tv.setText does not display its body text

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http://stackoverflow.com – i'm a beginner learning to build an android app. I have a little (v basic) C++ knowledge, but first time trying JAVA for android app. Please do help me with my questions! 1.If i want to display a sentence, do i use tv.setText? If using tv.setText, why cant it seem to display what I've asked it to display, which is the 3 lines as shown in the picture? Any help is appreciated! (HowTos)