Android linearLayout 子项不会扩展以填充父项

Question

I have the following as a layout of mine:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MyActivity">

    <EditText
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="@drawable/bubble_b"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <RatingBar
        android:id="@+id/rating"
        style="?android:attr/ratingBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:numStars="5"
        android:rating="4"
        android:stepSize="0.5"
        android:layout_weight="1"/>

This makes my edittext and ratingbar be pushed up to the top and both of the heights are just 'wrap_content'. I have tried with RelativeLayouts as well and all that happens is the EditText takes up the entire screen and pushes the ratingbar off the screen.

Why are the layout weights not working as expected? If edittext weight is 3 and the ratingbar is 1 I would assume the edittext would take 75% of the screen, and so forth?

The background is a 9patch image so it should have no problem expanding either.

Thank you

Answer 1

I believe you want something like this

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="EditText"
        android:ems="10"
        android:id="@+id/editText"
        android:layout_weight="0.53" />

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0.53">

    <RatingBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:id="@+id/ratingBar"/>

    </RelativeLayout>
</LinearLayout>

Answer 2

Change LinearLayout's

android:layout_height="wrap_content"

to

android:layout_height="match_parent".

Also, instead of setting "0dp" to EditText and RatingBar set it to match_parent .

[Update]

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MyActivity">

<EditText
    android:id="@+id/text1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:textAppearance="?android:attr/textAppearanceMedium" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"

    android:gravity="center"
    android:layout_weight="1">

    <RatingBar
        android:id="@+id/rating"
        style="?android:attr/ratingBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:numStars="5"
        android:rating="4"
        android:stepSize="1" />
</LinearLayout>
</LinearLayout>

Answer 3

use Relative Layout to center object:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MyActivity">

    <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

        <EditText
        android:id="@+id/text1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/bubble_b"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_centerInParent="true" />


        </RelativeLayout>

       <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

        <RatingBar
        android:id="@+id/rating"
        style="?android:attr/ratingBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:numStars="5"
        android:rating="4"
        android:stepSize="0.5"
        android:layout_weight="1"/>

        </RelativeLayout>