AWS Amplify를 이용한 Android 앱 개발 실습 – 1부

classpath 'com.amazonaws:aws-android-sdk-appsync-gradle-plugin:2.6.+'

apply plugin: 'com.android.application'
apply plugin: 'com.amazonaws.appsync'
android {
    // ... typical items
}
dependencies {
    // ... typical dependencies

    implementation 'com.amazonaws:aws-android-sdk-appsync:2.6.+'
    implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0'
    implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'
}

<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

        <!--other code-->

    <application
        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">

        <service android:name="org.eclipse.paho.android.service.MqttService" />

        <!--other code-->
    </application>

npm install -g @aws-amplify/cli -update

amplify init

amplify add api

type Pet @model {
  id: ID!
  name: String!
  description: String
}

amplify push

// Mobile Client for initializing the SDK   
implementation('com.amazonaws:aws-android-sdk-mobile-client:2.8.+@aar') { transitive = true }     
// Cognito UserPools for SignIn    
implementation('com.amazonaws:aws-android-sdk-auth-userpools:2.8.+@aar') { transitive = true }     
// Sign in UI Library    
implementation('com.amazonaws:aws-android-sdk-auth-ui:2.8.+@aar') { transitive = true }

public class AuthenticationActivity extends AppCompatActivity {

    private final String TAG = AuthenticationActivity.class.getSimpleName();
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_authentication);

        AWSMobileClient.getInstance().initialize(getApplicationContext(), new Callback<UserStateDetails>() {

            @Override
            public void onResult(UserStateDetails userStateDetails) {
                Log.i(TAG, userStateDetails.getUserState().toString());
                switch (userStateDetails.getUserState()){
                    case SIGNED_IN:
                        Intent i = new Intent(AuthenticationActivity.this, MainActivity.class);
                        startActivity(i);
                        break;
                    case SIGNED_OUT:
                        showSignIn();
                        break;
                    default:
                        AWSMobileClient.getInstance().signOut();
                        showSignIn();
                        break;
                }
            }

            @Override
            public void onError(Exception e) {
                Log.e(TAG, e.toString());
            }
        });
    }

    private void showSignIn() {
        try {
            AWSMobileClient.getInstance().showSignIn(this,
                 SignInUIOptions.builder().nextActivity(MainActivity.class).build());
        } catch (Exception e) {
            Log.e(TAG, e.toString());
        }
    }
}

<!-- ... Other Code... -->
<activity
    android:name=".MainActivity"
    android:label="@string/app_name">
</activity>
<activity
    android:name=".AuthenticationActivity"
    android:noHistory="true">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <include layout="@layout/content_main" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_dialog_email" />

</android.support.design.widget.CoordinatorLayout>

public class MainActivity extends AppCompatActivity {
    @Override
     protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
     }
}

public class ClientFactory {
    private static volatile AWSAppSyncClient client;

    public static synchronized void init(final Context context) {
        if (client == null) {
            final AWSConfiguration awsConfiguration = new AWSConfiguration(context);
            client = AWSAppSyncClient.builder()
                     .context(context)
                     .awsConfiguration(awsConfiguration)
                     .cognitoUserPoolsAuthProvider(new CognitoUserPoolsAuthProvider() {
                        @Override
                        public String getLatestAuthToken() {
                            try {
                                return AWSMobileClient.getInstance().getTokens().getIdToken().getTokenString();
                            } catch (Exception e){
                                Log.e("APPSYNC_ERROR", e.getLocalizedMessage());
                                return e.getLocalizedMessage();
                            }
                         }
                     }).build();
         }
    }

    public static synchronized AWSAppSyncClient appSyncClient() {
        return client;
    }
}

<android.support.v7.widget.RecyclerView
            android:id="@+id/recycler_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="10dp">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:paddingLeft="10dp"
        android:textSize="15dp"
        android:id="@+id/txt_name"
        />
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:paddingLeft="10dp"
        android:textSize="15dp"
        android:id="@+id/txt_description"
        />

</LinearLayout>

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {

    private List<ListPetsQuery.Item> mData = new ArrayList<>();;
    private LayoutInflater mInflater;


    // data is passed into the constructor
    MyAdapter(Context context) {
        this.mInflater = LayoutInflater.from(context);
    }

    // inflates the row layout from xml when needed
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = mInflater.inflate(R.layout.recyclerview_row, parent, false);
        return new ViewHolder(view);
    }

    // binds the data to the TextView in each row
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        holder.bindData(mData.get(position));
    }

