Android Databinding default variable value

Question

I have this layout.

<data>
    <import type="android.view.View" />
    <variable
        name="shouldBeVisible"
        type="java.lang.Boolean" />
</data>

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

    <CheckBox
        android:id="@+id/checkbox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:checked="@={shouldBeVisible}" />

    <LinearLayout
        android:layout_width="40dp"
        android:layout_height="30dp"
        android:background="#dd0"
        android:visibility="@{shouldBeVisible ? View.VISIBLE : View.GONE}" />

</LinearLayout>

shouldBeVisible is by default false. Is there a way to make shouldBeVisible true? I want to have LinearLayout visible in this one case.

So far I'm using binding.shouldBeVisible=true

James · Accepted Answer · 2021-08-26 00:32:13Z

19

To solve that error you can use several ways:

You can use primitive boolean type with inverted logic (shouldBeVisible -> shouldBeHidden)
Second way is to use boxed Boolean type (as you have now) and set default value in expressions
Third way - manually set it after inflating of binding (as you already do now)

binding.shouldBeVisible=true
Use default keyword in databining value

Choose the one best fits your needs.

edited Aug 26, 2021 at 0:32

James

5,1542 gold badges32 silver badges33 bronze badges

answered Nov 13, 2018 at 11:14

ConstOrVar

2,0851 gold badge13 silver badges17 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

ConstOrVar Over a year ago

Try to use 4-th approach

Filipkowicz Over a year ago

4th doesn't compile at all. "@{shouldBeVisible ? View.VISIBLE : View.GONE, default=gone}" works in preview/editor but not on runtime

Ponomarenko Oleh Over a year ago

Try to set the default value in this way: android:visibility='@{isLastRow ? View.VISIBLE : View.GONE, default=visible}' visible/gone/invisible Instead of View.VISIBLE... I found the solution here: stackoverflow.com/a/50296729/6799504

Collectives™ on Stack Overflow

Android Databinding default variable value

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related