layout_gravity not working in horizontal linear layout

问题

I have been trying to use layout_gravity in a horizontal linear layout. But it doesn't seem to work. I don't want to use a relative layout or any other layout. I want to know why it is not working with linear layout.I have earlier used layout_gravity in vertical linear layouts and it has worked in the way I expected.

<LinearLayout
    android:id="@+id/shata"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    >
    <TextView
        android:id="@+id/title_textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:textColor="@color/black"
        android:text="shata1"
        android:textAppearance="?android:attr/textAppearanceMedium"
        />
    <TextView
        android:id="@+id/map_imageview"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="right"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="shata2"/>    
</LinearLayout>

As you can see the the linear layout has a orientation=horizontal and width=match_parent(it is just inside the root layout). But both the TextViews are displayed sticking to the left of the LinearLayouteven though I have given their layout_gravity=center and layout_gravity=right respectively.

回答1:

Short answer: If you have a horizontal LinearLayout, then each child can only have layout_gravity values of top, bottom, and center.

The reason for this is because you've already told the LinearLayout to align each child horizontally, left-to-right in the order you specify, which means that it only lets you specify the vertical alignment of each child in the layout_gravity parameter, and the opposite applies when your LinearLayout is vertical.

There's a good link explaining how the various gravities work here.

回答2:

As an addition to Matt Taylor's response, you can specify the size ratio of the elements inside the layout using the layout_weight property. See this thread for more details.

The code above will split the horizontal space in three equals areas.

<LinearLayout
    android:id="@+id/shata"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">
    <TextView
        android:layout_width="0"
        android:layout_height="match_parent"
        android:layout_weight="1"/>
    <TextView
        android:layout_width="0"
        android:layout_height="match_parent"
        android:layout_weight="1"/>
    <TextView
        android:layout_width="0"
        android:layout_height="match_parent"
        android:layout_weight="1"/>    
</LinearLayout>

So in this example

• the first element looks like layout_gravity="left"
• the second element looks like layout_gravity="center"
• the third element looks like layout_gravity="right"

回答3:

you can divide layout to 3 part then in right part put "shata2" in center part put "shata1" and left part put a transparent view.

<LinearLayout
    android:id="@+id/shata"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <View
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        />

    <TextView
        android:id="@+id/title_textview"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_gravity="center|top"
        android:layout_weight="1"
        android:text="shata1"
        android:gravity="center"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textColor="#111" />

    <TextView
        android:id="@+id/map_imageview"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_gravity="right"
        android:gravity="right"
        android:text="shata2"
        android:textAppearance="?android:attr/textAppearanceMedium" />



</LinearLayout>

but in your code when you use linear layout it just put views one after other and it doesnt care the layout gravity. hope it be useful .

回答4:

If you want to have your child view centered then you just need to give your linear layout gravity for the children. On your linear layout set the following:

android:gravity="center"

I hope I got your question right.

回答5:

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal">
<TextView
    style="@style/Base.TextAppearance.AppCompat.Headline"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="Blankets &amp;  Carpets" />

<ListView
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/list_home_feature"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="30dp"
    android:layout_marginRight="10dp">

</ListView>

</LinearLayout>

回答6:

One way for creating three childs in horizontal linearlayout would be(tested):

    <LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="horizontal"
        android:weightSum="3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <TextView
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_gravity="center_horizontal"
            android:layout_height="wrap_content"/>

            <TextView
                android:layout_weight="1"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:text="" />

来源：https://stackoverflow.com/questions/33076051/layout-gravity-not-working-in-horizontal-linear-layout