Android Eclipse Debug Report Java.lang.ClassCastException exception

ImageView a position in a layout file before the button is first placed

No error in compiling code

and adjust the position of both.

Compile the report again with the following error

Exception hint the button type cannot be converted to the ImageView type why do I get such an error, I obviously did not let them convert between.

It turns out that the compilation of Eclipse is based on the mechanism of time stamp judgment.
So when you press build all, some eclipse thinks that a class with no time stamp changes will not be compiled.
So you can clean it and compile it first. At this point eclipse will clean up all the previously compiled information and compile it.

After re-compiling the front and back positions of the two controls, you can remove the compiled. class file from Project->clean.

Then compile again, no error, complete.