java - ConstraintLayout 中的消失元素留下幽灵空间

Question

所以我有一个 RecycleView 的布局文件，它具有可展开/可折叠的 View 。

点击标题会展开/折叠额外的数据。在编辑器中一切看起来都很好。但是，它会有一个类似于 layout_marginBottom 的幽灵空间。

首次加载外观

展开

正确折叠

因此编辑器只会显示 ViewHolder，如图 2 和图 3 所示。但是在设备上运行时，会先显示图1，点击展开后会显示图2，再次折叠会显示图3，而不是图1，会继续显示正确​​的数字(2 和 3)。

图 2 中的额外内容具有共同的父级，其标题是 ConstraintLayout。

无论 GONE 说明符如何，这都会发生:以编程方式或 XML使用 activity.runOnUIThread 无济于事。使用 new Handler().onPostDelayed 只会比显示图 1 更糟，但会有更多不需要的空间，与图 2 一样多，只是没有额外信息。

这是 XML 文件:

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView 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="wrap_content"
android:layout_marginBottom="10dp"
app:cardCornerRadius="10dp">

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

    <LinearLayout
        android:id="@+id/header"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:padding="10dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/validity"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0">

        <ImageButton
            android:id="@+id/expand"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="@android:color/transparent"
            android:layout_marginRight="8dp"
            android:layout_marginEnd="8dp"
            app:srcCompat="@drawable/ic_right" />

        <TextView
            android:id="@+id/title"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:ellipsize="end"
            android:maxLines="1"
            android:textColor="@color/textDark" />
    </LinearLayout>

    <View
        android:id="@+id/divider"
        android:layout_width="0dp"
        android:layout_height="2dp"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="16dp"
        android:background="@color/colorSecondaryDark"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/header" />

    <TextView
        android:id="@+id/date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="10dp"
        android:layout_marginTop="8dp"
        app:layout_constraintEnd_toStartOf="@+id/size"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/divider" />

    <TextView
        android:id="@+id/size"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginTop="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/divider" />

    <TextView
        android:id="@+id/amount"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="10dp"
        android:layout_marginTop="8dp"
        app:layout_constraintEnd_toStartOf="@+id/validity"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/date" />

    <LinearLayout
        android:id="@+id/validity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginTop="8dp"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/size">

        <ImageView
            android:id="@+id/help"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="8dp"
            android:layout_marginRight="8dp"
            android:layout_weight="1"
            android:contentDescription="@string/backup_layout_help_desc"
            app:srcCompat="@drawable/ic_help" />

        <TextView
            android:id="@+id/invalid"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="@string/backup_layout_invalid"
            android:textAllCaps="true"
            android:textColor="@color/red" />
    </LinearLayout>

    <TextView
        android:id="@+id/passwords"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:layout_marginStart="10dp"
        android:layout_marginTop="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/amount" />

    <Button
        android:id="@+id/delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="8dp"
        android:layout_marginStart="10dp"
        android:layout_marginTop="10dp"
        android:background="@android:color/transparent"
        android:text="@string/backup_layout_delete"
        android:textColor="@color/red"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toStartOf="@+id/importshare"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/passwords"
        app:layout_constraintVertical_bias="1.0" />

    <LinearLayout
        android:id="@+id/importshare"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginTop="10dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/validity"
        app:layout_constraintVertical_bias="1.0">

        <Button
            android:id="@+id/commit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:text="Import"
            android:textColor="@color/yellow" />

        <ImageButton
            android:id="@+id/share"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="@android:color/transparent"
            android:contentDescription="Share"
            android:padding="10dp"
            app:srcCompat="@drawable/ic_share" />
    </LinearLayout>

</android.support.constraint.ConstraintLayout>

和 ViewHolder(剪切以显示相关部分):

public ViewHolder(View itemView, Context context) {
        super(itemView);

