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所以我在
想要改善这个问题吗?更新问题,以便将其作为on-topic用于堆栈溢出。
上个月关闭。
Improve this question
所以我在
EditText
中有一个简单的ConstraintLayout
。我想要的是让用户开始键入内容,并扩展EditText
使其适合他们的输入,这可以按预期工作,直到我添加提示为止。然后, View 似乎被限制为提示的宽度,而输入则完全没有变化。<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<androidx.appcompat.widget.Toolbar
android:id="@+id/add_menu_item_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toTopOf="parent"
app:title="@string/add_menu_item_title" />
<EditText
android:inputType="textCapWords"
android:id="@+id/add_menu_item_name"
style="@style/BlockListItem"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/margin"
android:layout_marginTop="@dimen/margin"
android:layout_marginEnd="@dimen/margin"
android:textColorHint="@android:color/darker_gray"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/add_menu_item_toolbar" />
<View
android:id="@+id/add_menu_item_stock_frame"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="@dimen/margin"
android:layout_marginTop="@dimen/margin"
android:layout_marginEnd="@dimen/margin"
android:background="@drawable/frame_border"
app:layout_constraintBottom_toBottomOf="@id/add_menu_item_frame_margin"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/add_menu_item_name" />
<LinearLayout
android:id="@+id/add_menu_item_stock_container"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/margin"
android:orientation="vertical"
app:layout_constraintEnd_toEndOf="@id/add_menu_item_stock_frame"
app:layout_constraintStart_toStartOf="@id/add_menu_item_stock_frame"
app:layout_constraintTop_toTopOf="@id/add_menu_item_stock_frame" />
<com.google.android.material.button.MaterialButton
android:id="@+id/add_menu_item_add_stock"
style="@style/Widget.MaterialComponents.Button.TextButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/margin"
android:layout_marginEnd="@dimen/margin"
android:text="@string/add_menu_item_add_stock"
app:icon="@drawable/baseline_add_24"
app:layout_constraintBottom_toBottomOf="@id/add_menu_item_stock_frame"
app:layout_constraintEnd_toEndOf="@id/add_menu_item_stock_frame"
app:layout_constraintTop_toBottomOf="@id/add_menu_item_stock_container" />
<Space
android:id="@+id/add_menu_item_frame_margin"
android:layout_width="match_parent"
android:layout_height="@dimen/margin"
app:layout_constraintTop_toBottomOf="@id/add_menu_item_add_stock" />
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/add_menu_item_price_container"
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/margin"
android:layout_marginTop="@dimen/margin"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/add_menu_item_stock_frame"
app:layout_goneMarginTop="@dimen/margin">
<com.google.android.material.textfield.TextInputEditText
android:id="@+id/add_menu_item_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="6"
android:hint="@string/menu_add_price_hint"
android:inputType="numberDecimal" />
</com.google.android.material.textfield.TextInputLayout>
<TextView
android:id="@+id/add_menu_item_suggested_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="@dimen/margin"
app:layout_constraintBottom_toBottomOf="@id/add_menu_item_price_container"
app:layout_constraintStart_toEndOf="@id/add_menu_item_price_container"
app:layout_constraintTop_toTopOf="@id/add_menu_item_price_container" />
<com.google.android.material.button.MaterialButton
android:id="@+id/add_menu_item_add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="@dimen/margin"
android:text="@string/menu_add_add"
app:layout_constraintBottom_toBottomOf="@id/add_menu_item_price_container"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@id/add_menu_item_price_container" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
最佳答案
只要您在edittext中有一个字符串,就可以简单地删除并重置提示:
add_menu_item_name.addTextChangedListener(object : TextWatcher {
val hintText = "myHint"
override fun afterTextChanged(s: Editable?) {}
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
add_menu_item_name.hint =
if (count == 0) hintText
else null
}
}
)