Android Studio 错误：无法解析符号 CreateTodoInput 和 CreateTodoMutation

Question

I am trying to build an Android app using AWS Amplify CLI.

I am following the AWS documentation . However, I am getting this error, in Android Studio:

Cannot resolve symbol CreateTodoInput and CreateTodoMutation

I have pasted all the dependencies as present in the documentation in my app and project Gradle files.

I found a similar question ( Can not resolve symbol CreateTodoInput ), but the answer provided doesn't resolve my issue.

My entire code is in MainActivity.java :

package com.example.testamplify;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import com.amazonaws.mobile.config.AWSConfiguration;
import com.amazonaws.mobileconnectors.appsync.AWSAppSyncClient;
import com.apollographql.apollo.GraphQLCall;
import com.apollographql.apollo.exception.ApolloException;

import javax.annotation.Nonnull;

public class MainActivity extends AppCompatActivity {
    private AWSAppSyncClient mAWSAppSyncClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mAWSAppSyncClient = AWSAppSyncClient.builder()
            .context(getApplicationContext())
            .awsConfiguration(new AWSConfiguration(getApplicationContext()))
            .build();
        runMutation();
    }

    public void runMutation() {
        CreateTodoInput createTodoInput = CreateTodoInput.builder()
            .name("Use AppSync")
            .description("Realtime and Offline")
            .build();
        mAWSAppSyncClient
            .mutate(CreateTodoMutation.builder()
                .input(createTodoInput).build()
            )
            .enqueue(mutationCallback);
    }

    private GraphQLCall.Callback<CreateTodoMutation.Data> mutationCallback =
        new GraphQLCall.Callback<CreateTodoMutation.Data>() {
            @Override
            public void onResponse(@Nonnull Response<CreateTodoMutation.Data> response) {
                Log.i("Results", "Added Todo");
            }

            @Override
            public void onFailure(@Nonnull ApolloException e) {
                Log.e("Error", e.toString());
            }
        };
}

Answer 1

将我的项目与 gradle 文件同步解决了这个问题！

Answer 2

I had the same problem as I'm new and experimenting with this too. I think CreateTodo is a type of variable. Download this example of an android app provided by AWS, found here . Open the ListEventsActivity, on line 77. You will see this same code, hope it helps you understand, it helped me.

Answer 3

Retry the tutorial again, and when you use amplify add api , after amplify push.

It'll ask the follow Do you want to generate code for your newly created GraphQL API . At first i choose no, and the folder graphql was not generated.

So, when the prompt ask

Do you want to generate code for your newly created GraphQL API

You have to answer yes and configure with the default values.

At least, that was wrong wit me, give it a try.