Ejercicio con Retrofit: Repositorios

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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="com.example.repositorios.MainActivity">

    <EditText
        android:id="@+id/editText"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_margin="16dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:text="paco-portada"
        app:layout_constraintBottom_toTopOf="@+id/coordinatorLayout"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


    <androidx.coordinatorlayout.widget.CoordinatorLayout
        android:id="@+id/coordinatorLayout"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/editText">

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recyclerView"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </androidx.recyclerview.widget.RecyclerView>

        <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom|right"
            android:layout_margin="24dp"
            android:src="@drawable/autorenew"
            app:layout_anchor="@id/recyclerView"
            app:layout_anchorGravity="bottom|right|end" />

    </androidx.coordinatorlayout.widget.CoordinatorLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

/res/values/colors.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="purple_200">#FFBB86FC</color>
    <color name="purple_500">#FF6200EE</color>
    <color name="purple_700">#FF3700B3</color>
    <color name="teal_200">#FF03DAC5</color>
    <color name="teal_700">#FF018786</color>
    <color name="black">#FF000000</color>
    <color name="white">#FFFFFFFF</color>
</resources>

item_view.xml

<?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">

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:id="@+id/textView1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:text="Name"
                android:textAppearance="@android:style/TextAppearance.Material.Large"
                android:textColor="@color/teal_700" />

            <TextView
                android:id="@+id/textView2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:text="Description"
                android:textColor="@color/purple_500" />

            <TextView
                android:id="@+id/textView3"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_margin="8dp"
                android:text="CreatedAt"
                android:textColor="@color/teal_200" />
        </LinearLayout>
    </androidx.cardview.widget.CardView>
</LinearLayout>

– Creación del RecyclerView y el adapter

Using the RecyclerView

Android – RecyclerView: Implementing single item click and long press

Interfaz ClickListener

public interface ClickListener{
    public void onClick(View view, int position);
    public void onLongClick(View view,int position);
}

ReposAdapter.java

public class ReposAdapter extends RecyclerView.Adapter<ReposAdapter.MyViewHolder> {
    public ArrayList<Repo> mRepos;

    public  ReposAdapter(){
        this.mRepos = new ArrayList<>();
    }

    public void setRepos(ArrayList<Repo> repos) {
        mRepos = repos;
        notifyDataSetChanged();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder {
        ItemViewBinding binding;//Name of the item_view.xml in camel case + "Binding"

        public MyViewHolder(ItemViewBinding b) {
            super(b.getRoot());
            binding = b;
        }
    }

    @NonNull
    @Override
    public ReposAdapter.MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new MyViewHolder(ItemViewBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull ReposAdapter.MyViewHolder holder, int position) {
        // Get the data model based on position
        Repo repo = mRepos.get(position);

        holder.binding.textView1.setText(repo.getName());
        holder.binding.textView2.setText(repo.getDescription());
        // holder.binding.textView3.setText(repo.getCreatedAt());
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd-MM-yyyy")
                                                       .withZone(ZoneId.systemDefault());
        // API 26 mínima para usar parse
        Instant instant = Instant.parse(repo.getCreatedAt());
        String output = formatter.format( instant );
        holder.binding.textView3.setText(output);
    }

    @Override
    public int getItemCount() {
        return mRepos.size();
    }
}

– Retrofit

Consuming APIs with Retrofit Cómo consumir una API y procesar la respuesta usando Retrofit Customize Network Timeouts Patrón Singleton

Define the endpoints:

ApiService.java

public interface ApiService {
    @GET("users/{username}/repos")
    Call<ArrayList<Repo>> listRepos(@Path("username") String username);

    // uso con servidor web local
    @GET("ficheros/repositorios.json")
    Call<ArrayList<Repo>> getRepos();
}

Creating the Retrofit instance:

ApiAdapter.java

public class ApiAdapter {
    private static ApiService API_SERVICE;

    public static final String BASE_URL = "https://api.github.com/";
    // android:usesCleartextTraffic="true"
    // public static final String BASE_URL = "http://192.168.0.10/";

    public static synchronized ApiService getInstance() {

        if (API_SERVICE == null) {
            OkHttpClient okHttpClient = new OkHttpClient.Builder()
                    .connectTimeout(10, TimeUnit.SECONDS)
                    .readTimeout(10, TimeUnit.SECONDS)
                    .writeTimeout(5, TimeUnit.SECONDS)
                    .build();

