Question

因此，我有一个RecycleView的布局文件，该文件具有可扩展/可折叠的视口。

单击标题将展开/折叠多余的数据。一切在编辑器中看起来都很好。但是，它将具有类似于layout_marginBottom的幻像空间。

首次加载外观

Figure 1 (First loaded appearance)

扩展

Figure 2 (Expanded)

正确合拢

Figure 3 (Collapsed correctly)

因此编辑器将仅显示ViewHolder，如图2和3所示。但是，在设备上运行时，它将首先显示图1，然后单击以展开它，它将显示图2。再次折叠它会显示图3而不是图1。它将继续显示正确的图。（2和3）。

图2中的额外内容具有共同的父级，其标头为ConstraintLayout。

无论GONE指示符如何，都会发生这种情况：以编程方式还是XML 使用activity.runOnUIThread无济于事。使用new Handler().onPostDelayed只会更糟糕，就像显示图1一样，但是在没有额外信息的情况下，拥有更多不必要的空间，与图2一样多。

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>

还有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

科特琳

在打开键盘时尝试隐藏元素时，我遇到了非常相似的问题

会发生什么情况，当您打开键盘时，将得到两种调整大小，一种是调整开口和键盘的大小，另一种是调整视图的大小。问题是第二个调整仅在另一个元素请求布局时才会发生，因此您的屏幕会非常明显地跳动两次。

打开键盘时
点击或移动另一个UI元素

我已经找到了解决方案，但是仅当Window软输入模式=调整调整大小时

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()
                }
            }
        }
    }
}

ConstraintLayout中的元素消失了，留下了幽灵空间

1 个答案: