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This is my layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:layout_marginLeft="5dip" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:textColor="#ffffff" >
</TextView>
</LinearLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/LinearLayout3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/nazajGumb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="@string/roaming_backbtn" >
</Button>
<Button
android:id="@+id/homeBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="@string/roaming_homebtn" >
</Button>
</LinearLayout>
<Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="15dip"
android:prompt="@string/roaming_spinnerPrompt" />
<TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="Random text"
android:textColor="#ffffcc" />
<Button
android:id="@+id/testBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="test" >
</Button>
</LinearLayout>
The positioning of ImageView and TextView in LinearLayout2 and positiong of buttons in LinearLayout3 is not working (using layout gravity).
What am i missing here?
688
The layout_gravity attribute can be used to position the Button as a whole with the Button text centered in side it. The gravity attribute can be used to position the text inside the Button. See the screenshot below showing the use of the layout_gravity attribute and the gravity attribute for the Button widget.
So in general android:layout_gravity attribute is used by child views to tell their parent how they want to be placed inside it, while android:gravity is used by the parent layout to tell the child views how they should be placed inside it.
gravity doesn't work well on a RelativeLayout but can be useful with a LinearLayout. It sets the gravity of the View or Layout relative to its parent. The layout_gravity does not work for views in a RelativeLayout. It is used for views in a LinearLayout or FrameLayout.
Most of what can be achieved in LinearLayout and RelativeLayout can be done in ConstraintLayout. However, learning the basics of LinearLayout and RelativeLayout is important before trying to understand how to use it with ConstraintLayout.
That's not the way in which android:layout_gravity works. Both, left and center_horizontal parameters work only when the android:orientation is vertical. To achieve what you want, you better use RelativeLayout:
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_marginLeft="5dip"/>
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_centerHorizontal="true"
android:textColor="#ffffff"/>
</RelativeLayout>
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