Android Activity返回键监听的两种方式 1.覆写Activity的OnBackPressed方法 官方解释: Called when the activity has detected the user's press of the back key. The default implementation simply finishes the current activity, but you can override this to do whatever you want.…
hashmap,contentvalue,namevaluepair,jsonobject ArrayList和HashMap的区别:内部元素:ArrayList储存的是单个对象(此对象是可以通过设置对象类进而封装各种数据的),即ArrayList<user> al = new ArrayList<user>(); 而HashMap储存的是一组一组的key和value,像:HashMap<int,String> hm = new HashMap<int,St…
android在发展中,监视键返回到后事件经常被用来,在下面的例子来说明什么android返回键事件监听器. public class BackKeyTest extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setCo…