Edittext在xml文件中设置android：focusable=“false”之后，edittext再次获得焦点。

在xml文件中，edittext这个控件设置了，android：focusable=“false”，

在代码中edittext.setfocusable(true),edittext这个控件仍然无法点击，百度之后，得到的结果是：

一定要按一下这个顺序写，重新使edittext获取焦点：

                         edittext.setFocusable(true);
 edittext.setFocusableInTouchMode(true);
 edittext.requestFocus();
 edittext.requestFocusFromTouch();

这是为什么呢？

查阅API：

setFocusable(boolean):

Set whether this view can receive the focus. Setting this to false will also ensure that this view is not focusable in touch mode.

//--设置edittext是否可以获得焦点

setFocusableInTouchMode(boolean):

Set whether this view can receive focus while in touch mode. Setting this to true will also ensure that this view is focusable.

//--设置edittext在touch模式下是否可以获得焦点

requestFocus():

Call this to try to give focus to a specific view or to one of its descendants. A view will not actually take focus if it is not focusable (

isFocusable()

returns false), or if it is focusable and it is not focusable
in touch mode (

isFocusableInTouchMode()

) while the device is in touch mode. 

//--调用这个给指定的view或者它的子view焦点。如果这个view在isFocusable()方法下返回false，或者isFocusableInTouchMode()方法下返回false，这个view不会真正获得焦点

requestFocusFromTouch():

Call this to try to give focus to a specific view or to one of its descendants. This is a special variant of

requestFocus()

that will allow views that are not focuable in touch mode to request focus when they are touched.

//--调用这个给指定的view或者它的子view焦点。这个特别的变异于（？）requestFocus（）的方法会让在这个view被touch时，给view焦点。

以上。