可以建立对象把Application.ActivityLifecycleCallbacks接口中的函数实现，并利用public void registerActivityLifecycleCallbacks (Application.ActivityLifecycleCallbacks callback)函数向application添加代理对象。

比如以下代码，在本程序的全部activity的resume时都会调用。

 @Override
    public void onActivityResumed(Activity arg0) {
        System.out.println("onActivityResumed...................");

        System.out.println("~~~~~~~~~~~~test activity is "+arg0.getClass());

        if( arg0.getClass() == PasscodeUnlockActivity.class )
            return;

        System.out.println("onActivityResumed.........111111..........");
       if(  ( this.appLockDisabledActivities != null ) && Arrays.asList(this.appLockDisabledActivities).contains( arg0.getClass().getName() ) )
           return;

        System.out.println("onActivityResumed........22222...........");
        if(mustShowUnlockSceen()) {
            //uhhh ohhh!
            System.out.println("show lock........4444..........");
            Intent i = new Intent(arg0.getApplicationContext(), PasscodeUnlockActivity.class);
            i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            arg0.getApplication().startActivity(i);
            return;
        }

    }

Android 向Application对象添加Activity监听