android - 为什么当我将 Constraintlayout 放在 Scrollview 中时，它的高度会增加？

Question

我有一个 ConstraintLayout，无需滚动即可显示智能手机上的所有项目。不过，我想用 ScrollView 包围 ConstraintLayout，让手机较小的用户可以滚动。

添加 ScrollView 时，即使在我的智能手机上，我也需要滚动到最后一个按钮。ConstraintLayout 的高度增加，id="@+id/button3" 和 id="@+id/button4" 的两个按钮出现在一个大的空白区域之后。

  <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
>


<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/linearLayout3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<Button
    android:id="@+id/button3"
    android:layout_width="150dp"
    android:layout_height="50dp"
    android:layout_marginStart="10dp"
    android:layout_marginBottom="16dp"
    android:drawableLeft="@drawable/ic_chevron_left_black_24dp"
    android:onClick="zurueckZuMainActivity"
    android:text="Zurück"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintStart_toStartOf="parent" />

<Button
    android:id="@+id/button4"
    android:layout_width="150dp"
    android:layout_height="50dp"
    android:layout_marginEnd="10dp"
    android:layout_marginBottom="16dp"
    android:drawableRight="@drawable/ic_chevron_right_black_24dp"
    android:onClick="weiter"
    android:text="Weiter"
    app:layout_constraintBottom_toBottomOf="parent"

    app:layout_constraintEnd_toEndOf="parent" />

<TextView
    android:id="@+id/textView6"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginTop="16dp"
    android:text="Bestellformular"
    android:textAppearance="@style/TextAppearance.AppCompat.Large"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/textView7"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginTop="10dp"
    android:text="Schritt 1/4: Lieferadresse"
    android:textAppearance="@style/TextAppearance.AppCompat.Medium"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView6" />

<ImageView
    android:id="@+id/imageView9"
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:layout_marginStart="10dp"
    android:layout_marginTop="16dp"
    android:layout_marginEnd="10dp"
    app:layout_constraintBottom_toBottomOf="@+id/textInputLayout_vorname"
    app:layout_constraintEnd_toStartOf="@+id/textInputLayout_vorname"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="@+id/textInputLayout_vorname"
    app:layout_constraintVertical_bias="0.523"
    app:srcCompat="@drawable/ic_person_black_24dp" />


<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_vorname"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="30dp"
    android:layout_marginEnd="10dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/imageView9"
    app:layout_constraintTop_toBottomOf="@+id/textView7"


    >

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/vorname_edit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Vorname"
        android:inputType="textCapWords"


        />
</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_nachname"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="9dp"
    android:layout_marginEnd="10dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="@+id/textInputLayout_vorname"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_vorname">

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

<ImageView
    android:id="@+id/imageView11"
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:layout_marginStart="10dp"
    android:layout_marginEnd="10dp"
    android:layout_marginBottom="20dp"
    app:layout_constraintBottom_toTopOf="@+id/textInputLayout_strasse"
    app:layout_constraintEnd_toStartOf="@+id/textInputLayout_telefonnummer"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/imageView9"
    app:layout_constraintVertical_bias="0.587"
    app:srcCompat="@drawable/ic_phone_black_24dp" />

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_telefonnummer"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="36dp"
    android:layout_marginEnd="10dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/imageView11"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_nachname">

    <com.google.android.material.textfield.TextInputEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Telefonnummer"
        android:id="@+id/telefonnummer_edit"
        android:inputType="number"
        />
</com.google.android.material.textfield.TextInputLayout>

<ImageView
    android:id="@+id/imageView12"
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:layout_marginStart="10dp"
    android:layout_marginTop="16dp"
    android:layout_marginEnd="10dp"
    android:layout_marginBottom="4dp"
    app:layout_constraintBottom_toBottomOf="@+id/textInputLayout_email"
    app:layout_constraintEnd_toStartOf="@+id/textInputLayout_email"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_telefonnummer"
    app:layout_constraintVertical_bias="1.0"
    app:srcCompat="@drawable/ic_email_black_24dp" />

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_email"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:layout_marginEnd="10dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/imageView12"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_telefonnummer">

    <com.google.android.material.textfield.TextInputEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="E-Mail-Adresse"
        android:id="@+id/email_edit"

        />
</com.google.android.material.textfield.TextInputLayout>

<ImageView
    android:id="@+id/imageView13"
    android:layout_width="35dp"
    android:layout_height="35dp"
    android:layout_marginStart="10dp"
    android:layout_marginTop="300dp"
    android:layout_marginEnd="10dp"
    android:layout_marginBottom="248dp"
    app:layout_constraintBottom_toTopOf="@+id/button3"
    app:layout_constraintEnd_toStartOf="@+id/textInputLayout_strasse"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_vorname"
    app:layout_constraintVertical_bias="0.361"
    app:srcCompat="@drawable/ic_location_on_black_24dp" />


