How to use Two-way data binding in android (kotlin)

Question

I need to enable my Button after check some condition, i want to call one method using @InverseBinding OR Two Way data binding and reflect the changes with return value.

my Code :

<Button 
      android:id="@+id/save_btn_disabled_3"
      android:enabled="@={controller}"
      ....
      />

my Two Way data binding logic here :

@InverseBindingAdapter(attribute = "enable")
    fun getEnableButton(view:View, controller:Controller): Boolean {
    //some conditions
        return false
    }

i want to know am i going in correct direction ?, code is ok ? please suggest me.

two-way data binding use for the attributes available in given link: developer.android.com/topic/libraries/data-binding/… careful not to introduce infinite loops when using two-way data binding. — Viral Patel
– Viral Patel, Commented Dec 18, 2019 at 7:46
First you check the condition if it is correct then you will enable the button and it onclick method is that it you want? — Rahul sharma
– Rahul sharma, Commented Dec 24, 2019 at 5:10

Shitul · Accepted Answer · 2021-02-16 08:16:02Z

2

First Add Button Status Object

<variable
            name="button"
            type="com.brl.test.app.vm.ButtonStatus" />

<Button 
      android:id="@+id/save_btn_disabled_3"
      bind:state_change="@{button.state}"
      ....
      />

Set your logic in buttonEnabled funtion then Enable Your Button

@BindingAdapter({"bind:state_change"})
  public static void buttonEnabled(TextView view, State state) {
     
    view.setEnabled(true);
  }

answered Feb 16, 2021 at 8:16

Shitul

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Comments

Akshay Raiyani · Accepted Answer · 2019-12-18 07:23:16Z

0

You can set one variable in field like:

<variable
    name="wantsToVisibleProgress"
    type="boolean" />

and set it in your button like this:

<Button
    android:id="@+id/constraint_select_main"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/bg_button_blue_big"
    android:enabled="@={wantsToVisibleProgress}"
    android:gravity="center"
    android:onClick="@{v -> fragment.onClick()}"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/txt_evse_one">

You can set that value like this:

binding.setWantsToVisibleProgress(true);

answered Dec 18, 2019 at 7:23

Akshay Raiyani

1,46110 silver badges24 bronze badges

1 Comment

Geet Thakur Over a year ago

Thanks for your answer, but i want to call a function, not dependent any variable.

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