        Amount = itemView.findViewById(R.id.amount);
        Date = itemView.findViewById(R.id.date);
        Delete = itemView.findViewById(R.id.delete);
        Divider = itemView.findViewById(R.id.divider);
        ExpandCollapse = itemView.findViewById(R.id.expand);
        Import = itemView.findViewById(R.id.commit);
        ImportShare = itemView.findViewById(R.id.importshare);
        Header = itemView.findViewById(R.id.header);
        Help = itemView.findViewById(R.id.help);
        Passwords = itemView.findViewById(R.id.passwords);
        Share = itemView.findViewById(R.id.share);
        Size = itemView.findViewById(R.id.size);
        Title = itemView.findViewById(R.id.title);
        Validity = itemView.findViewById(R.id.validity);

        Title.setTypeface(Typeface.createFromAsset(context.getAssets(), "cera.otf"));

        Header.setOnClickListener(this);

        onClick(Header);

    }

    @Override
    public void onClick(View v) {
        if (expanded) collapse();
        else expand();
    }

    public void expand() {
        ExpandCollapse.animate().rotation(90).start();

        Date.setVisibility(View.VISIBLE);
        Size.setVisibility(View.VISIBLE);
        Amount.setVisibility(View.VISIBLE);
        Passwords.setVisibility(View.VISIBLE);
        Divider.setVisibility(View.VISIBLE);
        Validity.setVisibility(valid ? View.INVISIBLE : View.VISIBLE);

        Delete.setVisibility(View.VISIBLE);
        ImportShare.setVisibility(View.VISIBLE);

        expanded = true;
    }

    public void collapse() {
        ExpandCollapse.animate().rotation(0).start();

        Date.setVisibility(View.GONE);
        Size.setVisibility(View.GONE);
        Amount.setVisibility(View.GONE);
        Passwords.setVisibility(View.GONE);
        Divider.setVisibility(View.GONE);
        Validity.setVisibility(View.GONE);

        Delete.setVisibility(View.GONE);
        ImportShare.setVisibility(View.GONE);

        expanded = false;
    }

Answer 1

Kotlin

在键盘打开时尝试隐藏元素时，我遇到了非常相似的问题

当您打开键盘时会发生什么情况，您会得到两次调整大小，一次是针对打开和键盘的调整，另一次是将 View 设置为消失。问题是第二次调整只会在另一个元素请求布局时发生，因此您的屏幕会非常明显地跳动两次

1. 键盘打开时
2. 当您点击或移动另一个 UI 元素时

我已经找到了一个解决方案，但只有当 Window 软输入模式 = 调整调整大小时才可以

见下文

class MainActivity : AppCompatActivity() {
    private var activityHeight = 0
    private var keyboardOpen = false
    private var mainScreen : ConstraintLayout? = null
    private var infoText : TextView? = null
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_screen)

        mainScreen = findViewById(R.id.mainConstraintLayout)
        infoText = findViewById(R.id.mainInfoText)

        //...

        /* Capture initial screen size */
        this@MainActivity.window.decorView.doOnNextLayout {
            val displayFrame : Rect = Rect()
            this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(displayFrame)
            activityHeight = displayFrame.height()
        }

        /* Check for keyboard open/close */
        this@MainActivity.window.decorView.addOnLayoutChangeListener { v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom ->
            val drawFrame : Rect = Rect()
            this@MainActivity.window.decorView.getWindowVisibleDisplayFrame(drawFrame)
            val currentSize = drawFrame.height()
            if(keyboardOpen){
                keyboardOpen = currentSize < activityHeight
                if (!keyboardOpen){
                    infoText?.visibility = View.VISIBLE
                }
            }else {
                keyboardOpen = currentSize < activityHeight
                if(keyboardOpen) {
                    infoText?.visibility = View.GONE
                    /* Request a new layout on your base layout so screen adjusts correctly */
                    mainScreen?.requestLayout()
                }
            }
        }
    }
}