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Since today morning I started encountering this weird issue. Android Studio layout preview panel and Design view was not displaying some of my layouts which were perfectly fine until I updated Android Studio from 3.0.1 to 3.1.

I tried following which didn't helped :

  1. Updated buildTools from 27.0.2 to 27.0.3
  2. Updated support library from 27.0.2 to 27.1.1
  3. Updated constraint layout library from 1.1.0-beta5 to 1.1.0-beta6
  4. Synced Project with Gradle files multiple times
  5. Clean and Rebuilt project multiple times
  6. Invalidated and Restarted Android Studio
  7. Closed project from File menu and reopened it (I suspected it was due to some mismanagement of layout preview cache which was not getting cleared)
  8. Finally restarted my PC

Android Studio details :

Android Studio 3.1
Build #AI-173.4670197, built on March 22, 2018
JRE: 1.8.0_152-release-1024-b02 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 8.1 6.3
Monish Kamble
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4 Answers4

10

In my case, I did build and then clicked Force Refresh Layout started showing preview

Try whether this solves your issue,

enter image description here

Sreedhu Madhu
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5

After many failed attempts and submitting it to Android Studio bug tracker and giving it an another try. I found that it was due to a missing "+".

Sample layout to demonstrate the issue

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/rightTextView"
        style="@style/Base.TextAppearance.AppCompat.Medium"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:padding="12dp"
        android:text="This is a sample TextView at Right"
        app:layout_constraintStart_toEndOf="@+id/leftTextView" />

    <TextView
        android:id="@id/leftTextView"
        style="@style/Base.TextAppearance.AppCompat.Large"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="12dp"
        android:text="Left"
        android:textColor="@color/colorAccent" />

</android.support.constraint.ConstraintLayout>

The issue was because of a missing + in leftTextView id declaration. After changing the line (line no. 18)

android:id="@id/leftTextView"

to

android:id="@+id/leftTextView"

Android Studio layout preview panel started displaying the layout.

Note : I always used to declare view ids (i.e., "@+id") only once in a layout file at its first occurrence(either declaration or reference) and there was no issue with layout preview or running the App till now

Monish Kamble
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  • Many thanks ! I was looking for that solution and it worked. How come the @id does not work?? – Mackovich Apr 09 '18 at 13:02
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    For reference, @+id adds id to the list of available ids, @id looks for the one that is already added. It seems that preview could not find the view and layout didn't display. R file is pre-compiled and generated as you code – solidogen Oct 08 '20 at 13:47
1

For Android Studio 3.1 Gradle version, with plugin version 28.0.0, add implementation 'com.android.support:appcompat-v7:28.0.0-alpha1' instead of implementation 'com.android.support:appcompat-v7:28.0.0-rc01'.

Zoe
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Niraj Bhat
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0

My trouble was in NDK - just update it and clean + rebuild project.

Artem Winokurov
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