在列表视图中完整显示列表

Question

我在 ConstraintLayout 中有一个列表视图，它必须显示我的所有列表都已满，并使约束布局更大。我发现的所有选项都不适用于我的情况。

我试图不完全显示列表视图的所有这些选项，每个选项都会留下一半或更多的项目来滚动

这是我的 xml：

<android.support.constraint.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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorPrimary">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fillViewport="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

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

            <android.support.constraint.ConstraintLayout
                android:id="@+id/question_content_container"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="14dp"
                android:layout_marginTop="59dp"
                android:layout_marginEnd="14dp"
                android:layout_marginBottom="22dp"
                android:background="@color/white"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="1.0"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.0">

                ...

                <ListView
                    android:id="@+id/answers_list"
                    android:layout_width="0dp"
                    android:layout_height="wrap_content"
                    android:layout_marginStart="12dp"
                    android:layout_marginTop="18dp"
                    android:layout_marginEnd="12dp"
                    android:footerDividersEnabled="false"
                    android:layout_marginBottom="7dp"
                    android:divider="@drawable/divider"
                    android:scrollbars="none"
                    android:transcriptMode="alwaysScroll"
                    app:layout_constraintBottom_toBottomOf="parent"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toBottomOf="@+id/question_tv"
                    app:layout_constraintVertical_bias="0.0" />

                ...

            </android.support.constraint.ConstraintLayout>

           ...

        </android.support.constraint.ConstraintLayout>
    </ScrollView>
</android.support.constraint.ConstraintLayout>

我已经试过了：

public static boolean setListViewHeightBasedOnItems(ListView listView) {
    ListAdapter listAdapter = listView.getAdapter();
    if (listAdapter != null) {
        int numberOfItems = listAdapter.getCount();
        // Get total height of all items.
        int totalItemsHeight = 0;
        for (int itemPos = 0; itemPos < numberOfItems; itemPos++) {
            View item = listAdapter.getView(itemPos, null, listView);
            item.measure(0, 0);
            totalItemsHeight += item.getMeasuredHeight();
        }
        // Get total height of all item dividers.
        int totalDividersHeight = listView.getDividerHeight() *
                (numberOfItems - 1);
        // Set list height.
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = totalItemsHeight + totalDividersHeight;
        listView.setLayoutParams(params);
        listView.requestLayout();
        return true;
    } else {
        return false;
    }

和

public void setListViewHeightBasedOnChildren(ListView listView) {
        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter == null)
            return;
        int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(), View.MeasureSpec.UNSPECIFIED);
        int totalHeight = 0;
        View view = null;
        int itemCount = listAdapter.getCount();
        for (int i = 0; i <= itemCount; i++) {
            view = listAdapter.getView(i, view, listView);
            if (i == 0)
                view.setLayoutParams(new ViewGroup.LayoutParams(desiredWidth, ViewGroup.LayoutParams.WRAP_CONTENT));
            view.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED );
            totalHeight += view.getMeasuredHeight();
        }
        ViewGroup.LayoutParams params = listView.getLayoutParams();
        params.height = (totalHeight + (listView.getDividerHeight() * (itemCount - 1)));
        listView.setLayoutParams(params);
        listView.requestLayout();
    }

Answer 1

让我拥有一个列表视图并能够滚动浏览它的方法是将滚动视图作为父视图，并在滚动视图内部设置约束布局。

Answer 2

就我而言，我发现的唯一解决方案是将 ListView 与 RecylerView 交换；