Android Learning notes (1)

Fill_parent, wrap_content, match_parent usage Example test

Fill_parent set a top layout or control to make it full of screens.

Wrap_content layouts are automatically scaled to fit the contents of the view (just to support the size of their content)

Android2.2 after fill_parent replaced by Match_parent.

Note:Beginning with Android 2.2 (API level 8),"fill_parent"has been renamed"match_parent"To better reflect the behavior. The reason is so if you set a view to "fill_parent" It does expand to fill the remaining space after sibling views is considered, but instead expands to match the size of the parent view no matter what-it would overlap any sibling views.

<button         android:layout_width= "wrap_content"        android:layout_height= "wrap_content"        android:text= " @string/button_send "  />

<button         android:layout_width= "match_parent"        android:layout_height= "wrap_content"        android:text= " @string/button_send "  />

<button         android:layout_width= "wrap_content"        android:layout_height= "match_parent"        android:text= " @string/button_send "  />

<button         android:layout_width= "match_parent"        android:layout_height= "match_parent"        android:text= "@string/button_send"  />

ref:http://blog.csdn.net/jumping_android/article/details/7397991