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Simple calculator program not showing proper output

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http://stackoverflow.com – I have some simple code where I input two numbers in EditText fields, add them together, and show them in a TextView. Here is my code: <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" android:visibility="invisible"/> <EditText android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/textView1" android:layout_below="@+id/textView1" android:layout_marginTop="32dp" an (HowTos)