<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_strasse"
    android:layout_width="0dp"
    android:layout_height="53dp"
    android:layout_marginTop="36dp"
    android:layout_marginEnd="7dp"
    android:layout_marginBottom="23dp"
    app:layout_constraintBottom_toTopOf="@+id/textInputLayout_stadt"
    app:layout_constraintEnd_toStartOf="@+id/textInputLayout_nummer"
    app:layout_constraintStart_toEndOf="@+id/imageView13"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_email"
    app:layout_constraintVertical_bias="0.13">

    <com.google.android.material.textfield.TextInputEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Straße"
        android:inputType="textCapWords"

        android:id="@+id/strasse_edit"

        />
</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_nummer"
    android:layout_width="152dp"
    android:layout_height="53dp"
    android:layout_marginTop="34dp"
    android:layout_marginEnd="10dp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/textInputLayout_strasse"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_email">

    <com.google.android.material.textfield.TextInputEditText
        android:id="@+id/nummer_edit"
        android:layout_width="163dp"
        android:layout_height="wrap_content"
        android:hint="Nummer"


        />
</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_plz"
    android:layout_width="108dp"
    android:layout_height="56dp"
    android:layout_marginStart="55dp"
    android:layout_marginTop="7dp"
    android:layout_marginEnd="12dp"
    app:layout_constraintEnd_toStartOf="@+id/textInputLayout_stadt"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_strasse">

    <com.google.android.material.textfield.TextInputEditText
        android:layout_width="106dp"
        android:layout_height="44dp"
        android:hint="PLZ"
        android:id="@+id/plz_edit"
        android:inputType="number"

        />
</com.google.android.material.textfield.TextInputLayout>

<com.google.android.material.textfield.TextInputLayout
    android:id="@+id/textInputLayout_stadt"
    android:layout_width="0dp"
    android:layout_height="56dp"
    android:layout_marginTop="7dp"
    android:layout_marginEnd="10dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/textInputLayout_plz"
    app:layout_constraintTop_toBottomOf="@+id/textInputLayout_nummer"
    app:layout_constraintVertical_bias="0.0">

    <com.google.android.material.textfield.TextInputEditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Stadt"
        android:id="@+id/stadt_edit"
        android:inputType="textCapWords"


        />
    </com.google.android.material.textfield.TextInputLayout>

    <TextView
    android:id="@+id/textView4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="16dp"
    android:layout_marginTop="10dp"
    android:layout_marginBottom="1dp"
    android:text="Füllen Sie bitte alle nachfolgenden Felder aus! "
    app:layout_constraintBottom_toTopOf="@+id/textInputLayout_vorname"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView7" />
    </androidx.constraintlayout.widget.ConstraintLayout>

我该如何解决这个问题？

Answer 1

yu 使用了 fillviewport="true" 如果视口中有额外空间可用，它基本上会增加滚动视图的高度以使用剩余空间。如果您将其设为 false，则视口的高度将与您预期的一样。

Answer 2

试着把你的包裹Buttons在他们自己的ConstraintLayout里面linearLayout3

<androidx.constraintlayout.widget.ConstraintLayout
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintBottom_toBottomOf="parent"
    android:layout_width="match_parent"
    android:layout_height="0dp">
    <Button
        android:id="@+id/button4"
        android:layout_width="150dp"
        android:layout_height="50dp"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="16dp"
        android:onClick="weiter"
        android:text="Weiter"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"  />

    <Button
        android:id="@+id/button3"
        android:layout_width="150dp"
        android:layout_height="50dp"
        android:layout_marginStart="10dp"
        android:layout_marginBottom="16dp"
        android:onClick="zurueckZuMainActivity"
        android:text="Zurück"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 3

你可以尝试添加一个RelativeLayout：

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/linearLayout3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:id="@+id/textView6"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="16dp"
            android:text="Bestellformular"
            android:textAppearance="@style/TextAppearance.AppCompat.Large"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/textView7"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="10dp"
            android:text="Schritt 1/4: Lieferadresse"
            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView6" />

        <ImageView
            android:id="@+id/imageView9"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginStart="10dp"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="10dp"
            app:layout_constraintBottom_toBottomOf="@+id/textInputLayout_vorname"
            app:layout_constraintEnd_toStartOf="@+id/textInputLayout_vorname"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/textInputLayout_vorname"
            app:layout_constraintVertical_bias="0.523"
            />


        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_vorname"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:layout_marginEnd="10dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView9"
            app:layout_constraintTop_toBottomOf="@+id/textView7"


            >

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/vorname_edit"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Vorname"
                android:inputType="textCapWords"


                />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_nachname"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="9dp"
            android:layout_marginEnd="10dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="@+id/textInputLayout_vorname"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_vorname">

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

        <ImageView
            android:id="@+id/imageView11"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginStart="10dp"
            android:layout_marginEnd="10dp"
            android:layout_marginBottom="20dp"
            app:layout_constraintBottom_toTopOf="@+id/textInputLayout_strasse"
            app:layout_constraintEnd_toStartOf="@+id/textInputLayout_telefonnummer"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageView9"
            app:layout_constraintVertical_bias="0.587"
            />

