Analysis of the Problem of NULL pointer when calling the show () method of the replay of Dialog.

Analysis of the Problem of NULL pointer when calling the show () method of the replay of Dialog.

When we customize Dialog, we often rewrite the show method to make it more powerful and scalable.

In the show method, the style of some controls contained in the Dialog is changed, but empty pointers are often displayed.

Here is a situation I know:

We often initialize the controls contained in Dialog in onCreate, while

After the Dialog is created, you must call the show method to call back the onCreate method and display it. That is to say,

We must set the control after super. show (), similar to the following:

Public void show (boolean success) {super. show (); if (success) {ivThumb. setBackgroundResource (R. mipmap.Success);} Else {ivThumb. setBackgroundResource (R. mipmap.Ail);}}