[Solved] Android studio layout become blank when i enter text into multiline text

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Your EditText doesn’t have an id name and you’re missing the “d” in the unit “dp” of the width attribute. Also when you constrain it you mustn’t include the + symbol in the id name of the other view. + is used for new views, not for referencing existing views. Make these changes and you should be fine!

Edit: If you add your xml code, I can pinpoint the specific changes, but I can’t do that if you’re only sharing the images

Edit 2:
When you’re using Left-to-Right layouts it’s redundant to have margin left and margin start, or margin right and margin end, as they’re the same thing. I wasn’t breaking you’re layout but I removed that. Also, I wrapped the height to the contents of your textview.

<?xml version="1.0" encoding="utf-8"?>
<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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:text="TextView"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/edittext"
        android:layout_width="215dp"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="8dp"
        android:autofillHints=""
        android:ems="10"
        android:inputType="textMultiLine"
        android:scrollbarSize="8dp"
        android:scrollbars="horizontal|vertical"
        app:layout_constraintBottom_toTopOf="@id/button2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/textView"
        app:layout_constraintTop_toBottomOf="@id/textView"
        tools:ignore="HardcodedText"
        tools:targetApi="o" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="16dp"
        android:layout_marginEnd="16dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="12dp"
        android:text="OK"
        app:layout_constraintBaseline_toBaselineOf="@id/button2"
        app:layout_constraintEnd_toStartOf="@id/button2" />

</android.support.constraint.ConstraintLayout>

It doesn’t fail for me now. If it still does for you, chances are you’re giving the same names to textviews of other layouts (each view should have a unique name, as everything is stored in the same R file).

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solved Android studio layout become blank when i enter text into multiline text