            Gson gson = new GsonBuilder()
                    .setDateFormat("dd-MM-yyyy")
                    .create();

            Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create(gson))
                    .client(okHttpClient)
                    .build();

            API_SERVICE = retrofit.create(ApiService.class);
        }
        return  API_SERVICE;
    }
}

Accesing the API

Call<ArrayList<Repo>> call = ApiAdapter.getInstance().listRepos(username);

call.enqueue(new Callback<ArrayList<Repo>>() {

    @Override

    public void onResponse(Call<ArrayList<Repo>> call, Response<ArrayList<Repo>> response) {

        int statusCode = response.code();

        User user = response.body();  

    }



    @Override

    public void onFailure(Call<ArrayList<Repo>> call, Throwable t) {

        // Log error here since request failed

    }

});

MainActivity.java

// https://developer.android.com/guide/topics/ui/floating-action-button
// https://material.io/components/buttons-floating-action-button/android#using-fabs
// https://material.io/resources/icons/?icon=autorenew&style=baseline
// https://stackoverflow.com/questions/25229124/format-instant-to-string
// https://stackoverflow.com/questions/19112357/java-simpledateformatyyyy-mm-ddthhmmssz-gives-timezone-as-ist
// https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/time/format/DateTimeFormatter.html
// https://www.baeldung.com/java-datetimeformatter

public class MainActivity extends AppCompatActivity implements View.OnClickListener, Callback<ArrayList<Repo>> {
    private ActivityMainBinding binding;
    private ReposAdapter adapter;
    private ArrayList<Repo> repos;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        View view = binding.getRoot();
        setContentView(view);

        binding.fab.setOnClickListener(this);

        adapter = new ReposAdapter();
        binding.recyclerView.setAdapter(adapter);
        binding.recyclerView.setLayoutManager(new LinearLayoutManager(this));

        //manage click
        binding.recyclerView.addOnItemTouchListener(new RecyclerTouchListener(this, binding.recyclerView, new ClickListener() {
            @Override
            public void onClick(View view, final int position) {
                //Values are passing to activity & to fragment as well
                //Toast.makeText(getApplicationContext(), "Single Click on position        :" + position, Toast.LENGTH_SHORT).show();
                showMessage("Single Click on position:" + position);
                //Uri uri = Uri.parse((String) repos.get(position).getUrl());
                Uri uri = Uri.parse((String) repos.get(position).getHtmlUrl());
                Intent intent = new Intent(Intent.ACTION_VIEW, uri);
                if (intent.resolveActivity(getPackageManager()) != null)
                    startActivity(intent);
                else
                    //Toast.makeText(getApplicationContext(), "No hay un navegador", Toast.LENGTH_SHORT).show();
                    showMessage("No hay un navegador");
            }

            @Override
            public void onLongClick(View view, int position) {
                //Toast.makeText(getApplicationContext(), "Long press on position :" + position, Toast.LENGTH_LONG).show();
                showMessage("Long press on position :" + position);
            }
        }));
    }

    //retrofit

    private void showMessage(String s) {
        Toast.makeText(this, s, Toast.LENGTH_SHORT).show();
    }

    public void onClick(View view) {

        if (view == binding.fab) {
            String username = binding.editText.getText().toString();
            showMessage(username);
            if (username.isEmpty())
                showMessage("Debe dar un nombre");
            else {
                // poner cuadro de progreso, si se desea
                //Call<ArrayList<Repo>> call = apiService.listRepos(username);
                Call<ArrayList<Repo>> call = ApiAdapter.getInstance().listRepos(username);
                // uso con servidor web local
                // Call<ArrayList<Repo>> call = ApiAdapter.getInstance().getRepos();
                call.enqueue((Callback<ArrayList<Repo>>) this);
            }
        }
    }

    @Override
    public void onResponse(Call<ArrayList<Repo>> call, Response<ArrayList<Repo>> response) {
        //get the data and refresh the adapter
        //and handle the wrong answer



    }

    @Override
    public void onFailure(Call<ArrayList<Repo>> call, Throwable t) {
        //handle the failure

    }
}

onResponse?

@Override
public void onResponse(Call<ArrayList<Repo>> call, Response<ArrayList<Repo>> response) {


}