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_telefonnummer"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="36dp"
            android:layout_marginEnd="10dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView11"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_nachname">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Telefonnummer"
                android:id="@+id/telefonnummer_edit"
                android:inputType="number"
                />
        </com.google.android.material.textfield.TextInputLayout>

        <ImageView
            android:id="@+id/imageView12"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginStart="10dp"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="10dp"
            android:layout_marginBottom="4dp"
            app:layout_constraintBottom_toBottomOf="@+id/textInputLayout_email"
            app:layout_constraintEnd_toStartOf="@+id/textInputLayout_email"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_telefonnummer"
            app:layout_constraintVertical_bias="1.0"
            />

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_email"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="10dp"
            android:layout_marginEnd="10dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/imageView12"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_telefonnummer">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="E-Mail-Adresse"
                android:id="@+id/email_edit"

                />
        </com.google.android.material.textfield.TextInputLayout>

        <ImageView
            android:id="@+id/imageView13"
            android:layout_width="35dp"
            android:layout_height="35dp"
            android:layout_marginStart="10dp"
            android:layout_marginTop="300dp"
            android:layout_marginEnd="10dp"
            android:layout_marginBottom="248dp"
            app:layout_constraintBottom_toTopOf="@+id/button3"
            app:layout_constraintEnd_toStartOf="@+id/textInputLayout_strasse"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_vorname"
            app:layout_constraintVertical_bias="0.361"
            />


        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_strasse"
            android:layout_width="0dp"
            android:layout_height="53dp"
            android:layout_marginTop="36dp"
            android:layout_marginEnd="7dp"
            android:layout_marginBottom="23dp"
            app:layout_constraintBottom_toTopOf="@+id/textInputLayout_stadt"
            app:layout_constraintEnd_toStartOf="@+id/textInputLayout_nummer"
            app:layout_constraintStart_toEndOf="@+id/imageView13"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_email"
            app:layout_constraintVertical_bias="0.13">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Straße"
                android:inputType="textCapWords"

                android:id="@+id/strasse_edit"

                />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_nummer"
            android:layout_width="152dp"
            android:layout_height="53dp"
            android:layout_marginTop="34dp"
            android:layout_marginEnd="10dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/textInputLayout_strasse"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_email">

            <com.google.android.material.textfield.TextInputEditText
                android:id="@+id/nummer_edit"
                android:layout_width="163dp"
                android:layout_height="wrap_content"
                android:hint="Nummer"


                />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_plz"
            android:layout_width="108dp"
            android:layout_height="56dp"
            android:layout_marginStart="55dp"
            android:layout_marginTop="7dp"
            android:layout_marginEnd="12dp"
            app:layout_constraintEnd_toStartOf="@+id/textInputLayout_stadt"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_strasse">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="106dp"
                android:layout_height="44dp"
                android:hint="PLZ"
                android:id="@+id/plz_edit"
                android:inputType="number"

                />
        </com.google.android.material.textfield.TextInputLayout>

        <com.google.android.material.textfield.TextInputLayout
            android:id="@+id/textInputLayout_stadt"
            android:layout_width="0dp"
            android:layout_height="56dp"
            android:layout_marginTop="7dp"
            android:layout_marginEnd="10dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@+id/textInputLayout_plz"
            app:layout_constraintTop_toBottomOf="@+id/textInputLayout_nummer"
            app:layout_constraintVertical_bias="0.0">

            <com.google.android.material.textfield.TextInputEditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Stadt"
                android:id="@+id/stadt_edit"
                android:inputType="textCapWords"


                />
        </com.google.android.material.textfield.TextInputLayout>

        <TextView
            android:id="@+id/textView4"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="10dp"
            android:layout_marginBottom="1dp"
            android:text="Füllen Sie bitte alle nachfolgenden Felder aus! "
            app:layout_constraintBottom_toTopOf="@+id/textInputLayout_vorname"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView7" />
    </androidx.constraintlayout.widget.ConstraintLayout>

    <Button
        android:id="@+id/button3"
        android:layout_width="150dp"
        android:layout_height="50dp"
        android:layout_marginStart="10dp"
        android:layout_marginBottom="16dp"
        android:onClick="zurueckZuMainActivity"
        android:text="Zurück"
        android:layout_alignParentBottom="true"/>

    <Button
        android:id="@+id/button4"
        android:layout_width="150dp"
        android:layout_height="50dp"
        android:layout_marginEnd="10dp"
        android:layout_marginBottom="16dp"
        android:onClick="weiter"
        android:text="Weiter"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        />

</RelativeLayout>

Answer 4

如果视口中有额外的可用空间，您已经使用fillviewport="true"它基本上增加了滚动视图的高度以使用剩余空间。如果您成功了false，或者只是删除了该属性，则约束布局的高度将如您预期的那样。默认情况下， 的值为fillviewportfalse。