Neighborhoods Android layout file

Layout layout file not found

Hello everyone! Encountered such a problem: I am here to set a total of three layout files, the first to jump to the second, third, and the second to the third jump, as



Currently there is no third layout what content is there such a problem: In the third file Activity3.java in setContentView (R.layout.....); Activity3.xml file can not be found here, but has been established, AndroidManifes.xml also added, how it happened? Neighborhoods ah!

In R.java filepublic static final class layout {
public static final int activity1 = 0x7f030000;
public static final int activity2 = 0x7f030001;
}
I have no new activity3 this layout file, Why? Online, thank you!

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Reply:
There should be some, otherwise, how will see a good document layout
Reply:
Appears as shown: only 1,2 two Activity, no third. . .
Can not find
Reply:
Layout files should be written question.
Is also possible that the cache did not react, try to refresh the project to try.
Reply:
project-> clean
Reply:
Solved! xml files can not use uppercase? Lowercase and then click on the clear no problem! . . . Amount. . . Thank you to place it