Android studio ошибка design editor is unavailable until after a successful project sync

The error «ERROR: Module ‘app’: platform ‘android-28’ not found» is a common issue faced by Android developers. It occurs when the Android Studio is unable to locate the platform version that the project was built for. In addition, the design editor might also be unavailable, indicating that there is an issue with the project sync. Here are a few methods to resolve this issue:

Method 1: Update Android Studio

To fix the error «Module ‘app’: platform ‘android-28’ not found» and enable the design editor in Android Studio, you can update your Android Studio to the latest version. Here are the steps to update Android Studio:

1. Open Android Studio and click on «Help» in the top menu.
2. Select «Check for Updates» from the dropdown menu.
3. Android Studio will check for available updates. If an update is available, click on «Download» to start the update process.
4. Once the download is complete, click on «Update and Restart» to install the update.
5. Android Studio will restart after the update is installed.

After updating Android Studio, you may need to update your project’s build.gradle file to use the latest version of the Android SDK. Here’s an example of how to update the build.gradle file:

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.example.myapp"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"
    }
    ...
}

In this example, the compileSdkVersion and targetSdkVersion have been updated to 30, which is the latest version of the Android SDK at the time of writing. The buildToolsVersion has also been updated to «30.0.3».

Once you’ve updated your build.gradle file, sync your project with Gradle by clicking on the «Sync Project with Gradle Files» button in the toolbar.

After syncing your project, the error «Module ‘app’: platform ‘android-28’ not found» should be resolved and the design editor should be available.

Method 2: Update Android Gradle Plugin

To fix the error «ERROR: Module ‘app’: platform ‘android-28’ not found. Design editor is unavailable until after a successful project sync» in Android Studio, you can update the Android Gradle Plugin. Here are the steps to do so:

1. Open your project in Android Studio.
2. In the toolbar, click on «File» and select «Project Structure».
3. In the left-hand menu, select «Project».
4. Under «Project SDK», select «Android API 28 Platform».
5. In the left-hand menu, select «Modules».
6. Under «Properties», select «Compile Sdk Version» and set it to «Android API 28 Platform».
7. Under «Properties», select «Build Tools Version» and set it to «28.0.3».
8. Click «OK» to save the changes.
9. In your project’s build.gradle file, update the «com.android.tools.build:gradle» version to «3.4.2» (or a later version).
10. Sync your project with Gradle.

android {
    compileSdkVersion 28
    buildToolsVersion "28.0.3"

    defaultConfig {
        applicationId "com.example.myapp"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.2'
    }
}

To fix the error «Module ‘app’: platform ‘android-28’ not found» and make the Design editor available, you can update the Build Tools version. Follow these steps:

1. Open your project in Android Studio.
2. In the «Project» view, go to the «Gradle Scripts» folder and open the file «build.gradle (Module: app)».
3. Look for the line that says «compileSdkVersion 28» and make sure it matches the version you have installed. If not, change it to the correct version.
4. Look for the line that says «buildToolsVersion ‘28.0.3’» and change the version to the latest one available.
5. Sync your project by clicking on the «Sync Now» button that appears at the top of the screen.

Here is an example of how your «build.gradle (Module: app)» file should look like after the changes:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.myapp"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    buildToolsVersion '29.0.2'
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

Note: Make sure you have the latest Build Tools version installed in your SDK Manager. You can check for updates and install them from there.

Method 4: Check for compatibility issues

To fix the «Module ‘app’: platform ‘android-28’ not found» error and enable the Design editor, you can use Android Studio’s «Check for compatibility issues» feature. This feature checks your project’s dependencies and suggests updates to ensure compatibility with your target SDK version.

Here are the steps to use this feature:

1. Open your Android project in Android Studio.
2. Click on the «Gradle» tab on the right side of the window.
3. Expand your project’s root folder and double-click on the «app» module.
4. In the «Tasks» section, expand «android» and double-click on «dependencies».
5. Wait for the Gradle build to finish, then click on the «Report» tab at the bottom of the window.
6. Click on the «Check for compatibility issues» button.
7. Wait for the compatibility check to finish. If any issues are found, they will be listed in the «Compatibility Issues» section.
8. Review the suggested updates and click on «Apply Changes» to update your project’s dependencies.
9. Wait for the Gradle build to finish, then sync your project by clicking on the «Sync Now» button in the toolbar.

Here is an example of how to use this feature in your build.gradle file:

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.myapp"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
    }
    // Add the following block to enable the "Check for compatibility issues" feature
    lintOptions {
        checkReleaseBuilds false
        // Enable compatibility checks
        checkDependencies true
        // Set the target SDK version
        compatibilitySdkVersion 28
    }
}

This block enables the «Check for compatibility issues» feature and sets the target SDK version to 28. You can customize the lintOptions block to suit your needs.

In conclusion, using Android Studio’s «Check for compatibility issues» feature is an easy way to fix the «Module ‘app’: platform ‘android-28’ not found» error and ensure compatibility with your target SDK version.

Method 5: Re-download missing platforms and components

To fix the error «Module ‘app’: platform ‘android-28’ not found» and enable the Design editor in Android Studio, you can try re-downloading the missing platforms and components. Here are the steps to do so:

1. Open your Android Studio project.
2. In the «Project» pane on the left, select the «Gradle Scripts» folder and then open the «build.gradle (Module: app)» file.
3. Look for the following line of code:

1. Change it to:

Note: You can also use any other version of the Android SDK that you have installed on your machine.

1. Save the changes to the file and then click on the «Sync Now» button that appears in the toolbar at the top of the screen. This will trigger a project sync and download any missing platforms and components.

2. Once the sync is complete, you should be able to use the Design editor again and the error should be resolved.

Here is an example of what your updated build.gradle file might look like:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.example.myapp"
        minSdkVersion 21
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

Note: Your dependencies may be different depending on your project setup.

That’s it! This should fix the «Module ‘app’: platform ‘android-28’ not found» error and enable the Design editor in Android Studio.

Method 6: Invalidate caches and restart

To fix the error «Module ‘app’: platform ‘android-28’ not found» and enable the Design editor in Android Studio, you can try using the «Invalidate caches and restart» option. Here are the steps:

1. Close Android Studio.
2. Delete the .idea folder and the .iml files in your project directory.
3. Open your project again in Android Studio.
4. Go to «File» > «Invalidate Caches / Restart».
5. In the pop-up window, click on «Invalidate and Restart».

After Android Studio restarts, it will rebuild the project and download any missing dependencies. You should be able to use the Design editor again.

If you still encounter the same error, you can try updating your Android SDK to include the missing platform. To do this, open the SDK Manager in Android Studio and install the platform that matches the version specified in your project’s build.gradle file.

Here’s an example of how to update your build.gradle file to use a different platform version:

android {
    compileSdkVersion 29
    defaultConfig {
        ...
        minSdkVersion 21
        targetSdkVersion 29
        ...
    }
    ...
}

In this example, we’ve updated the compileSdkVersion and targetSdkVersion to 29, which requires the corresponding platform to be installed in the SDK Manager.

Remember to sync your project after making changes to the build.gradle file. You can do this by clicking on the «Sync Now» button in the toolbar or by going to «File» > «Sync Project with Gradle Files».