Question

我了解如何在Android上使用约束布局，但是我第二次面对此问题，希望了解是否有补救措施或它是否有错误。我已经在布局中正确设置了所有约束，如这张照片所示，预览显示出来了

相应的xml如下所示

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
        android:id="@+id/root_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".ui.auth.PlaceOfDeliveryFragment">


    <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar_select_city"
            style="@style/ToolbarStyle"
            android:layout_width="0dp"
            android:layout_height="56dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:navigationIcon="@drawable/ic_chevron_left_white_32dp"
            app:title="@string/text_select_delivery_city"
            app:titleMarginStart="75dp"
            app:titleTextAppearance="@style/ToolbarStyle"
            app:titleTextColor="@color/colorTextWhite" />

    <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout"
            style="@style/TextInputLayoutStyle"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="24dp"
            android:layout_marginEnd="16dp"
            android:hint="@string/city"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/country_spinner">

        <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/city_text_input"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="textCapWords" />
    </com.google.android.material.textfield.TextInputLayout>

    <Spinner
            android:id="@+id/country_spinner"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:entries="@array/countries"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView" />

    <TextView
            android:id="@+id/textView"
            style="@style/TextAppearance.AppCompat.Subhead"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="32dp"
            android:text="@string/country_hint"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/toolbar_select_city" />

    <com.google.android.material.button.MaterialButton
            android:id="@+id/button_next"
            style="@style/NoInsetsButton"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:text="@string/next_txt"
            android:textAlignment="textEnd"
            app:icon="@drawable/ic_chevron_right_white_24dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toStartOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

但是当应用程序运行时，当我将其约束到布局底部时，我看到按钮挂起了。

我想了解我是否缺少任何东西，并且按钮挂了。

ConstraintLayout不遵守约束

0 个答案: