Question

我在ConstraintLayout内有一个ScrollView，这是我的布局的根视图。我希望ScrollView在设备的高度小于布局所需的高度时立即开始滚动。

我的布局xml是：

<?xml version="1.0" encoding="utf-8"?>
<ScrollView android:layout_width="match_parent"
android:layout_height="match_parent"
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"
tools:context="com.clickagee.babybind.AccountSettingActivity"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true"
android:fillViewport="true">

<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/tv_account_title"
        style="@style/textXLargePurple"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="@dimen/margin_padding_size_medium"
        android:text="@string/account"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_add_partner"
        style="@style/button"
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:layout_marginEnd="@dimen/margin_padding_size_medium"
        android:background="@drawable/custom_button_purple_outline"
        android:paddingEnd="@dimen/margin_padding_size_medium"
        android:paddingStart="@dimen/margin_padding_size_medium"
        android:text="@string/add_partner"
        android:textColor="@color/colorAccent"
        app:layout_constraintBottom_toBottomOf="@id/tv_account_title"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@id/tv_account_title" />


    <LinearLayout
        android:id="@+id/ll_upload_change_photo_pane"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/margin_padding_size_large"
        android:orientation="vertical"
        app:layout_constraintEnd_toStartOf="parent"
        app:layout_constraintStart_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@id/btn_add_partner">

        <de.hdodenhof.circleimageview.CircleImageView
            android:id="@+id/civ_change_upload_photo"
            android:layout_width="130dp"
            android:layout_height="130dp"
            android:src="@drawable/ic_upload_user_image" />

        <TextView
            android:id="@+id/tv_upload_change_photo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:text="@string/upload_photo" />

    </LinearLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/til_user_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/margin_padding_size_medium"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="@dimen/margin_padding_size_medium"
        app:layout_constraintTop_toBottomOf="@id/ll_upload_change_photo_pane">

        <android.support.design.widget.TextInputEditText
            android:id="@+id/et_user_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/name_hint"
            android:inputType="textCapWords"
            android:lines="1"
            android:maxLines="1"
            android:singleLine="true"
            android:paddingBottom="@dimen/margin_padding_size_medium"/>

    </android.support.design.widget.TextInputLayout>

    <TextView
        android:id="@+id/tv_gender_account_setting"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="@dimen/margin_padding_size_small"
        android:text="@string/gender"
        android:textColor="@color/light_grey"
        android:textSize="@dimen/text_size_small"
        app:layout_constraintTop_toBottomOf="@id/til_user_name" />

    <RadioGroup
        android:id="@+id/rg_user_gender"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/margin_padding_size_medium"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="@dimen/margin_padding_size_small"
        android:orientation="horizontal"
        android:weightSum="3"
        app:layout_constraintTop_toBottomOf="@id/tv_gender_account_setting">

        <RadioButton
            android:id="@+id/rb_user_male_account_settings"
            style="@style/textLarge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="@dimen/margin_padding_size_medium"
            android:layout_weight="1"
            android:background="@drawable/rbtn_selector"
            android:button="@drawable/custom_radio_button_male"
            android:padding="@dimen/margin_padding_size_small"
            android:paddingEnd="@dimen/margin_padding_size_medium"
            android:text="@string/male"
            android:ellipsize="end"
            android:maxLines="1"
            android:textColor="@color/radio_button_text_colors" />

        <RadioButton
            android:id="@+id/rb_user_female_account_settings"
            style="@style/textLarge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="@dimen/margin_padding_size_medium"
            android:layout_weight="1"
            android:background="@drawable/rbtn_selector"
            android:button="@drawable/custom_radio_button_female"
            android:padding="@dimen/margin_padding_size_small"
            android:paddingEnd="@dimen/margin_padding_size_medium"
            android:text="@string/female"
            android:ellipsize="end"
            android:maxLines="1"
            android:textColor="@color/radio_button_text_colors" />

