AWS Amplify for Android - Cannot resolve symbol 'AmplifyModelProvider'

Question

Good day all,

I am implementing AWS Amplify DataStore for android following the docs, and basically i get this error when i try to initialize the data store plugin on amplify according to this part of the doc:

Cannot resolve symbol 'AmplifyModelProvider'

You can find code from my gradle files and my application class below.

I am not an android expert, but i believe this is because of a missing dependency or i am doing something wrong during initialization or assignation of the ModelProvider. But i cant find any information on internet about this issue or any possible solution.

Thanks in advance for your help.

Steps to reproduce:

1. Create new android project

2. Install Amplify CLI, using npm, npm install -g @aws-amplify/cli

3. Configure amplify, amplify configure

4. On new android project root folder, run amplify init, amplify init

5. On new android project root folder, run amplify add auth, amplify add auth, adding authentication

6. Create android application class

7. Add android application class to AndroidManifest.xml

8. Try to add data store plugin to amplify on onCreate method of the application class

I already try the following solutions:

1. Clean project

2. Rebuild project

3. Run Make Project

4. Close and open again Android Studio

AndroidManifest.xml:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.bakeano.htejobs">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

MyApplication.java

package com.bakeano.htejobs;

import android.app.Application;
import android.util.Log;

import com.amazonaws.mobile.client.AWSMobileClient;
import com.amazonaws.mobile.client.Callback;
import com.amazonaws.mobile.client.UserStateDetails;
import com.amplifyframework.api.aws.AWSApiPlugin;
import com.amplifyframework.core.Amplify;
import com.amplifyframework.core.model.ModelProvider;
import com.amplifyframework.datastore.AWSDataStorePlugin;

public class MyApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        // AWSMobileClient initialization
        AWSMobileClient.getInstance().initialize(getApplicationContext(), new Callback<UserStateDetails>() {
            @Override
            public void onResult(UserStateDetails result) {
                try {
                    ModelProvider modelProvider = AmplifyModelProvider.getInstance(); // Error on this line !!!
                    Amplify.addPlugin(AWSDataStorePlugin.forModels(modelProvider));
                    Amplify.addPlugin(new AWSApiPlugin());
                    Amplify.configure(getApplicationContext());
                } catch (Exception e) {
                    Log.e("bakeanoMessage", "Amplify adding plugins Exception: " + e.getMessage(), e);
                }
            }

            @Override
            public void onError(Exception e) {
                Log.e("bakeanoMessage", "AWSMobileClient init Exception: " + e.getMessage(), e);
            }
        });
    }
}

Module Gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"

    defaultConfig {
        applicationId "com.bakeano.htejobs"
        minSdkVersion 23
        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'
        }
    }

    compileOptions {
        sourceCompatibility 1.8
        targetCompatibility 1.8
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.1.0'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    // androidx constraint layout
    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta4'

    // aws amplify framework core
    implementation 'com.amplifyframework:core:0.10.0'

    // AWSMobileClient
    implementation 'com.amazonaws:aws-android-sdk-mobile-client:2.16.11'

    // aws amplify for the drop-in ui
    implementation 'com.amazonaws:aws-android-sdk-auth-userpools:2.16.11'
    implementation 'com.amazonaws:aws-android-sdk-auth-ui:2.16.11'

    // aws amplify api
    implementation 'com.amplifyframework:aws-api:0.10.0'

    // aws amplify data store
    implementation 'com.amplifyframework:aws-datastore:0.10.0'

}

Project Gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

    repositories {
        google()
        jcenter()
        mavenCentral()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.6.2'

        // amplify tools gradle plugin
        classpath 'com.amplifyframework:amplify-tools-gradle-plugin:0.2.1'


        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

// applying the amplify tools plugin
apply plugin: 'com.amplifyframework.amplifytools'

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

Answer 1

Solution provided by Jameson Williams:

at projects github issue platform - issue #370

AmplifyModelProvider is an autogenerated file that is created by amplify codegen

amplify codegen models

after manual generation you need to import it:

import com.amplifyframework.datastore.generated.model.AmplifyModelProvider;

Thanks !!