android app development simple messaging app

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http://stackoverflow.com – I use the following main.xml code but I can only see one edit text box I need help regarding why does this occur? I have tried many times but I cannot see proper edit box and all other components <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity" > <TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:text="ENTER THE PHONE NUMBER HERE" /> <EditText andro (HowTos)