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How to get result of two mutablelivedata into one


How to get result of two mutablelivedata into one

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How to get result of two mutablelivedata into one
Tag : android , By : Kenny
Date : November 25 2020, 12:01 PM

I wish this helpful for you Use another 2 boolean variables that keep track of whether both LiveData has returned true.
private val _correctData = MediatorLiveData<Boolean>().apply {
        var weightFlag = false
        var ageFlag = false
        value = false
        addSource(age) { x -> x?.let { 
                            ageFlag = x > 0 
                            if (weightFlag && ageFlag) {
                                value = true
                            }
                        } }
        addSource(weight) { x -> x?.let { 
                            weightFlag = x > 0 
                            if (weightFlag && ageFlag) {
                                value = true
                            }
                        } }
    }


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Why does LiveData better than MutableLiveData?


Tag : android , By : vitorcoliveira
Date : March 29 2020, 07:55 AM
Does that help It's a practice designed to restrict modification of the value from outside the class.
LiveData is read-only. MutableLiveData, as the name implies, allows one to change the value it holds.

Using Livedata and having a problem with displaying MutableLiveData<Float> result


Tag : java , By : jaime
Date : March 29 2020, 07:55 AM
I hope this helps you . I am just testing ViewModel and LiveData of Android Architechture Components. I have this basic Activity with one EditText to receive a number from the user and when clicking the Convert button then the Textview should give the result multipled by 0.87. For example when I put 100 in EditText and click Convert button it should give the result of 87. But when I click the Convert button the Textview gives the value of "android.arch.lifecycle.MutableLiveData@eb84a7b". And when I rotate the screen then the result becomes 87. Could you please have a look at my code and tell me where I should revise the code so that the result gives the number when I click Convert button? , Use getValue() instead of toString()
mTextView.setText(mViewModel.getResult().getValue());

Add List to MutableLiveData


Tag : android , By : Terrence Poon
Date : March 29 2020, 07:55 AM
seems to work fine I have a MutableLiveData and I want to add a List inside, but seems the below code doesn't work: , Make your variable like this:
private var factsLive: MutableLiveData<List<Fact>> = MutableLiveData<>()

MutableLiveData<String> to MutableLiveData<Int>


Tag : android , By : obijywk
Date : March 29 2020, 07:55 AM
it fixes the issue How could I convert MutableLiveData< String> to MutableLiveData< Int>. , You should use Transformations.map to get a intLiveData.
val intLiveData = Transformations.map(textLiveData) {
    try {
        it.toInt()
    } catch (e: NumberFormatException) {
        0
    }
}
intLiveData.observe(lifecycleOwner,  Observer{ intValue ->
    // get the int value.
})

NullPointerException when trying to use MutableLiveData value


Tag : android , By : AJacques
Date : March 29 2020, 07:55 AM
this one helps. This is my ViewModel , You must init LiveData properties:
class ManualInputViewModel : ViewModel() {
    var username = MutableLiveData<String>()
    var password = MutableLiveData<String>()

    fun onClickLogin(view: View){
        view.context.toast(username.value)
    }
 }
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