CODEWITHSUNDEEP
androidandroid-fragments
hamid_c
hamid_c

Reputation: 849

the different ways of adding fragment

what is the different between this 2 way of adding fragment:

1:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent" 
        android:layout_height="match_parent">

       <fragment class="com.example.android.apis.app.FragmentLayout$TitlesFragment"
              android:id="@+id/article_fragment"
              android:layout_weight="2"
              android:layout_width="0dp"
              android:layout_height="match_parent" />

    </FrameLayout>
</LinearLayout>

2:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <fragment android:class="com.example.android.apis.app.FragmentLayout$TitlesFragment"
              android:id="@+id/article_fragment"
              android:layout_weight="2"
              android:layout_width="0dp"
              android:layout_height="match_parent" />

</LinearLayout>

i know that based on this article the FrameLayout is:

designed to block out an area on the screen to display a single item

so i want to know that is there any different in their outputs appearance???

Upvotes: 1

Views: 86

Answers (2)

Laurent Meyer
Laurent Meyer

Reputation: 2881

There is basically no difference, you're just adding a level of abstraction to your view.

The output will be exactly the same, but with the first solution, you'll be able to add some overlapping views over your fragment (because a FrameLayout is basically a stack of views (your quote about FrameLayout is not exact btw, you can add lots of elements in this layout)).

In the second option, you'll only have the possibility to add some views before or after your fragment (horizontally or vertically depending on the orientation of the LinearLayout you're using)

The FrameLayout is very cool to make overlapping views, it is even written in your article (I'm a big fan of this method):

You can, however, add multiple children to a FrameLayout and control their position within the FrameLayout by assigning gravity to each child, using the android:layout_gravity attribute.

Upvotes: 1

Rick Sanchez
Rick Sanchez

Reputation: 4766

Both of you ways are the same thing, though the FrameLayout is redundant.

FrameLayout is as you said designed to block out an area on the screen to display a single item. And so, it's usually used in this way: 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id = "@+id/fragmentContainer"
        android:layout_width="match_parent" 
        android:layout_height="match_parent" />

</LinearLayout>

so that later in runtime, you can replace it with a fragment of your choosing, like in this example: 

MyFragment myFragment = MyFragment.newInstance();
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.fragmentContainer, myFragment ); 
ft.commit();

Upvotes: 1

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