[Résolu] Utiliser "wrap_content" et "match_parent"

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout android:layout_width="match_parent" 
                  android:id="@+id/linearLayout1"  
                  android:gravity="center"
                  android:layout_height="50dp">
        <ImageView android:id="@+id/imageView1" 
                   android:layout_height="wrap_content"
                   android:layout_width="wrap_content"
                   android:src="@drawable/logo"
                   android:paddingRight="30dp"
                   android:layout_gravity="left"
                   android:layout_weight="0" />
        <View android:layout_height="wrap_content" 
              android:id="@+id/view1"
              android:layout_width="wrap_content"
              android:layout_weight="1" />
        <Button android:id="@+id/categorybutton"
                android:background="@drawable/button_bg"
                android:layout_height="match_parent"
                android:layout_weight="0"
                android:layout_width="120dp"
                style="@style/CategoryButtonStyle"/>
    </LinearLayout>

    <fragment android:id="@+id/headlines" 
              android:layout_height="fill_parent"
              android:name="com.example.android.newsreader.HeadlinesFragment"
              android:layout_width="match_parent" />
</LinearLayout>