当某些编辑文本具有焦点时,我正在尝试进行一些数学运算。我有 3 个编辑文本,根据哪个重点关注数学运算,其他两个编辑文本值也是如此。我在 Java 中有类似的东西,它工作正常,但在 Kotlin 上它没有输入任何所需的功能。
override fun onClick(v: View?) {
if (edtProductSuggestedPrice.hasFocus() ) {
calculateWitIVA(1)
}
if(edtProductSuggestedPriceWithIva.hasFocus()){
calculateWitIVA(2)
}
}
我怎样才能做到这一点?
答案 0 :(得分:0)
我相信您需要使用 MutableLiveData<String>
并且推荐使用双向数据绑定
例如
我的视图模型
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel
import com.yazan.talabatclonedriver.Repository
import com.yazan.talabatclonedriver.db.UserEntity
class UserViewModel(private val repository: Repository) : ViewModel() {
val userName: MutableLiveData<String> = MutableLiveData("N/A")
val phoneNum: MutableLiveData<String> = MutableLiveData("404")
val driverPass: MutableLiveData<String> = MutableLiveData("")
}
和我的布局
<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<data>
<variable
name="viewModel"
type="com.yazan.talabatclonedriver.viewModel.UserViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/orange"
tools:context=".ui.frags.SignInFrag">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginTop="30dp"
android:text="Welcome to \nTalabat Driver"
android:textColor="#FFF"
android:textSize="34sp"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="32dp"
android:layout_marginEnd="32dp"
android:src="@drawable/scooter_delivery_pic"
app:layout_constraintBottom_toTopOf="@+id/cv_login_container"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView"
tools:ignore="ContentDescription" />
<androidx.cardview.widget.CardView
android:id="@+id/cv_login_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginEnd="32dp"
android:layout_marginBottom="32dp"
app:cardElevation="20dp"
app:layout_constraintBottom_toTopOf="@+id/tv_navigate_text"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:padding="15dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="15dp"
android:text="Log into your driver account"
android:textColor="#000"
android:textSize="22sp"
android:textStyle="bold" />
<EditText
android:id="@+id/et_userName"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="15dp"
android:ems="5"
android:text="@={viewModel.userName}"
android:hint="Enter username"
android:textSize="20sp" />
<EditText
android:id="@+id/et_userPass"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="15dp"
android:ems="5"
android:text="@={viewModel.driverPass}"
android:hint="Enter password"
android:textSize="20sp" />
<Button
android:id="@+id/bt_signIn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:backgroundTint="@color/orange"
android:padding="10dp"
android:text="Continue"
android:textAllCaps="false"
android:textSize="18sp" />
</LinearLayout>
</androidx.cardview.widget.CardView>
<TextView
android:id="@+id/tv_navigate_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{viewModel.driverPass}"
android:textColor="#FFF"
android:textSize="20sp"
android:textStyle="bold"
android:layout_marginBottom="20dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>
当您更改 et_userName
编辑文本时,tv_navigate_text 应同时更改
别忘了添加
BuildFeatures{
dataBinding = true
}
到你的级别应用 Gradle