Button's don't work when clicked on, Code is correct

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http://stackoverflow.com – I tried test files like HelloWorld and Count Down timer. Neither of the buttons on my app seem to work. These segments of code are ones I downloaded from the internet, and they have been reported to work. I don't know what the issue could be. I am also very new eclipse and android app programming. activity_main.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:textColor="#FF0000" android:background="#000000" android:layout_he (HowTos)