sample

<Text View
    android:text="Hapy Birthday"
    android:layout_width="150dp"
    android:layout_height="150"
    android:background="@android:color/darker_groy"
    >

Line 1: TextView should not have space between it.
Line 2: Happy is not spelled correctly. There is no XML syntax error though.
Line 4: dp is missing in 150.
Line5: gray is not spelled right.
Line6: / is missing before>.

                                                   Errors

1. There is a space in between the "TextView" keyword.
2. The "150" don't have the unit "dp".
3. The color "darker_groy" is not recognized as a color.
4. There is no closing tag on the last line.

Good to learn more

There is no closing tag on the last line

there is a space between TextView at the first line 2,there is no dp next to 150 at the fourth line 3,the word at the fifth line and at the final must be gray but it is groy 4,the ending of the tag is like this > but it must be />

Good