I have this layout:
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlayGoogleMaterialIcons">
<LinearLayout
android:layout_height="wrap_content"
android:layout_width="0dp">
...
what is the meaning of android:layout_width="0dp" not in the child of LinearLayout?
what is the meaning of android:layout_width="0dp" when there is not weight
attribute?
for the children of ConstraintLayout
if you have set constraints then the 0dp
is for match_constraint
(take full width, or full height)
Using 0dp, which is the equivalent of "MATCH_CONSTRAINT" https://developer.android.com/reference/android/support/constraint/ConstraintLayout
example
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tv_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
tools:text="text1" />
<TextView
android:id="@+id/tv_2"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toStartOf="@id/tv_3"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tv_1"
tools:text="text2" />
<TextView
android:id="@+id/tv_3"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@id/tv_2"
app:layout_constraintTop_toBottomOf="@id/tv_1"
tools:text="text3" />
</android.support.constraint.ConstraintLayout>
in the above code (and image) you see that text1
TextView
width is the width it needs to write the text text1
for text2 and text3 TextView
it takes the whole width divided by 2 that is what the constraints say
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