I am confused between match_parent and wrap_content

See more:

XML

I have learnt what is match_parent and wrap_content.But my ouput is not according to the way which i expect.when i give wrap_content and match_parent it is showing the same output.its not wrapping the content

What I have tried:

<linearlayout
 android:layout_width="match_parent" 
="" android:layout_height="match_parent" android:orientation="vertical">
    <imageview
 android:src="@drawable/ocean" 
="" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="1" android:scaletype="centerCrop">
    <textview
 android:text="hi ra" 
="" android:layout_width="wrap_content" android:layout_height="0dp" android:background="#F50057" android:textsize="24sp" android:layout_weight="0">
    <textview
 android:text="hi ra" 
="" android:layout_width="match_parent" android:layout_height="0dp" android:background="#1E88E5" android:textsize="24sp" android:layout_weight="0">