    // total number of rows
    @Override
    public int getItemCount() {
        return mData.size();
    }

    // resets the list with a new set of data
    public void setItems(List<ListPetsQuery.Item> items) {
        mData = items;
    }

    // stores and recycles views as they are scrolled off screen
    class ViewHolder extends RecyclerView.ViewHolder {
        TextView txt_name;
        TextView txt_description;

        ViewHolder(View itemView) {
            super(itemView);
            txt_name = itemView.findViewById(R.id.txt_name);
            txt_description = itemView.findViewById(R.id.txt_description);
        }

        void bindData(ListPetsQuery.Item item) {
            txt_name.setText(item.name());
            txt_description.setText(item.description());
        }
    }
}

public class MainActivity extends AppCompatActivity {

    RecyclerView mRecyclerView;
    MyAdapter mAdapter;

    private ArrayList<ListPetsQuery.Item> mPets;
    private final String TAG = MainActivity.class.getSimpleName();

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mRecyclerView = findViewById(R.id.recycler_view);

        // use a linear layout manager
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

        // specify an adapter (see also next example)
        mAdapter = new MyAdapter(this);
        mRecyclerView.setAdapter(mAdapter);

        ClientFactory.init(this);
    }

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

        // Query list data when we return to the screen
        query();
    }

    public void query(){
        ClientFactory.appSyncClient().query(ListPetsQuery.builder().build())
                .responseFetcher(AppSyncResponseFetchers.CACHE_AND_NETWORK)
                .enqueue(queryCallback);
    }

    private GraphQLCall.Callback<ListPetsQuery.Data> queryCallback = new GraphQLCall.Callback<ListPetsQuery.Data>() {
        @Override
        public void onResponse(@Nonnull Response<ListPetsQuery.Data> response) {

            mPets = new ArrayList<>(response.data().listPets().items());

            Log.i(TAG, "Retrieved list items: " + mPets.toString());

            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    mAdapter.setItems(mPets);
                    mAdapter.notifyDataSetChanged();
                }
            });
        }

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_margin="15dp">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Name"
        android:textSize="15sp"
        />
    <EditText
        android:id="@+id/editTxt_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Description"
        android:textSize="15sp" />
    <EditText
        android:id="@+id/editText_description"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/btn_save"
        android:layout_marginTop="15dp"
        android:text="Save"/>
</LinearLayout>

public class AddPetActivity extends AppCompatActivity {
    private static final String TAG = AddPetActivity.class.getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_pet);

        Button btnAddItem = findViewById(R.id.btn_save);
        btnAddItem.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                save();
            }
        });
    }

    private void save() {
        final String name = ((EditText) findViewById(R.id.editTxt_name)).getText().toString();
        final String description = ((EditText) findViewById(R.id.editText_description)).getText().toString();

        CreatePetInput input = CreatePetInput.builder()
                .name(name)
                .description(description)
                .build();

        CreatePetMutation addPetMutation = CreatePetMutation.builder()
                .input(input)
                .build();
        ClientFactory.appSyncClient().mutate(addPetMutation).enqueue(mutateCallback);
    }

    // Mutation callback code
    private GraphQLCall.Callback<CreatePetMutation.Data> mutateCallback = new GraphQLCall.Callback<CreatePetMutation.Data>() {
        @Override
        public void onResponse(@Nonnull final Response<CreatePetMutation.Data> response) {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(AddPetActivity.this, "Added pet", Toast.LENGTH_SHORT).show();
                    AddPetActivity.this.finish();
                }
            });
        }

        @Override
        public void onFailure(@Nonnull final ApolloException e) {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Log.e("", "Failed to perform AddPetMutation", e);
                    Toast.makeText(AddPetActivity.this, "Failed to add pet", Toast.LENGTH_SHORT).show();
                    AddPetActivity.this.finish();
                }
            });
        }
    };
}

<android.support.design.widget.FloatingActionButton
        android:id="@+id/btn_addPet"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|right|end"
        android:layout_margin="16dp"
        android:tint="@android:color/white"
        app:srcCompat="@android:drawable/ic_input_add"/>

protected void onCreate(Bundle savedInstanceState) {
    //... Other code....

    FloatingActionButton btnAddPet = findViewById(R.id.btn_addPet);
      btnAddPet.setOnClickListener(new View.OnClickListener() {

          @Override
          public void onClick(View view) {
              Intent addPetIntent = new Intent(MainActivity.this, AddPetActivity.class);
              MainActivity.this.startActivity(addPetIntent);
          }
    });
}