Design editor is unavailable until after a successful project sync как исправить

I started to learn Android Studio. I try to echo out simple «Hello World»:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    android:id="@+id/activity_main"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
    android:paddingBottom="16dp"
    tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

</RelativeLayout>

but when I clicked «design» view, this error is showing?

Design editor is unavailable until a successful build

How can I fix this error.

I just noticed that my xml code is causing error. Is that why this may be not working?

Go to File > Sync Project with Gradles Files.

None of the above worked for me. what worked for me is to go to File -> Invalidate Caches / Restart

I faced same issue even after rebuilding my project multiple times successfully. I closed the project and re-opened, issue resolved.

Simply restart the Android Studio. In my case, I was offline before starting the Android Studio, but online when I did restart.

Install missing plataform and sync project

I got this problem after i added a line in my build.gradle file.

compile 'com.balysv:material-ripple:1.0.2'

Solution:
I changed this line to

implementation 'com.balysv:material-ripple:1.0.2'

and then pressed sync again.

Tada! all was working again.

answered Apr 1, 2018 at 11:26

answered Nov 3, 2018 at 13:58

just click file in your android studio
then click Sync Project with Gradle Files..

if it won’t work,
click Build
click Clean Project.

it always work for me

answered Jul 16, 2019 at 4:26

The Android SDK Platform API Level that the project requires for targetSdkVersion may not exist.

Check the console of the Event Log tab of the IDE to see any errors eg. of the following type:

Gradle sync failed:
com.android.tools.idea.gradle.project.sync.idea.issues.SdkPlatformNotFoundException:
Module: 'common' platform 'android-29' not found.

Then install some API Level (29) in SDK Manager -> SDK Platforms and finally Sync again.

answered May 5, 2021 at 13:18

answered Nov 15, 2017 at 9:58

I have the latest Android Studio 3.6.1 and yet couldn’t build a simple ‘Hello World’ app as documented here «https://codelabs.developers.google.com/codelabs/android-training-hello-world/index.html?index=..%2F..%2Fandroid-training#3».
I applied various steps discussed above including the 2 most viable options which should have really solved this issue,

1. ‘File->Sync Project with Gradle Files‘ and
2. ‘File->Invalidate Caches/Restart‘ but to no avail.

Even though, I suspect standard answer should be one of these 2 options only for most, but for me the resolution came only after I went inside the ‘File->Project Structure’ and checked my SDK versions configured!
Android Studio and Gradle were using different JDK versions and locations.

• Android Studio: C:Program FilesJavajdk1.8.0_241
• Gradle: C:Program FilesJavajdk-13.0.2

I had previously defined my JAVA_HOME environment variable by downloading latest JAVA SDK on my own from ORACLE website. Where Gradle was using the %JAVA_HOME% JAVA SDK version and Android Studio the built in SDK which came along with Android Studio.

Once I switched both to versions JDK 1.8.* (Any version as long as it is JDK 1.8. for that matter*) then simple ‘File->Synch…’ option worked perfectly fine for me!

Good luck the solution is in between one of these 2 options only if you are stuck, just ensure you validate JDK versions being referred to!

answered Mar 8, 2020 at 20:10

there are different solutions to this problem but I at the first u have to check to (build.gradle) maybe it empty. this especially if u downloaded code, not u created
and u will find just this line «// Top-level build file where you can add configuration options common to all sub-projects/modules.»
in this case, u need to open a new project and make copy-paste.then check the SDK and other settings.finally u have to sync

answered Apr 17, 2020 at 13:32

If you are in corporate setting where there is a proxy server, double check your proxy settings.

1. Go File -> Settings
2. Search for Proxy.
3. Fill out as appropreate.
4. Test connection.

If you think you fat-fingered the password, there is a Clear passwords button you can click to where you can re-enter your creds. HTH

answered May 12, 2020 at 17:58