        <RadioButton
            android:id="@+id/rb_user_other_account_settings"
            style="@style/textLarge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@drawable/rbtn_selector"
            android:button="@drawable/custom_radio_button_other"
            android:padding="@dimen/margin_padding_size_small"
            android:paddingEnd="@dimen/margin_padding_size_medium"
            android:text="@string/other"
            android:ellipsize="end"
            android:maxLines="1"
            android:textColor="@color/radio_button_text_colors" />

    </RadioGroup>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/til_user_phone_number"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/margin_padding_size_medium"
        app:layout_constraintTop_toBottomOf="@id/rg_user_gender">

        <android.support.design.widget.TextInputEditText
            android:id="@+id/et_user_phone_number"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="@dimen/margin_padding_size_medium"
            android:layout_marginStart="@dimen/margin_padding_size_medium"
            android:hint="@string/phone_number_hint"
            android:inputType="phone"
            android:lines="1"
            android:maxLines="1"
            android:singleLine="true"
            android:paddingBottom="@dimen/margin_padding_size_medium"/>

    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@+id/til_user_email"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/margin_padding_size_medium"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="@dimen/margin_padding_size_medium"
        app:layout_constraintTop_toBottomOf="@id/til_user_phone_number">

        <android.support.design.widget.TextInputEditText
            android:id="@+id/et_user_email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/email_hint"
            android:inputType="textEmailAddress"
            android:lines="1"
            android:maxLines="1"
            android:singleLine="true"
            android:paddingBottom="@dimen/margin_padding_size_medium"/>

    </android.support.design.widget.TextInputLayout>

    <LinearLayout
        android:id="@+id/btn_save_details_ll"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginEnd="@dimen/margin_padding_size_medium"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="@dimen/margin_padding_size_large"
        android:gravity="center"
        android:orientation="horizontal"
        app:layout_constraintTop_toBottomOf="@id/til_user_email">
          <br.com.simplepass.loading_button_lib.customViews.CircularProgressButton
            android:id="@+id/btn_save_details"
            style="@style/button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/custom_button"
            android:padding="@dimen/margin_padding_size_small"
            android:text="@string/save_details"
            android:textColor="@color/white"
            app:spinning_bar_color="@color/white"
            app:spinning_bar_padding="@dimen/spinning_bar_padding"
            app:spinning_bar_width="@dimen/spinning_bar_width" />

    </LinearLayout>

    <Button
        android:id="@+id/btn_cancel_account_settings"
        style="@style/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/margin_padding_size_medium"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="16dp"
        android:background="@drawable/custom_button_purple_outline"
        android:padding="@dimen/margin_padding_size_small"
        android:text="@string/cancel"
        android:textColor="@color/colorAccent"
        app:layout_constraintTop_toBottomOf="@id/btn_save_details_ll"
        android:layout_marginBottom="@dimen/margin_padding_size_small"/>

    </android.support.constraint.ConstraintLayout>

</ScrollView>

但是无论是否需要的高度小于或等于我，我都会滚动。

此异常行为的屏幕截图为

以下不应该发生，我在这里错过了什么吗？：

Answer 1

您在layout_constraintBottom_toBottomOf="parent"上缺少了btn_cancel_account_settings

<Button
        android:id="@+id/btn_cancel_account_settings"
        style="@style/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginEnd="@dimen/margin_padding_size_medium"
        android:layout_marginStart="@dimen/margin_padding_size_medium"
        android:layout_marginTop="16dp"
        android:background="@drawable/custom_button_purple_outline"
        android:padding="@dimen/margin_padding_size_small"
        android:text="@string/cancel"
        android:textColor="@color/colorAccent"
        app:layout_constraintTop_toBottomOf="@id/btn_save_details_ll"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginBottom="@dimen/margin_padding_size_small"/>

Answer 2

更改

unique_ptr

Answer 3

这是因为您的文本输入字段具有默认焦点。放弃输入文本字段的焦点，并添加以下属性：app:layout_constraintBottom_toBottomOf="parent"到btn_cancel_account_settings。

ScrollView根目录内的ConstraintLayout无法正常工作

3 个答案: