReference<MyPublicData> d;public void setMyPublicData(MyPublicData _d){d = null;d = new WeakReference<MyPublicData>(_d);}public MyPublicData getMyPublicData(){return d.get();}}

 

//Activity_1.javad = new MyPublicData(this);((MyApplication)this.getApplication()).setMyPublicData(d);//Activity_2.javaMyPublicData d = ((MyApplication)this.getApplication()).getMyPublicData();

 

 最后在manifest中application标签上加入name项:

<application        ...        android:name=".MyApplication">

我的个人习惯是用一个MyPublicData来储存各种全局变量,这样比较符合语义而且比较容易修改.

例子中在Activity_1中初始化MyPublicData是因为项目设计因素,个人建议将MyPublicData的初始化放在MyApplication的OnCreate中.